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Population declines in North American birds that migrate to the neotropics.

Abstract：

:Using data from the North American Breeding Bird Survey, we determined that most neotropical migrant bird species that breed in forests of the eastern United States and Canada have recently (1978-1987) declined in abundance after a period of stable or increasing populations. Most permanent residents and temperate-zone migrants did not show a general pattern of decrease during this period. Field data from Mexico were used to classify a subset of the neotropical migrants as using forest or scrub habitats during winter. Population declines during 1978-1987 were significantly greater among the forest-wintering species, while populations of scrub-wintering species increased. The same subset of neotropical migrants also showed overall declines in forest-breeding species, but no significant differences existed between species breeding in forest and scrub habitats. Neotropical migrant species that primarily use forested habitats in either wintering or breeding areas are declining, but a statistically significant association between habitat and population declines was detected only in the tropics.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Robbins CS,Sauer JR,Greenberg RS,Droege S

doi

10.1073/pnas.86.19.7658

subject

Has Abstract

pub_date

1989-10-01 00:00:00

pages

7658-62

issue

19

eissn

0027-8424

issn

1091-6490

journal_volume

86

pub_type

杂志文章

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