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Phillips KF, Stahelin GD, Chabot RM, Mansfield KL. Long‐term trends in marine turtle size at maturity at an important Atlantic rookery. Ecosphere 2021. [DOI: 10.1002/ecs2.3631] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Affiliation(s)
- Katrina F. Phillips
- Department of Biology Marine Turtle Research Group University of Central Florida 4000 Central Florida Blvd., Bldg. 20BIO301 Orlando Florida32816USA
| | - Gustavo D. Stahelin
- Department of Biology Marine Turtle Research Group University of Central Florida 4000 Central Florida Blvd., Bldg. 20BIO301 Orlando Florida32816USA
| | - Ryan M. Chabot
- Department of Biology Marine Turtle Research Group University of Central Florida 4000 Central Florida Blvd., Bldg. 20BIO301 Orlando Florida32816USA
- Inwater Research Group 4160 NE Hyline Drive Jensen Beach Florida34957USA
| | - Katherine L. Mansfield
- Department of Biology Marine Turtle Research Group University of Central Florida 4000 Central Florida Blvd., Bldg. 20BIO301 Orlando Florida32816USA
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Chevallier D, Mourrain B, Girondot M. Modelling leatherback biphasic indeterminate growth using a modified Gompertz equation. Ecol Modell 2020. [DOI: 10.1016/j.ecolmodel.2020.109037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Harris LR, Nel R, Oosthuizen H, Meÿer M, Kotze D, Anders D, McCue S, Bachoo S. Managing conflicts between economic activities and threatened migratory marine species toward creating a multiobjective blue economy. CONSERVATION BIOLOGY : THE JOURNAL OF THE SOCIETY FOR CONSERVATION BIOLOGY 2018; 32:411-423. [PMID: 28766846 DOI: 10.1111/cobi.12992] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Revised: 06/09/2017] [Accepted: 07/17/2017] [Indexed: 06/07/2023]
Abstract
Harnessing the economic potential of the oceans is key to combating poverty, enhancing food security, and strengthening economies. But the concomitant risk of intensified resource extraction to migratory species is worrying given these species contribute to important ecological processes, often underpin alternative livelihoods, and are mostly already threatened. We thus sought to quantify the potential conflict between key economic activities (5 fisheries and hydrocarbon exploitation) and sea turtle migration corridors in a region with rapid economic development: southern and eastern Africa. We satellite tracked the movement of 20 loggerhead (Caretta caretta) and 14 leatherback (Dermochelys coriacea) turtles during their postnesting migrations. We used movement-based kernel density estimation to identify migration corridors for each species. We overlaid these corridors on maps of the distribution and intensity of economic activities, quantified the extent of overlap and threat posed by each activity on each species, and compared the effects of activities. These results were compared with annual bycatch rates in the respective fisheries. Both species' 3 corridors overlapped most with longline fishing, but the effect was worse for leatherbacks: their bycatch rates of approximately 1500/year were substantial relative to the regional population size of <100 nesting females/annum. This bycatch rate is likely slowing population growth. Artisanal fisheries may be of greater concern for loggerheads than for leatherbacks, but the population appears to be withstanding the high bycatch rates because it is increasing exponentially. The hydrocarbon industry currently has a moderately low impact on both species, but mining in key areas (e.g., Southern Mozambique) may undermine >50 years of conservation, potentially affecting >80% of loggerheads, 33% of the (critically endangered) leatherbacks, and their nesting beaches. We support establishing blue economies (i.e., generating wealth from the ocean), but oceans need to be carefully zoned and responsibly managed in both space and time to achieve economic (resource extraction), ecological (conservation, maintenance of processes), and social (maintenance of alternative livelihood opportunities, alleviate poverty) objectives.
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Affiliation(s)
- Linda R Harris
- Department of Zoology, Institute for Coastal and Marine Research, Nelson Mandela University, Port Elizabeth, Eastern Cape, 6001, South Africa
| | - Ronel Nel
- Department of Zoology, Institute for Coastal and Marine Research, Nelson Mandela University, Port Elizabeth, Eastern Cape, 6001, South Africa
| | - Herman Oosthuizen
- Department of Environmental Affairs, Branch: Oceans and Coasts, Cape Town, Western Cape, 8001, South Africa
| | - Mike Meÿer
- Department of Environmental Affairs, Branch: Oceans and Coasts, Cape Town, Western Cape, 8001, South Africa
| | - Deon Kotze
- Department of Environmental Affairs, Branch: Oceans and Coasts, Cape Town, Western Cape, 8001, South Africa
| | - Darrell Anders
- Department of Environmental Affairs, Branch: Oceans and Coasts, Cape Town, Western Cape, 8001, South Africa
| | - Steven McCue
- Department of Environmental Affairs, Branch: Oceans and Coasts, Cape Town, Western Cape, 8001, South Africa
| | - Santosh Bachoo
- Ezemvelo KwaZulu-Natal Wildlife, Private Bag X 3, Congella, Durban, KwaZulu-Natal, 4013, South Africa
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du Preez M, Nel R, Bouwman H. First report of metallic elements in loggerhead and leatherback turtle eggs from the Indian Ocean. CHEMOSPHERE 2018; 197:716-728. [PMID: 29407836 DOI: 10.1016/j.chemosphere.2018.01.106] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 01/20/2018] [Accepted: 01/22/2018] [Indexed: 06/07/2023]
Abstract
Bio-monitoring of pollutants in long-lived animals such as sea turtles is an important tool in ecotoxicology. We present the first report on metallic elements in sea turtle eggs from the Indian Ocean. Eggs of the leatherback and loggerhead turtle that breed on the Indian Ocean coast of South Africa were analysed for 30 elements. The eggshells and egg contents of the loggerhead turtle, the smaller of the two species, had higher or significantly higher concentrations than leatherbacks, except for strontium - the reason is unknown. Elemental concentrations in eggshells and contents were the same or lower compared with other studies. The differences in concentrations in the egg contents and eggshells between the two species are likely due to different trophic levels, migration patterns, life histories, age, and growth, as well as differences in pollution sources and the uptake, retention and elimination characteristics of the different elements by the different species. We found no congruence between patterns in eggshells and corresponding egg contents, for both species. However, eggshells and egg contents showed congruence between species. The lack of congruence between eggshells and contents within each species precludes using eggshell concentrations as a proxy for egg content concentrations. Copper, strontium, and selenium occurred at concentrations higher than available toxic reverence values. Further research is warranted, including the analyses of POPs, as well as possible deme discrimination based on compositional pattern differences. Turtles serve as 'active samplers' returning to the same location to breed-something that is not practical with marine mammals or elasmobranchs.
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Affiliation(s)
- M du Preez
- Research Unit: Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
| | - R Nel
- Department of Zoology and Institute for Coastal and Marine Research, Nelson Mandela University, Port Elizabeth, South Africa
| | - H Bouwman
- Research Unit: Environmental Sciences and Management, North-West University, Potchefstroom, South Africa.
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Monsinjon J, Jribi I, Hamza A, Ouerghi A, Kaska Y, Girondot M. Embryonic Growth Rate Thermal Reaction Norm of Mediterranean Caretta caretta Embryos from Two Different Thermal Habitats, Turkey and Libya. CHELONIAN CONSERVATION AND BIOLOGY 2017. [DOI: 10.2744/ccb-1269.1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jonathan Monsinjon
- Laboratoire Écologie, Systématique, Évolution, Université Paris-Sud, AgroParisTech, CNRS, Université Paris Saclay, 91405 Orsay, France []
- Co-first authors
| | - Imed Jribi
- Faculté des Sciences de Sfax, Université de Sfax, B.P. 1171, Sfax 3000, Tunisie
- Co-first authors
| | - Abdulmaula Hamza
- Libyan Sea Turtle Program, Environment General Authority, Alfateh University, PO Box 13793, Tripoli, Libya
| | - Atef Ouerghi
- Regional Activity Centre for Specially Protected Areas, Yasser Arafat Boulevard, PO Box 337, 1080, Tunis Cedex, Tunisia
| | - Yakup Kaska
- Pamukkale Üniversitesi, Fen Edebiyat Fakültesi, Biyoloji Bölümü, Denizli, Turkey
| | - Marc Girondot
- Laboratoire Écologie, Systématique, Évolution, Université Paris-Sud, AgroParisTech, CNRS, Université Paris Saclay, 91405 Orsay, France []
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Omeyer LCM, Godley BJ, Broderick AC. Growth rates of adult sea turtles. ENDANGER SPECIES RES 2017. [DOI: 10.3354/esr00862] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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7
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Adel M, Cortés-Gómez AA, Dadar M, Riyahi H, Girondot M. A comparative study of inorganic elements in the blood of male and female Caspian pond turtles (Mauremys caspica) from the southern basin of the Caspian Sea. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:24965-24979. [PMID: 28918536 DOI: 10.1007/s11356-017-0067-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 09/01/2017] [Indexed: 06/07/2023]
Abstract
Due to their bioaccumulation and biomagnification pathways, inorganic elements can accumulate in high-level aquatic organisms in the food web. Then, this species can be used to monitor the quality of the environment. Blood concentration of nine inorganic elements, including possible toxic metals (An, Cu, Mn, Se, As, Ni, Cd, Pb, and Hg), in 20 males and 20 females from eight different locations with high industry and agriculture activities in Iran were evaluated in this work. Additionally, size, sex, condition index, and locations were also included and analyzed. Among the essential elements, Zn and Se presented very high concentrations (56.14 ± 2.66 and 8.44 ± 0.77 μg/g ww, respectively) in all locations. Regarding possible toxic elements, Pb and Cd presented concerning concentrations as well (0.52 and 0.58 μg/g ww); this is especially true for Pb, an element found in very high concentrations in tissues of turtles from the same area in a previous study. The sex and the size of the individuals also had significant differences in concentration of Pb, Cd, As, and Hg.
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Affiliation(s)
- Milad Adel
- Department of Aquatic Animal Health and Diseases, Iranian Fisheries Science Research Institute, Agriculture Research Education and Extension Organization, Tehran, Iran.
| | - Adriana A Cortés-Gómez
- Laboratoire Ecologie, Systématique et Evolution, UMR 8079, Université Paris Sud, CNRS et AgroParisTech, 91405, Orsay cedex, France
| | - Maryam Dadar
- Razi Vaccine and Serum Research Institute, Agricultural Research, Karaj, Iran
| | - Hossein Riyahi
- DVM Graduated, Faculty of Veterinary Medicine, Shahrekord University, Shahrekord, Iran
| | - Marc Girondot
- Laboratoire Ecologie, Systématique et Evolution, UMR 8079, Université Paris Sud, CNRS et AgroParisTech, 91405, Orsay cedex, France
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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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