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AimSpeciation can either proceed as gradual divergence, mostly in allopatry or parapatry, or by duplication of chromosome sets: polyploidization. Hybrid‐origin or allopolyploidization is an important mechanism of hybrid speciation with strong, although often incomplete, postzygotic reproductive barriers between the polyploid hybrid and its diploid parents. Allopolyploids often present novel phenotypes...
Pesticides and other chemicals often have detrimental effects at environmental concentrations. Many amphibian species are particularly threatened because of their susceptibility but also because wetlands are often polluted. Behavioral assessments of toxicity have the advantage of showing sublethal effects but quantitative measures at varied scales of integrations are rarely considered together. In...
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