Intertidal ecology Research Papers - Academia.edu (original) (raw)

2025, Journal of Experimental Marine Biology and Ecology

In New England, the blue mussel Mytilus edulis (Linnaeus) often lives infaunally on cabbie beaches in sheltered bays. We examined the lifestyle ofinfaunal mussels in sheltered bays and their relationship with the acorn barnacle Semibalanus balanoides (Linnaeus) living on cobbles. Results of transplant experiments with M. edulis suggest that heat stress associated with hard substrata restricts high intertidal mussels to infaunal habitats in sheltered bays. At high tidal heights, infaunal mussels are buffered from thermal stress and have higher survivorship and growth rates than epifaunal mussels on hard surfaces. Infaunal mussels bind cobbles together with byssal threads and reduce disturbance mortality to barnacles living on cobbles. Disturbance, however, was not a major source (< 10%) of barnacle mortality in the population studied. In contrast, infaunal mussel binding of cobbles and sediment was found to buffer cobbles from temperature extremes, insulating barnacles on cobbles from thermal stresses and substantially decreasing barnacle mortality on cobbles. Our work shows that the relationship between M. edulis and S. balanoides varies across habitats. Under benign thermal conditions at low intertidal heights and on wave-splashed shores, mussels outcompete barnacles for space on hard substrata. In contrast, at high tidal heights on thermally stressful cobble beaches, infauaal mussels may buffer-barnacles from thermal stress and increase barnacle survivorship. Our results support a growing body of literature which suggests that intra-and interspecific facilitation mechanisms may commonly be important in physically stressful environmen|s.

2025, Ecology

Positive interactions that result from neighbors buffering one another from stressful conditions are predictably important community forces in physically stressful habitats. Here, we examine the generality of this hypothesis in marine intertidal communities. Intertidal communities have historically played a large role in the development of community ecology since they occur across pronounced physical gradients and are easily manipulated. Positive interactions, however, have not been emphasized in studies of intertidal communities. We first review studies of intertidal marsh plant communities that suggest that positive interactions play a dominant role in the structure and dynamics of these common assemblages. We then present the results of an experimental manipulation on New England rocky shores that suggests that group benefits are as important in maintaining the upper intertidal limits of dominant spaceholders on rocky shores as the negative forces of competition and predation are in maintaining lower distributional limits. We conclude by discussing the generality and implications of our results. We argue that biogeographic biases have limited appreciation of the role played by positive interactions in intertidal communities. Most of the work that has formed the foundation of marine intertidal ecology was done in cool temperate habitats, whereas positive interactions driven by the amelioration of thermal or desiccation stresses are likely more important in warmer climates. We further argue that many important positive feedbacks operate at large spatial scales, not conducive to experimental study, and thus have escaped critical attention and general acceptance. We suggest that recognizing the role of positive interactions in communities may be key to understanding population and community processes in physically stressful habitats, many large-scale landscape processes, and uncovering long-suspected linkages between biodiversity and community stability.

2025, River Deltas Research - Recent Advances

The Jamapa River basin is located in the central region of the State of Veracruz, it is born in the Pico de Orizaba and connects with the Veracruz Reef System in the Gulf of Mexico, both protected natural areas. The lower part of the basin has the contribution of two important effluents, Arroyo Moreno, which is a protected natural area, strongly impacted due to municipal discharges from the metropolitan cities Veracruz-Boca del Río-Medellín. And the Estero, which is part of a complex aquatic system that discharges its waters from the Lagunar Mandinga system to the Gulf of Mexico. Currently, there is a diversity of chemical and biological compounds that the basin receives from different sources of freshwater pollution, such as industrial waste, sewage, agricultural and urban runoff, and the accumulation of sediments. The climatic seasons are the determining factors in the composition of its sediments, due to the force exerted on the bottom of the river by the increase in rainfall, th...

2025, Global Ecology and Biogeography

Aim To identify geographic locations where lethal temperatures and upper zonation limits of Mytilus californianus beds coincide and to determine the dominant climatic factor where lethal limits occur. Location Intertidal shores along 1500 km of the west coast of North America. Lethal temperatures for M. californianus were determined using temperature-controlled chambers in which both the magnitude and duration of exposure were manipulated. Field surveys of the shore level and solar exposure of upper zonation limits of mussel beds were conducted at 15 sites. Measurements from the lethal temperature studies and field surveys were used with a biophysical model of mussel body temperature to hindcast M. californianus mortality rates from 1997-2007. The critical lethal high body temperature was c. 38 °C. Hindcasts of mortality rates predicted that lethal temperatures occurred along the upper limits of the mussel bed at only two of the sites, Santa Cruz and Alegria, CA, USA, and daily maximum air temperature during low tide was the variable that distinguished these sites. Santa Cruz and Alegria were not adjacent to each other and not the most equatorward of the sites examined. Local upper zonation limits of the mussel M. californianus are determined by lethal high body temperatures at two of 15 locations, which means that alternative environmental factors are determining local zonation at most of the study sites. Mussel body temperature is driven by many physical variables, but air temperature was higher at Santa Cruz and Alegria than elsewhere making it the most likely factor driving the climatic sensitivity at local upper zonation limits. There was no significant evidence of local acclimation or local adaptation in this species. Some local zonation limits are more vulnerable to climate change than others, potentially causing the magnitude and timing of zonation shifts to differ even among closely situated sites.

2025, Global Change Biology

Species range boundaries are determined by a variety of factors of which climate is one of the most influential. As a result, climate change is expected to have a profound effect on organisms and ecosystems. However, the impacts of weather and climate are frequently modified by multiple nonclimatic factors. Therefore, the role of these nonclimatic factors needs to be examined in order to understand and predict future change. Marine intertidal ecosystems are exposed to heat extremes during warm, sunny, midday low tides. Thus, the timing of low tide, a nonclimatic factor, determines the potential contact intertidal invertebrates and algae have with heat extremes. We developed a method that quantifies the daily risk of high temperature extremes in the marine intertidal using solar elevations and spatially continuous tidal predictions. The frequency of 'risky days' is variable over time and space along the Pacific Coast of North America. Results show that at some sites the percentage of risky days in June can vary by 30% across years. In order to do a detailed analysis, we selected San Francisco as a study site. In San Francisco, May is the month with the greatest frequency of risky days, even though September is the month with the greatest frequency of high air temperature, ! 30 1C. These results indicate that marine intertidal organisms can be protected from high temperature extremes due to the timing of tides and local weather patterns. In addition, annual fluctuations in tides influence the frequency of intertidal zone exposures to high temperature extremes. Peaks in risk for heat extremes in the intertidal zone occur every 18 years, the length of the tidal epoch. These results suggest that nonclimatic variables can complicate predictions of shifts in species ranges due to climate change, but that mechanistic approaches can be used to produce predictions that include these factors.

2025, The American Naturalist

The body temperature of ectotherms is influenced by the interaction of abiotic conditions, morphology, and behavior. Al though organisms living in different thermal habitats may exhibit morphological plasticity or move from unfavorable locations, there are few examples of animals adjusting their thermal properties in response to short-term changes in local conditions. Here, we show that the intertidal sea star Pisaster ochraceus modulates its thermal inertia in response to prior thermal exposure. After exposure to high body temperature at low tide, sea stars increase the amount of colder than-air fluid in their coelomic cavity when submerged during high tide, resulting in a lower body temperature during the subsequent low tide. Moreover, this buffering capacity is more effective when seawater is cold during the previous high tide. This ability to modify the volume of coelomic fluid provides sea stars with a novel ther moregulatory "backup" when faced with prolonged exposure to el evated aerial temperatures.

2025

Coastal processes shape the coast into a variety of eye-catching and enticing landforms that attract people to marvel at, relax and enjoy coastal geomorphology. Field guides to explain these processes (and the geodiversity that results) to the general public and children are few and far between. In contrast, there is a relative wealth of resources and organised activities introducing people to coastal wildlife, especially on rocky shores. These biological resources typically focus on the biology and climatic controls on their distribution, rather than how the biology interacts with its physical habitat. As an outcome of two recent rock coast biogeomorphology projects (www.biogeomorph.org/coastal/coastaldefencedbiodiversity and www.biogeomorph.org/coastal/bioprotection ), we produced the first known guide to understanding how biogeomorphological processes help create coastal landforms. The ‘Shore Shapers’ guide (www.biogeomorph.org/coastal/shoreshapers) is designed to: a) bring bioti...

2025, Ecological Engineering

Concrete flood defences, erosion control structures, port and harbour facilities, and renewable energy infrastructure are increasingly being built in the world's coastal regions. There is, however, strong evidence to suggest that these structures are poor surrogates for natural rocky shores, often supporting assemblages with lower species abundance and diversity. Ecological engineering opportunities to enhance structures for biodiversity conservation (and other management goals) are therefore being sought, but the majority of work so far has concentrated on structural design features at the centimetremeter scale. We deployed concrete tiles with four easily-reproducible fine-scale (millimetre) textures (control, smoothed, grooved and exposed aggregate) in the intertidal zone to test opportunities for facilitating colonisation by a dominant ecosystem engineer (barnacles) relative to natural rock. Concrete texture had a significant effect on colonisation; smoothed tiles supported significantly fewer numbers of barnacles, and those with intermediate roughness (grooved concrete) significantly greater numbers, after one settlement season. The successful recruitment of early colonists is a critical stage in the development of more complex and diverse macrobenthic assemblages, especially those that provide physical habitat structure for other species. Our observations show that this can be facilitated relatively simply for barnacles on marine concrete by manipulating surface heterogeneity at a millimetre scale. Alongside other larger-scale manipulation (e.g. creating holes and pools), including fine-scale habitat heterogeneity in engineering designs can support international efforts to maximise the ecological value of marine urban infrastructure.

2025, Frontiers in Marine Science

2025, La UTN en la Antártida

La Antártida es el continente con las condiciones climáticas más severas de nuestro
planeta. Aunque a primera vista pueda parecer una vasta y desolada extensión de hielo,
es un ecosistema único que alberga una sorprendente biodiversidad. La vida en este
entorno extremo ha logrado adaptarse a condiciones que pocos lugares en la Tierra
pueden ofrecer: temperaturas bajo cero, vientos huracanados y largas temporadas de
oscuridad invernal. Sin embargo, esta riqueza natural se encuentra bajo amenaza debido
a los crecientes peligros ambientales.

2025, AES Bioflux

Agusan Marsh is the 1009 RAMSAR site, a wildlife sanctuary which harbour unique and pristine faunal species. It is considered one of the most ecologically significant wetland ecosystems in the Philippines. The study assessed species distribution and abundance using Geographic Information System Map in Agusan Marsh between Sago Palm and Terminalia Forest. Results showed a total of 322 individuals, 11 species and 6 families of amphibians documented. Of the 11 species of amphibians documented in Sago Palm and Terminalia Forest, 6 were Philippine endemics, 3 were invasive species in the area. Terminalia forest had the highest number of individuals documented during the conduct of the study. Sago Palm and Terminalia Forest have almost the same type of vegetation where amphibian species thrive most. Furthermore, ecological and environmental threats (conversion of Terminalia Forest to agricultural land, runoff of environmental pollutants, pesticides run-off and Kaingin or Slash and Burns) ...

2025, Zenodo (CERN European Organization for Nuclear Research)

Ulhas River Estuary (URE) sediment is highly silted. Boleophthalmus dussumieri (Val., 1837) is a mudskipper species of a common occurrence on the intertidal mudflats developed on either banks of URE. The present study recorded the various activities like burrow construction, feeding, territoriality and courtship, of B. dussumieri using scan and focal sampling method on the surface during tidal movements on the exposed mudflats of URE near Kolshet creek. Although the breeding and territoriality of B. dussumieri being normal, the other behavioral activities such as courtship, construction of burrows and survivorship were different as compared to the earlier observations by various experts. Breeding pairs preferred to develop burrows at spring tide limits. Burrows lacked chimneys and pit-pools. Juveniles remained without burrows and were found to secure position by penetration in loose soil during flood tide. Feeding on muddy surface was performed by strange straining behaviour.

2025, PeerJ

Recruitment is a key demographic step for the persistence of populations, so understanding its drivers has traditionally been a relevant goal of ecology. On marine rocky shores, coastal oceanography is an important driver of the recruitment of intertidal invertebrates that reproduce through pelagic larvae by affecting larval transport and delivery. The intermittent upwelling hypothesis (IUH) posits that coastal pelagic larvae are driven offshore under intense upwelling or to depths under intense downwelling, while weak upwelling allows larvae to stay near the shore, thereby facilitating intertidal recruitment. The IUH thus predicts a unimodal relationship between Bakun's upwelling index (BUI) and intertidal recruitment. The IUH has been supported by studies that plotted simultaneously single average values of recruitment and BUI for various coastal locations that collectively span downwelling to upwelling conditions. Based on its theoretical foundations, the IUH should also hold for a target location analyzed over the years provided enough interannual variation in BUI. On the Atlantic Canadian coast in Nova Scotia, upwelling varies interannually depending on wind patterns. Therefore, for a location that is representative of the abiotic and biotic conditions on this coast (Western Head), we tested the IUH by measuring annual intertidal barnacle recruitment and BUI for the pelagic larval season of barnacles for a period of 10 years (2014-2024). On this coast, BUI averaged for the barnacle larval season varied among years from mild downwelling to clear upwelling. Generalized additive modelling revealed a unimodal relationship between intertidal barnacle recruitment and BUI, thereby supporting the IUH. These results add this western ocean boundary to the known list of coastal systems where upwelling may influence intertidal invertebrate recruitment.

2025

Ascophyllum nodosum, better known as rockweed, is a commercially important, harvested intertidal brown alga species common in coastal Maine. Rockweed sea vegetable harvesting is a lucrative wild harvest fishery, that has also proved to be socially contentious and whose future management is uncertain 1,2 . A. nodosum is an intertidal macroalgal species that may also be impacted by sea level rise. Through a combination of biomass estimation, newspaper analysis, and interview data collection, this project seeks to (a) develop a typology of ecological services of A. nodosum in harvested and unharvested areas in the state of Maine; and (b) assess the stakeholder perspectives amidst the Ross v. Acadian Sea Plants Ltd. court case.

2025

La plupart des limicoles de l'hémisphère nord nichent dans la toundra circumpolaire et passent la période de non-reproduction sur les escales migratoires et les sites d'hivernage en domaine tempéré à tropical. Pendant cette... more

2025, Current Science

A study of the temporal effect on the abundance and diversity of intertidal rocky shore macroalgae revealed that there are ~70 species in the intertidal rocky shore of Anjuna (60 species) and Vagator (52 species) in Goa, India. Results showed that premonsoon (May) and post-monsoon (December) seasons favoured high species richness and abundance in both the study sites. In both cases, species diversity was low during the monsoon months (July and August). The study showed that low diversity might be a monsoonal effect and it coincides with the growth of Ulva and Porphyra species. The growth of opportunistic annuals brings about an ephemeral dominance of the macroalgal community by annual macroalgae. The driver is believed to be the nutrient influx from surface run-off, change in salinity and temperature due to high precipitation. The study showed that monsoon could have a role on the macroalgal community dynamics, and there was a strong correlation between diversity and biomass.

2025

In the present paper we describe fish assemblages of rocky intertidal pools and intertidal areas of sandy beaches of the Azores. Blennies (Parablennius sanguinolentus parvicornis, Coryphoblennius galerita and Lipophrys trigloides) constitute the dominant resident fish family in the intertidal pools. Thirteen species were encountered in intertidal pools. Richness is higher in the 3rd quarter of the year with 12 species and lower in the 1st and 2nd quarters with 8 species occurring in the samples. Diversity is also higher in the 3rd quarter. The small variation can mostly be attributed to transient species and juveniles using the shore as a nursery ground. Fifteen species occurred in the intertidal region of the protected shallow sandy beach of Porto Pim. This fish assemblage was dominated by juveniles of transient species. No resident species were present here. Richness and abundance were higher in 3rd and 4th quarters due to recruitment of juveniles, and the occurrence of migrant and transient species.

2025

Callichirus major (Say 1818), a burrowing shrimp inhabiting sandy beaches, presents increasing economic importance due to its use as live bait. Considering the complete absence of studies concerning its spatial distribution and density along the Brazilian Northeastern coast, this study investigate its ecology at a sandy beach, Piedade, just south from Recife, Pernambuco, Brazil (08°11’S and 34°55’W), from December 1999 to September 2000. Significant differences between burrow densities were found along the 10 sampling months, profiles and beach strata. The beach morphodynamics, measured as a profile of the vertical variation with time, was significantly related to burrow density variation at the upper strata. However, this influence was not reflected on the population structure.

2025, Frontiers in Ecology and Evolution

Heat waves have increased in frequency, duration, and magnitude in recent decades, causing mass mortality events in terrestrial and aquatic ecosystems. Arguably, mass mortalities of habitat-forming organisms – i.e., dominant sessile organisms that define habitats via their own physical structure – would be amongst the most dramatic impact of heat waves because of their negative, cascading consequences on their associated biodiversity. However, the resistance of habitat-forming organisms to heat waves can be enhanced if they associate with secondary habitat formers able to tolerate and modulate extreme heat levels. Here we show that a seaweed of the Porphyra/Pyropia (P/P) clade can shield primary habitat-forming mussels, Brachidontes rodriguezii, from the impacts of extreme temperatures in a southwestern Atlantic rocky intertidal shore. By means of P/P removal experiments and surveys, we illustrate that P/P cover (a) buffers temperatures in the understory mussel beds during daytime a...

2025

Rocky shores are considered heterogeneous environments due to their composition and structure. Therefore, they support numerous habitats for flora and fauna. Organisms found on rocky shores are facing intense physicochemical conditions during tidal changes from upper to lower intertidal zones. Total (N=1888) specimens were collected on seasonal basis from intertidal zone during low tide from two rocky sites of Karachi coast, Buleji and Sunehri during January 2017 to December 2017. The highest number of individuals (N=1041), were recorded from Buleji than Sunehri (N= 847). The seasonal abundance in Mollusca were measured as (36.84%), (63.67%), (25.08) and (40.38%) from Buleji while from Sunehri (45.16 %), (46.01%), (48.65) and (42.79 %) during pre-monsoon, south-west monsoon, post monsoon and north-east monsoon season respectively. Group Arthropoda, Mollusca and Echinodermata were shows the highest abundance of the species at both sites as compare to other groups. The highest diversity index from Sunehri (H'=0.64) was measured in north-east monsoon season meanwhile, (H'=0.61) was measured in post monsoon season from Buleji coast. Evenness index (J'=0.25) in pre-monsoon season from Buleji and (J'=0.28) in south-west monsoon season from Sunehri coast . Season shows the great abundance of species as compare to other seasons. No significant correlation was observed in between seasons, water temperature and salinity with macrofauna groups at both sites.

2025, Journal of the Marine Biological Association of the United Kingdom

Examining how variability in population abundance and distribution is allotted among different spatial scales can inform of processes that are likely to generate that variability. Results of studies dealing with scale issues in marine benthic communities suggest that variability is concentrated at small spatial scales (from tens of centimetres to few metres) and that spatial patterns of variation are consistent across ecosystems characterized by contrasting physical and biotic conditions, but this has not been formally tested. Here we quantified the variability in the distribution of intertidal rocky shore communities at a range of spatial scales, from tens of centimetres to thousands of kilometres, both in the NE Atlantic and the Mediterranean, and tested whether the observed patterns differed between the two basins. We focused on canopy-forming macroalgae and associated understorey assemblages in the low intertidal, and on the distribution of Patella limpets at mid intertidal leve...

2025

The Uttara Kannada District Sea Board lies between 74° 9' to 75°10' east longitude and 13° 55' to 15° 31' north latitude and extends over an area of 10,327 Sq. km. The district has three main and distinctive regions: the Coastlands, the Sahyadri range and Eastern margin where the tableland begins. The coastlines are the best-developed area with a high degree of economic development and a high density of population. It is in this region, Karwar, Ankola, Kumta, Honavar and Bhatkal taluks are located. The five important rivers of Uttara Kannada are Kalinadi, Gangavali, Aghanashini Sharavathi and Venktapur. The mangrove zone towards the river mouth, having higher salinity, is known as 'euhaline'. Along the coast of Uttara Kannada, the river mouths are rocky and with strong wave action, and not suitable for mangroves. This is unlike the deltaic river mouths of the east coast, where mangroves can grow luxuriantly. The euhaline zone has salinity range from 30 ppt to...

2025, Revista Escenarios Actuales. CESIM. Ejército de Chile

El cambio climático ha facilitado la navegación y prospecciones en
la banquisa del océano Ártico, y los países con intereses geopolíticos
y geoestratégicos en el área han venido dejando en evidencia el
desarrollo de capacidades militares para influir en el Círculo Polar.
Este artículo analiza las variables geográficas de los Estados con
proyección geofísica en ese espacio del planeta y revela cómo las
Las reclamaciones políticas o estratégicas en el Ártico se vinculan con
asuntos operacionales o con el empleo de la fuerza en procura de lograr objetivos nacionales. Sin embargo, el calentamiento global, los desafíos geofísicos y los intereses de los actores podrían marcar las diferencias en sus resultados y prolongar su condición de espacio global preservado para el futuro bienestar de la humanidad.

2025

La formación de las dotaciones antárticas del Ejército es un proceso de alta exigencia que debe preparar a las personas para operar, durante un año, en un ambiente distinto, hostil y esencialmente distante de las otras porciones territoriales chilenas. En este proceso, el estudio de los factores humanos y la influencia del factor sicológico ha sido esencial para el éxito de las misiones que a lo largo de 75 años, el Ejército de Chile, ha desplegado en el territorio antártico generando un sello distintivo y crucial, junto al aporte en la mantención de la soberanía, el apoyo a las operaciones militares distintas a la guerra, garantizando las condiciones de seguridad operacional para las diferentes dotaciones de científicos y personal civil que ha visitado el continente helado. El estudio e investigación de los factores humanos con énfasis en la psicología y la salud mental ha permitido crear un perfil psicológico claro y específico de nuestro personal militar y contribuido a generar nuevos conocimientos sobre el comportamiento humano en ambientes extremos, creando un ambiente seguro y resilente para las diferentes dotaciones que ha operado con eficiencia y versatilidad durante más de siete décadas.

2025, International Journal of Advance and Innovative Research

2025, Boletín de Investigaciones Marinas y Costeras

We studied the circadian behavior during the foraging activity of the gastropod Nerita scabricosta at low tide. To measure the behavior we recorded the traveled distance and corresponding duration during foraging activity, according to the dial periods (day and night) in April 2010. Gastropods were measured and weighed after fiishing their activity. Finally, values of air temperature and humidity were recorded for each sampling time and dial period. The foraging activity by N. scabricosta did not vary signifiantly between day and night. However duration increased at night, period characterized by lower temperature and higher humidity. In addition, it was found that the activity was continuous, regardless the period.

2025, Scientific Data

At a proximal level, the physiological impacts of global climate change on ectothermic organisms are manifest as changes in body temperatures. Especially for plants and animals exposed to direct solar radiation, body temperatures can be substantially different from air temperatures. We deployed biomimetic sensors that approximate the thermal characteristics of intertidal mussels at 71 sites worldwide, from 1998-present. Loggers recorded temperatures at 10–30 min intervals nearly continuously at multiple intertidal elevations. Comparisons against direct measurements of mussel tissue temperature indicated errors of ~2.0–2.5 °C, during daily fluctuations that often exceeded 15°–20 °C. Geographic patterns in thermal stress based on biomimetic logger measurements were generally far more complex than anticipated based only on ‘habitat-level’ measurements of air or sea surface temperature. This unique data set provides an opportunity to link physiological measurements with spatially- and t...

2025, Ecol Monogr

We explicitly quantified spatial and temporal patterns in the body temperature of an ecologically important species of intertidal invertebrate, the mussel Mytilus californianus, along the majority of its latitudinal range from Washington to southern California, USA. Using long-term (five years), high-frequency temperature records recorded at multiple sites, we tested the hypothesis that local ''modifying factors'' such as the timing of low tide in summer can lead to large-scale geographic mosaics of body temperature. Our results show that patterns of body temperature during aerial exposure at low tide vary in physiologically meaningful and often counterintuitive ways over large sections of this species' geographic range. We evaluated the spatial correlations among sites to explore how body temperatures change along the latitudinal gradient, and these analyses show that ''hot spots'' and ''cold spots'' exist where temperatures are hotter or colder than expected based on latitude. We identified four major hot spots and four cold spots along the entire geographic gradient with at least one hot spot and one cold spot in each of the three regions examined (Washington-Oregon, Central California, and Southern California). Temporal autocorrelation analysis of year-to-year consistency and temporal predictability in the mussel body temperatures revealed that southern animals experience higher levels of predictability in thermal signals than northern animals. We also explored the role of wave splash at a subset of sites and found that while average daily temperature extremes varied between sites with different levels of wave splash, yearly extreme temperatures were often similar, as were patterns of predictability. Our results suggest that regional patterns of tidal regime and local pattern of wave splash can overwhelm those of large-scale climate in driving patterns of body temperature, leading to complex thermal mosaics of temperature rather than simple latitudinal gradients. A narrow focus on population changes only at range margins may overlook climatically forced local extinctions and other population changes at sites well within a species range. Our results emphasize the importance of quantitatively examining biogeographic patterns in environmental variables at scales relevant to organisms, and in forecasting the impacts of changes in climate across species ranges.

2025, Journal of the Marine Biological Association of the United Kingdom

Coastal ecosystems are highly complex and driven by multiple environmental factors. To date we lack scientific evidence for the relative contribution of natural and anthropogenic drivers for the majority of marine habitats in order to adequately assess the role of different stressors across the European seas. Such relationship can be investigated by analysing the correlation between environmental variables and biotic patterns in multivariate space and taking into account non-linearities. Within the framework of the EMBOS (European Marine Biodiversity Observatory System) programme, hard bottom intertidal communities were sampled in a standardized way across European seas. Links between key natural and anthropogenic drivers and hard bottom communities were analysed using Boosted Regression Trees modelling. The study identified strong interregional variability and showed that patterns of hard bottom macroalgal and invertebrate communities were primarily a function of tidal regime, nutr...

2025, Arabian Journal of Geosciences

At Ras Kadhma embayment (north Kuwait), fabrics such as micrite envelopes, calcified microbial filaments, and micritic grain-to-grain bridges are observed in this modern sabkha environment in Kuwait Bay, associated with a tripartite facies classification. Three tidal zones were delineated by 8 vertical core samples, each marked by laterally diachronous units with different lithofacies and biofacies. Microbial populations (Lyngbya and Schizothrix), living within a distinct differentiated intertidal flat zone, were identified and their effects on sediments recorded. The extreme salinity, temperature, and chemical gradients in the shoreline environment have contributed to a microbial ecosystem that is trapping, binding, and biologically inducing CaCO 3 precipitation, producing a variety of sedimentary structures now conventionally regarded as MISS (microbially induced sedimentary structures). The microbial fabrics are preserved in aggregates within the intertidal to the continental vadose zone. Core samples and outcrops were collected and analyzed mineralogically, chemically, and microbiologically. Field mapping on a meter scale reveals a concentric zonation, subtidal, intertidal, and supratidal zones, distinguished by textural and biological differences. Distinct lithofacies reveal varying stages of biomineralization with optimum conditions developed in the intertidal and lagoon sediments enhanced by microbial populations. The results of the study contribute to the understanding of the complex interaction between microorganism forming mats, the tidal flat sediments, and the physical parameters that control this setting in Kadhma Bay. Recurring colonization of these siliciclastic sediments in the intertidal zone will be permanently terminated in the coming decades by advancing intertidal sand bars resulting from the destruction of the Tigris-Euphrates delta.

2025, Yorkshire History Quarterly - revised 2025

The tall four-storey octagonal chalk tower is 79 feet high is the oldest surviving lighthouse in England. It was built in 1674 as a lighthouse by Sir John Clayton and partner George Blake as a business venture. It was never used because suitable voluntary dues from passing ships were inadequate. Today it stands silent a gleaming monument on a golf course. The Beacon Tower Lighthouse is surrounded by modern posts and wire fences which separate it from the golf course. It is occasionally open to the public and can be viewed very easily from the road.

2025

The fish diversity of intertidal rock pools in the Glorieuses Islands was investigated using clove-oil anaesthetic. That method, is easy to use and safety is well adapted for this type of census. A total of thirty two species belonging to 14 families were sampled. Of these, 19 were observed as adults in most stations and represented the typical population of these intertidal pools, in particular the Blenniidae that presented the highest species richness and the Gobiidae, which were the most abundant. The 13 remaining species were only observed during their juvenile state and appeared to be only temporary residents. More than half of the species collected (17/32 spp) were not recorded during the previous ichthyofauna study at the Glorieuses islands using UVC, results that show the importance of the anaesthetic method that allows the collection of smaller-sized species that live inside the reef framework and are consequently more difficult to record.

2025, Marine Ecology Progress Series

2025, Journal of Molluscan Studies

We studied the distribution, abundance and size structure of three limpet species (Patella rustica, Patella candei crenata and Patella aspera) throughout the rocky intertidal zone of the Canary Archipelago. We used a stratified and hierarchical sampling strategy that involved the study of three intertidal zones (high, intermediate and low intertidal) across eight islands with three random locations per island and three randomly selected sites within locations. We did not observe any specimens of P. candei candei. For the entire archipelago, the least abundant species was P. candei crenata (0.02 ^0.05 individuals/0.25 m 2 , average ^SD), the species with significantly greatest sizes (26.8 ^11.08 mm, average ^SD) and of highest commercial interest. Patella aspera (0.08 ^0.37 individuals/0.25 m 2 ) and P. rustica (0.069 ^0.16 individuals/0.25 m 2 ) showed higher abundance, but smaller sizes (21.0 ^9.21 and 18.1 ^7.94 mm, respectively). The three zones influence how these species are distributed and these distribution patterns are homogenous among islands. Patella rustica was observed to be more abundant in the intermediate zone and P. aspera in the lower zone, while P. candei crenata showed similar abundance in the low and intermediate zones. This vertical variability is masked by a horizontal variability on small and intermediate scales (10 s to 1000 s of meters), but not among islands (10 s to 100 s of km). This fact can be attributed to the low abundance of the limpet species in the locations studied, as a result of overexploitation of this resource in the Canary Islands. Consequently, there is a need for management and control measures.

2025, Bulletin of Marine Science

A study of the rocky intertidal environments of the Florida Keys by Stephenson and Stephenson (1950) serves as a valuable baseline of littoral communities prior to extensive development and human population pressures. Five of the study areas originally surveyed in 1947 were resurveyed in 1999 to assess any community changes which may have occurred in the intervening 52 yrs. A more extensive sampling effort in 1999 yielded a greater number of taxa as compared to 1947 (120 vs 78). However, one intertidal zone showed a decrease in taxa richness, not all species recorded in 1947 were seen in 1999, and others had shifts in abundance or zones of occurrence. The gray zone at the high mean water mark may have experienced degradation from the deposition of seagrass, debris, or hydrophobic substances as suggested by a 79% decrease in the species that occurred there, despite an increase in the number of species found in all other zones. Harvesting, pollution, or general habitat degradation may explain the complete absence or reduced abundance of some species, particularly those considered as dominant or characteristic intertidal community members in 1947. Increased nearshore eutrophication and/or changes in grazer communities may explain an apparent upward shift of some macroalgal species and the appearance at more heavily developed sites of algal nutrient indicator species (e.g., Cladophora, Chaetomorpha, and Enteromorpha). Our results are consistent with increasing evidence that disturbances, such as eutrophication, are having a negative effect on rocky intertidal communities of the Florida Keys.

2025, Botanical Studies

the naked eye at the adaxial base of stipules in the species of mangrove Rhizophoraceae Sheue et al., 2003a, b;. Except for the genus Bruguiera, colleters, although few in number, are also present within the bracteoles of mangrove Rhizophoraceae inflorescences Sheue et al., 2003a). Colleters are external secretory structures , characterized by the production of a viscous substance that covers, protects from desiccation, and lubricates the bud and young leaves of plants ( . Hou (1958) mentioned that colleters in Rhizophoraceae were first observed by Alston in African Cassipourea, and later by Metcalfe and Chalk in Carallia (both inland genera). These glandular emergences inside the adaxial regions of stipules appear to occur in all Malaysian genera, both mangrove and inland (Hou, 1858). Colleter exudates from this family are assumed to be composed of phenolic compounds . Colleters have long been associated with a number of flowering plants, notably Apocynaceae and Rubiaceae. The color and consistency of colleter exudates are variable in

2025, Itinerarios Educativos

Este trabajo se ubica en los debates en torno a los procesos de aprendizaje. Nos situamos en una perspectiva de análisis que reflexiona sobre la práctica cotidiana situada y entendemos que todo proceso de construcción de conocimiento ocurre en un entramado relacional que otorga condiciones de posibilidad al aprendizaje incluyendo prácticas, artefactos y rutinas históricas que pueden ser acumuladas y utilizadas con posterioridad. Desde una perspectiva histórico etnográfica, analizamos las modalidades de construcción de conocimiento que ocurren en Antártida. Indagamos en las prácticas desarrolladas por personal científico y técnico, considerando la circulación de saberes, rutinas y utilización de artefactos y el desarrollo de comunidades de práctica. Suponemos que toda actividad, incluida el aprendizaje, está situada en y hecha de las relaciones entre personas, contextos y prácticas. De este modo, analizamos cómo se configuran dichas relaciones tomando en cuenta las diversas formaciones y trayectorias de los sujetos, variables como la «experiencia antártica», la cantidad de campañas de investigación realizadas, entre otras cuestiones.

2025, Journal of the Marine Biological Association of the United Kingdom

2025, Boletín de Investigaciones Marinas y Costeras

La presente investigación hace parte de los resultados de las tres primeras expediciones de Colombia a la Antártida occidental y se enfocó en la sistemática y diversidad taxonómica de la comunidad bentónica de moluscos recolectados entre 5 y 400 m de profundidad. Las estaciones de muestreo se ubicaron en los estrechos de Gerlache y Bransfield, alrededor del archipiélago Palmer y las islas Shetland del Sur, adyacentes a la península Antártica. Se presenta el listado de especies identificadas que se encuentran depositadas en el Museo de Historia Natural Marina de Colombia -Makuriwa, del Instituto de Investigaciones Marinas y Costeras José Benito Vives de Andréis -Invemar. Este inventario constó de 15 ejemplares distribuidos en 10 taxa, de los cuales 7 fueron gasterópodos con concha (incluidos 5 microgasterópodos) y 3 fueron bivalvos. Cuatro microgasterópodos fueron ubicados en categorías taxonómicas superiores a especie debido al bajo conocimiento de estos taxa en la región (Anatoma sp., Cingulopsoidea sp., Truncatelloidea sp. y Eatoniella sp.). Los demás gasterópodos (3) correspondieron a Margarella antarctica, Prosipho turritus y Nacella concinna. Los bivalvos encontrados fueron Philobrya sublaevis, Adacnarca nitens y Thracia meridionalis. Las especies identificadas se han registrado previamente en la Antártida occidental. Algunas, como los bivalvos, presentan una distribución circumantártica. Nacella concinna fue el taxón más abundante. En coherencia con el objetivo general del proyecto “BioGerlache-Antártica”, los resultados generan aportes a los inventarios biológicos de la Antártida, contribuyendo a ampliar la información para definir a futuro posibles áreas de conservación.

2025, Boletín de Investigaciones Marinas y Costeras

Los peces criptobentónicos contribuyen de manera significativa a la dinámica trófica de los ecosistemas costeros. Este estudio tuvo como objetivo determinar la composición de esta comunidad y comprobar si su estructura difiere temporal y espacialmente en el Parque Nacional Natural Uramba Bahía Málaga (Pacífico Oriental Tropical). Los peces se recolectaron utilizando sustratos artificiales en tres zonas, entre junio de 2008 y agosto de 2009. Se registraron 26 especies, pertenecientes a 11 familias. Gobiidae y Labrisomidae fueron las familias más representativas (especies: 34,6 % e individuos: 66 %). La riqueza y abundancia aumentó en un gradiente del interior hacia el exterior del parque. Utilizando estadística multivariada, se identificó un patrón espacial en la estructura de la comunidad, con localidades internas significativamente diferentes de las medias y externas. Cerdale ionthas, Gobiosoma seminudum, Starksia fulva y Gobulus hancocki fueron responsables de esta diferenciación (contribución > 59 %). El uso de sustratos artificiales para tomar muestras de peces criptobentónicos demostró ser una forma eficiente de identificar una parte de la ictiofauna que no había sido identificada mediante técnicas de muestreo tradicionales y también fue útil para comparar la variabilidad espacial de esta comunidad. La comparación con comunidades de peces criptobentónicos en otras regiones biogeográficas indica que, debido a la baja riqueza de especies en el Pacífico Oriental Tropical, estas comunidades tanto en Colombia como en México muestran baja redundancia funcional y considerables diferencias en sus preferencias tróficas.

2025, Plan de Sitio de la remodelación de la Estación Científica Antártica Machupicchu y su ámbito de influencia en la Bahía de Almirantazgo

El estudio de Plan de Sitio para el ámbito de la nueva Estación Científica Antártica Machu Picchu (ECAMP) tiene como finalidad de ordenar y gestionar las actividades antrópicas asociadas a las instalaciones y su zona de influencia en la Bahía de Almirantazgo en la Antártica. Asimismo, se buscará establecer indicadores y pautas para el monitoreo y la gestión de impactos de la actividad antrópica en el ámbito de dicha estación

2025

Gastropods have important economic value because the shell can be used for a variety of decorations are expensive and the meat as a source of food. Gastropods also a key organism in the food chain in aquatic ecosystems. This research aims to determine the diversity and density of gastropods and environmental conditions that affect gastropods. The usefulness of the research is as information for the relevant agencies and parties that need as well as information for further research. The research was conducted in morindino village waters from August to October 2014. The placement transect squared/plots based on the state of the substrate is sandy and rocky beaches. The results found 20 species of gastropods which belong to 17 genera in 16 families. Density on the rocky shore organisms higher than the sandy beach that is 29.11 ind/m 2 while the sandy beach that is 1.44 ind/m 2 . Rocky shore species diversity in higher at 1.8742 while the lower sandy beach which is 1.5858. However overa...

2025, Lecture Notes in Civil Engineering

This paper explores the dynamics between nuclear plants, politics, and
anti-nuclear movements in Taiwan. By analyzing the development of anti-nuclear movements in Taiwan, this research highlights the complex role of political parties in the anti-nuclear movements. The environmental impact of nuclear power plants is a multifaceted issue involving considerations ranging from emissions to waste management and potential accidents. Politics plays a significant role in shaping the environmental impact of nuclear power. The politicization of anti-nuclear energy in Taiwan is a complex and multifaceted issue. Taiwan has experienced significant debate and division over the role of nuclear energy in its overall energy policies. One major factor contributing to the resurgence of anti-nuclear power in Taiwan is the Fukushima nuclear disaster. This event heightened public concerns about the safety
of nuclear power, leading to increased opposition to nuclear energy and calls for its phase-out. Taiwan’s political landscape and domestic and international pressures have also contributed to politicizing this issue. Taiwan’s government has navigated this complex landscape by outlining plans to gradually reduce its reliance on nuclear power while increasing investments in renewable energy. The politicization of anti-nuclear energy in Taiwan reflects more significant societal concerns about environmental safety, energy independence, and the balance between economic development
and sustainable practices. This article aims to address Taiwan’s current energy challenges, explore the evolution and policy priorities of Taiwan’s energy policies, discuss the implementation effectiveness of Taiwan’s energy policies, and finally outline the vision for Taiwan’s future energy development from the ruling party’s energy policy.

2025, HAL (Le Centre pour la Communication Scientifique Directe)

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

2025, Ecologies

To explain the distribution and abundance of species, ecology searches for general models. A pattern often encountered in nature is the interspecific abundance–occupancy relationship (AOR), which describes how the mean local abundance of species relates to the proportion of local sites that each species occupies. Both are central variables in ecology and are often positively correlated, although exceptions have been found. As most AOR research has been conducted with terrestrial systems, recent studies are testing for its occurrence in marine systems. This contribution tests the AOR for invertebrate metacommunities associated with intertidal mussel patches. Using data from six coastal locations from Nova Scotia (Canada), this study shows that the negative binomial model properly describes the relationship between abundance and occupancy for these systems. The degree of wave exposure (wave-sheltered versus wave-exposed habitats) had some influence on the shape of the AOR. Overall, these findings extend the applicability of the AOR to intertidal invertebrate metacommunities. The raw data are included as part of this article to help future syntheses on the AOR, which will need data for a variety of terrestrial and aquatic environments.

2025, The Pharma Innovation Journal

A short-term field study was undertaken for the first time to know the ant diversity in the mangroves of Purba Medinipur district, West Bengal. Present study revealed 12 species belonging to 04 subfamilies of ants are associated with 05 species of mangrove plants. The abundance of ants was high in Sonneratia apetala with 05 species, followed by Avicennia officinalis (03), Avicennia marina (02), Acanthus ilicifolius and Pandanus odoratissimus (01).