Breeding Ecology and Behavior of the Hawaiian Hawk
| Autor: | Thomas S. Baskett, Curtice R. Griffin, Peter W. C. Paton |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Avian clutch size
education.field_of_study Ecology Fledge Population Endangered species Zoology Biology biology.organism_classification medicine.disease Buteo solitarius Avian malaria Threatened species medicine Biological dispersal Animal Science and Zoology education Ecology Evolution Behavior and Systematics |
| Zdroj: | The Condor. 100:654-662 |
| ISSN: | 1938-5129 0010-5422 |
| DOI: | 10.2307/1369746 |
| Popis: | We studied the ecology of the endangered Hawaiian Hawk (Buteo solitarius) on the island of Hawaii for three breeding seasons. Their breeding strategy is a prime example of a K-selected species characteristic of many birds in tropical environments: clutch size was one and brood-rearing was among the longest reported for any diurnal raptor. Twenty-eight nests were found in a variety of native and exotic habitats. Incubation lasted 38 days, nestlings fledged after 59-63 days, and parents cared for fledglings for an average of 30.2 weeks, which was 2.5 to 10 times longer than similar-size temperate zone raptors. Males assisted females with incubation, but only females brooded young. Radio-tagged juveniles remained within 0.63 km of their nests for the first two months after fledging, after which dispersal distances expanded gradually. Avian (45%) and mammalian (54%) prey dominated the diet of nestlings. There was no evidence that avian malaria, introduced predators, or environmental contaminants were affecting their population. Based upon estimates of population size, the availability of suitable nesting habitat, and reproductive success, we suggest the species be considered for downlisting from endangered to threatened status. |
| Databáze: | OpenAIRE |
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