Abstract
Abstract Rostrhamus sociabilis (Snail Kite) nesting success and productivity were studied at the recently colonized Lake Kissimmee and historically occupied Lake Okeechobee in Florida during 1987 to 1993. Mean (± SD) clutch size for all lake-years was 2.79 ± 0.49, with 3-egg clutches (75.2%) being most frequent. No significant difference was detected in the overall distribution of 2-, 3-, and 4-egg clutches between lakes. The mean number of fledglings for all lake-years was 0.79 ± 0.99 fledgling/nest. Only 44.1% of all nests were successful in fledging birds. Fledging success did not differ significantly among years at Lake Kissimmee. However, significant differences occurred among years at Lake Okeechobee due to the high frequency of failed nests in 1990 (72.2%) and 1991 (74.3%) during low lake levels. Productivity at Lake Kissimmee (0.88 ± 1.00 fledgling/nest) was significantly greater than at Lake Okeechobee (0.74 ± 0.98 fledgling/nest). Estimated nest survivorship (Sday: nest age in days) combined for...
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