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Daily Rhythm
Patterns Study:
The purpose of this study is to understand the symbiotic relationship
of Psilogobius mainlandi and its symbiotic snapping shrimp (Alpehus
rapax and A. rapicida) better. To date P. mainlandi
is not been found outside the Hawaiian Islands and is considered an endemic
species (Randal .... ). It is also one of only two species in its entire
genus (Baldwin ... ). Most shrimp gobies lie in one of 5 main genera:
Amblyeleotris, Cryptocentrus, Ctenogobiops, Stonogobiops, and
Vanderhorstia. In addition to the taxonomic isolation of P.
mainlandi, the isolation of the Hawaiian Islands has had a tremendous
effect on the evolution of several groups of terrestrial as well as aquatic
species (Kay ...). While much work has been done on other shrimp goby
associations, little has been done on the Hawaiian Shrimp Goby pair (review
by Karplus 1987). The most logical question that should be raised is,
"can results from the study of P. mainlandi be used
when generalizing about all Shrimp-Goby Associations?"
Thus, part of this study must asses the relative comparability of this
species to other, more well-known species. Do do this, I shall analyze
the daily activity rhythm of shrimp and goby. Previously, Karplus (1987)
has summarized the current knowledge of rhythms of shrimp gobies. The
data obtained from these studies will be compared to the results of our
study.
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