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Investigating differences in population recovery rates of two sympatrically nesting sea turtle species

L. C. M. Omeyer, Kimberley Stokes, D. Beton, B. A. Çiçek, S. Davey, W. J. Fuller, B. J. Godley, R. B. Sherley, R. T. E. Snape, A. C. Broderick

Animal Conservation, Volume: 24, Issue: 5, Pages: 832 - 846

Swansea University Author: Kimberley Stokes

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DOI (Published version): 10.1111/acv.12689

Abstract

Estimating life-history traits and understanding their variation underpins the management of long-lived, migratory animals, while knowledge of recovery dynamics can inform the management of conservation-dependent species. Using a combination of nest counts and individual-based life-history data coll...

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Published in: Animal Conservation
ISSN: 1367-9430 1469-1795
Published: Wiley 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa58565
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Using a combination of nest counts and individual-based life-history data collected since 1993, we explore the drivers underlying contrasting population recovery rates of sympatrically nesting loggerhead (Caretta caretta) and green (Chelonia mydas) turtles in North Cyprus. We found that nest counts of loggerhead and green turtles from 28 beaches across the island increased by 46% and 162%, respectively over the past 27 years. A Bayesian state-space model revealed that, at our individual-based monitoring site, nesting of green turtles increased annually at four times the rate of that of loggerhead turtles. Furthermore, we found that loggerhead turtles nesting at the individual-based monitoring site had stable reproductive parameters and average adult survival for the species and are the smallest breeding adults globally. Based on results from multiple matrix model scenarios, we propose that higher mortality rates of individuals in all age classes (likely driven by differences in life history and interaction with fisheries), rather than low reproductive output, are impeding the recovery of this species. While the increase in green turtles is encouraging, the Mediterranean population is estimated to have around 3,400 adults and is restricted to the Eastern Basin. The recovery of loggerhead turtles is likely to be compromised until mortality rates in the region are adequately quantified and mitigated. As survival of immature individuals is a powerful driver for sea turtle population numbers, additional efforts should target management at pelagic and neritic foraging areas. 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spelling 2021-11-25T18:32:57.1202064 v2 58565 2021-11-08 Investigating differences in population recovery rates of two sympatrically nesting sea turtle species 9ae3c7349402163dc0fbfe2e6dcd4dae Kimberley Stokes Kimberley Stokes true false 2021-11-08 SBI Estimating life-history traits and understanding their variation underpins the management of long-lived, migratory animals, while knowledge of recovery dynamics can inform the management of conservation-dependent species. Using a combination of nest counts and individual-based life-history data collected since 1993, we explore the drivers underlying contrasting population recovery rates of sympatrically nesting loggerhead (Caretta caretta) and green (Chelonia mydas) turtles in North Cyprus. We found that nest counts of loggerhead and green turtles from 28 beaches across the island increased by 46% and 162%, respectively over the past 27 years. A Bayesian state-space model revealed that, at our individual-based monitoring site, nesting of green turtles increased annually at four times the rate of that of loggerhead turtles. Furthermore, we found that loggerhead turtles nesting at the individual-based monitoring site had stable reproductive parameters and average adult survival for the species and are the smallest breeding adults globally. Based on results from multiple matrix model scenarios, we propose that higher mortality rates of individuals in all age classes (likely driven by differences in life history and interaction with fisheries), rather than low reproductive output, are impeding the recovery of this species. While the increase in green turtles is encouraging, the Mediterranean population is estimated to have around 3,400 adults and is restricted to the Eastern Basin. The recovery of loggerhead turtles is likely to be compromised until mortality rates in the region are adequately quantified and mitigated. As survival of immature individuals is a powerful driver for sea turtle population numbers, additional efforts should target management at pelagic and neritic foraging areas. Understanding threats faced by immature life stages is crucial to accurately parameterise population models and to target conservation actions for long-lived marine vertebrates. Journal Article Animal Conservation 24 5 832 846 Wiley 1367-9430 1469-1795 Nature and Landscape Conservation, Ecology 26 10 2021 2021-10-26 10.1111/acv.12689 COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University 2021-11-25T18:32:57.1202064 2021-11-08T09:39:01.0720933 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences L. C. M. Omeyer 1 Kimberley Stokes 2 D. Beton 3 B. A. Çiçek 4 S. Davey 5 W. J. Fuller 6 B. J. Godley 7 R. B. Sherley 8 R. T. E. Snape 9 A. C. Broderick 10 58565__21438__e3fc02132bef4e03aa8a816f060b47fe.pdf 58565.pdf 2021-11-08T09:41:50.5678812 Output 983915 application/pdf Version of Record true This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. true eng https://creativecommons.org/licenses/by/4.0/
title Investigating differences in population recovery rates of two sympatrically nesting sea turtle species
spellingShingle Investigating differences in population recovery rates of two sympatrically nesting sea turtle species
Kimberley Stokes
title_short Investigating differences in population recovery rates of two sympatrically nesting sea turtle species
title_full Investigating differences in population recovery rates of two sympatrically nesting sea turtle species
title_fullStr Investigating differences in population recovery rates of two sympatrically nesting sea turtle species
title_full_unstemmed Investigating differences in population recovery rates of two sympatrically nesting sea turtle species
title_sort Investigating differences in population recovery rates of two sympatrically nesting sea turtle species
author_id_str_mv 9ae3c7349402163dc0fbfe2e6dcd4dae
author_id_fullname_str_mv 9ae3c7349402163dc0fbfe2e6dcd4dae_***_Kimberley Stokes
author Kimberley Stokes
author2 L. C. M. Omeyer
Kimberley Stokes
D. Beton
B. A. Çiçek
S. Davey
W. J. Fuller
B. J. Godley
R. B. Sherley
R. T. E. Snape
A. C. Broderick
format Journal article
container_title Animal Conservation
container_volume 24
container_issue 5
container_start_page 832
publishDate 2021
institution Swansea University
issn 1367-9430
1469-1795
doi_str_mv 10.1111/acv.12689
publisher Wiley
college_str Faculty of Science and Engineering
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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 1
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description Estimating life-history traits and understanding their variation underpins the management of long-lived, migratory animals, while knowledge of recovery dynamics can inform the management of conservation-dependent species. Using a combination of nest counts and individual-based life-history data collected since 1993, we explore the drivers underlying contrasting population recovery rates of sympatrically nesting loggerhead (Caretta caretta) and green (Chelonia mydas) turtles in North Cyprus. We found that nest counts of loggerhead and green turtles from 28 beaches across the island increased by 46% and 162%, respectively over the past 27 years. A Bayesian state-space model revealed that, at our individual-based monitoring site, nesting of green turtles increased annually at four times the rate of that of loggerhead turtles. Furthermore, we found that loggerhead turtles nesting at the individual-based monitoring site had stable reproductive parameters and average adult survival for the species and are the smallest breeding adults globally. Based on results from multiple matrix model scenarios, we propose that higher mortality rates of individuals in all age classes (likely driven by differences in life history and interaction with fisheries), rather than low reproductive output, are impeding the recovery of this species. While the increase in green turtles is encouraging, the Mediterranean population is estimated to have around 3,400 adults and is restricted to the Eastern Basin. The recovery of loggerhead turtles is likely to be compromised until mortality rates in the region are adequately quantified and mitigated. As survival of immature individuals is a powerful driver for sea turtle population numbers, additional efforts should target management at pelagic and neritic foraging areas. Understanding threats faced by immature life stages is crucial to accurately parameterise population models and to target conservation actions for long-lived marine vertebrates.
published_date 2021-10-26T04:15:11Z
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