Convergent life-history shifts: toxic environments result in big babies in two clades of poeciliids

  title={Convergent life-history shifts: toxic environments result in big babies in two clades of poeciliids},
  author={R{\"u}diger Riesch and Martin Plath and Francisco de Leon and Ingo Schlupp},
The majority of studies on ecological speciation in animals have investigated the divergence caused by biotic factors like divergent food sources or predatory regimes. Here, we examined a system where ecological speciation can clearly be ascribed to abiotic environmental gradients of naturally occurring toxic hydrogen sulfide (H2S). In southern Mexico, two genera of livebearing fishes (Poeciliidae: Poecilia and Gambusia) thrive in various watercourses with different concentrations of H2S… CONTINUE READING
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