| Abstract: | A stochastic model of mallard (Anas platyrhynchos) productivity has been developed over a 10-year period and successfully applied to several management questions. Here we review the model and describe some recent uses and improvements that increase its realism and applicability, including naturally occurring changes in wetland habitat, catastrophic weather events, and the migrational homing of mallards. The amount of wetland habitat influenced productivity primarily by affecting the renesting rate. Late snowstorms severely reduced productivity, whereas the loss of nests due to flooding was largely compensated for by increased renesting, often in habitats where hatching rates were better. Migrational homing was shown to be an important phenomenon in population modeling and should be considered when evaluating management plans. |
| Genre: | Book chapter |
| ProdID: | 85380 |
| Citation Author: | Johnson, D. H.; Cowardin, L. M.; Sparling, D. W. |
| Citation Contributing Office: | Northern Prairie Wildlife Research Center |
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| Citation Editor: | Verner, J.; Morrison, L. M.; Ralph, C. J. |
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| Citation Language: | English |
| Citation Larger Work Title: | Wildlife 2000: modeling habitat relationships of terrestrial vertebrates |
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| Citation Phsyical Description: | p. 23-29 |
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| Citation Publisher: | University of Wisconsin Press |
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| Citation Search Results Text: | Evaluation of a mallard productivity model; 1986; Book chapter; Wildlife 2000: modeling habitat relationships of terrestrial vertebrates; Johnson, D. H.; Cowardin, L. M.; Sparling, D. W. |
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| Citation Year: | 1986 |
| Type: | citation/reference |
| Text: | Evaluation of a mallard productivity model; 1986; Book chapter; Wildlife 2000: modeling habitat relationships of terrestrial vertebrates; Johnson, D. H.; Cowardin, L. M.; Sparling, D. W. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DOCUMENT): | http://www.npwrc.usgs.gov/resource/birds/mpeval/index.htm |
| Date Other: | Wed, 1 Jan 1986 00:00 -0600 |
| Publisher: | University of Wisconsin Press |
