Distribution and abundance of raptors in Puerto Rico.: An article from: Wilson Bulletin
Book Details
Author(s)Frank F. Rivera-Milan
PublisherWilson Ornithological Society
ISBN / ASINB00093UBM0
ISBN-13978B00093UBM2
AvailabilityAvailable for download now
Sales Rank14,314,342
MarketplaceUnited States 🇺🇸
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This digital document is an article from Wilson Bulletin, published by Wilson Ornithological Society on September 1, 1995. The length of the article is 2839 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: From July 1986 to June 1988, I counted all raptors (Falconiformes and Strigiformes) seen or heard along 15 8-km routes in the three major life zones of Puerto Rico (moist, wet, and dry). Red-tailed Hawks (Buteo jamaicensis) and American Kestrels (Falco sparverius) were the most abundant year-round residents. Red-tailed Hawks were more abundant in the moist zone than in the wet zone. American Kestrels did not differ significantly in the dry and moist zones. Red-tailed Hawks were more abundant than American Kestrels in the moist zone. The most abundant winter residents were Merlins (F. columbarius), Peregrine Falcons (F. peregrinus,) and Ospreys (Pandion haliaetus); all three species were frequently detected in the dry zone but were less abundant than American Kestrels. The abundances of Merlins, Peregrine Falcons, and Ospreys did not differ significantly. The abundances of raptors (pooled) peaked in autumn (September-November) and winter (December-February). Roadside counts were highly variable (coefficients of variation ranged from 85-243%). As a result, the within-year sample-sizes (8-km routes) needed to provide confidence limits of [+ or -] 10-50% ([t.sub.0.05] [similar to] 2.0) on mean abundance estimates ([Mathematical Expression Omitted] of the most abundant species in the life zones were high.
Citation Details
Title: Distribution and abundance of raptors in Puerto Rico.
Author: Frank F. Rivera-Milan
Publication:Wilson Bulletin (Refereed)
Date: September 1, 1995
Publisher: Wilson Ornithological Society
Volume: v107 Issue: n3 Page: p452(11)
Distributed by Thomson Gale
From the author: From July 1986 to June 1988, I counted all raptors (Falconiformes and Strigiformes) seen or heard along 15 8-km routes in the three major life zones of Puerto Rico (moist, wet, and dry). Red-tailed Hawks (Buteo jamaicensis) and American Kestrels (Falco sparverius) were the most abundant year-round residents. Red-tailed Hawks were more abundant in the moist zone than in the wet zone. American Kestrels did not differ significantly in the dry and moist zones. Red-tailed Hawks were more abundant than American Kestrels in the moist zone. The most abundant winter residents were Merlins (F. columbarius), Peregrine Falcons (F. peregrinus,) and Ospreys (Pandion haliaetus); all three species were frequently detected in the dry zone but were less abundant than American Kestrels. The abundances of Merlins, Peregrine Falcons, and Ospreys did not differ significantly. The abundances of raptors (pooled) peaked in autumn (September-November) and winter (December-February). Roadside counts were highly variable (coefficients of variation ranged from 85-243%). As a result, the within-year sample-sizes (8-km routes) needed to provide confidence limits of [+ or -] 10-50% ([t.sub.0.05] [similar to] 2.0) on mean abundance estimates ([Mathematical Expression Omitted] of the most abundant species in the life zones were high.
Citation Details
Title: Distribution and abundance of raptors in Puerto Rico.
Author: Frank F. Rivera-Milan
Publication:Wilson Bulletin (Refereed)
Date: September 1, 1995
Publisher: Wilson Ornithological Society
Volume: v107 Issue: n3 Page: p452(11)
Distributed by Thomson Gale
