Abstract Theory shows that polyandry (mating with multiple males within a reproductive season) works as bet-hedging to increase the geometric mean fitness (GMF) of polyandrous genotype over generations and avoid extinction but it was rarely tested empirically. In this study, we distributed eggs Gryllus bimaculatus females mated 1–4 treatment) into 4 petri dishes different conditions: 25 °C/fres...

The introduction of non-native fish into the Teuchitlán River, in west-central Mexico, was suggested as a key factor behind change assemblage, and even extinction endemic species. characterization assemblage relationship between abundance anthropogenic conditions were evaluatedover 2-year period. Fish structure, species replacement, dominance examined along longitudinal environmental gradient. ...