Environmental Warming and Feminization of One of the Largest Sea Turtle Populations in the World

Current Biology, Journal Year: 2018, Volume and Issue: 28(1), P. 154 - 159.e4

Published: Jan. 1, 2018

Climate change affects species and ecosystems around the globe [1Root T.L. Price J.T. Hall K.R. Schneider S.H. Rosenzweig C. Pounds J.A. Fingerprints of global warming on wild animals plants.Nature. 2003; 421: 57-60Crossref PubMed Scopus (3505) Google Scholar]. The impacts rising temperature are particularly pertinent in with temperature-dependent sex determination (TSD), where an individual is determined by incubation during embryonic development [2Janzen F.J. reptiles.Proc. Natl. Acad. Sci. USA. 1994; 91: 7487-7490Crossref (380) In sea turtles, proportion female hatchlings increases temperature. With average predicted to increase 2.6°C 2100 [3Intergovernmental Panel ChangeClimate Change 2014: Synthesis Report, Core Writing Team.in: Pachauri R.K. Meyer L. Intergovernmental Change, Geneva2014Crossref Scholar], many turtle populations danger high egg mortality female-only offspring production. Unfortunately, determining ratios at nesting beaches carries both logistical ethical complications. However, ratio data obtained foraging grounds provides information amalgamation immature adult turtles hatched from different over years. Here, for first time, we use genetic markers a mixed-stock analysis (MSA), combined through laparoscopy endocrinology, link male green Great Barrier Reef (GBR) beach which they hatched. Our results show moderate bias (65%–69% female) originating cooler southern GBR beaches, while warmer northern were extremely female-biased (99.1% juvenile, 99.8% subadult, 86.8% adult-sized turtles). Combining our that rookeries have been producing primarily females more than two decades complete feminization this population possible near future.

Language: Английский

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Mediterranean sea turtles: current knowledge and priorities for conservation and research

Endangered Species Research, Journal Year: 2018, Volume and Issue: 36, P. 229 - 267

Published: May 17, 2018

ESR Endangered Species Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 36:229-267 (2018) - DOI: https://doi.org/10.3354/esr00901 REVIEW Mediterranean sea turtles: current knowledge and priorities for conservation research Paolo Casale1,*, Annette C. Broderick2, Juan Antonio Camiñas3,4, Luis Cardona5, Carlos Carreras6, Andreas Demetropoulos7, Wayne J. Fuller8, Brendan Godley2, Sandra Hochscheid9, Yakup Kaska10, Bojan Lazar11,12, Dimitris Margaritoulis13, Aliki Panagopoulou13,14, ALan F. Rees2,13, Jesús Tomás15, Oguz Türkozan16 1Department of Biology, University Pisa, Via A. Volta 6, 56126 Italy Addresses other authors are given in Supplement at www.int-res.com/articles/suppl/n036p229_supp.pdf *Corresponding author: [email protected] ABSTRACT: The available information regarding 2 turtle species breeding (loggerhead Caretta caretta green Chelonia mydas) is reviewed, including biometrics morphology, identification foraging areas, ecology behaviour, abundance trends, population structure dynamics, anthropogenic threats measures. Although a large body has been generated, efforts have inconsistently allocated across geographic topics. Significant gaps still exist, ranging from most fundamental aspects, such as distribution major nesting sites total number clutches laid annually region, more specific topics like age maturity, survival rates behavioural ecology, especially certain areas (e.g. south-eastern Mediterranean). These particularly marked turtle. recent positive trends nest counts some may be result cessation past exploitation decades measures on land, both form national regulations continued active protection clutches. Therefore, status should considered dependent ongoing efforts. Mitigation incidental catch fisheries, main threat sea, its infancy. From analysis present comprehensive proposed. KEY WORDS: · mydas Nesting Foraging grounds Population Behavioural Biometrics Full text pdf format Supplementary material PreviousNextCite this article as: Casale P, Broderick AC, Camiñas JA, Cardona L others research. Endang Res 36:229-267. Export citation Tweet linkedIn Cited by Published Vol. 36. Online publication date: August 01, 2018 Print ISSN: 1863-5407; 1613-4796 Copyright © Inter-Research.

Language: Английский

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Climate change and marine turtles: recent advances and future directions

Endangered Species Research, Journal Year: 2021, Volume and Issue: 44, P. 363 - 395

Published: Jan. 13, 2021

Climate change is a threat to marine turtles that expected affect all of their life stages. To guide future research, we conducted review the most recent literature on this topic, highlighting knowledge gains and research gaps since similar previous in 2009. Most has been focussed terrestrial history phase, where impacts will range from habitat loss decreased reproductive success feminization populations, but changes periodicity, shifts latitudinal ranges, foraging are phase. Models have proposed improve estimates primary sex ratios, while technological advances promise better understanding how climate can influence different stages habitats. We suggest number priorities for an improved may impact turtles, including: assessments implications female-biased ratios reduced male production, variability upper thermal limits clutches, models beach sediment movement under sea level rise, grounds. Lastly, it not yet possible recommend manipulating aspects turtle nesting ecology, as evidence base with which understand results such interventions robust enough, strategies mitigation stressors should be helpful, providing they consider synergistic effects other anthropogenic-induced threats focus increasing resilience.

Language: Английский

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A global review of marine turtle entanglement in anthropogenic debris: a baseline for further action

Endangered Species Research, Journal Year: 2017, Volume and Issue: 34, P. 431 - 448

Published: Sept. 27, 2017

ESR Endangered Species Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 34:431-448 (2017) - DOI: https://doi.org/10.3354/esr00865 Special: Marine pollution and endangered species REVIEW A global review of marine turtle entanglement in anthropogenic debris: a baseline for further action Emily M. Duncan1,2,3,*, Zara L. R. Botterell1,*, Annette C. Broderick1, Tamara S. Galloway2, Penelope K. Lindeque3, Ana Nuno1, Brendan J. Godley1,** 1Marine Turtle Group, Centre Ecology Conservation, University Exeter, Penryn TR10 9FE, UK 2Biosciences, College Life Environmental Sciences, Geoffrey Pope Building, Stocker Road, Exeter EX4 4QD, 3Marine Biodiversity, Plymouth Laboratory, Prospect Place, West Hoe, PL1 3DH, *These authors contributed equally this work**Corresponding author: [email protected] ABSTRACT: Entanglement debris poses threat wildlife. Although is recognised as cause mortality, there remain quantitative knowledge gaps on rates population implications. We provide summary issue taxon using mixed methods approach, including literature expert opinions from conservation scientists practitioners worldwide. The yielded 23 reports debris, which included records 6 species, all ocean basins. Our experts reported occurrence turtles found entangled across life stages basins, with suggestions particular vulnerability pelagic juvenile stages. Numbers stranded encountered by 106 respondents were thousands per year, 5.5% entangled; 90.6% these dead. Of questioned, 84% consider that could be causing level effects some areas. Lost or discarded fishing materials, known ‘ghost gear’, majority entanglements land-based sources distinct minority. Surveyed rated greater than oil pollution, climate change direct exploitation but less plastic ingestion fisheries bycatch. challenges, research needs priority actions facing are discussed pathways begin resolve understand issue. Collaboration among stakeholder groups such strandings networks, sector scientific community will facilitate development mitigating actions. KEY WORDS: Conservation · Ghost Plastic Sea Strandings Full text pdf format Supplementary material PreviousNextCite article as: Duncan EM, Botterell ZLR, Broderick AC, Galloway TS, Lindeque PK, Nuno A, Godley BJ action. Endang Res 34:431-448. Export citation Tweet linkedIn Cited Published Vol. 34. Online publication date: December 11, 2017 Print ISSN: 1863-5407; 1613-4796 Copyright © Inter-Research.

Language: Английский

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Operational Protocols for the Use of Drones in Marine Animal Research

Drones, Journal Year: 2020, Volume and Issue: 4(4), P. 64 - 64

Published: Sept. 25, 2020

The use of drones to study marine animals shows promise for the examination numerous aspects their ecology, behaviour, health and movement patterns. However, responses some phyla presence varies broadly, as do general operational protocols used them. Inconsistent methodological approaches could lead difficulties comparing studies can call into question repeatability research. This review draws on current literature researchers with a wealth practical experience outline idiosyncrasies studying various taxa drones. We also best practice drone operation in environments based our field. outlined herein will be interested incorporating tool research help form consistent drone-based future.

Language: Английский

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Satellite Tracking Sea Turtles: Opportunities and Challenges to Address Key Questions

Frontiers in Marine Science, Journal Year: 2018, Volume and Issue: 5

Published: Nov. 20, 2018

Over 25 years ago the first satellite tracking studies of sea turtles were published. The technology and attachment methods have now come age with long-term tracks over a year being commonplace ability to relay high resolution GPS locations via Argos system along behavioural (e.g. diving activity) environmental temperature) data. Early focused on breeding females because they ashore nest, allowing individuals be restrained relatively easily for tag attachment. However, today development capture at are increasingly both adult male as well immature small 11cm carapace length. Here we review extent work after many thousands individual been tracked. We consider state-of-the-art equipment how this is used tackle key questions. highlight some emerging opportunities arising from improved spatial tracking, increased robustness miniaturisation tags increasing availability huge potential big-data make use that exist, although discuss long-standing challenges surrounding data accessibility.

Language: Английский

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The potential of unmanned aerial systems for sea turtle research and conservation: a review and future directions

Endangered Species Research, Journal Year: 2017, Volume and Issue: 35, P. 81 - 100

Published: Dec. 11, 2017

ESR Endangered Species Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 35:81-100 (2018) - DOI: https://doi.org/10.3354/esr00877 Special: Drones in conservation research REVIEW The potential of unmanned aerial systems for sea turtle and conservation: a review future directions ALan F. Rees1,*, Larisa Avens2, Katia Ballorain3,4, Elizabeth Bevan5, Annette C. Broderick1, Raymond R. Carthy6, Marjolijn J. A. Christianen7,8, Gwénaël Duclos9, Michael Heithaus10, David W. Johnston11, Jeffrey Mangel1,12, Frank Paladino13, Kellie Pendoley14, Richard D. Reina15, Nathan Robinson16, Robert Ryan17, Seth T. Sykora-Bodie11, Dominic Tilley1, Miguel Varela1, Whitman10, Paul Whittock14, Thane Wibbels5, Brendan Godley1 1Marine Turtle Group, Centre Ecology Conservation, College Life Environmental Sciences, University Exeter, Penryn Campus, Cornwall TR10 9FE, UK Addresses other authors are given Supplement 1 at www.int-res.com/articles/suppl/n035p081_supp/ *Corresponding author: [email protected] ABSTRACT: use satellite manned aircraft surveys remote data collection has been shown be transformative by enabling on turtles their habitats over larger areas than can achieved foot or boat. Unmanned vehicles (UAVs) drones increasingly being adopted gather data, previously unprecedented spatial temporal resolutions diverse geographic locations. This easily accessible, low-cost tool is improving existing methods novel approaches marine ecology conservation. Here we ways which incorporating inexpensive UAVs may reduce costs field time while safety quality quantity studies nesting, at-sea distribution behaviour surveys, as well expanding into new avenues such surveillance against illegal take. Furthermore, highlight impact that high-quality imagery captured have public outreach engagement. technology does not come without challenges. We discuss constraints these within ethical legal frameworks researchers must operate difficulties result with regard storage analysis large amounts imagery. then suggest where technological development could further expand utility data-gathering tools; example, functioning downloading nodes collected sensors placed turtles. Development will serve case terrestrial taxa. KEY WORDS: Drone · UAV Aerial survey Sea Behaviour Conservation Population biology Full text pdf format Supplementary material PreviousNextCite this article as: Rees AF, Avens L, Ballorain K, Bevan E others directions. Endang Res 35:81-100. Export citation Tweet linkedIn Cited Published Vol. 35. Online publication date: February 19, 2018 Print ISSN: 1863-5407; 1613-4796 Copyright © Inter-Research.

Language: Английский

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Drones for research on sea turtles and other marine vertebrates – A review

Biological Conservation, Journal Year: 2019, Volume and Issue: 238, P. 108214 - 108214

Published: Sept. 5, 2019

Language: Английский

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The true depth of the Mediterranean plastic problem: Extreme microplastic pollution on marine turtle nesting beaches in Cyprus

Marine Pollution Bulletin, Journal Year: 2018, Volume and Issue: 136, P. 334 - 340

Published: Sept. 22, 2018

Language: Английский

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A global review of green turtle diet: sea surface temperature as a potential driver of omnivory levels

Marine Biology, Journal Year: 2020, Volume and Issue: 167(12)

Published: Nov. 16, 2020

Abstract To better understand dietary requirements, trophic shifts, and interactions of the threatened green turtle ( Chelonia mydas ), we conducted a comprehensive global review literature tabulation (177 studies) reporting diets individuals > 25 cm carapace length. We analysed those studies involving natural sites healthy animals that reported relative proportions all diet components (67 studies, 89 datasets at 75 sites, 13 geographic sub-regions, 3 oceans). compared by sub-region foraging site to four components, i.e., seagrass, macroalgae, terrestrial plants (including mangroves) animal matter. assess sea surface temperature (SST) as an environmental driver, values were extracted from satellite data (single year) site-specific observations (study durations) examined composition. Satellite indicated warmer with temperatures °C (≥ 6 months annually), was predominantly herbivorous (mean = 92.97%; SE 9.85; n 69 datasets). At higher latitude in cold-water currents SST < 20 matter featured prominently 51.47%; 4.84; Site-specific had small but significant effect on contributions r 2 0.17, P 0.001) seagrass 0.24, not macroalgae plants. Our study presents first quantitative evidence scale may be important driver omnivory, providing new perspective variations diet, especially light warming climate change.

Language: Английский

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