| Abstract: | The breeding biology of the Snail Kite was studied in Florida from 1968-1977 and intermittently from 1978-1980. Breeding occurred every month, but not in the same year. Peak egg-laying occurred from February through April or generally about 8 1 d before the onset of the rainy season in mid- or late May. Courtship displays, copulation and duration of copulation are described. Mean egg-laying interval was 2.2 d, and clutch size ranged from 1-6 eggs (x = 2.92). The frequency of large clutches (4-6 eggs) was significantly greater before 1940 than after. Incubation, which was shared by both sexes, lasted 24-30 d (x = 27.4). Egg length and breadth, eggshell thickness and weight, and whole egg volume and weight are presented. Hatching success was 57.5%. Mean hatching success for all clutches was 1.7 young or 2.3 per successful clutch. Hatching success of 2- and 3-egg clutches did not differ significantly. The nestlin period averaged 28.7 d (range 23-34). The interval between fledging of the first and last nestling in 1 brood was up to 5 d. An average of 2.0 young were raised per successful nest, and 50.5% of the nests were successful. The mean percent of successful nests per year for the 11-yr period (excluding the drought year 1971 in which there was no nesting) was 56.5 (range 17.1-84.6/yr). Nestling mortality was 37% overall, but was less during favorable high water conditions. Twenty-two factors are identified as causing nesting failure in kites, principal among these was predation (44%). |
| Genre: | Article |
| ProdID: | 5222173 |
| Citation Author: | Sykes, P.W., Jr. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation End Page: | 189 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Field Ornithology |
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| Citation Number Of Pages: | 19 |
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| Citation Phsyical Description: | 171-189 |
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| Citation Search Results Text: | Some aspects of the breeding biology of the snail kite in Florida; 1987; Article; Journal; Journal of Field Ornithology; Sykes, P.W., Jr. |
| Citation Start Page: | 171 |
| Citation Volume: | 58 |
| Citation Year: | 1987 |
| Type: | citation/reference |
| Text: | Some aspects of the breeding biology of the snail kite in Florida; 1987; Article; Journal; Journal of Field Ornithology; Sykes, P.W., Jr. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DOCUMENT): | http://elibrary.unm.edu/sora/JFO/v058n02/p0171-p0189.pdf |
| Date Other: | Wed, 16 Jun 2010 12:19 -0500 |
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