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Inter-annual variability in the home range of breeding turtles: Implications for current and future conservation management

Gail Schofield, Victoria Hobson, Martin K.S Lilley, Kostas A Katselidis, Charles M Bishop, Peter Brown, Graeme Hays

Biological Conservation, Volume: 143, Issue: 3, Pages: 722 - 730

Swansea University Authors: Victoria Hobson, Graeme Hays

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DOI (Published version): 10.1016/j.biocon.2009.12.011

Abstract

We assessed home range size for breeding loggerhead turtles (Caretta caretta) near the limit of the species range at the Greek island of Zakynthos in the Mediterranean. Thirteen adult females and seven adult males were tracked using GPS units (loggers and transmitters) during May and June of 2006, 2...

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Published in: Biological Conservation
ISSN: 0006-3207
Published: 2010
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URI: https://cronfa.swan.ac.uk/Record/cronfa6126
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spelling 2011-10-01T00:00:00.0000000 v2 6126 2011-10-01 Inter-annual variability in the home range of breeding turtles: Implications for current and future conservation management 9024f9f0a80d2d248c7c6efb2e715c37 Victoria Hobson Victoria Hobson true false e40f098395f86f19debb12442dd95ac3 Graeme Hays Graeme Hays true false 2011-10-01 SBI We assessed home range size for breeding loggerhead turtles (Caretta caretta) near the limit of the species range at the Greek island of Zakynthos in the Mediterranean. Thirteen adult females and seven adult males were tracked using GPS units (loggers and transmitters) during May and June of 2006, 2007 and 2008. Kernel analysis indicated that core home range sizes (50% estimator; range: 2.9-19.7 km(2)) for both males and females were restricted to a 7.5 km tract of coastline. 15% of GPS locations fell outside of the national park protection zones, while within the protected breeding area 88% of GPS locations occurred in zones of minimal protection. Female home ranges were 64% larger in 2008 than in 2006 and 2007, indicating that several years monitoring may be required for the most effective designation of marine protected areas (MPAs). Ten of the tracked females departed the core breeding area on 15 occasions for periods of 1-15 days travelling distances of 10-100 km, although none nested at alternative breeding sites. The inter-annual variability of breeding area home range size and likelihood of incidence of forays appeared be correlated with barometric pressure. The movement responses of loggerheads to environmental conditions implicates an ability to switch nesting areas over small scales in response to climate change. However, such behaviour suggests the protection of existing core breeding sites may be inadequate, with policy makers being required to consider the protection of broader areas to encompass potential changes in the habitat needs of this species. Journal Article Biological Conservation 143 3 722 730 0006-3207 31 12 2010 2010-12-31 10.1016/j.biocon.2009.12.011 COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University 2011-10-01T00:00:00.0000000 2011-10-01T00:00:00.0000000 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Gail Schofield 1 Victoria Hobson 2 Martin K.S Lilley 3 Kostas A Katselidis 4 Charles M Bishop 5 Peter Brown 6 Graeme Hays 7
title Inter-annual variability in the home range of breeding turtles: Implications for current and future conservation management
spellingShingle Inter-annual variability in the home range of breeding turtles: Implications for current and future conservation management
Victoria Hobson
Graeme Hays
title_short Inter-annual variability in the home range of breeding turtles: Implications for current and future conservation management
title_full Inter-annual variability in the home range of breeding turtles: Implications for current and future conservation management
title_fullStr Inter-annual variability in the home range of breeding turtles: Implications for current and future conservation management
title_full_unstemmed Inter-annual variability in the home range of breeding turtles: Implications for current and future conservation management
title_sort Inter-annual variability in the home range of breeding turtles: Implications for current and future conservation management
author_id_str_mv 9024f9f0a80d2d248c7c6efb2e715c37
e40f098395f86f19debb12442dd95ac3
author_id_fullname_str_mv 9024f9f0a80d2d248c7c6efb2e715c37_***_Victoria Hobson
e40f098395f86f19debb12442dd95ac3_***_Graeme Hays
author Victoria Hobson
Graeme Hays
author2 Gail Schofield
Victoria Hobson
Martin K.S Lilley
Kostas A Katselidis
Charles M Bishop
Peter Brown
Graeme Hays
format Journal article
container_title Biological Conservation
container_volume 143
container_issue 3
container_start_page 722
publishDate 2010
institution Swansea University
issn 0006-3207
doi_str_mv 10.1016/j.biocon.2009.12.011
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 0
active_str 0
description We assessed home range size for breeding loggerhead turtles (Caretta caretta) near the limit of the species range at the Greek island of Zakynthos in the Mediterranean. Thirteen adult females and seven adult males were tracked using GPS units (loggers and transmitters) during May and June of 2006, 2007 and 2008. Kernel analysis indicated that core home range sizes (50% estimator; range: 2.9-19.7 km(2)) for both males and females were restricted to a 7.5 km tract of coastline. 15% of GPS locations fell outside of the national park protection zones, while within the protected breeding area 88% of GPS locations occurred in zones of minimal protection. Female home ranges were 64% larger in 2008 than in 2006 and 2007, indicating that several years monitoring may be required for the most effective designation of marine protected areas (MPAs). Ten of the tracked females departed the core breeding area on 15 occasions for periods of 1-15 days travelling distances of 10-100 km, although none nested at alternative breeding sites. The inter-annual variability of breeding area home range size and likelihood of incidence of forays appeared be correlated with barometric pressure. The movement responses of loggerheads to environmental conditions implicates an ability to switch nesting areas over small scales in response to climate change. However, such behaviour suggests the protection of existing core breeding sites may be inadequate, with policy makers being required to consider the protection of broader areas to encompass potential changes in the habitat needs of this species.
published_date 2010-12-31T03:07:33Z
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score 11.037581

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