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Reproduction in an Introduced Population of the Brown Anole, Anolis sagrei, from O'ahu, Hawai'i

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Title:Reproduction in an Introduced Population of the Brown Anole, Anolis sagrei, from O'ahu, Hawai'i
Authors:Goldberg, Stephen R.
Kraus, Fred
Bursey, Charles R.
Date Issued:Apr 2002
Publisher:University of Hawai'i Press
Citation:Goldberg SR, Kraus F, Bursey CR. 2002. Reproduction in an introduced population of the brown anole, Anolis sagrei, from O'ahu, Hawai'i. Pac Sci 56(2): 163-168.
Abstract:The reproductive cycle of an introduced population of the brown
anole, Analis sagrei, from O'ahu, Hawai'i, was studied from a histological examination
of monthly samples collected July 1999 to June 2000. Males undergo
a seasonal testicular cycle in which all males> 38 mm snout-vent length are
in spermiogenesis from January to August. Although some ovarian activity
was found in all months, the period of greatest ovarian inactivity was October-December,
which corresponds to the time of male gonadal regression. The reproductive
cycle of A. sagrei in Hawai'i resembles that of populations in Belize,
Florida, and Jamaica, where minimum gonadal activity was recorded from November
through February. Body sizes at reproductive maturity were similar in
all four localities. Analis sagrei in Hawai'i has an ovarian cycle typical of other
Analis lizards with a prolonged breeding season and production of single eggs in
succession. Because A. sagrei has been in Hawai'i for only approximately 20 yr,
sufficient time has not elapsed to allow evolution of its reproductive cycles, but
this study presents baseline reproductive data that can be used for future studies
to see if the A. sagrei reproductive cycles are modified as the lizards adapt to the
environmental conditions of their newly colonized range.
Appears in Collections: Pacific Science Volume 56, Number 2, 2002

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