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Gregory Corace III R.,U.S. Fish and Wildlife Service | Charles Goebel P.,Ohio State University | Mccormick D.L.,Common Coast Research and Conservation
Natural Areas Journal | Year: 2010

Intensive management of jack pine (Pinus banksiana Lamb.) plantations has led to a population increase and breeding range expansion of the endangered Kirtland's Warbler (Dedroica kirtlandii Baird). However, no study has quantified the different bird communities that are associated with Kirtland's Warbler habitat management. We examined bird species conservation scenarios of warbler habitat management by addressing the following: (1) how do bird community structure and conservation scenarios differ among jack pine habitats of three discrete age classes (YOUNG, < 5 years; KW, 523 years; and OLD, > 23 years)?; (2) what functional groups (e.g., nest placement groups, foraging groups) of bird species are represented among these three habitat types?; and (3) what are the relationships between bird communities and the composition and structure of these habitat types? Sixty bird species were observed in 37 habitat patches across the three habitat types. Conservation metrics based upon the pooled species lists for each of the habitat types indicated no difference (P > 0.05) among them. Five bird species of U.S. Fish and Wildlife Service Regional Conservation Priority were found among the habitat types, with all but Kirtland's Warbler most common in the YOUNG habitat. Five indicator species associated with the YOUNG and KW habitat types were observed, while nine species were associated with the OLD habitat. A functional group analysis indicated that stand structure was important for breeding species across habitat types. We believe our results support increased ecologically-based planning and management across jack pine habitats for more than just Kirtland's Warbler.

Debiak A.L.,Northern Michigan University | McCormick D.L.,Common Coast Research and Conservation | Kaplan J.D.,Common Coast Research and Conservation | Tischler K.B.,Common Coast Research and Conservation | Lindsay A.R.,Northern Michigan University
Waterbirds | Year: 2014

We used a polymerase chain reaction (PCR)-based sex identification technique to evaluate the sex ratios of pre-fledged juvenile Common Loons (Gavia immer) from three breeding populations in northern Michigan and northern Wisconsin, and of dead adult Common Loons migrating through Lake Huron. Results of these analyses show that more juvenile males than females fledged from all three breeding populations, although none of these biases differed significantly from parity. The sex ratio of migratory adults was at parity. No parental or territory quality indicators were significantly associated with the sex of chicks fledged from one intensely studied northern Michigan population at Seney National Wildlife Refuge. A significant male bias in adult re-observation of Common Loons banded as juveniles at the wildlife refuge was not solely attributable to the modest male bias recorded at fledging, and thus suggests a pattern of female-biased post-fledging mortality and/or female-biased adult dispersal in Common Loons.

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