Genotypic differences in phosphorus use physiology in producers (Chlamydomonas reinhardtii) and consumers (Daphnia pulex) interact to alter primary and secondary production

Lind, Patrick R.; Jeyasingh, Punidan D.

doi:10.1007/s10682-015-9760-0

Cited by 10 publications

(8 citation statements)

References 30 publications

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“…Even so, other studies with controlled diets have found no relationship between somatic composition and excretion at the intraspecific level (e.g. El‐Sabaawi et al ., ; Lind & Jeyasingh ), indicating that the strong relationships between somatic composition and excretion evident at the interspecific level may not hold (Jeyasingh et al ., ). We were also unable to measure nutrient excretion on individuals in native stream water immediately after capture, because H 2 S interfered with the accuracy of our measurement methods.…”

Section: Discussionmentioning

confidence: 99%

Using replicated evolution in extremophile fish to understand diversification in elemental composition and nutrient excretion

et al. 2015

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Summary Ecological sources of selection are key drivers of evolutionary change in populations. Information on the ecological relevance of such evolutionary shifts is comparatively sparse and has received renewed interest. The framework of ecological stoichiometry is useful to investigate the reciprocal effects between ecology and evolution, because data on somatic stoichiometry of ancestral and descendent populations can be used to predict ecological functions, such as nutrient recycling, using mass balance‐based models. Here, we investigated whether divergent populations of livebearing fishes (genus Poecilia) have diverged in elemental composition. We tested whether adaptation to local environmental conditions is manifested in changes of somatic stoichiometry by measuring carbon (C), nitrogen (N), phosphorus (P) and sulphur (S) contents of wild‐caught individuals inhabiting sulphidic (extreme) and non‐sulphidic (benign) habitats. We also attempted to isolate the sources (i.e. genetic, environmental and their interaction) of intraspecific variation in stoichiometry. Finally, we tested whether shifts in somatic stoichiometry impinge on the rates at which key nutrients (N and P) are excreted. We found significant differentiation in somatic stoichiometry between fish from the two different habitat types in two of three river drainages, with fish from sulphidic habitats having lower C but higher P and S contents. Even though there was evidence for temporal variation and plasticity in elemental composition, differences between sulphidic and non‐sulphidic populations in P and S contents were maintained in laboratory populations over multiple generations. Finally, some sulphidic and non‐sulphidic population pairs differed in the rates of N and P excretions, although excretion rates were not related to somatic stoichiometry. Together, these results show that the elemental composition of organisms appears to have the characteristics typically observed in the evolution of biochemical, physiological and morphological traits. Studying taxa that have undergone replicated evolution illuminate some of the evolutionary mechanisms that drive variation in somatic elemental composition. Applying stoichiometric principles to such variation, as we have performed here, is a useful, yet underutilised approach to understand the ecological relevance of evolutionary change.

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Section: Discussionmentioning

confidence: 99%

Using replicated evolution in extremophile fish to understand diversification in elemental composition and nutrient excretion

et al. 2015

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“…Our experimental design follows a completely factorial response surface defined by three genotypes, two food conditions (standard food level = 2 × 10 5 cells/mL and high food level = 5 × 10 5 cells/ml), and nine metal treatments defined by the three concentrations each of Cu and Cd and their combinations. This standard food level has been used for more than a decade with these genotypes (Beckerman et al 2010;Dennis et al 2011;Lind and Jeyasingh 2015;Reger et al 2018).…”

Section: Experimental Designmentioning

confidence: 99%

Evaluating additive versus interactive effects of copper and cadmium on Daphnia pulex life history

Sadeq

Beckerman

2019

Environ Sci Pollut Res

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A key challenge of standard ecotoxicological risk assessment is to predict the sub-lethal risk of multiple contaminants on aquatic organisms. Our study assessed the sub-lethal mixture toxicity of copper (Cu) and cadmium (Cd) on Daphnia pulex and included manipulations of food level and assessment of three genotypes. We investigated the interaction between essential (Cu) and non-essential (Cd) metals on ingestion rate, reproduction, maturation time, size at maturity and somatic growth rate of three D. pulex genotypes, over 21 days and under standard and high food conditions. We explored the potential interaction of the metals on ingestion and life history by implementing a response surface experimental design combining control and two levels of Cu and Cd and their combinations. Overall, both metals reduced ingestion rates, reduced reproduction, delayed maturation, reduced body size at maturity and lowered somatic growth rate. Our results further indicated pervasive interactions between the metals; numerous instances where the effects of each metal were nonlinear; the effect of a metal varied by D. pulex food levels (ingestion rate and size at maturity), and the effect of a metal varied by genotypes (reproduction). Apart from the maturation time and somatic growth rate, our results suggest that life history traits are affected in non-additive ways by three factors that are often discussed and rarely estimated together: mixtures of metals, genotypes and resource levels. Our data that are derived from exposing daphnids to two metals highlight how metals interact with each other and the context of food resource and genetic variation. While interactions make it harder to generate predictions, and ultimately water quality regulations about the effects of metals, those detected in this study appear to be tractable.

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“…Ecological stoichiometry posits that animals maintain relatively constant elemental composition, i.e., are homeostatic (Sterner & Elser, ), but there is growing evidence for significant intraspecific, intrapopulation, and intraindividual (i.e., ontogenetic) variability in stoichiometric traits. Intraspecific variability can originate from a combination of both genetic and environmental effects (El‐Sabaawi, Kohler, et al., ; Lind & Jeyasingh, ). Within individuals, stoichiometric traits can vary based on the balance between nutrient demand and availability throughout ontogeny (Boros, Saly, & Vanni, ).…”

Section: Introductionmentioning

confidence: 99%

Stoichiometric traits of stickleback: Effects of genetic background, rearing environment, and ontogeny

Leal

Best

Durston

et al. 2017

Ecology and Evolution

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Phenotypes can both evolve in response to, and affect, ecosystem change, but few examples of diverging ecosystem‐effect traits have been investigated. Bony armor traits of fish are good candidates for this because they evolve rapidly in some freshwater fish populations, and bone is phosphorus rich and likely to affect nutrient recycling in aquatic ecosystems. Here, we explore how ontogeny, rearing environment, and bone allocation among body parts affect the stoichiometric phenotype (i.e., stoichiometric composition of bodies and excretion) of threespine stickleback. We use two populations from distinct freshwater lineages with contrasting lateral plating phenotypes (full vs. low plating) and their hybrids, which are mostly fully plated. We found that ontogeny, rearing environment, and body condition were the most important predictors of organismal stoichiometry. Although elemental composition was similar between both populations and their hybrids, we found significant divergence in phosphorus allocation among body parts and in phosphorus excretion rates. Overall, body armor differences did not explain variation in whole body phosphorus, phosphorus allocation, or phosphorus excretion. Evolutionary divergence between these lineages in both allocation and excretion is likely to have important direct consequences for ecosystems, but may be mediated by evolution of multiple morphological or physiological traits beyond plating phenotype.

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Genotypic differences in phosphorus use physiology in producers (Chlamydomonas reinhardtii) and consumers (Daphnia pulex) interact to alter primary and secondary production

Cited by 10 publications

References 30 publications

Using replicated evolution in extremophile fish to understand diversification in elemental composition and nutrient excretion

Using replicated evolution in extremophile fish to understand diversification in elemental composition and nutrient excretion

Evaluating additive versus interactive effects of copper and cadmium on Daphnia pulex life history

Stoichiometric traits of stickleback: Effects of genetic background, rearing environment, and ontogeny

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