Limnoperna fortunei (Dunker, 1857) (Bivalvia: Mytilidae) tolerance to temperature and pH in experimental conditions (original) (raw)
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2003
Limnoperna fortunei (Dunker, 1857) (Bivalvia, Mytilidae) was first reported from Río de La Plata in 1991; soon thereafter, it spread widely throughout the basin, causing great damage to all sorts of water supply systems. The desiccation period that young and adults can tolerate was analyzed in laboratory and outdoor experiments. L. fortunei is tolerant to desiccation. The tolerance increases with size. About 72 h was required to kill small mussels (up to 6 mm), 192 h to kill medium-sized adults (>6-15 mm) and 276 h to kill maximum-sized mussels adults (>15-27 mm) in laboratory exposures, and 72 h, 96 h and 108 to kill small, medium-sized and maximum sized mussels in outdoor exposures. The results have implications for using desiccation to combat the spread of L. fortunei.
Journal of Limnology, 2017
Limnoperna fortunei (Dunker 1857) is a freshwater mussel with physiological tolerance to different environmental conditions, which may explain its success as an invasive species. The role of abiotic factors in its establishment, abundance and projections of risk of further spread into several areas has been studied. These mussels may respond to multiple environmental stressors, such as temperature, through physiological mechanisms, behavioral responses, mortality or some combination of these. The aim of this study was to investigate the behavioral responses (valve closing), glycogen concentrations and mortality of L. fortunei under four different temperatures (5°C, 10°C, 20°C and 30°C) during a chronic test (30 days). Two-way analysis of variance (ANOVA) was used to compare glycogen concentrations across days of the experiment and at the different temperatures. Differences in valve-closing behavior and mortality among temperatures were tested using repeated-measures ANOVA. We observ...
Brazilian Archives of Biology and Technology, 2009
The golden mussel (Limnoperna fortunei, Mollusca: Bivalvia) is an invasive species that has been causing considerable environmental and economic problems in South America. In the present study, filtration rates of L. fortunei were determined in the laboratory under different temperatures (10, 15, 20, 25, 28, and 30 ºC) and two types of food (Algamac2000® and the chlorophycean alga Scenedesmus sp.). There was a statistically significant relationship between time and filtration rates in the experiment using Scenedesmus sp., regardless of temperature. However, this pattern was absent in the experiment using Algamac, suggesting that the relationship between filtration rates and temperature might depend on the size of the filtered particles. In addition, there was no correlation between filtration rates and either shell size or condition index (the relationship between the weight and the length of a mussel). The filtration rate measured in the present study (724.94 ml/h) was one of the highest rates recorded among invasive bivalves to date. Given that the colonies of the golden mussel could reach hundreds of thousands of individuals per square meter, such filtration levels could severely impact the freshwater environments in its introduced range.
Hydrobiologia, 2020
This work evaluates the tolerance of adult Limnoperna fortunei to aerial exposure at different temperatures. The aim was to contribute knowledge about factors, such as the mussel's capacity for survival out of water over long periods, allowing the invasion of new environments after terrestrial transport. The analysis of the results revealed that the time of exposure to air influenced mortality at different temperatures throughout the experimental period (P \ 0.001). The time to reach 100% mortality at temperatures of 10°C, 20°C, and 30°C were 11, 6, and 3 days, respectively. Mussel mortality outside the water is directly related to air temperature, so the higher the temperature is, the greater the mortality. The results suggest that in the case of the land transport of structures biofouled with L. fortunei, this species can remain alive for 2 to 10 days, depending on the ambient temperature. Thus, aerial exposure may be used as a strategy to control the dispersal of the golden mussel. However, the time required for effective elimination of all individuals depends on the air temperature. The aerial exposure can also be used to periodically clean industrial systems and to eliminate
Brazilian journal of biology = Revista brasleira de biologia, 2017
Successful animal rearing under laboratory conditions for commercial processes or laboratory experiments is a complex chain that includes several stressors (e.g., sampling and transport) and incurs, as a consequence, the reduction of natural animal conditions, economic losses and inconsistent and unreliable biological results. Since the invasion of the bivalve Limnoperna fortunei (Dunker, 1857) in South America, several studies have been performed to help control and manage this fouling pest in industrial plants that use raw water. Relatively little attention has been given to the laboratory rearing procedure of L. fortunei, its condition when exposed to a stressor or its acclimation into laboratory conditions. Considering this issue, the aims of this study are to (i) investigate L. fortunei physiological responses when submitted to the depuration process and subsequent air transport (without water/dry condition) at two temperatures, based on glycogen concentrations, and (ii) monito...
Journal of Experimental Marine Biology and Ecology, 2007
The brackish water mussel, Mytilopsis leucophaeata, is a rapidly expanding invasive bivalve in Europe with great biofouling capacities. Being a typical brackish water species with very broad habitat preferences and environmental limits, adults are extremely tolerant to fluctuations in temperature and salinity. The life cycle of mussels however, consists of two phases: (1) from fertilization until larval settlement they are pelagic, only protected by a larval soft shell and (2) after settlement, the individuals become benthic and develop a hard mytiliform shell. The fact that adult mussels can close their protective valves is the major reason why they are important fouling species and are difficult to remove once settled. Therefore, vulnerability of different larval life stages of M. leucophaeata to temperature and salinity was investigated during standardized acute 48 h experimental tests. In addition, the survival limits of the most vulnerable larval life stage were determined at different temperature-salinity combinations. Results indicated that larval stages show a differential vulnerability: 4 h old embryos were more vulnerable to changes in temperature and salinity than 2 day old larvae. Maximal survival of 4 h old embryos was found at 22°C at salinity 15. Surrounding this optimum, conditions stayed good for survival in a rather wide range: only salinities of 0 and 25 and temperatures below 10°C or above 30°C caused high embryonic mortality. Thus, even the most vulnerable larval stage in the life cycle of M. leucophaeata can be considered highly resistant to environmental conditions. Considering the broad environmental limits of adult as well as larval M. leucophaeata, we can expect this species to appear many brackish water bodies worldwide, with only colder regions potentially limiting its invasion success.
Acta Limnologica Brasiliensia, 2011
AIM: The present study involved an analysis of the monthly variations in the population densities and body sizes of the different stages of planktonic larvae of the invasive golden mussel (Limnoperna fortunei), in the rivers Paraguay and Miranda; METHODS: The study was carried out between February 2004 and January 2005. Monthly collection of the plankton samples was accompanied by physical, chemical and biological analyses of the water; RESULTS: The Miranda River presented higher values of calcium, pH, alkalinity, conductivity and total phosphorous. Larval density varied from 0-24 individuals.L-1 in the Paraguay River, with a peak in March of 2004, while in the Miranda River, densities varied between 0-9 individuals.L-1 with a peak in February of 2004. No larvae were encountered during the coldest months, May and June. No significant correlations were found between environmental variables and larval density in either river. Only the valved larval stages were recorded. The "D&qu...
Hydrobiologia, 2005
Clearance rates of Limnoperna fortunei (Bivalvia) were investigated in laboratory experiments using monocultures of the alga Chlorella vulgaris. Experimental conditions included two mollusc sizes (15 and 23 mm), and three water temperatures (15, 20 and 25°C) covering the normal seasonal range in the lower Parana´river and Rı´o de la Plata estuary. Filtration rates obtained were, for the larger mussels: 9.9, 13.1 and 17.7 ml mg tissue dry weight À1 h À1 at 15, 20 and 25°C, respectively; and for the smaller ones: 17.7, 20.8 and 29.5 ml mg À1 h À1. Differences between sizes and between temperatures (except 15 vs. 20°C) were statistically significant. In absolute terms larger animals have higher clearance rates, but as a function of body mass smaller individuals feed more actively. Within the range of experimental values used, filtration rates were positively associated with water temperature. These clearance rates (125-350 ml individual À1 h À1) are among the highest reported for suspension feeding bivalves, including the invasive species Dreissena polymorpha, D. bugensis and Corbicula fluminea. High filtration rates, associated with the very high densities of this mollusc in the Parana´watershed (up to over 200,000 ind m À2) suggest that its environmental impact may be swiftly changing ecological conditions in the areas colonized.