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Inter‐population ovarian fluid variation differentially modulates sperm motility in Atlantic cod Gadus morhua
Author(s) -
Beirão J.,
Purchase C. F.,
Wringe B. F.,
Fleming I. A.
Publication year - 2015
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.12685
Subject(s) - gadus , biology , atlantic cod , sperm , population , gadidae , zoology , sperm motility , ecology , fishery , genetics , fish <actinopterygii> , demography , sociology
This study tested the hypothesis that the effects of Atlantic cod Gadus morhua ovarian fluid on sperm motility variables are population specific. Sperm from a northern G. morhua population were activated in the presence of ovarian fluid from either northern or southern G. morhua at different concentrations. Ovarian fluid acted as a filter, in some cases reducing sperm swimming performance compared with seawater. Fluid from females foreign in population (southern) to the males (northern) had a greater inhibiting effect than those from the native population. Follow‐up analysis indicated that the ovarian fluids had lower Ca 2+ concentration in northern than southern G. morhua , which could be the causative mechanism. If widespread, such cryptic female choice could reduce the incidence of intraspecific hybridization among diverged populations and contribute to reproductive isolation.