Relationship between the energy status of Daphnia magna and its sensitivity to environmental stress

Smolders, Roel; Baillieul, Marc; Blust, Ronny

doi:10.1016/j.aquatox.2005.03.006

Cited by 74 publications

(34 citation statements)

References 50 publications

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“…In the freshwater cladoceran, Daphnia magna, a threshold response, as a decrease in survival, growth and reproduction when salinity levels increased above 6·g·l -1 (~8.8·mS·cm -1 ), was observed (Smolders et al, 2005). However, in an investigation of sub-lethal salinity tolerance, growth in the freshwater gastropod Physa acuta was observed to be lower in low (р0.05·mS·cm -1 ) and high (>1.0·mS·cm -1 ) salinities than in intermediate salinities (Kefford and Nugegoda, 2005).…”

Section: Introductionmentioning

confidence: 99%

Sub-lethal and chronic salinity tolerances of three freshwater insects: Cloeon sp. and Centroptilum sp. (Ephemeroptera: Baetidae)and Chironomus sp. (Diptera: Chironomidae)

Hassell

Kefford

Nugegoda

2006

Journal of Experimental Biology

119

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Section: Introductionmentioning

confidence: 99%

Sub-lethal and chronic salinity tolerances of three freshwater insects: Cloeon sp. and Centroptilum sp. (Ephemeroptera: Baetidae)and Chironomus sp. (Diptera: Chironomidae)

Hassell

Kefford

Nugegoda

2006

Journal of Experimental Biology

119

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“…The authors speculated that this increased sensitivity was the result of a change in life history from emphasizing survival at low food supply to emphasizing reproduction at high food supply. The studies by Pieters and Liess (2006) and Smolders et al (2005) clearly show that different testing conditions may have a profound impact on the outcome of standard toxicity testing and that this outcome may not be consistent with generally accepted hypotheses.…”

Section: Environmental Factors Of Importance For Uptake and Effectsmentioning

confidence: 99%

“…Smolders et al (2005) exposed D. magna to different food concentrations and measured energy status and scope for growth in animals exposed to a stressor (in this case increased salinities). Exposure to higher salinity significantly decreased survival and reproduction, but interestingly this decrease was more pronounced in the highest food concentrations, which shows that the high energy status of the daphnids from the high food concentrations at the start of the exposure did not provide an increased capacity to cope with additional stress.…”

Section: Environmental Factors Of Importance For Uptake and Effectsmentioning

confidence: 99%

Improving the Value of Standard Toxicity Test Data in REACH

Breitholtz

Lundström

Dahl

et al. 2010

Regulating Chemical Risks

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Worldwide, environmental risk assessment strategies are based on the assumption that measuring direct effects of single substances, using a few single species tests, in combination with safety factors correcting for extrapolation inconsistencies, can be used to protect higher levels of biological organization, such as populations and even ecosystems. At the same time, we are currently facing a range of pollution problems (Millennium Ecosystem Assessment Series 2005), of which some could at least indirectly be linked to the fact that this assumption may not be fully valid. Consequently, there is an ongoing scientific debate on whether current chemical control protocols are sufficient for protection of ecosystems, and numerous suggestions for improvements have been presented by the scientific community, e.g. alternative tests and testing strategies. On the other hand, few of these suggestions actually reach the regulatory world (or become implemented), and risk assessment today basically follows the same paradigm as 30 years ago. While the new REACH regime is exceptionally ambitious, this chapter observes several problems and gaps in this regulatory framework. We suggest measures and approaches which imply increased ecological realism and understanding in future regulatory work.

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“…Likewise, depending on the food quantity, Daphnia is also able to adjust their life history traits to optimally allocate the available resources. In low-food conditions, daphnids allocate more energy resources to self-maintenance in detriment to reproduction, while at high-food supply their investment in reproduction is favoured (Polishchuk and Vijverberg, 2005;Smolders et al, 2005). Lampert and Brendelberger (1996) also report the investment of Daphnia species in more efficient mechanisms of food collection as an adaptation to low-food concentrations (e.g., larger filter combs, mesh sizes, and appendage beat rates).…”

Section: Introductionmentioning

confidence: 99%

Short-term dynamics of cladocerans in a eutrophic shallow lake during a shift in the phytoplankton dominance

Abrantes

Nogueira

Gonçalves

2009

Ann. Limnol. - Int. J. Lim.

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-The changes in the dynamics of cladocerans in Lake Vela (Portugal), as well as the morphologic and life history traits of the small-bodied cladoceran Ceriodaphnia pulchella, were studied intensively during one month characterized by deep and fast changes in the phytoplankton community: the beginning of the cyanobacteria dominance. Lake Vela, located in the Mediterranean region, is a polymictic shallow lake exhibiting characteristics typical of an advanced trophic status, namely the permanently turbid water, the reduction in biodiversity and the occurrence of cyanobacteria blooms. The density and composition of the cladocerans populations varied considerably during the short-term period analyzed. Coincident with the increase of cyanobacteria, the density of Daphnia longispina decreased drastically, associated with an increase of Bosmina longirostris and Chydorus sp. The constant density of C. pulchella, even during the cyanobacteria dominance, and the strong relationship found between weight and size, suggests that the low quality of phytoplanktonic food in Lake Vela did not play an important role in its fitness. Besides the small size of C. pulchella, this fact could be also related to its diversified diet. Nevertheless, a closer examination of the life history parameters of C. pulchella revealed a reduction in the fecundity, size at first reproduction, mean size of ovigerous females and maximum size of the population, which suggest an increase of the fish pressure after the decline of Daphnia. C. pulchella showed also a short-life cycle and a fast turnover of individuals, which constitutes also an advantage, allowing a fast adaptive response of the population.

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Relationship between the energy status of Daphnia magna and its sensitivity to environmental stress

Cited by 74 publications

References 50 publications

Sub-lethal and chronic salinity tolerances of three freshwater insects: Cloeon sp. and Centroptilum sp. (Ephemeroptera: Baetidae)and Chironomus sp. (Diptera: Chironomidae)

Sub-lethal and chronic salinity tolerances of three freshwater insects: Cloeon sp. and Centroptilum sp. (Ephemeroptera: Baetidae)and Chironomus sp. (Diptera: Chironomidae)

Improving the Value of Standard Toxicity Test Data in REACH

Short-term dynamics of cladocerans in a eutrophic shallow lake during a shift in the phytoplankton dominance

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