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The Reproductive Cycle of Anolis sagrei in Southern Florida
Julian C. Lee, Deanna Clayton, Sandra Eisenstein and Ileana Perez
Vol. 1989, No. 4 (Dec. 27, 1989), pp. 930-937
Stable URL: http://www.jstor.org/stable/1445979
Page Count: 8
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We studied reproduction in Anolis sagrei for 17 consecutive months at Miami, Florida, in 1984 and 1985. Males became reproductive at about 39 mm SVL, females at about 34 mm. Reproduction was strongly seasonal. Mean testis mass was maximal from April-June, and minimal from Nov.-Jan. The percent of ovigerous females in each monthly sample was maximal from April-July and declined to zero in Nov.-Feb. Abdominal fat body mass covaried negatively with both mean testis mass of males and the proportion of ovigerous females in each monthly sample. Stomach content mass of females showed no seasonal variation; the decline in female reproduction was thus not attributable to food limitation. The single best environmental predictor of female reproduction was day length, both in terms of cueing the onset of reproduction, and in cueing its decline. Day length also was implicated as an important proximate factor cueing male reproduction, but rainfall also may have been important in cueing the decline in male reproduction in the fall. In comparison with populations at lower latitudes, reproduction in the Miami population was more strongly seasonal, and the reproductive cycle covaried most closely with day length, rather than temperature or rainfall. The interlocality variation in reproduction in A. sagrei suggests great flexibility in adjusting to local environmental conditions, and may, in part, account for the remarkable colonizing ability of this species.