Abstract
Sampled Molothrus ater over three summers in E Ontario, to use the cowbird-haematozoa system to assess practical and theoretical aspects of testing Hamilton and Zuk's parasite hypothesis of sexual selection. Most individuals resampled within and between years were consistently scored as parasitized or unparasitized, although some individuals changed status. Many hatching-year birds were parasitized. Significant variation within and between years in general parasite prevalence, specific parasite prevalence, and intensity of infections indicated that population estimates of parasitism would be highly dependent on when birds were sampled and on the age and sex composition of the sample. Parasitism did not have a negative effect on the health of cowbirds. Parasitized birds were also recaptured at the same rate as unparasitized birds between years. Results suggest a number of pitfalls, some potentially critical,to using haematozoa infections in passerines to test the Hamilton-Zuk hypothesis. -from Authors
Original language | English (US) |
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Pages (from-to) | 1-7 |
Number of pages | 7 |
Journal | Canadian journal of zoology |
Volume | 70 |
Issue number | 1 |
DOIs | |
State | Published - 1992 |
Externally published | Yes |
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
- Animal Science and Zoology