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- W2040971489 abstract "The swimming behaviour of adult Daphnia largely governs their depth, which has a direct effect on both individual foraging success and predation avoidance. We treated individual swimming behaviour as a threshold character and used directional changes in average clonal depth within experimental tubes as a test for character plasticity. We compared the swimming behaviours of two cohabiting, phenotypically similar Daphnia (Daphnia galeata and Daphnia galeata–Daphnia rosea hybrid) to determine (1) whether there is inherited variation (H2) for different traits (responses to hunger and predator cues); (2) whether changes in genetic parameters (norm of reaction and character state) across four environments could be simulated by combinations of the presence or absence of a predator cue and high or low hunger levels; and (3) whether these Daphnia would respond to directional selection, particularly in a trade-off environment (high hunger and predator cue treatments). Responses of both D. galeata and theD. galeata –rosea hybrid to hunger and a predator cue and the trade-off environment were plastic.Daphnia galeata expressed significant genetic variation within (H2) and between environments (heritability of plasticity). Both the character state and norm of reaction estimates of heritable variation in the hybrid were close to zero. Genetic correlations were positive and stable across six environmental pairs in Daphnia galeata. Most hybrid genetic correlations were not significant. The phenotypic distributions of both D. galeata and the hybrid were bimodal in the trade-off environment. The D. galeata distribution was partly due to between-clone variation and the hybrid distribution was almost entirely due to within-clone variation. Genetic variation expressed byD. galeata in the trade-off environment appears to depend on both clone by environment interactions and stable inherited differences. These results indicate that while plastic phenotypic responses cause a similar opportunity for selection inD. galeata and the hybrid, their responses to selection would be different in the trade-off and in related environments." @default.
- W2040971489 created "2016-06-24" @default.
- W2040971489 creator A5050637219 @default.
- W2040971489 creator A5056015940 @default.
- W2040971489 date "2000-05-01" @default.
- W2040971489 modified "2023-09-29" @default.
- W2040971489 title "Behaviour plasticity without learning: phenotypic and genetic variation of naı̈ve Daphnia in an ecological trade-off" @default.
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- W2040971489 doi "https://doi.org/10.1006/anbe.1999.1386" @default.
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