F. Gregersen

TL;DR: This study shows that genetically based phenotypic divergence can prevail even under conditions of low genetic variation and ongoing gene flow, and that population-specific maximum development temperatures along with musculoskeletal developmental trade-offs may constrain adaptation.

TL;DR: It is demonstrated that the number of crypt cells in the olfactory epithelium of the crucian carp varies dramatically throughout the year, which may explain previous studies demonstrating a relationship between circulating androgen and Olfactory sensitivity to sex pheromones.

TL;DR: Testing whether evolutionary changes in stickleback morphology are consistent with adaptations to physical parameters such as lake depth, lake area, lake perimeter and shoreline complexity found only weak indications of adaptation, indicating that evolutionary constraints may have played a role in structuring phenotypic variation across freshwater populations of sticklebacks.

TL;DR: This study documents divergence in egg size that has occurred over less than 25 generations among sympatric demes of European grayling from Lake Lesjaskogsvatnet in Norway and suggests high temperatures (increased metabolism) to reinforce the selective advantage of large eggs under conditions with highly density-dependent fry interactions.

TL;DR: The data are consistent with the density-dependent hypothesis and suggest that reproductive investment can diverge over small geographic distances, potentially in response to environments favouring greater investment in offspring quality.