Breeding and post-breeding responses of woodland birds to modification of habitat structure by deer

Holt, Chas A., Fuller, Robert J. and Dolman, Paul M. (2011) Breeding and post-breeding responses of woodland birds to modification of habitat structure by deer. Biological Conservation, 144 (9). pp. 2151-2162.

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Abstract

Birds in woodland can be affected by increasing deer populations through changes to vegetation structure and potential impacts on foraging resources; these effects need to be better understood. Effects of deer browsing are reported from a replicated split-plot exclusion experiment in English coppiced woodland. All stages of growth were examined up to eight years after felling. We used standardised mist-netting (totaling 1920 h) to sample birds in breeding and post-breeding periods. Deer browsing strongly altered vegetation structure by reducing canopy cover and shrub layer foliage density. However deer did not affect invertebrate density per unit of foliage, providing no evidence of an ungulate-mediated plant chemical response affecting forage quality for invertebrate herbivores. At avian guild level, significantly more ground and understorey foraging birds were captured where deer were excluded, and negative responses to browsing were more marked for pooled migrants than pooled residents. At the species level, especially pronounced negative effects were evident for dunnock (Prunella modularis) and garden warbler (Sylvia borin); approximately five times more dunnocks were captured in deer exclosures than in browsed vegetation. We also detected negative responses to browsing by nightingale (Luscinia megarhynchos) and long-tailed tit (Aegithalos caudatus). No significant positive responses to browsing were detected. For some species the use of young re-growth increased post breeding relative to the breeding period, including a marked shift by pooled residents that involved a disproportionate number of juveniles. Previous studies in North America have shown that, through vegetation modification, ungulate activity can alter woodland bird assemblages; as far as we are aware this is the first experimental demonstration of effects in Europe, and at low to moderate browsing intensity typical of the wider landscape scale.

Item Type: Article
Uncontrolled Keywords: deer ,invertebrate,habitat structure,woodland bird,regenerating vegetation,exclosure study ,deer impacts,ecology, evolution, behavior and systematics,ecology,nature and landscape conservation ,/dk/atira/pure/subjectarea/asjc/1100/1105
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: Rosie Cullington
Date Deposited: 28 Jun 2011 09:15
Last Modified: 21 Apr 2020 16:47
URI: https://ueaeprints.uea.ac.uk/id/eprint/33071
DOI: 10.1016/j.biocon.2011.05.004

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