Model
Digital Document
Publisher
Florida Atlantic University
Description
Two gynogenetically reproducing unisexuals, the diploid Poecilia
formosa and its associated triploid are sympatric to P. mexicana, a
bisexual species, in northeastern Mexico. All compete for sperm from
P. mexicana males. Field and laboratory experiments studied habitat.
preferences and associations as mechanisms of reducing competition. A
new tagging method was developed.
Laboratory results (Phase One) indicated habitat preferences of
each female type. Further studies (Phase Two) showed the fishes remained
together but each female type associated with its own kind. Shade and a
gravel substrate were important habitat parameters.
Specific habitat preferences may not be adaptive due to seasonal
water fluctuations but there are different ecological preferences by each
female type. Associations could account for Phase One laboratory results
and ecological differences. Combined data indicate associations are the
likely mechanism, but habitat preferences are possible. Seasonal factors
and artificial conditions may have caused diverse results.
formosa and its associated triploid are sympatric to P. mexicana, a
bisexual species, in northeastern Mexico. All compete for sperm from
P. mexicana males. Field and laboratory experiments studied habitat.
preferences and associations as mechanisms of reducing competition. A
new tagging method was developed.
Laboratory results (Phase One) indicated habitat preferences of
each female type. Further studies (Phase Two) showed the fishes remained
together but each female type associated with its own kind. Shade and a
gravel substrate were important habitat parameters.
Specific habitat preferences may not be adaptive due to seasonal
water fluctuations but there are different ecological preferences by each
female type. Associations could account for Phase One laboratory results
and ecological differences. Combined data indicate associations are the
likely mechanism, but habitat preferences are possible. Seasonal factors
and artificial conditions may have caused diverse results.
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