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    Author(s): Alan E. Burger; Irene A. Manley; Michael P. Silvergieter; David B. Lank; Kevin M. Jordan; Thomas D. BloxtonMartin G. Raphael
    Date: 2009
    Source: Northwestern Naturalist. 90: 217-226
    Publication Series: Scientific Journal (JRNL)
    Station: Pacific Northwest Research Station
    PDF: View PDF  (1.12 MB)

    Description

    Marbled murrelets (Brachyramphus marmoratus) nest predominantly in the canopies of large old-growth conifers, and are listed as Threatened in Canada and three U.S. states mainly as a consequence of reductions in this habitat owing to logging. We assessed the re-use of nest sites (nest trees) by murrelets in British Columbia using three types of data: (1) evidence of return of adults to the same nest site, (2) evidence of multiple nests within the same tree, and (3) re-checking known nest trees in subsequent seasons for evidence of re-use. All three methods showed evidence of re-use of nest trees in different years, but there were marked regional differences in the degree of re-use. Re-use of nest trees was most frequent in regions with extensive loss of nesting habitat due to logging (southern mainland coast and east Vancouver Island), and rare in a less disturbed region (west Vancouver Island). Overall, 26 of 143 (18 percent) nest trees climbed showed evidence of multiple nesting in separate seasons. Management of nesting habitat should incorporate these results by providing greater protection of habitat in regions where habitat is sparse, and by minimizing predation risk where murrelets more frequently re-use nest sites. Because re-use of nest sites is infrequent, managers should aim to provide murrelets with multiple choices for nest sites, such as maintaining large tracts of old-growth forest with many large trees containing potential nest platforms.

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    Citation

    Burger, A.E.; Manley, I.A.; Silvergieter, M.P.; Lank, D.B.; Jordan, K.M.; Bloxton, T.D.; Raphael, M.G. 2009. Re-use of nest sites by marbled murrelets (Brachyramphus marmoratus) in British Columbia. Northwestern Naturalist. 90: 217-226.

    Keywords

    Marbled murrelet, Brachyramphus marmoratus, nest re-use, British Columbia, conservation, habitat selection

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