Please use this identifier to cite or link to this item: http://hdl.handle.net/10125/66569

Population status, habitat dependence, and reproductive ecology of Bahama Orioles: a critically endangered synanthropic species.

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Title:Population status, habitat dependence, and reproductive ecology of Bahama Orioles: a critically endangered synanthropic species.
Authors:Price, Melissa R.
Lee, Valerie A.
Hayes, William K.
Keywords:breeding behavior
brood parasitism
lethal yellowing
nest site selection
Shiny Cowbird
show 9 moredouble clutch
nest construction
nesting success
population estimate
breeding phenology
clutch size
chick nestling diet
helper at the nest
double brood
show less
Date Issued:2011
Citation:Price, M. R., V. A. Lee, and W. K. Hayes (2011) Population status, habitat dependence, and reproductive ecology of Bahama Orioles: a critically endangered synanthropic species. Journal of Field Ornithology 82(4):366–378.
Abstract:Recent elevation of critically endangered Bahama Orioles (Icterus northropi) to species status promptedustoevaluate theirpopulation status,habitatuse,andbreedingecology.Fromsurveys,weestimatedthat at least 141 to 254 individuals remain globally, with 90 to 162, 24 to 44, and 27 to 48 individuals remaining on North Andros Island, Mangrove Cay, and South Andros Island, The Bahamas, respectively. Orioles were observed nesting exclusively in anthropogenic habitat (residential and agricultural land), but home ranges also included nearby pine forest and coppice (dry broadleaf forest). Most nests (40 of 46, or 87%) were in nonnative coconut palm (Cocos nucifera), with native Sabal palmetto and Thrinax morrisii, and an introduced Brassaia actinophylla also used. Trees selected by orioles for nesting were significantly taller, less likely to have shrubs underneath, further from cover, and had more palm trees nearby than randomly selected palm trees. Three of eight nests with known contents were parasitized by Shiny Cowbirds (Molothrus bonariensis). Lethal yellowing disease recently devastated coconutpalmsandreducedthenumberoforiolesonNorthAndros,butpalmsonMangroveCayandSouthAndros remain healthy. The juxtaposition of anthropogenic habitat to suitable native habitats may be more important than any single factor for Bahama Orioles, especially for breeding adults and fledged young. Conservation of coppice habitat, at high risk for agricultural and residential development, is crucial for survival of this critically endangered synanthropic species.
Pages/Duration:13
URI:http://hdl.handle.net/10125/66569
Volume:82
Issue/Number:4
Appears in Collections: Hawaii Wildlife Ecology Lab


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