Journal Article

Translocation of cave fish (Poecilia mexicana) within and between natural habitats along a toxicity gradient

Schlupp, I., Colston, T. J., Joachim, B. L. and Riesch, R.

Record Number:
2996
Year:
2013
Journal:
Ecology of Freshwater Fish
Pages:
228-233
Volume:
22
Short Title:
Translocation of cave fish (Poecilia mexicana) within and between natural habitats along a toxicity gradient
Alternate Journal:
Ecol Freshw Fish
Notes:
108hk
URL:
://WOS:000316283000006
Date:
Apr
Accession Number:
WOS:000316283000006
Language:
English
Issue:
2
Abstract:
During ecological speciation, diverging taxa have the potential to remain in close spatial proximity (i.e., sympatry or micro-allopatry) theoretically allowing for continued contact and gene flow. In a system where incipient speciation of populations of the Atlantic molly (Poecilia mexicana) appears to be driven by abiotic factors, we investigated whether one of these factors, hydrogen sulphide (H2S) toxicity, also constitutes an effective barrier to slow migration within and between habitats. We addressed this experimentally by translocating individuals from high toxicity to lower toxicity within a toxic cave and by translocating individuals from the toxic cave to a nontoxic surface habitat. Using a stepwise-backwards Cox regression, we found that overall mortality was low, but statistically significant mortality occurred when individuals were transferred from higher toxicity to lower toxicity. In addition, only males were negatively affected by being transferred from low levels of toxicity to nontoxic, surface waters. This indicates that in addition to abiotic factors, other mechanisms, like predation and sexual selection, must be important in maintaining population separation.
ISSN:
0906-6691
Times Cited:
1
Author Address:
Univ Oklahoma, Dept Biol, Norman, OK 73019 USA
Related Records:
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