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7 results for “Daphnia pulicaria”
Density of Acanthocyclops vernalis, Leptodiaptomus tyrelli and Daphnia pulicaria in Hidden Lake (Banff, AB, Canada) from 2014 to 2020
This data file is the combination of two data sets of two different methodology (The Derry lab and Fisher lab; see method section for differences). The density of three dominant species were assessed every summer during the same week from 2014 to 2020 by the Fisher lab in Hidden Lake, Banff National Park, Canada: the cyclopoid Acanthocyclops vernalis, the calanoid Leptodiaptomus tyrelli and the cladocera Daphnia pulicaria. An extra sampling effort was done by the Derry lab around the rotenone treatments. The objective of this study was to assess the effect of two rotenone application (in summer 2018 and 2019) on zooplankton populations.
Quantitative genetics of phosphorus content in the freshwater herbivore, Daphnia pulicaria
<p>1. Phosphorus (P) is essential for growth of all organisms, and P content is correlated with growth in most taxa. Although P content was initially considered to be a trait fixed at the species level, there is growing evidence for considerable intraspecific variation. Selection on such variation can thus alter the rates at which P fluxes through food webs.</p> <p>2. Nevertheless, prior work describing the sources and extent of intraspecific variation in P content were not genetically explicit, confounded by unknown genetic background and evolutionary history. We constructed an F2 recombinant population of the dominant freshwater grazer, Daphnia pulicaria to mitigate such issues.</p> <p>3. F2 recombinants exhibited considerable variation in growth rate, P content (0.49% to 1.97%), P use efficiency (PUE; 51 to 208 mg biomass/mg P), and correlated traits such as hatching time of resting eggs, in common garden conditions.</p> <p>4. These results clearly demonstrate the scope of genetic recombination in generating variation in ecologically-relevant traits. The absence of environmental selection is a likely component driving such variation not observed in natural settings.</p> <p>5. Although phosphoglucose isomerase (PGI) genotype was significantly associated with variation in hatching time of resting eggs, contrary to prior work with less rigorous designs, allelic variation at the PGI locus did not explain variation in P content and PUE of Daphnia, indicating that such quantitative traits are under polygenic control.</p> <p>6. Together, these results suggest that although there is considerable genetic scope for variation in key ecologically-relevant traits, such as P content and efficiency of P use, these traits are likely under strong stabilizing selection, most likely due to selection on growth rate and size. Importantly, our observations suggest that anthropogenic alterations to P supply due to eutrophication could alter selection on these traits, thereby rapidly altering the role Daphnia plays in the P cycle of lakes.</p>
Evolutionary change in metabolic rate of Daphnia pulicaria following invasion by the predator Bythotrephes longimanus
<p><span>Metabolic rate is a trait that may evolve in response to the direct and indirect effects of predator-induced mortality. Predators may indirectly alter selection by lowering prey densities and increasing resource availability or by intensifying resource limitation through changes in prey behaviour (e.g. use of less productive areas). In the current study </span><span>we quantify evolution of metabolic rate in the zooplankton </span><em><span>Daphnia pulicaria</span></em><span> following an invasive event by the predator </span><em><span>Bythotrephes longimanus</span></em><span> in Lake Mendota, Wisconsin, US. This invasion has been shown to dramatically impact </span><em><span>D. pulicaria</span></em><span>, </span><span>causing a ~60% decline in their biomass. </span><span>Using a resurrection ecology approach, we compared the metabolic rate of D. pulicaria clones originating from prior to the <em>Bythotrephes</em> invasion with that of clones having evolved in the presence of <em>Bythotrephes</em>. </span><span>We observed</span><span> a 7.4% reduction in metabolic rate among post-invasive clones compared to pre-invasive clones, and discuss the potential roles of direct and indirect selection in driving this change. </span></p>
Evolutionary change in metabolic rate of Daphnia pulicaria following invasion by the predator Bythotrephes longimanus
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Quantitative genetics of phosphorus content in the freshwater herbivore, Daphnia pulicaria
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Data from: Correlated responses to clonal selection in populations of Daphnia pulicaria: mechanisms of genetic correlation and the creative power of sex
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Identifying genes and pathways that respond differently to dietary C:P between old (~700-yr-old) and young (~10-yr-old) resurrected Daphnia pulicaria genotypes that differ in C and P physiology
GEO Series GSE48232. Daphnia pulex. 24 samples. Type: Expression profiling by array.
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