1
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Gulick AG, Ewen KA, Pollock CG, Hillis-Starr ZM. Trends in abundance and reproductive success of the hawksbill turtle nesting population at Buck Island Reef National Monument, St. Croix, U.S. Virgin Islands. ENDANGER SPECIES RES 2022. [DOI: 10.3354/esr01199] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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2
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Martinez-Estevez L, Amador JPC, Amador FC, Zilliacus KM, Pacheco AM, Seminoff JA, Lucero J, Oceguera K, Tershy BR, Croll DA. Spatial ecology of hawksbill sea turtles (Eretmochelys imbricata) in foraging habitats of the Gulf of California, Mexico. Glob Ecol Conserv 2021. [DOI: 10.1016/j.gecco.2021.e01540] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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3
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Omeyer LCM, Stokes KL, Beton D, Çiçek BA, Davey S, Fuller WJ, Godley BJ, Sherley RB, Snape RTE, Broderick AC. Investigating differences in population recovery rates of two sympatrically nesting sea turtle species. Anim Conserv 2021. [DOI: 10.1111/acv.12689] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- L. C. M. Omeyer
- Centre for Ecology and Conservation College of Life and Environmental Sciences University of Exeter Penryn UK
| | - K. L. Stokes
- Centre for Ecology and Conservation College of Life and Environmental Sciences University of Exeter Penryn UK
- Department of Biosciences Swansea University Singleton Park Swansea UK
| | - D. Beton
- Society for the Protection of Turtles Gönyeli North Cyprus
| | - B. A. Çiçek
- Faculty of Arts and Sciences Eastern Mediterranean University Famagusta North Cyprus
| | - S. Davey
- Society for the Protection of Turtles Gönyeli North Cyprus
| | - W. J. Fuller
- Society for the Protection of Turtles Gönyeli North Cyprus
- Faculty of Veterinary Medicine Near East University Nicosia North Cyprus
| | - B. J. Godley
- Centre for Ecology and Conservation College of Life and Environmental Sciences University of Exeter Penryn UK
| | - R. B. Sherley
- Centre for Ecology and Conservation College of Life and Environmental Sciences University of Exeter Penryn UK
| | - R. T. E. Snape
- Centre for Ecology and Conservation College of Life and Environmental Sciences University of Exeter Penryn UK
- Society for the Protection of Turtles Gönyeli North Cyprus
| | - A. C. Broderick
- Centre for Ecology and Conservation College of Life and Environmental Sciences University of Exeter Penryn UK
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4
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Levasseur KE, Stapleton SP, Quattro JM. Precise natal homing and an estimate of age at sexual maturity in hawksbill turtles. Anim Conserv 2020. [DOI: 10.1111/acv.12657] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- K. E. Levasseur
- Department of Biological Sciences University of South Carolina Columbia SC USA
- Jumby Bay Hawksbill Project St John’s Antigua and Barbuda
| | - S. P. Stapleton
- Jumby Bay Hawksbill Project St John’s Antigua and Barbuda
- Department of Fisheries, Wildlife and Conservation Biology University of Minnesota St. Paul MN USA
| | - J. M. Quattro
- Department of Biological Sciences University of South Carolina Columbia SC USA
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5
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Hawaiian hawksbills: a distinct and isolated nesting colony in the Central North Pacific Ocean revealed by mitochondrial DNA. CONSERV GENET 2020. [DOI: 10.1007/s10592-020-01287-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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6
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Oki K, Hamabata T, Arata T, Parker DM, Ng CKY, Balazs GH. Inferred Adult Foraging Grounds of Two Marine Turtle Species Nesting at Amami-Oshima, Japan. CHELONIAN CONSERVATION AND BIOLOGY 2019. [DOI: 10.2744/ccb-1337.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Katsuki Oki
- Amami Marine Life Association, 99-1 Nase-Hiramatsucho, Amami, Kagoshima, 894-0045, Japan []
| | - Tomoko Hamabata
- Graduate School of Life Science, Tohoku University, 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8578, Japan []
| | - Toshimitsu Arata
- Doren Camp-site, 2887-9 Ankyaba, Tatsugo-cho, Amami, Kagoshima, 894-0323, Japan []
| | | | - Connie Ka Yan Ng
- Department of Chemistry and State Key Laboratory in Marine Pollution, City University of Hong Kong, Hong Kong Special Administrative Region, People's Republic of China []
| | - George H. Balazs
- Golden Honu Services of Oceania, 992 Awaawaanoa Place, Honolulu, Hawaii 96825 USA []
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7
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Kendall WL, Stapleton S, White GC, Richardson JI, Pearson KN, Mason P. A multistate open robust design: population dynamics, reproductive effort, and phenology of sea turtles from tagging data. ECOL MONOGR 2018. [DOI: 10.1002/ecm.1329] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- William L. Kendall
- U. S. Geological Survey; Colorado Cooperative Fish and Wildlife Research Unit; Colorado State University; 1484 Campus Delivery Fort Collins Colorado 80523 USA
| | - Seth Stapleton
- Jumby Bay Hawksbill Project; Jumby Bay, St. John's Antigua West Indies
- Department of Fisheries, Wildlife, and Conservation Biology; University of Minnesota; St. Paul Minnesota 55108 USA
| | - Gary C. White
- Department of Fish, Wildlife, and Conservation Biology; Colorado State University; 1474 Campus Delivery Fort Collins Colorado 80523 USA
| | - James I. Richardson
- Jumby Bay Hawksbill Project; Jumby Bay, St. John's Antigua West Indies
- Odum School of Ecology; University of Georgia; Athens Georgia 30602 USA
| | - Kristen N. Pearson
- Colorado Cooperative Fish and Wildlife Research Unit; Colorado State University; 1484 Campus Delivery Fort Collins Colorado 80523 USA
| | - Peri Mason
- Jumby Bay Hawksbill Project; Jumby Bay, St. John's Antigua West Indies
- Biology Department; Bard High School Early College Queens; Queens New York 11101 USA
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8
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Roberts JD, Hamann M. Testing a recipe for effective recovery plan design: a marine turtle case study. ENDANGER SPECIES RES 2016. [DOI: 10.3354/esr00755] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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9
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Piacenza SE, Balazs GH, Hargrove SK, Richards PM, Heppell SS. Trends and variability in demographic indicators of a recovering population of green sea turtles Chelonia mydas. ENDANGER SPECIES RES 2016. [DOI: 10.3354/esr00753] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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10
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Placing Madagascar's marine turtle populations in a regional context using community-based monitoring. ORYX 2016. [DOI: 10.1017/s0030605315001398] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
AbstractMadagascar is an important foraging ground for marine turtles in the Western Indian Ocean, yet the status of the country's nesting aggregations remains poorly documented. We assess the current status and trend in nesting throughout Madagascar, including data recorded by a community-based monitoring project in the Barren Isles (western Madagascar). We contextualize the findings in comparison with data from Madagascar's closest neighbouring states. Reports indicate that nesting levels have declined at many coastal sites, with no known recordings since 2000 at > 40 nesting sites. We estimate there are a minimum of 1,200 nests per year in Madagascar, with the largest recorded nesting aggregation (< 1,000 nests per year) found on islands off the west and northern coasts. The majority of nesting aggregations, including those recorded by the community-based monitoring project in the Barren Isles, are relatively small, in the order of < 50 nests per year, yet they are potentially important sources of regional genetic diversity. Nesting on many of the islands (e.g. Tromelin, Europa) around Madagascar has increased over the last 20 years, despite the fact that thousands of turtles probably originating from these sites are taken by fishers in the waters of Madagascar annually. We discuss the importance of protecting small nesting populations, and how community-based monitoring could be an important tool for conserving remote and vulnerable populations and building capacity for natural resource management.
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11
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Van Houtan KS, Francke DL, Alessi S, Jones TT, Martin SL, Kurpita L, King CS, Baird RW. The developmental biogeography of hawksbill sea turtles in the North Pacific. Ecol Evol 2016; 6:2378-89. [PMID: 27110350 PMCID: PMC4834323 DOI: 10.1002/ece3.2034] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 01/30/2016] [Accepted: 02/04/2016] [Indexed: 12/14/2022] Open
Abstract
High seas oceanic ecosystems are considered important habitat for juvenile sea turtles, yet much remains cryptic about this important life‐history period. Recent progress on climate and fishery impacts in these so‐called lost years is promising, but the developmental biogeography of hawksbill sea turtles (Eretmochelys imbricata) has not been widely described in the Pacific Ocean. This knowledge gap limits the effectiveness of conservation management for this globally endangered species. We address this with 30 years of stranding observations, 20 years of bycatch records, and recent simulations of natal dispersal trajectories in the Hawaiian Archipelago. We synthesize the analyses of these data in the context of direct empirical observations, anecdotal sightings, and historical commercial harvests from the insular Pacific. We find hawksbills 0–4 years of age, measuring 8–34 cm straight carapace length, are found predominantly in the coastal pelagic waters of Hawaii. Unlike other species, we find no direct evidence of a prolonged presence in oceanic habitats, yet satellite tracks of passive drifters (simulating natal dispersal) and our small sample sizes suggest that an oceanic phase for hawksbills cannot be dismissed. Importantly, despite over 600 million hooks deployed and nearly 6000 turtle interactions, longline fisheries have never recorded a single hawksbill take. We address whether the patterns we observe are due to population size and gear selectivity. Although most sea turtle species demonstrate clear patterns of oceanic development, hawksbills in the North Pacific may by contrast occupy a variety of ecosystems including coastal pelagic waters and shallow reefs in remote atolls. This focuses attention on hazards in these ecosystems – entanglement and ingestion of marine debris – and perhaps away from longline bycatch and decadal climate regimes that affect sea turtle development in oceanic regions.
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Affiliation(s)
- Kyle S Van Houtan
- NOAA Fisheries Pacific Islands Fisheries Science Center Honolulu Hawaii 96818; Nicholas School of the Environment Duke University Durham North Carolina 27708; Present address: Monterey Bay Aquarium Monterey California 93940
| | - Devon L Francke
- Joint Institute for Marine and Atmospheric Research University of Hawaii Honolulu Hawaii 96822
| | - Sarah Alessi
- Joint Institute for Marine and Atmospheric Research University of Hawaii Honolulu Hawaii 96822
| | - T Todd Jones
- NOAA Fisheries Pacific Islands Fisheries Science Center Honolulu Hawaii 96818
| | - Summer L Martin
- National Research Council National Academy of Sciences Washington District of Columbia 20001
| | - Lauren Kurpita
- Pacific Cooperative Studies Unit University of Hawaii Honolulu Hawaii 96822; World Turtle Trust Kailua Hawaii 96734
| | | | - Robin W Baird
- Cascadia Research Collective Olympia Washington 98501
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12
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Reising M, Salmon M, Stapleton S. Hawksbill nest site selection affects hatchling survival at a rookery in Antigua, West Indies. ENDANGER SPECIES RES 2015. [DOI: 10.3354/esr00708] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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13
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Stokes KL, Fuller WJ, Glen F, Godley BJ, Hodgson DJ, Rhodes KA, Snape RTE, Broderick AC. Detecting green shoots of recovery: the importance of long-term individual-based monitoring of marine turtles. Anim Conserv 2014. [DOI: 10.1111/acv.12128] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- K. L. Stokes
- Centre for Ecology and Conservation; University of Exeter; Penryn UK
| | - W. J. Fuller
- Centre for Ecology and Conservation; University of Exeter; Penryn UK
- Faculty of Veterinary Medicine; Near East University; Nicosia North Cyprus Turkey
- Society for Protection of Turtles; Kyrenia North Cyprus Turkey
| | - F. Glen
- 16 Eshton Terrace Clitheroe Lancashire UK
| | - B. J. Godley
- Centre for Ecology and Conservation; University of Exeter; Penryn UK
| | - D. J. Hodgson
- Centre for Ecology and Conservation; University of Exeter; Penryn UK
| | - K. A. Rhodes
- Centre for Ecology and Conservation; University of Exeter; Penryn UK
| | - R. T. E. Snape
- Centre for Ecology and Conservation; University of Exeter; Penryn UK
- Society for Protection of Turtles; Kyrenia North Cyprus Turkey
| | - A. C. Broderick
- Centre for Ecology and Conservation; University of Exeter; Penryn UK
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14
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Proietti MC, Reisser J, Marins LF, Rodriguez-Zarate C, Marcovaldi MA, Monteiro DS, Pattiaratchi C, Secchi ER. Genetic structure and natal origins of immature hawksbill turtles (Eretmochelys imbricata) in Brazilian waters. PLoS One 2014; 9:e88746. [PMID: 24558419 PMCID: PMC3928279 DOI: 10.1371/journal.pone.0088746] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Accepted: 01/10/2014] [Indexed: 11/19/2022] Open
Abstract
Understanding the connections between sea turtle populations is fundamental for their effective conservation. Brazil hosts important hawksbill feeding areas, but few studies have focused on how they connect with nesting populations in the Atlantic. Here, we (1) characterized mitochondrial DNA control region haplotypes of immature hawksbills feeding along the coast of Brazil (five areas ranging from equatorial to temperate latitudes, 157 skin samples), (2) analyzed genetic structure among Atlantic hawksbill feeding populations, and (3) inferred natal origins of hawksbills in Brazilian waters using genetic, oceanographic, and population size information. We report ten haplotypes for the sampled Brazilian sites, most of which were previously observed at other Atlantic feeding grounds and rookeries. Genetic profiles of Brazilian feeding areas were significantly different from those in other regions (Caribbean and Africa), and a significant structure was observed between Brazilian feeding grounds grouped into areas influenced by the South Equatorial/North Brazil Current and those influenced by the Brazil Current. Our genetic analysis estimates that the studied Brazilian feeding aggregations are mostly composed of animals originating from the domestic rookeries Bahia and Pipa, but some contributions from African and Caribbean rookeries were also observed. Oceanographic data corroborated the local origins, but showed higher connection with West Africa and none with the Caribbean. High correlation was observed between origins estimated through genetics/rookery size and oceanographic/rookery size data, demonstrating that ocean currents and population sizes influence haplotype distribution of Brazil's hawksbill populations. The information presented here highlights the importance of national conservation strategies and international cooperation for the recovery of endangered hawksbill turtle populations.
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Affiliation(s)
- Maira C. Proietti
- Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul, Brazil
- * E-mail:
| | - Julia Reisser
- Oceans Institute and School of Civil, Environmental and Mining Engineering, The University of Western Australia, Perth, Western Australia, Australia
- Wealth from Oceans Flagship, Commonwealth Scientific and Industrial Research Organisation, Floreat, Western Australia, Australia
| | - Luis Fernando Marins
- Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul, Brazil
| | - Clara Rodriguez-Zarate
- School of Biological Sciences, Flinders University, Adelaide, South Australia, Australia
| | | | - Danielle S. Monteiro
- Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul, Brazil
- Núcleo de Educação e Monitoramento Ambiental, Rio Grande, Rio Grande do Sul, Brazil
| | - Charitha Pattiaratchi
- Oceans Institute and School of Civil, Environmental and Mining Engineering, The University of Western Australia, Perth, Western Australia, Australia
| | - Eduardo R. Secchi
- Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul, Brazil
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15
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Labrada-Martagón V, Zenteno-Savín T, Mangel M. Linking physiological approaches to marine vertebrate conservation: using sex steroid hormone determinations in demographic assessments. CONSERVATION PHYSIOLOGY 2014; 2:cot035. [PMID: 27293619 PMCID: PMC4732477 DOI: 10.1093/conphys/cot035] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Revised: 11/20/2013] [Accepted: 12/01/2013] [Indexed: 05/26/2023]
Abstract
Sex, age and sexual maturation are key biological parameters for aspects of life history and are fundamental information for assessing demographic changes and the reproductive viability and performance of natural populations under exploitation pressures or in response to environmental influences. Much of the information available on the reproductive condition, length at sexual maturity and sex determinations of endangered species has been derived from direct examination of the gonads in dead animals, either intentionally or incidentally caught, or from stranded individuals. However, morphological data, when used alone, do not provide accurate demographic information in sexually monomorphic marine vertebrate species (e.g. sharks, sea turtles, seabirds and cetaceans). Hormone determination is an accurate and non-destructive method that provides indirect information about sex, reproductive condition and sexual maturity of free-ranging individuals. Correlations between sex steroid concentrations and biochemical parameters, gonadal development and state, reproductive behaviour and secondary external features have been already demonstrated in many species. Different non-lethal approaches (e.g. surgical and mark-recapture procedures), with intrinsic advantages and disadvantages when applied on free-ranging organisms, have been proposed to asses sex, growth and reproductive condition. Hormone determination from blood samples will generate valuable additional demographic information needed for stock assessment and biological conservation.
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Affiliation(s)
- Vanessa Labrada-Martagón
- Center for Stock Assessment Research, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
- Programa de Planeación Ambiental y Conservación, Centro de Investigaciones Biológicas del Noroeste, S.C., La Paz, Baja California Sur, México C.P. 23096
| | - Tania Zenteno-Savín
- Programa de Planeación Ambiental y Conservación, Centro de Investigaciones Biológicas del Noroeste, S.C., La Paz, Baja California Sur, México C.P. 23096
| | - Marc Mangel
- Center for Stock Assessment Research, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
- Department of Biology, University of Bergen, Bergen 5020, Norway
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16
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Santos AJB, Bellini C, Vieira DHG, Neto LD, Corso G. Northeast Brazil shows highest hawksbill turtle nesting density in the South Atlantic. ENDANGER SPECIES RES 2013. [DOI: 10.3354/esr00505] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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17
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Abstract
AbstractNesting by marine turtles in the Caribbean has declined considerably, mainly because of human exploitation, but there has previously been no monitoring in the Dominican Republic. We present the first detailed assessment of the status of marine turtle nesting in the country, based on surveys during 2006–2010. Nesting populations of hawksbill Eretmochelys imbricata and leatherback turtle Dermochelys coriacea are of regional importance and the green turtle Chelonia mydas is still present, although nesting in low numbers. The two main nesting sites are within protected areas: the Jaragua National Park in the south-west, important for leatherback turtles (mean of 126 nests per season), and Del Este National Park on Saona Island in the south-east, principally for hawksbill turtles (mean of 100 nests per season). Comparison with historical data suggests all rookeries are profoundly reduced in size. Although the main nesting beaches are within protected areas, illegal egg-take and meat consumption continues there, and also elsewhere in the country.
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18
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Dow Piniak WE, Eckert KL. Sea turtle nesting habitat in the Wider Caribbean Region. ENDANGER SPECIES RES 2011. [DOI: 10.3354/esr00375] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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19
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Bell CD, Blumenthal JM, Broderick AC, Godley BJ. Investigating potential for depensation in marine turtles: how low can you go? CONSERVATION BIOLOGY : THE JOURNAL OF THE SOCIETY FOR CONSERVATION BIOLOGY 2010; 24:226-235. [PMID: 19723137 DOI: 10.1111/j.1523-1739.2009.01313.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Where mechanisms inherent within the biology of a species affect individual fitness at low density, demographic-scale depensation may occur, hastening further decline and leading ultimately to population extirpation and species extinction. Reduction in fertility at low population densities has been identified in marine and terrestrial species. Using data on hatch success and hatchling-emergence success as proxies for fertilization success, we conducted a global meta-analysis of data from breeding aggregations of green turtles (Chelonia mydas) and loggerhead turtles (Caretta caretta). We found that there has been no reduction in fertility in small nesting aggregations in either of these species worldwide. We considered mechanisms within the mating strategies and reproductive biology of marine turtles that may allow for novel genetic input and facilitate enhanced gene flow among rookeries. Behavioral reproductive mechanisms, such as natal philopatry and polyandry, may mitigate potential impacts of depensation and contribute to the resilience of these species.
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Affiliation(s)
- C D Bell
- Marine Turtle Research Group, Centre for Ecology and Conservation, University of Exeter, Cornwall Campus, Penryn TR10 9E2, United Kingdom
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20
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Richardson PB, Bruford MW, Calosso MC, Campbell LM, Clerveaux W, Formia A, Godley BJ, Henderson AC, McClellan K, Newman S, Parsons K, Pepper M, Ranger S, Silver JJ, Slade L, Broderick AC. Marine Turtles in the Turks and Caicos Islands: Remnant Rookeries, Regionally Significant Foraging Stocks, and a Major Turtle Fishery. CHELONIAN CONSERVATION AND BIOLOGY 2009. [DOI: 10.2744/ccb-0871.1] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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21
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Blumenthal JM, Abreu-Grobois FA, Austin TJ, Broderick AC, Bruford MW, Coyne MS, Ebanks-Petrie G, Formia A, Meylan PA, Meylan AB, Godley BJ. Turtle groups or turtle soup: dispersal patterns of hawksbill turtles in the Caribbean. Mol Ecol 2009; 18:4841-53. [PMID: 19889039 DOI: 10.1111/j.1365-294x.2009.04403.x] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Despite intense interest in conservation of marine turtles, spatial ecology during the oceanic juvenile phase remains relatively unknown. Here, we used mixed stock analysis and examination of oceanic drift to elucidate movements of hawksbill turtles (Eretmochelys imbricata) and address management implications within the Caribbean. Among samples collected from 92 neritic juvenile hawksbills in the Cayman Islands we detected 11 mtDNA control region haplotypes. To estimate contributions to the aggregation, we performed 'many-to-many' mixed stock analysis, incorporating published hawksbill genetic and population data. The Cayman Islands aggregation represents a diverse mixed stock: potentially contributing source rookeries spanned the Caribbean basin, delineating a scale of recruitment of 200-2500 km. As hawksbills undergo an extended phase of oceanic dispersal, ocean currents may drive patterns of genetic diversity observed on foraging aggregations. Therefore, using high-resolution Aviso ocean current data, we modelled movement of particles representing passively drifting oceanic juvenile hawksbills. Putative distribution patterns varied markedly by origin: particles from many rookeries were broadly distributed across the region, while others would appear to become entrained in local gyres. Overall, we detected a significant correlation between genetic profiles of foraging aggregations and patterns of particle distribution produced by a hatchling drift model (Mantel test, r = 0.77, P < 0.001; linear regression, r = 0.83, P < 0.001). Our results indicate that although there is a high degree of mixing across the Caribbean (a 'turtle soup'), current patterns play a substantial role in determining genetic structure of foraging aggregations (forming turtle groups). Thus, for marine turtles and other widely distributed marine species, integration of genetic and oceanographic data may enhance understanding of population connectivity and management requirements.
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Affiliation(s)
- J M Blumenthal
- Department of Environment, Box 486, Grand Cayman KY1-1106, Cayman Islands
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22
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Population subdivision in hawksbill turtles nesting on Barbados, West Indies, determined from mitochondrial DNA control region sequences. CONSERV GENET 2009. [DOI: 10.1007/s10592-009-9883-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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23
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Poloczanska ES, Limpus CJ, Hays GC. Chapter 2. Vulnerability of marine turtles to climate change. ADVANCES IN MARINE BIOLOGY 2009; 56:151-211. [PMID: 19895975 DOI: 10.1016/s0065-2881(09)56002-6] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Marine turtles are generally viewed as vulnerable to climate change because of the role that temperature plays in the sex determination of embryos, their long life history, long age-to-maturity and their highly migratory nature. Extant species of marine turtles probably arose during the mid-late Jurassic period (180-150 Mya) so have survived past shifts in climate, including glacial periods and warm events and therefore have some capacity for adaptation. The present-day rates of increase of atmospheric greenhouse gas concentrations, and associated temperature changes, are very rapid; the capacity of marine turtles to adapt to this rapid change may be compromised by their relatively long generation times. We consider the evidence and likely consequences of present-day trends of climate change on marine turtles. Impacts are likely to be complex and may be positive as well as negative. For example, rising sea levels and increased storm intensity will negatively impact turtle nesting beaches; however, extreme storms can also lead to coastal accretion. Alteration of wind patterns and ocean currents will have implications for juveniles and adults in the open ocean. Warming temperatures are likely to impact directly all turtle life stages, such as the sex determination of embryos in the nest and growth rates. Warming of 2 degrees C could potentially result in a large shift in sex ratios towards females at many rookeries, although some populations may be resilient to warming if female biases remain within levels where population success is not impaired. Indirectly, climate change is likely to impact turtles through changes in food availability. The highly migratory nature of turtles and their ability to move considerable distances in short periods of time should increase their resilience to climate change. However, any such resilience of marine turtles to climate change is likely to be severely compromised by other anthropogenic influences. Development of coastlines may threaten nesting beaches and reproductive success, and pollution and eutrophication is threatening important coastal foraging habitats for turtles worldwide. Exploitation and bycatch in other fisheries has seriously reduced marine turtle populations. The synergistic effects of other human-induced stressors may seriously reduce the capacity of some turtle populations to adapt to the current rates of climate change. Conservation recommendations to increase the capacity of marine turtle populations to adapt to climate change include increasing population resilience, for example by the use of turtle exclusion devices in fisheries, protection of nesting beaches from the viewpoints of both conservation and coastal management, and increased international conservation efforts to protect turtles in regions where there is high unregulated or illegal fisheries (including turtle harvesting). Increasing research efforts on the critical knowledge gaps of processes influencing population numbers, such as identifying ocean foraging hotspots or the processes that underlie the initiation of nesting migrations and selection of breeding areas, will inform adaptive management in a changing climate.
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Affiliation(s)
- Elvira S Poloczanska
- Climate Adaptation Flagship, CSIRO Marine and Atmospheric Research, Cleveland, Queensland 4163, Australia
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Ficetola GF. Impacts of Human Activities and Predators on the Nest Success of the Hawksbill Turtle, Eretmochelys imbricata, in the Arabian Gulf. CHELONIAN CONSERVATION AND BIOLOGY 2008. [DOI: 10.2744/ccb-0700.1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Miro-Herrans AT, Velez-Zuazo X, Acevedo JP, McMillan WO. Isolation and characterization of novel microsatellites from the critically endangered hawksbill sea turtle (Eretmochelys imbricata). Mol Ecol Resour 2008; 8:1098-101. [PMID: 21585983 DOI: 10.1111/j.1755-0998.2008.02143.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We isolated and characterized 12 microsatellite loci from the hawksbill sea turtle (Eretmochelys imbricata). The loci exhibited a variable number of alleles that ranged from three to 14 with an average observed heterozygosity of 0.70 (SD 0.18) across 40 hawksbill turtles from the Caribbean. The polymorphism exhibited individually and in combination makes them suitable for fine-scale genetic studies. In particular, the low probability of identity and high paternity exclusion of these markers makes them highly useful for parentage and relatedness studies. These new markers greatly increase the power of genetic studies directed towards the conservation of this endangered species.
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Affiliation(s)
- Aida T Miro-Herrans
- Department of Biology, University of Puerto Rico, PO Box 23360, San Juan, Puerto Rico 00931
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McGowan A, Broderick AC, Frett G, Gore S, Hastings M, Pickering A, Wheatley D, White J, Witt MJ, Godley BJ. Down but not out: marine turtles of the British Virgin Islands. Anim Conserv 2008. [DOI: 10.1111/j.1469-1795.2007.00152.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
The seven species of sea turtles occupy a diversity of niches, and have a history tracing back over 100 million years, yet all share basic life-history features, including exceptional navigation skills and periodic migrations from feeding to breeding habitats. Here, we review the biogeographic, behavioural, and ecological factors that shape the distribution of genetic diversity in sea turtles. Natal homing, wherein turtles return to their region of origin for mating and nesting, has been demonstrated with mtDNA sequences. These maternally inherited markers show strong population structure among nesting colonies while nuclear loci reveal a contrasting pattern of male-mediated gene flow, a phenomenon termed 'complex population structure'. Mixed-stock analyses indicate that multiple nesting colonies can contribute to feeding aggregates, such that exploitation of turtles in these habitats can reduce breeding populations across the region. The mtDNA data also demonstrate migrations across entire ocean basins, some of the longest movements of marine vertebrates. Multiple paternity occurs at reported rates of 0-100%, and can vary by as much as 9-100% within species. Hybridization in almost every combination among members of the Cheloniidae has been documented but the frequency and ultimate ramifications of hybridization are not clear. The global phylogeography of sea turtles reveals a gradient based on habitat preference and thermal regime. The cold-tolerant leatherback turtle (Dermochelys coriacea) shows no evolutionary partitions between Indo-Pacific and Atlantic populations, while the tropical green (Chelonia mydas), hawksbill (Eretmochelys imbricata), and ridleys (Lepidochelys olivacea vs. L. kempi) have ancient separations between oceans. Ridleys and loggerhead (Caretta caretta) also show more recent colonization between ocean basins, probably mediated by warm-water gyres that occasionally traverse the frigid upwelling zone in southern Africa. These rare events may be sufficient to prevent allopatric speciation under contemporary geographic and climatic conditions. Genetic studies have advanced our understanding of marine turtle biology and evolution, but significant gaps persist and provide challenges for the next generation of sea turtle geneticists.
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Affiliation(s)
- B W Bowen
- Hawaii Institute of Marine Biology, University of Hawaii, PO Box 1346, Kaneohe, HI 96744, USA.
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Godfrey MH, Webb GJW, Manolis SC, Mrosovsky N. Hawksbill sea turtles: can phylogenetics inform harvesting? Mol Ecol 2007; 16:3511-3; discussion 3514-7. [PMID: 17845423 DOI: 10.1111/j.1365-294x.2007.03356.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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MORTIMER JEANNEA, DONNELLY MARYDELE, MEYLAN ANNEB, MEYLAN PETERA. Critically endangered hawksbill turtles: molecular genetics and the broad view of recovery. Mol Ecol 2007. [DOI: 10.1111/j.1365-294x.2007.03432.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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