| Abstract: | Knowledge of the timing, magnitude, and cause of mortality in wildlife populations is imperative for developing management strategies that protect or improve the status of these populations. Age- and sex-specific population parameter estimates provide the most useful information for this purpose. Numerous studies have provided information about survival rates in mallards (Anas platyrhynchos), but little is known about age-related differences in female survival during the breeding period. We examined band-recovery data for female mallards banded in southern portions of Alberta, Saskatchewan, and Manitoba during spring and summer 1981-85. We used band-recovery models to test the hypothesis that yearling females would exhibit higher survival compared with that of older females during spring-summer. There was evidence (P = 0.08) that spring-summer survival rates of yearling females (0.728) were higher than that of older females (0.574). These findings support the hypothesis that age-specific differences in nesting behavior (e.g., later nest initiation and fewer nesting attempts by yearlings) influence losses to predators and are responsible for the difference in spring-summer survival. Management treatments that increase nest success, and consequently reduce the need for prolonged nesting, will increase mallard survival during spring-summer. |
| Genre: | Article |
| ProdID: | 5223061 |
| Citation Author: | Reynolds, R.E.; Blohm, R.J.; Nichols, J.D.; Hines, J.E. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation End Page: | 696 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Wildlife Management |
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| Citation Number Of Pages: | 6 |
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| Citation Phsyical Description: | 691-696 |
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| Citation Public Comments: | 4833_Reynolds.pdf |
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| Citation Search Results Text: | Spring-summer survival rates of yearling versus adult mallard females; 1995; Article; Journal; Journal of Wildlife Management; Reynolds, R.E.; Blohm, R.J.; Nichols, J.D.; Hines, J.E. |
| Citation Start Page: | 691 |
| Citation Volume: | 59 |
| Citation Year: | 1995 |
| Type: | citation/reference |
| Text: | Spring-summer survival rates of yearling versus adult mallard females; 1995; Article; Journal; Journal of Wildlife Management; Reynolds, R.E.; Blohm, R.J.; Nichols, J.D.; Hines, J.E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DOCUMENT): | http://www.jstor.org/stable/3801945 |
| Date Other: | Wed, 16 Jun 2010 12:17 -0500 |
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