The influence of water on reproductive success and chemical composition of laboratory reared populations of Daphnia magna

Cowgill, U. M.; Emmel, Herbert W.; Hopkins, Daniel L.; Applegath, SL; Takahashi, I. T.

doi:10.1016/0043-1354(86)90079-5

Cited by 40 publications

(23 citation statements)

References 10 publications

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“…These chitinous exoskeletons are periodically shed and regenerated. Most of the body Ca is lost during each moult, requiring subsequent regeneration from the ambient water (Cowgill et al 1986;Alstad et al 1999). The importance of ambient Ca concentration has been demonstrated both in surveys of crustacean zooplankton distributions in Scandinavia and cladoceran sedimentary assemblages in Ontario, where Ca concentration is a significant factor in species occurrence and community composition (e.g., Waervågen et al 2002;DeSellas et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Crustacean zooplankton sedimentary remains from calcium-poor lakes: complex responses to threshold concentrations

2011

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Declines in lakewater calcium (Ca) concentrations are occurring in many softwater lakes of the Canadian Shield, and likely elsewhere, and there is growing interest regarding the potential impacts that reduced Ca availability may have on aquatic ecosystems. Here, we test the hypotheses that the Ca limitations of Daphnia pulex (reduced growth/survival when Ca \1.5 mg L -1 ) identified in laboratory analyses and paleolimnological case studies can be observed among cladoceran assemblages from surface sediments along a narrow Ca gradient (1-3 mg L -1 ), and also whether the impacts of low Ca concentrations can be distinguished from those of low lakewater pH. Significant differences among daphniid communities were observed across the 1.5 mg L -1 Ca threshold; however, these differences did not extend to the broader cladoceran community and considerable variability in Ca tolerance was observed within the D. pulex species complex. Of the measured environmental variables, only pH and lake depth explained a significant amount of variation among the entire cladoceran community, although when enlarging the dataset to extend the Ca and pH ranges, Ca replaced pH as a significant explanatory variable. Our data adds support to our previous observations that, within the cladoceran community, daphniids are the most responsive to Ca decline, however responses differ within daphniid species complexes and Ca thresholds under natural conditions may be higher for some species than their laboratory-identified values.

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Section: Introductionmentioning

confidence: 99%

Crustacean zooplankton sedimentary remains from calcium-poor lakes: complex responses to threshold concentrations

2011

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“…In general, pH affects Daphnia by modifying their internal ionic regulation (Potts and Fryer 1979), whereas Ca 2þ is required as an essential element (Waerva˚gen et al 2002). Any calcium lost in this process has to be replaced by uptake of calcium from the external media (Cowgill et al 1986). Any calcium lost in this process has to be replaced by uptake of calcium from the external media (Cowgill et al 1986).…”

Section: Introductionmentioning

confidence: 99%

THE ECOLOGICAL NICHE OFDAPHNIA MAGNACHARACTERIZED USING POPULATION GROWTH RATE

Hooper

Connon

Callaghan

et al. 2008

Ecology

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The concept of an organism's niche is central to ecological theory, but an operational definition is needed that allows both its experimental delineation and interpretation of field distributions of the species. Here we use population growth rate (hereafter, pgr) to define the niche as the set of points in niche space where pgr > 0. If there are just two axes to the niche space, their relationship to pgr can be pictured as a contour map in which pgr varies along the axes in the same way that the height of land above sea level varies with latitude and longitude. In laboratory experiments we measured the pgr of Daphnia magna over a grid of values of pH and Ca2+, and so defined its "laboratory niche" in pH-Ca2+ space. The position of the laboratory niche boundary suggests that population persistence is only possible above 0.5 mg Ca2+/L and between pH 5.75 and pH 9, though more Ca2+ is needed at lower pH values. To see how well the measured niche predicts the field distribution of D. magna, we examined relevant field data from 422 sites in England and Wales. Of the 58 colonized water bodies, 56 lay within the laboratory niche. Very few of the sites near the niche boundary were colonized, probably because pgr there is so low that populations are vulnerable to extinction by other factors. Our study shows how the niche can be quantified and used to predict field distributions successfully.

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“…The composition of test medium is an important environmental factor which influences the results of Daphnia magna toxicity tests (Cowgill et al, 1986). The standardization of test medium composition presents a number of difficulties.…”

Section: Introductionmentioning

confidence: 99%

Suitability of Test Media Containing EDTA for the Evaluation of Acute Metal Toxicity toDaphnia magnaStraus

Guilhermino

Diamantino

Ribeiro

et al. 1997

Ecotoxicology and Environmental Safety

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The influence of water on reproductive success and chemical composition of laboratory reared populations of Daphnia magna

Cited by 40 publications

References 10 publications

Crustacean zooplankton sedimentary remains from calcium-poor lakes: complex responses to threshold concentrations

Crustacean zooplankton sedimentary remains from calcium-poor lakes: complex responses to threshold concentrations

THE ECOLOGICAL NICHE OFDAPHNIA MAGNACHARACTERIZED USING POPULATION GROWTH RATE

Suitability of Test Media Containing EDTA for the Evaluation of Acute Metal Toxicity toDaphnia magnaStraus

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