Poulin20081129

Référence

Poulin, J.-F., Villard, M.-A., Edman, M., Goulet, P.J., Eriksson, A.-M. (2008) Thresholds in nesting habitat requirements of an old forest specialist, the Brown Creeper (Certhia americana), as conservation targets. Biological Conservation, 141(4):1129-1137. (Scopus )

Résumé

Many bird species respond to forestry, even at moderate intensities. In New Brunswick, Canada, the Brown Creeper exhibits a negative, threshold response to harvesting intensity. This study aimed to determine whether (a) the threshold found in Brown Creeper occurrence is lower than eventual thresholds in its nesting requirements, and whether (b) the conservation of this species could be achieved through moderate-intensity harvest systems. Creepers are particularly sensitive to forestry because they nest on snags with peeling bark and they mainly forage on large-diameter trees. In northern hardwood stands, we compared habitat structure at local- (r = 80 m) and neighbourhood-scales (r = 250 m) around nest sites and sites not used by creepers. Over two years, we found 76 nests, 66 of which were paired with unused sites for comparison. At the local scale, densities of trees ≥30 cm dbh and snags ≥10 cm dbh, and the probability of presence of potential nest sites were significantly higher near nests than at sites where no creepers were detected. At the neighbourhood scale, the area of untreated mature forest was significantly higher around nests. Variance decomposition indicated that habitat variables at the local scale accounted for the majority of explained variation in nest site selection. We also found significant thresholds in the densities of large trees (127/ha) and snags (56/ha), and in the area of mature forest (10.4 ha). The conservation of breeding populations of Brown Creepers may thus require densities of large trees nearly twice as high as those associated with its probability of presence. Such a target seems to be incompatible even with moderate-intensity harvesting. © 2008 Elsevier Ltd. All rights reserved.

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@ARTICLE { Poulin20081129,
    AUTHOR = { Poulin, J.-F. and Villard, M.-A. and Edman, M. and Goulet, P.J. and Eriksson, A.-M. },
    TITLE = { Thresholds in nesting habitat requirements of an old forest specialist, the Brown Creeper (Certhia americana), as conservation targets },
    JOURNAL = { Biological Conservation },
    YEAR = { 2008 },
    VOLUME = { 141 },
    NUMBER = { 4 },
    PAGES = { 1129-1137 },
    NOTE = { cited By 35 },
    ABSTRACT = { Many bird species respond to forestry, even at moderate intensities. In New Brunswick, Canada, the Brown Creeper exhibits a negative, threshold response to harvesting intensity. This study aimed to determine whether (a) the threshold found in Brown Creeper occurrence is lower than eventual thresholds in its nesting requirements, and whether (b) the conservation of this species could be achieved through moderate-intensity harvest systems. Creepers are particularly sensitive to forestry because they nest on snags with peeling bark and they mainly forage on large-diameter trees. In northern hardwood stands, we compared habitat structure at local- (r = 80 m) and neighbourhood-scales (r = 250 m) around nest sites and sites not used by creepers. Over two years, we found 76 nests, 66 of which were paired with unused sites for comparison. At the local scale, densities of trees ≥30 cm dbh and snags ≥10 cm dbh, and the probability of presence of potential nest sites were significantly higher near nests than at sites where no creepers were detected. At the neighbourhood scale, the area of untreated mature forest was significantly higher around nests. Variance decomposition indicated that habitat variables at the local scale accounted for the majority of explained variation in nest site selection. We also found significant thresholds in the densities of large trees (127/ha) and snags (56/ha), and in the area of mature forest (10.4 ha). The conservation of breeding populations of Brown Creepers may thus require densities of large trees nearly twice as high as those associated with its probability of presence. Such a target seems to be incompatible even with moderate-intensity harvesting. © 2008 Elsevier Ltd. All rights reserved. },
    AFFILIATION = { Chaire de recherche du Canada en conservation des paysages, Département de biologie, Université de Moncton, Moncton, NB, E1A 3E9, Canada; Department of Natural Science, Mid Sweden University, 851 70 Sundsvall, Sweden },
    AUTHOR_KEYWORDS = { Certhia americana; Conservation targets; Ecological thresholds; Northern hardwood forest; ROC analysis; Selection harvesting },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1016/j.biocon.2008.02.012 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-41949099757&doi=10.1016%2fj.biocon.2008.02.012&partnerID=40&md5=66c98710255b7c4d5cc08ddd08d68fe2 },
}

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