Calcium balance in <i>Daphnia</i> grown on diets differing in food quantity, phosphorus and calcium

He, Xuejia; Wang, Wen‐Xiong

doi:10.1111/j.1365-2427.2009.02255.x

Cited by 11 publications

(8 citation statements)

References 31 publications

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“…Elemental limitation resulted in large changes in consumer body stoichiometry and growth rates in animals grown across nutrient gradients. Our results confirm previous daphnid studies showing changes in body Ca and P content in animals grown under low nutrient supplies (He and Wang 2009;Tan and Wang 2009). However, we found that dietary P was the most significant variable controlling daphnid elemental content, explaining the majority of variation in consumer body Ca : P ratios.…”

Section: Discussionsupporting

confidence: 92%

Effects of calcium and phosphorus limitation on the nutritional ecophysiology ofDaphnia

2015

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Declines in environmental calcium (Ca) and phosphorus (P) concentrations have occurred over the past 30 yrs in lakes across the Canadian Shield in southern Ontario, and these reductions appear to be placing strong constraints on populations of Daphnia in this region. Here, we report results from a factorial manipulation of Ca concentrations and food P content under controlled laboratory conditions where we measured resulting changes in daphnid elemental content, individual growth and survival, and life history traits related to population growth. We found significant effects of Ca‐ and P‐limitation on all variables measured; however, dietary P explained a majority of the variation in daphnid nutrient content and growth. Dietary effects of low P [high food carbon (C): P ratios] on individual Daphnia life‐history traits also translated into significant population level effects. Dietary P also explained relatively more experimental variation in population level responses than Ca concentrations. Experimental Ca concentrations most strongly altered daphnid survival partly due to the use of a lethally low Ca concentration in our experiment. Although recent work examining shifts in zooplankton communities in this region mainly focuses on the effects of Ca‐limitation, we show that Ca concentrations and food nutrient content, at levels commonly found on the Canadian Shield, are both likely to strongly alter Daphnia life‐history and populations dynamics. Our results underscore the need to more fully examine how multielemental limitation (e.g., Ca, N, P) affects consumer physiology and life‐history given the plausible translation of these effects on the community structure of lake zooplankton.

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Section: Discussionsupporting

confidence: 92%

Effects of calcium and phosphorus limitation on the nutritional ecophysiology ofDaphnia

2015

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“…The 20 study lakes have been sampled for water chemistry parameters and zooplankton since 2002 [7,20], and represent similar large gradients in environmental conditions as a broader 70-lake survey that was conducted in August 2004 [7,13]. Yet in comparison to the previous study, lakes were deeper (> 3 m maximum depth), providing a well defined pelagic area that is important for a diverse fish community [23,24], and calcium concentrations remained above 10 mg L -1 , avoiding potentially confounding affects of low species diversity due to calcium limitation [25,26], [13]. …”

Section: Methodsmentioning

confidence: 85%

Interactive effects of chemical and biological controls on food-web composition in saline prairie lakes

Cooper

Wissel

2012

Aquat Biosyst

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Salinity is restricting habitatability for many biota in prairie lakes due to limited physiological abilities to cope with increasing osmotic stress. Yet, it remains unclear how salinity effects vary among major taxonomic groups and what role other environmental parameters play in shaping food-web composition. To answer these questions, we sampled fish, zooplankton and littoral macroinvertebrates in 20 prairie lakes (Saskatchewan, Canada) characterized by large gradients in water chemistry and lake morphometry. We showed that salinity thresholds differed among major taxonomic groups, as most fishes were absent above salinities of 2 g L-1, while littoral macroinvertebrates were ubiquitous. Zooplankton occurred over the whole salinity range, but changed taxonomic composition as salinity increased. Subsequently, the complexity of fish community (diversity) was associated with large changes in invertebrate communities. The directional changes in invertebrate communities to smaller taxa indicated that complex fish assemblages resulted in higher predation pressure. Most likely, as the complexity of fish community decreased, controls of invertebrate assemblages shifted from predation to competition and ultimately to productivity in hypersaline lakes. Surprisingly, invertebrate predators did not thrive in the absence of fishes in these systems. Furthermore, the here identified salinity threshold for fishes was too low to be a result of osmotic stress. Hence, winterkill was likely an important factor eliminating fishes in low salinity lakes that had high productivity and shallow water depth. Ultimately, while salinity was crucial, intricate combinations of chemical and biological mechanisms also played a major role in controlling the assemblages of major taxonomic groups in prairie lakes.

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“…The elemental food composition (estimated as C:P ratio) is an important factor influencing the performance of cladocerans . Sensitivity of daphnids to nutritional levels expressed as algae phosphorus content was described at the physiological level (growth rate , reproduction ) and at the biochemical level (calcium balance ). Yet the effect of the algal phosphorus concentration on the toxicity of chemicals to daphnids has been studied for only a few compounds: herbicide WeatherMAX Roundup (referred as concentration of glyphosate ) and antibiotic fluoxetine .…”

Section: Introductionmentioning

confidence: 99%

Impact of imidacloprid on Daphnia magna under different food quality regimes

Ieromina

Peijnenburg

Snoo

et al. 2014

Enviro Toxic and Chemistry

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Aquatic ecosystems are characterized by fluctuating conditions that have direct effects on aquatic communities but also indirect influences such as changing the toxicity of chemicals. Because the effect of food quality on pesticide toxicity has rarely been studied, in the present study Daphnia magna juveniles supplied with 4 different food quality levels were exposed to a range of imidacloprid concentrations for 21 d. Food quality was expressed as carbon:phosphorus ratios of algae Pseudokirchneriella subcapitata (C:P 35, C:P 240, C:P 400, and C:P 1300). Survival, growth rates, and reproduction of D. magna were monitored, and the combined effects of imidacloprid exposure and the phosphorus content of algae were analyzed. A stronger effect on survival was observed at the P-deficient diet (C:P 1300), confirmed by lower 10% effect concentration (EC10) values at days 7, 9, 15, and 21 compared with diets with higher phosphorus contents. Similarly, the growth rate was reduced when D. magna were supplied with algae of low phosphorus content at imidacloprid exposure conditions. The highest reproductive output was observed for D. magna fed the optimal phosphorus diet (C:P 240), both at control and exposed conditions. Poor food quality increased the sensitivity of nontarget species to pesticide exposure, potentially leading to an underestimation of adverse effects on aquatic communities in the field.

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Calcium balance in Daphnia grown on diets differing in food quantity, phosphorus and calcium

Cited by 11 publications

References 31 publications

Effects of calcium and phosphorus limitation on the nutritional ecophysiology ofDaphnia

Effects of calcium and phosphorus limitation on the nutritional ecophysiology ofDaphnia

Interactive effects of chemical and biological controls on food-web composition in saline prairie lakes

Impact of imidacloprid on Daphnia magna under different food quality regimes

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