Lecture 11.pptx - BIOL 3442F – 2019 Instructor Dr Junyan Zhang A Case Study Kirtland’s warbler – an endangered species Cause factors 2

Lecture 11.pptx - BIOL 3442F – 2019 Instructor Dr Junyan...

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Instructor: Dr. Junyan Zhang BIOL 3442F – 2019
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2 A Case Study Kirtland’s warbler – an endangered species Cause factors
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Kirtland’s warbler ( Setophaga kirtlandii ) Endangered 2000 Brown-headed cowbird ( Molothrus ater ) Least concern
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Reed warbler feeding juvenile common cuckoo Cuckoo egg Warbler egg Per Harald Olsen/Wikimedia Commons
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nestwatch.or g This cowbird egg (top, left) was laid in an Eastern Bluebird's nest, inside a nest box. Nestwatch.org Yellow Warblers feeding their four young chicks plus a
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Followed herds of North American Bison (constantly on the move) and fed on insects stirred up by their movement. Dependent on this food source, they developed the ability to lay eggs in other nests and continue moving with the herds. Rang limited to short-grass plains (and host species found there) Clear-cutting of forest habitat allowed expansion of both populations. “from the most delightful bird of the prairies to modern scourge” Nick Davies: Cuckoos, Cowbirds, and Other Cheats
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