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Distance to edges, edge contrast and landscape fragmentation: Interactions affecting farmland birds around forest plantations

Reino, Luis, Beja, Pedro, Osborne, P.E., Morgado, Rui, Fabião, António and Rotenberry, John (2009) Distance to edges, edge contrast and landscape fragmentation: Interactions affecting farmland birds around forest plantations Biological Conservation, 142, (4), pp. 824-838. (doi:10.1016/j.biocon.2008.12.011).

Record type: Article

Abstract

Afforestation often causes direct habitat losses for farmland birds of conservation concern, but it is uncertain whether negative effects also extend significantly into adjacent open land. Information is thus required on how these species react to wooded edges, and how their responses are affected by edge and landscape characteristics.
These issues were examined in Mediterranean arable farmland, using bird counts at 0, 100, 200, 300 and >300 m from oak, pine and eucalyptus edges, embedded in landscapes with variable amounts and spatial configurations of forest plantations. Bird diversity declined away from edges, including that of woodland, farmland and ground-nesting birds. Positive edge responses were also found for overall and woodland bird abundances, and for five of the nine most widespread and abundant species (Galerida larks, stonechat, linnet, goldfinch and corn bunting). Strong negative edge effects were only recorded for steppe birds, with reduced abundances near edges of calandra larks and short-toed larks, but not of little bustards and tawny pipits.
Edge contrast affected the magnitude of edge effects, with a tendency for stronger responses to old and tall eucalyptus plantations (hard edges) than to young and short oak plantations (soft edges). There were also species-specific interactions between edge and fragmentation effects, with positive edge responses tending to be strongest in less fragmented landscapes, whereas steppe birds tended to increase faster away from edges and to reach the highest species richness and abundances in large arable patches.
Results suggest that forest plantations may increase overall bird diversity and abundance in adjacent farmland, at the expenses of steppe birds of conservation concern. Clustering forest plantations in a few large patches and thus reducing the density of wooded edges at the landscape-scale might reduce such negative impacts.

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More information

Published date: 2009
Keywords: afforestation, edge effects, landscape management, grassland, mediterranean farmland, steppe birds
Organisations: Civil Engineering & the Environment

Identifiers

Local EPrints ID: 74630
URI: http://eprints.soton.ac.uk/id/eprint/74630
ISSN: 0006-3207
PURE UUID: 93b2fdf9-6fac-4586-96da-0f60d3a770b5

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 18 Jul 2017 23:45

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Contributors

Author: Luis Reino
Author: Pedro Beja
Author: P.E. Osborne
Author: Rui Morgado
Author: António Fabião
Author: John Rotenberry

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