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Okuyama J, Watabe A, Takuma S, Tanaka K, Shirai K, Murakami‐Sugihara N, Arita M, Fujita K, Nishizawa H, Narazaki T, Yamashita Y, Kameda K. Latitudinal cline in the foraging dichotomy of loggerhead sea turtles reveals the importance of East China Sea for priority conservation. DIVERS DISTRIB 2022. [DOI: 10.1111/ddi.13531] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Affiliation(s)
- Junichi Okuyama
- Fisheries Technology Institute Japan Fisheries Research and Education Agency Ishigaki Okinawa Japan
| | - Akemi Watabe
- Ichinomiya Sea Turtle Association Ichinomiya Chiba Japan
| | | | - Kentaro Tanaka
- Atmosphere and Ocean Research Institute The University of Tokyo Chiba Japan
| | - Kotaro Shirai
- Atmosphere and Ocean Research Institute The University of Tokyo Chiba Japan
| | | | - Mamiko Arita
- Graduate School of Agriculture Kindai University Nara Japan
| | - Kento Fujita
- Graduate School of Informatics Kyoto University Yoshida Honmachi Kyoto Japan
| | - Hideaki Nishizawa
- Graduate School of Informatics Kyoto University Yoshida Honmachi Kyoto Japan
| | - Tomoko Narazaki
- Atmosphere and Ocean Research Institute The University of Tokyo Chiba Japan
- Faculty of Agriculture Meijo University Nagoya Aichi Japan
| | | | - Kazunari Kameda
- Kuroshima Research Institute Sea Turtle Association of Japan Taketomi Okinawa Japan
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Arantes LS, Vilaça ST, Mazzoni CJ, Santos FR. New Genetic Insights About Hybridization and Population Structure of Hawksbill and Loggerhead Turtles From Brazil. J Hered 2020; 111:444-456. [DOI: 10.1093/jhered/esaa024] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 07/23/2020] [Indexed: 12/11/2022] Open
Abstract
Abstract
An extremely high incidence of hybridization among sea turtles is found along the Brazilian coast. This atypical phenomenon and its impact on sea turtle conservation can be elucidated through research focused on the evolutionary history of sea turtles. We assessed high-quality multilocus haplotypes of 143 samples of the 5 species of sea turtles that occur along the Brazilian coast to investigate the hybridization process and the population structure of hawksbill (Eretmochelys imbricata) and loggerhead turtles (Caretta caretta). The multilocus data were initially used to characterize interspecific hybrids. Introgression (F2 hybrids) was only confirmed in hatchlings of F1 hybrid females (hawksbill × loggerhead), indicating that introgression was either previously overestimated and F2 hybrids may not survive to adulthood, or the first-generation hybrid females nesting in Brazil were born as recent as few decades ago. Phylogenetic analyses using nuclear markers recovered the mtDNA-based Indo-Pacific and Atlantic lineages for hawksbill turtles, demonstrating a deep genetic divergence dating from the early Pliocene. In addition, loggerhead turtles that share a common feeding area and belong to distinct Indo-Pacific and Atlantic mtDNA clades present no clear genetic differentiation at the nuclear level. Finally, our results indicate that hawksbill and loggerhead rookeries along the Brazilian coast are likely connected by male-mediated gene flow.
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Affiliation(s)
- Larissa S Arantes
- Departamento de Genética, Ecologia e Evolução, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais (UFMG), Avenida Antônio Carlos, Belo Horizonte - MG, Brazil
| | - Sibelle T Vilaça
- Berlin Center for Genomics in Biodiversity Research (BeGenDiv), Königin-Luise-Straße 6–8, Berlin, Germany (Vilaça and Mazzoni)
- Evolutionary Genetics Department, Leibniz Institute for Zoo and Wildlife Research (IZW), Alfred-Kowalke-Straße 17, Berlin, Germany
| | - Camila J Mazzoni
- Berlin Center for Genomics in Biodiversity Research (BeGenDiv), Königin-Luise-Straße 6–8, Berlin, Germany (Vilaça and Mazzoni)
- Evolutionary Genetics Department, Leibniz Institute for Zoo and Wildlife Research (IZW), Alfred-Kowalke-Straße 17, Berlin, Germany
| | - Fabrício R Santos
- Departamento de Genética, Ecologia e Evolução, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais (UFMG), Avenida Antônio Carlos, Belo Horizonte - MG, Brazil
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Rees ALF, Carreras C, Broderick AC, Margaritoulis D, Stringell TB, Godley BJ. Linking loggerhead locations: using multiple methods to determine the origin of sea turtles in feeding grounds. MARINE BIOLOGY 2017; 164:30. [PMID: 28133395 PMCID: PMC5236075 DOI: 10.1007/s00227-016-3055-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Accepted: 12/05/2016] [Indexed: 06/06/2023]
Abstract
Many marine megavertebrate taxa, including sea turtles, disperse widely from their hatching or birthing locations but display natal homing as adults. We used flipper tagging, satellite tracking and genetics to identify the origin of loggerhead turtles living in Amvrakikos Gulf, Greece. This location has been identified as hosting regionally important numbers of large-juvenile to adult sized turtles that display long-term residency and/or association to the area, and also presents a male biased sex ratio for adults. A total of 20 individuals were linked to nesting areas in Greece through flipper tagging and satellite telemetry, with the majority (16) associated with Zakynthos Island. One additional female was tracked from Amvrakikos Gulf to Turkey where she likely nested. Mitochondrial DNA mixed stock analyses of turtles captured in Amvrakikos Gulf (n = 95) indicated 82% of individuals originated from Greek nesting stocks, mainly from Zakynthos Island (63%), with lesser contributions from central Turkey, Cyprus and Libya. These results suggest that the male-biased sex ratio found in Amvrakikos Gulf may be driven by the fact that males breed twice as frequently on Zakynthos, resulting in their using foraging grounds of greater proximity to the breeding site. Conservation measures in localised foraging habitats for the protection of marine vertebrates, such as sea turtles, may have positive impacts on several disparate breeding stocks and the use of multiple methods to determine source populations can indicate the relative effectiveness of these measures.
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Affiliation(s)
- ALan F. Rees
- ARCHELON, the Sea Turtle Protection Society of Greece, Solomou 57, 104 32 Athens, Greece
- Marine Turtle Research Group, Centre for Ecology and Conservation, University of Exeter, Penryn Campus, Penryn, Cornwall TR10 9FE UK
| | - Carlos Carreras
- Marine Turtle Research Group, Centre for Ecology and Conservation, University of Exeter, Penryn Campus, Penryn, Cornwall TR10 9FE UK
- Department of Genetics, Microbiology and Statistics and IRBio, University of Barcelona, Av.Diagonal 643, 08028 Barcelona, Spain
| | - Annette C. Broderick
- Marine Turtle Research Group, Centre for Ecology and Conservation, University of Exeter, Penryn Campus, Penryn, Cornwall TR10 9FE UK
| | - Dimitris Margaritoulis
- ARCHELON, the Sea Turtle Protection Society of Greece, Solomou 57, 104 32 Athens, Greece
| | - Thomas B. Stringell
- Marine Turtle Research Group, Centre for Ecology and Conservation, University of Exeter, Penryn Campus, Penryn, Cornwall TR10 9FE UK
| | - Brendan J. Godley
- Marine Turtle Research Group, Centre for Ecology and Conservation, University of Exeter, Penryn Campus, Penryn, Cornwall TR10 9FE UK
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Turner Tomaszewicz CN, Seminoff JA, Peckham SH, Avens L, Kurle CM. Intrapopulation variability in the timing of ontogenetic habitat shifts in sea turtles revealed using δ 15 N values from bone growth rings. J Anim Ecol 2017; 86:694-704. [PMID: 28075017 DOI: 10.1111/1365-2656.12618] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2016] [Accepted: 11/24/2016] [Indexed: 11/29/2022]
Abstract
Determining location and timing of ontogenetic shifts in the habitat use of highly migratory species, along with possible intrapopulation variation in these shifts, is essential for understanding mechanisms driving alternate life histories and assessing overall population trends. Measuring variations in multi-year habitat-use patterns is especially difficult for remote oceanic species. To investigate the potential for differential habitat use among migratory marine vertebrates, we measured the naturally occurring stable nitrogen isotope (δ15 N) patterns that differentiate distinct ocean regions to create a 'regional isotope characterization', analysed the δ15 N values from annual bone growth layer rings from dead-stranded animals, and then combined the bone and regional isotope data to track individual animal movement patterns over multiple years. We used humeri from juvenile North Pacific loggerhead turtles (Caretta caretta), animals that undergo long migrations across the North Pacific Ocean (NPO), using multiple discrete regions as they develop to adulthood. Typical of many migratory marine species, ontogenetic changes in habitat use throughout their decades-long juvenile stage is poorly understood, but each potential habitat has unique foraging opportunities and spatially explicit natural and anthropogenic threats that could affect key life-history parameters. We found a bimodal size/age distribution in the timing that juveniles underwent an ontogenetic habitat shift from the oceanic central North Pacific (CNP) to the neritic east Pacific region near the Baja California Peninsula (BCP) (42·7 ± 7·2 vs. 68·3 ± 3·4 cm carapace length, 7·5 ± 2·7 vs. 15·6 ± 1·7 years). Important to the survival of this population, these disparate habitats differ considerably in their food availability, energy requirements and threats, and these differences can influence life-history parameters such as growth, survival and future fecundity. This is the first evidence of alternative ontogenetic shifts and habitat-use patterns for juveniles foraging in the eastern NPO. We combine two techniques, skeletochronology and stable isotope analysis, to reconstruct multi-year habitat-use patterns of a remote migratory species, linked to estimated ages and body sizes of individuals, to reveal variable ontogeny during the juvenile life stage that could drive alternate life histories and that has the potential to illuminate the migration patterns for other species with accretionary tissues.
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Affiliation(s)
- Calandra N Turner Tomaszewicz
- Division of Biological Sciences, Ecology, Behavior, and Evolution Section, University of California, La Jolla, CA, 92093, USA.,Southwest Fisheries Science Center, NOAA-National Marine Fisheries Service, La Jolla, CA, 92037, USA
| | - Jeffrey A Seminoff
- Southwest Fisheries Science Center, NOAA-National Marine Fisheries Service, La Jolla, CA, 92037, USA
| | - S Hoyt Peckham
- Center for Ocean Solutions, Stanford University, Pacific Grove, CA, 93950, USA
| | - Larisa Avens
- Southeast Fisheries Science Center, NOAA-National Marine Fisheries Service, Beaufort, NC, 28516, USA
| | - Carolyn M Kurle
- Division of Biological Sciences, Ecology, Behavior, and Evolution Section, University of California, La Jolla, CA, 92093, USA
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Rees AF, Alfaro-Shigueto J, Barata PCR, Bjorndal KA, Bolten AB, Bourjea J, Broderick AC, Campbell LM, Cardona L, Carreras C, Casale P, Ceriani SA, Dutton PH, Eguchi T, Formia A, Fuentes MMPB, Fuller WJ, Girondot M, Godfrey MH, Hamann M, Hart KM, Hays GC, Hochscheid S, Kaska Y, Jensen MP, Mangel JC, Mortimer JA, Naro-Maciel E, Ng CKY, Nichols WJ, Phillott AD, Reina RD, Revuelta O, Schofield G, Seminoff JA, Shanker K, Tomás J, van de Merwe JP, Van Houtan KS, Vander Zanden HB, Wallace BP, Wedemeyer-Strombel KR, Work TM, Godley BJ. Are we working towards global research priorities for management and conservation of sea turtles? ENDANGER SPECIES RES 2016. [DOI: 10.3354/esr00801] [Citation(s) in RCA: 175] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Briscoe DK, Parker DM, Bograd S, Hazen E, Scales K, Balazs GH, Kurita M, Saito T, Okamoto H, Rice M, Polovina JJ, Crowder LB. Multi-year tracking reveals extensive pelagic phase of juvenile loggerhead sea turtles in the North Pacific. MOVEMENT ECOLOGY 2016; 4:23. [PMID: 27729983 PMCID: PMC5048666 DOI: 10.1186/s40462-016-0087-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 09/13/2016] [Indexed: 05/04/2023]
Abstract
BACKGROUND The juvenile stage of loggerhead sea turtles (Caretta caretta) can last for decades. In the North Pacific Ocean, much is known about their seasonal movements in relation to pelagic habitat, yet understanding their multi-year, basin-scale movements has proven more difficult. Here, we categorize the large-scale movements of 231 turtles satellite tracked from 1997 to 2013 and explore the influence of biological and environmental drivers on basin-scale movement. RESULTS Results show high residency of juvenile loggerheads within the Central North Pacific and a moderate influence of the Earth's magnetic field, but no real-time environmental driver to explain migratory behavior. CONCLUSIONS We suggest the Central North Pacific acts as important developmental foraging grounds for young juvenile loggerhead sea turtles, rather than just a migratory corridor. We propose several hypotheses that may influence the connectivity between western and eastern juvenile loggerhead foraging grounds in the North Pacific Ocean.
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Affiliation(s)
- D. K. Briscoe
- Hopkins Marine Station, Stanford University, Pacific Grove, CA USA
| | - D. M. Parker
- Joint Institute for Marine and Atmospheric Research, National Oceanic and Atmospheric Administration, Newport, OR USA
| | - S. Bograd
- Environmental Research Division, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Southwest Fisheries Science Center, Monterey, CA USA
| | - E. Hazen
- Environmental Research Division, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Southwest Fisheries Science Center, Monterey, CA USA
| | - K. Scales
- Environmental Research Division, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Southwest Fisheries Science Center, Monterey, CA USA
| | - G. H. Balazs
- National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Pacific Islands Fisheries Science Center, Honolulu, HI USA
| | - M. Kurita
- Port of Nagoya Public Aquarium, Minato-ku, Nagoya, 455-0033 Japan
| | - T. Saito
- Usa Marine Biological Institute, Kochi University, Usa Tosa, Kochi, 781-1164 Japan
| | - H. Okamoto
- Port of Nagoya Public Aquarium, Minato-ku, Nagoya, 455-0033 Japan
| | - M. Rice
- Hawaii Preparatory Academy, 65-1692 Kohala Mt. Rd. Kamuela, Hawaii, 96743 USA
| | - J. J. Polovina
- National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Pacific Islands Fisheries Science Center, Honolulu, HI USA
| | - L. B. Crowder
- Hopkins Marine Station, Stanford University, Pacific Grove, CA USA
- Center for Ocean Solutions, Stanford University, Monterey, CA USA
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Fukuoka T, Narazaki T, Sato K. Summer-restricted migration of green turtles Chelonia mydas to a temperate habitat of the northwest Pacific Ocean. ENDANGER SPECIES RES 2015. [DOI: 10.3354/esr00671] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Nishizawa H, Narazaki T, Fukuoka T, Sato K, Hamabata T, Kinoshita M, Arai N. Juvenile green turtles on the northern edge of their range: mtDNA evidence of long-distance westward dispersals in the northern Pacific Ocean. ENDANGER SPECIES RES 2014. [DOI: 10.3354/esr00592] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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