| Abstract: | A standard method for characterizing nest sites and concealment (visibility of orange decoy and percent overhead cover measured by densiometer) was used to obtain characteristics of 36 nest sites of black ducks in Maine, 1978-89. Nest locations were represented by cutover areas (10), islands (6), bogmat (5), emergent meadow (5), emergent wetland (3), stream floodplain (3), hardwood forest (1), conifer forest (1), mixed forest (1) and ephemeral pond (1). Within these locations nests were found in shrub clumps (1), under conifers (6), on hummocks (6), on ericaceous mats (4), under a clump of hardwood trees (4), under woody slash (3), on an emergent herbaceous clump (1), on a boulder (1) and on a muskrat house (1). After excluding 7 nests disturbed by investigators, 22 (76%) of the 29 remaining nests were successful nests. Nests in upland cuts were especially successful (9 of 9) and success was 75 - 100% at most locations, but both nests along stream floodplain were abandoned because of human disturbance. Unsuccessful nests were usually closer to ponds (2.5 times) or streams (6.6 times) and often at land water interfaces, i.e., islands and bogmat. Nests under conifers (5 of 6) and woody slash (3 of 3) usually were successful. The combination of low nesting density and isolation of nests in upland cutover areas (successful nests averaged nearly 3 times farther from roads) seem to influence black duck nest success. |
| Genre: | Book chapter |
| ProdID: | 5210973 |
| Citation Author: | Longcore, J.R.; McAuley, D.G.; Ringelman, J.K. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation Language: | English |
| Citation Larger Work Title: | American Black Duck Symposium: Saint John, New Brunswick, Canada, 1990 |
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| Citation Number Of Pages: | 57 |
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| Citation Phsyical Description: | 57 |
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| Citation Public Comments: | Co-published by the Black Duck Joint Venture, North American Waterfowl Management Plan. OCLC: 42352724. Abstract no. 17 in publication. |
| Citation Publisher: | Black Duck Joint Venture |
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| Citation Search Results Text: | Characteristics of some black duck nest sites in Maine; 1997; Book chapter; American Black Duck Symposium: Saint John, New Brunswick, Canada, 1990; Longcore, J.R.; McAuley, D.G.; Ringelman, J.K. |
| Citation Start Page: | 30 (abs) |
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| Citation Year: | 1997 |
| Type: | citation/reference |
| Text: | Characteristics of some black duck nest sites in Maine; 1997; Book chapter; American Black Duck Symposium: Saint John, New Brunswick, Canada, 1990; Longcore, J.R.; McAuley, D.G.; Ringelman, J.K. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 9 Jun 2009 09:23 -0500 |
| Publisher: | Black Duck Joint Venture |
