Biology 3442F/G Lecture Notes - Lecture 10: Cowbird, Clearcutting, Habitat Fragmentation
18 Sep 2019
School
Department
Course
Professor
Document Summary
Importance of experimental manipulation: the case of the brown-headed cowbird and the kirtland warbler: kirtland warbler - endangered, brown-headed cowbird - least concern. Obligate brood parasites: brown headed cowbird - is the parasite in the warbler nest. Domesticated cow replace bison (talking about birds: now an invasive species, with habitat fragmentation, cowbirds can access forest-dwelling species that did not coincide with the cowbird, high parasitism rates. Impacts on host reproductive success vary depending on shared evolutionary history with cowbirds. Some may be able to raise some of their own young while others might completely lose any reproductive success. Loggers prefer 50 yo trees for sufficient profit: conflict of interests between what we need and what the kirtland warbler wants. Jack pine range: nests under extensive tracts of *young* jack pine, the age of jack pine is retained through forest fires - but forest fires have been suppressed.
