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Offspring development and life-history variation in a water flea depends upon clone-specific integration of genetic, non-genetic and environmental cues ArchiMer
Harney, Ewan; Paterson, Steve; Plaistow, Stewart J..
Theory predicts that offspring developmental strategies involve the integration of genetic, non-genetic and environmental ‘cues’. But it is unclear how cue integration is achieved during development, and whether this pattern is general or genotype-specific. In order to test this, we manipulated the maternal and offspring environments of three genetically distinct clones of the water flea Daphnia magna taken from different populations. We then quantified the effect that the genotype, maternal environment and the offspring environment had on the development and life-histories of the three different clones. Mothers responded to the same maternal environments in different ways, resulting in clone-specific maternal effects on neonate size. Offspring responses...
Tipo: Text Palavras-chave: Cue integration; Developmental plasticity; Maternal effects; Non-genetic inheritance; Probabilistic maturation reaction norm; Water flea.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00382/49370/49773.pdf
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Temporal trends in age and size at maturation of four North Sea gadid species: cod, haddock, whiting and Norway pout ArchiMer
Marty, Lise; Rochet, Marie-joelle; Ernande, Bruno.
Younger ages and smaller sizes at maturation have been observed in commercial fish stocks over the last century. We establish that age and length at 50% proportion mature (i.e. the proportion of mature individuals in a population or the probability that an individual is mature) decreased from the 1970s to the 2000s in North Sea cod Gadus morhua, haddock Melanogrammus aeglefinus and whiting Merlangius merlangus, but not in Norway pout Trisopterus esmarkii. The potential contributions of demography, phenotypic plasticity and evolution to these trends were assessed. First, maturation trends were extricated from demographic effects and growth-dependent plasticity by estimating probabilistic maturation reaction norms (PMRNs). PMRN midpoints have significantly...
Tipo: Text Palavras-chave: Probabilistic maturation reaction norm; Demography; Phenotypic plasticity; Fisheries-induced evolution; Life-history strategy; Maturity; Growth; Reproductive investment.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00180/29152/27559.pdf
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