Freshwater Zooplankton Ecology and Systematics Research Papers (original) (raw)

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- Business, Botany, Aquatic Ecology, Conservation Biology

This research study aimed to analyze the physico-chemical characteristics of Bitan-ag creek and to assess zooplankton diversity. Specifically, it determined (1) the physico-chemical condition and nutrient load of the creek and compared to DENR Administrative Order (DAO) standard, (2) assessed how the physico-chemical parameters affect the distribution and abundance of zooplankton, (3) identify zooplankton species that are found in each sampling sites, (4) measure significant difference on the abundance and diversity of zooplankton between sites. The study made used of the descriptive-comparative design to determine quantitatively water quality parameters such as conductivity, water temperature, TDS, turbidity, salinity, water current, COD, DO, pH, nitrates and phosphorus. The results clearly revealed that some physico-chemical and nutrient load parameters exceeded the standard of class "C" water body, this includes: conductivity, TDS, turbidity, DO and phosphate content. A total of five (5) species of zooplankton belonging to three (3) families namely: Appendicularia, Daphniidae and Ameiridae were present. Family ameiridae had the highest total number of three individuals which are found in first and third sites, whereas, the appendicularia and daphniidae settled only in the third sampling sites. Further, the study also showed significant difference on the abundance and diversity of zooplankton between sites. Thus, the distribution and abundance of zooplankton in Bitan-ag creek were greatly influenced by the condition of its physico-chemical and nutrient chemistry. The research suggested that there should be rehabilitation of Bitan-ag creek to avoid further degradation of its water quality.

Rotifers are cosmopolitan organisms which are considered as an important bioindicator of water quality because of their dependence on abiotic and biotic properties in their environment. Tadlac Lake water was continuously degrading because of settlement of aquaculture structures, however, it was managed to prevent further deterioration of the lake. To determine the current condition of the lake, this study assessed the composition of rotifers present in the lake. Plankters were collected from the seven (7) stations: two (2) stations in limnetic zone and the other five (5) in the littoral zone through the use of 20µm plankton net. From the seven sampling stations, there are 26 taxa of rotifer and a single group of Cladocera identified. The most abundant, densest and most important species is the Brachionus forficula with the values of 41.94%, 31.67% and 26.89%, respectively. Moreover, Brachionus angularis, Brachionus havanaensis, Cladoceran group and Brachionus forficula was determined as the most frequent species. The abundance of rotifer, specifically genus Brachionus indicates that Tadlac Lake is still experiencing eutrophication.

ABSTRACT: A survey was conducted on biodiversity of fish fauna of Lake Kolleru, a freshwater wetland of International importance with an objective to assess freshwater fish diversity and their conservation status. Regular monthly sampling was carried out from January, 2012 to December, 2013. Study revealed the presence of 92 species of fish belonging to 13 orders, 34 families and 57 genera. Order cypriniformes was the dominant group with 30 species followed by mugiliformes with 17 species, siluriformes with 15 species, perciformes with 14 species, cyprinodontiformes with 4 species, anguilliformes and mastacembeliformes each with 3 species and osteoglossiformes, elopiformes, gonorhynchiformes, characiformes, pleuronectiformes and tetraodontiformes each with 1 species. Out of 92 species, 5 species are endangered, 1 species is critically endangered, 2 species are at lower risk least concern, 15 are vulnerable, 27 are at lower risk near threatened, 40 species were not evaluated and for 1 species data is deficient according to CAMP (1998) conservation status. As per IUCN (2013) Red List category, 6 species are near threatened, 1 species is endangered, 1 species is vulnerable, 65 are least concern, 16 were not evaluated and for 3 species data is deficient. Habitat loss, pollution, over exploitation, human interference, trade and siltation are the major threats causing biodiversity loss of this Lake of which pollution and habitat loss are the most contributing factors. There is an urgent need to develop a sustainable fishery management to conserve the biodiversity of this lake.
KEYWORDS : Biodiversity, CAMP, Conservation,
IUCN, Lake Kolleru

Bakun Dam was fully reached its supply level of 228 m above sea level...

- by shabdin Mohd Long and +2
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- Freshwater Zooplankton Ecology and Systematics, Cladocera, Calanoida

: A water quality index (WQI) developed by the Canadian council of ministers of the Environment
(CCME) was applied to chikkakere , a lake at Periyapatna, Mysore district , Karnataka state, India to study its impact
on the protection of aquatic life. The index in the lake is rated as poor. The water quality is almost endangered or
deteriorated and the conditions often deviate from natural levels, Microcystis aeruginosa blooms are dominant in the
lake. These permanent blooms often cause huge fish kills. Nitchzia species are also dominant among
Bacillariophyaceae indicating pollution. Overall the lake water is unable to protect aquatic life. The water quality failed
to satisfy the parameters and its use for purposes like Drinking, Aquatic, Recreation, irrigation and livestock.

- by Ian Hogg and +2
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- Aquatic Ecology, Ecology, Zooplankton ecology, Lakes

The seasonal diversity of different types of zooplankton was obserevedfor theHiran-II reservoir, Umerethi, Saurashtra region of Gujarat, India. The samples were collected from the surface water with the help of a plankton net having amesh size of 64 µm. The samples were preserved for further analysis. The zooplankton specieswere identified using key references. The zooplankton population showedthe correlation with the parameters of water temperature, dissolved oxygen, biochemical oxygen demand, hardness, alkalinity, phosphate, nitrate, total dissolved solids, total suspended solids, electrical conductivity, and transparency. The zooplankton was represented by 15% protozoa, 33% Rotifera, 46% Arthropoda and 6% Miscellaneous in the samples. The range of zooplankton recorded between 136 to 267no./l. The zooplankton density was minimum in January whereas the maximum was observed in October. This study may support to help towards the management of Hiran-II reservoir effectively in the region.

The aim of this study was to investigate the monthly spatial occurrence of phytoplankton and zooplankton in River Ogun, Abeokuta, Southwest Nigeria. This was carried out for seven months between December, 2011 and June, 2012 in 4 stations. A total of 41 species of phytoplankton and 16 zooplankton species from 5 classes respectively were recorded. Zooplankton was dominated by Cladocera throughout the study period while phytoplankton was dominated by blue green algae (Cyanophyta or Cyanobacteria). The dominance of Cyanophyta in this river is similar to findings by Sekadende and co-workers, Ogato, Deng and co-worker, and Shakila and co-worker. The dominance of Cladocera in this river is similar to findings by Ude and co-workers, and Ogbuagu and co-worker.

- by Andrey V . Tyutin and +1
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- Zooplankton ecology, Freshwater Zooplankton Ecology and Systematics, Cladocera
- by R Chris Jones
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- Fisheries, Aquaculture, Phytoplankton, Freshwater ecology (Biology) (Biology)

This study is the first faunistic inventory of a zooplankton community from an open, karstic and oligotrophic aquatic sinkhole in the south of the Yucatan Peninsula (Mexico), we describe the richness of the zooplankton collected with the combination of plankton nets and light traps of our own design, using morphological and molecular characters to identify the species and demonstrate the effectiveness of only one set of primers to sequence all taxa. Recently, it has been demonstrated that different sampling methods can increase the number of zooplankton species from tropical and temperate systems dramatically. These more effective methods together with DNA barcoding can give a new and more realistic picture of the species dwelling in a freshwater system. In total, we sequenced 268 specimens, and the list of species known in this sinkhole increased from 13 to 77 taxa, with a projection of 87 in total, including cladocerans, copepods, ostracods, fish larvae, tadpoles, rotifers, chironomids, water mites, among others. From the 77 taxa identified by us, 72 BINS (Barcode Index Numbers, equivalent to putative species) were assigned by the BOLD Database (boldsystems.org), and 30 of them are new records for both, BOLD and GenBank (www.ncbi.nlm.nih.gov). There was an essential

- by Lucía Montes Ortiz and +1
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- Bioindicators, DNA Barcoding, Freshwater Zooplankton Ecology and Systematics

- by Benjamin Dimowo
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- Geography, Environmental Science, Environmental Economics, Environmental Studies
- by Benjamin Dimowo
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- Management, Environmental Science, Limnology, Water quality

This checklist puts together available information on the taxonomy, distribution, and current status of freshwater microcrustacean zooplankton in the Philippines. To date, 81 species have been recorded from Philippine inland waters, including 55 cladoceran and 36 copepod species, in two cladoceran orders (six families); and in two copepod orders (four families). The level of endemicity and distribution patterns of microcrustaceans in the archipelago's freshwater systems reflects the island's origins, biogeographical status, and location in the tropics. However, there are problems: in terms of taxonomy, species level identification is often doubtful and further study on systematics and biogeography is needed to settle conflicts in identification. This is demonstrated by the 29 synonymies and misidentifications detected in previous Philippine records. In addition, the introduction of non-native species of fishes, zooplankton, and other aquatic organisms has begun negatively impacting inland aquatic biodiversity in the country, which is further excacerbated by eutrophication and other environmental changes.

- by Jhaydee Ann Pascual and +3
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- Freshwater Zooplankton Ecology and Systematics
- by Benjamin Dimowo
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- Fisheries, Biology, Artemia, Fisheries Management

We report the first record of the alien freshwater jellyfish Craspedacusta sowerbii in Gazivode Lake, northern Kosovo. Gazivode Lake is a drinking-water reservoir, with a depth of up to 107 m, located on the Ibar River. The occurrence of the jellyfish was recorded in August and September 2016. The abundance of the population was estimated at 50-60 ind./m 2 of water surface. The medusae were bell-shaped, with a diameter up to 20 mm and well-defined gonads that indicated mature female specimens.

The potential toxicity of copper to freshwater snail (Pila ovata) was investigated in a static renewal bioassay for 96 hours. Chemically pure salts of copper sulphate (CuSO4. 5H2O) dissolved in distilled water was used as toxicant. Five copper ion concentrations with a control group were prepared. The LC50 at 24 h, 48 h, 72 h and 96 h was 4.67, 2.12, 1.64 and 0.59 mg/l respectively. The LT50 of copper concentrations of 0.05 mg/l, 0.1 mg/l, 0.5 mg/l, 1.0 mg/l and 2.0 mg/l were 123.86 h, 97.20 h, 83.33 h, 75.32 h and 60.04 h respectively. No death was recorded in the controls. Survival time decreased with increasing concentrations of copper ion. The results showed that copper is toxic to Pila ovata and could pose serious threat to their survival in natural environment.

- by David Bruce Conn
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- Zoology, Aquatic Ecology, Invertebrate Biology, Conservation Ecology
- by David Bruce Conn
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- Environmental Science, Aquatic Ecology, Invertebrate Biology, Malacology

Investigation on the species composition and abundance of zooplankton in Ogun River, Abeokuta, Ogun state, Southwestern Nigeria was carried out for a period of seven months (December, 2011-June, 2012), Using hand trawling
method, 55 µm mesh size plankton net was trawled horizontally ten times to capture zooplankton. The zooplankton samples were put into properly labeled plastic containers and preserved in 4% formalin solution. A total of sixteen genera from five taxonomic groups were recorded from Ogun River. Cladocera predominated both in terms of species composition and abundance. Five species of Cladocera was recorded consisting of 31.25%. Protozoa and Rotifera recorded four species each consisting of 25%. Copepoda recorded two species consisting of 12.5%, and Ostracoda with one species consisting of 6.25%. The low nature of zooplankton abundance and species composition observed in this study must have been caused by the polluted nature of the water due to the anthropogenic activities carried out around its shores The dominance of Cladocera in this river is similar to findings from River Echara and River Imo, Southeastern Nigeria.

Establishing monitoring programs to detect the presence of biofouling mussels is critical to dealing with the problem efficiently. In many areas such programs must take into account the presence of the dark false mussel, Mytilopsis leucophaeata, a native dreissenid known as an occasional biofouler in some brackish water or estuarine areas. The adults of M. leucophaeata, are known to occur occasionally in freshwater environments, and all stages of Dreissena spp. may occur in brackish waters of low salinity. This provides ample room for potential population overlap between these two species. Thus, distinguishing between the two genera will be important for raw water users, particularly in coastal regions.This photographic guide provides photomicrographs and information designed to assist personnel involved with mussel monitoring programs. The guide provides material that will assist in: 1) discriminating between Dreissena sp. and Mytilopsis leucophaeata, 2) distinguishing larvae and postlarvae of various stages in both of these species, 3) identifying diagnostic larval structures in both living and fixed specimens, and 4) distinguishing healthy from dead or moribund specimens.

- by David Bruce Conn
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- Zoology, Invertebrate Biology, Freshwater Biology, Zooplankton Biology

For understanding the water quality state of Tigris river, the community structure of zooplanktons was studied in different seasons, and Shannon-wiener diversity index (H), Species Richness Index (D) and Species Uniformity Index (E) were applied. The Results show that the highest number of total zooplanktons in the period of the study was 25036.9 individuals / m 3 in the S3, while the lowest number of zooplankton in the period of the study was 16125 individuals / m 3 recorded in S1, The current study was recorded The dominance of Rotifers group in All study sites. The species richness index (D) recorded very good abundance and the values ranged between 3.083 to 9.15. The Shannon-Weiner index (H) for diversity ranged from 1.13 bit per Individual in the third station to 2.716 bit per individual in second station, through this Indicator, The Tigris River of the area of the study is a moderate in organic pollution. While the values of species Uniformity index (E) for the appearance of species ranged between the highest value 0.948 during the month of December in the S3 to the less value 0.435 during the month of January in the same station.

- by Marawy Aldulaimy and +1
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- Zooplankton ecology, Freshwater Zooplankton Ecology and Systematics

A one year investigation of the zooplankton community composition and dynamics in Lake Οzeros (western Greece) revealed 25 invertebrate species (16 rotifers, three copepods, five cladocerans and one mollusc larva). The mean zooplankton abundance fluctuated between 59.4 to 818 ind l-1, having maximum values in spring. The species composition and seasonal variation do not differentiate Lake Ozeros from the nearby lakes. The presence of the dominant calanoid copepod Eudiaptomus drieschi and some of the rotifer species recorded are characteristics of either oligo- or eutrophic lakes. According to the trophic state index (TSI) Lake Ozeros is a meso-eutrophic ecosystem, in which the eutrophic character was possibly the result of the high charge with phosphorus (being raised by 28.9 % in comparison to previous decades), which came into the lake via the surrounding agricultural cultivations and mainly the pig-raising activities. In contrast, the concentrations of ΝΟ3, ΝΟ2 and NH4 have consi...

RESUMEN El embalse de Betania es uno de los cuerpos de agua lénticos más importantes de Colombia, no solo por su importancia como generador de energía eléctrica sino por su uso como fuente de productividad económica a través de la piscicultura. Durante más de un año, se realizaron muestreos combinados de fitoplancton en diez estaciones del embalse de Betania. Las muestras se llevaron a un análisis cualitativo-cuantitativo, con el fin de poder establecer mediante el uso de índices ecológicos (Shannon-Weiver, Índice de Equidad de Pielou, Whilm and Dorris), el nivel de contaminación del agua y determinar si existe alguna fluctuación de ésta, entre las diferentes estaciones a lo largo del año. Los resultados permitieron concluir que el embalse de Betania presenta niveles de eutrofización, que se ven reflejados en la composición de organismos planctónicos registrados en los puntos de muestreo. Este proceso se intensifica cuando disminuyen las lluvias y coincide con una mayor mortandad de los peces. Es importante tomar medidas de manejo apropiadas, si se pretende prolongar la vida útil de este cuerpo de agua. ABSTRACT The Betania reservoir is one of the most important lentic systems in Colombia, not only for its importance as generator of electric energy but also for being one of the main sources of economic productivity due to activities such as pisciculture. Over a period of one year, combined samples of phytoplankton were made in ten stations of the reservoir. The samples were studied under a quantitative-qualitative analysis in order to obtain three ecological indexes (Shannon-Weiver, Pielou and Whilm and Dorris) to establish the level of water pollution. An Analysis of Variance was applied to determine if there is any statistical fluctuation in the number of individuals per milliliter between stations or months. The results suggest that the Betania reservoir is going through an eutrophication process according to the organisms observed in the phytoplankton community. This process increases when rain decreases, concurrent with fish mortality episodes. It is necessary to take appropriate management measures in order to preserve the useful life of the reservoir.

- by David Bruce Conn
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- Zoology, Aquatic Ecology, Conservation Biology, Freshwater Biology

Se presenta por vez primera la caracterización de la comunidad del zooplancton limnético del Lago Fortuna, Provincia de Chiriquí. Muestreas en tres zonas (Quebrada Arena, Río Hornito y Sitio de Presa) fueron tomadas en el mes de noviembre de 2001. El plancton se obtuvo mediante arrastres superficiales con redes estándar de 80 y 300 micras. Se determinaron in situ los siguientes parámetros ambientales del agua: temperatura, oxígeno disuelto, transparencia, y pH. Ocho especies de zooplancton limnético (un copépodo ciclopoideo, tres pulgas de agua o cladóceros: Diaphanosoma brachyurum, Ceriodaphnia cornuta, y Pseudosida bidentata, y cuatro rotíferos: Brachionus spp. y Keratella sp.) fueron los más abundantes hacia el Sitio de Presa. La calidad de las aguas de Fortuna presentó parámetros variables con una transparencia promedio de 2.0 m, oxígeno disuelto mayores a 4.0 p.p.m. hasta los 15 m, y temperatura de 16.0-19.0 oC. La comunidad acuática estuvo representada por un grupo variado de aves(4), mamíferos(1), peces(5), macroinvertebrados(3) y diatomeas(39).

- by Humberto Garcés B.
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- Limnology, Zooplankton ecology, Panama, Composition

The species composition and biomass of zooplankton in lake Gölbaşı (Hatay, Türkiye). The zooplanktonic fauna of lake Gölbaşı was investigated in samples collected from 2 stations between May, 2001, and April, 2002. The zooplankton of lake Gölbaşı consist mainly of Cladocera, Copepoda and Rotifera groups. A total of 27 species composed of 2 Cladocerans, 2 Copepoda and 23 rotifers were identified. During the 1-year study period, the most dominant group was Rotifera. The highest number of Rotifera were observed in second station in May, 2001. Although the species belonging to Copepoda were found, except in some months, Cladocera species were only observed in the first station, November 2001. Rotifera had the highest biomass in second station in May, 2001. Lake Gölbaşı has mesotrophic-eutrophic characteristics due to the seasonal distribution of zooplanktonic organisms. However, the lake has mesotrophic characteristics due to the eutrophication index value. As a result, it will be necessary to conduct further physical and chemical analyses of the lake water to obtain more detailed information about the trophic status of the lake.

- by Zühtü Mete Dinler
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- Biomass, Zooplankton ecology, Aquaculture, Tropical forest biomass