The extraordinary species richness of freshwater fishes has attracted much research on
mechanisms and modes of speciation. We here review research on speciation in freshwater …

Organisms adapted to physiochemical stressors provide ideal systems to study evolutionary
mechanisms that drive adaptation and speciation. This review study focuses on livebearing …

Evidence of phenotypic parallelism is often used to infer the deterministic role played by
natural selection. However, variation in the extent or direction of divergence is often evident …

Extreme environments test the limits of life; yet, some organisms thrive in harsh conditions.
Extremophile lineages inspire questions about how organisms can tolerate physiochemical …

Hydrogen sulfide (H2S) is a potent toxicant interfering with oxidative phosphorylation in
mitochondria and creating extreme environmental conditions in aquatic ecosystems. The …

Ecological Studies is Springer's premier book series treating all aspects of ecology. These
volumes, either authored or edited collections, appear several times each year. They are …

Hydrogen sulfide is a toxic gas that disrupts numerous biological processes, including
energy production in the mitochondria, yet fish in the Poecilia mexicana species complex …

Accurately delimiting species is fundamentally important for understanding species diversity
and distributions and devising effective strategies to conserve biodiversity. However …

Replicated ecological gradients are prime systems to study processes of molecular
evolution underlying ecological divergence. Here, we investigated the repeated adaptation …

The subgenus Mollienesia is a diverse group of freshwater fishes, including species that
have served as important models across multiple biological disciplines. Nonetheless, the …