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Article

Rusty Blackbird Habitat Selection and Survivorship during Nesting and Post-Fledging

1
New Hampshire Audubon, Concord, NH 03301, USA
2
Warnell School of Forestry, University of Georgia, Athens, GA 30602, USA
*
Author to whom correspondence should be addressed.
Diversity 2020, 12(6), 221; https://doi.org/10.3390/d12060221
Received: 13 May 2020 / Revised: 27 May 2020 / Accepted: 29 May 2020 / Published: 2 June 2020
(This article belongs to the Special Issue Boreal Bird Ecology, Management and Conservation)
Rusty blackbird (Euphagus carolinus) populations have declined dramatically since the 1970s and the cause of decline is still unclear. As is the case for many passerines, most research on rusty blackbirds occurs during the nesting period. Nest success is relatively high in most of the rusty blackbird’s range, but survival during the post-fledging period, when fledgling songbirds are particularly vulnerable, has not been studied. We assessed fledgling and adult survivorship and nest success in northern New Hampshire from May to August in 2010 to 2012. We also assessed fledgling and adult post-fledging habitat selection and nest-site selection. The likelihood of rusty blackbirds nesting in a given area increased with an increasing proportion of softwood/mixed-wood sapling stands and decreasing distances to first to sixth order streams. Wetlands were not selected for nest sites, but both adults and fledglings selected wetlands for post-fledging habitat. Fledglings and adults selected similar habitat post-fledging, but fledglings were much more likely to be found in habitat with an increasing proportion of softwood/mixed-wood sapling stands and were more likely to be closer to streams than adults. No habitat variables selected during nesting or post-fledging influenced daily survival rates, which were relatively low for adults over the 60-day study periods (males 0.996, females 0.998). Fledgling survival rates (0.89) were much higher than reported for species of similar size. View Full-Text
Keywords: Euphagus carolinus; nest success; post-fledging; rusty blackbird; survivorship; streams; wetlands Euphagus carolinus; nest success; post-fledging; rusty blackbird; survivorship; streams; wetlands
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MDPI and ACS Style

Wohner, P.J.; Foss, C.R.; Cooper, R.J. Rusty Blackbird Habitat Selection and Survivorship during Nesting and Post-Fledging. Diversity 2020, 12, 221. https://doi.org/10.3390/d12060221

AMA Style

Wohner PJ, Foss CR, Cooper RJ. Rusty Blackbird Habitat Selection and Survivorship during Nesting and Post-Fledging. Diversity. 2020; 12(6):221. https://doi.org/10.3390/d12060221

Chicago/Turabian Style

Wohner, Patricia J., Carol R. Foss, and Robert J. Cooper 2020. "Rusty Blackbird Habitat Selection and Survivorship during Nesting and Post-Fledging" Diversity 12, no. 6: 221. https://doi.org/10.3390/d12060221

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