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Lubitz N, Daly R, Filmalter JD, Sheaves M, Cowley PD, Naesje TF, Barnett A. Context drives movement patterns in a mobile marine predator. MOVEMENT ECOLOGY 2023; 11:28. [PMID: 37226200 DOI: 10.1186/s40462-023-00390-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 05/06/2023] [Indexed: 05/26/2023]
Abstract
Intra-specific variability in movement behaviour occurs in all major taxonomic groups. Despite its common occurrence and ecological consequences, individual variability is often overlooked. As a result, there is a persistent gap in knowledge about drivers of intra-specific variability in movement and its role in fulfilling life history requirements. We apply a context-focused approach to bull sharks (Carcharhinus leucas), a highly mobile marine predator, incorporating intra-specific variability to understand how variable movement patterns arise and how they might be altered under future change scenarios. Spatial analysis of sharks, acoustically tagged both at their distributional limit and the centre of distribution in southern Africa, was combined with spatial analysis of acoustically tagged teleost prey and remote-sensing of environmental variables. The objective was to test the hypothesis that varying resource availability and magnitude of seasonal environmental change in different locations interact to produce variable yet predictable movement behaviours across a species' distribution. Sharks from both locations showed high seasonal overlap with predictable prey aggregations. Patterns were variable in the centre of distribution, where residency, small- and large-scale movements were all recorded. In contrast, all animals from the distributional limit performed 'leap-frog migrations', making long-distance migrations bypassing conspecifics in the centre of distribution. By combining multiple variables related to life history requirements for animals in different environments we identified combinations of key drivers that explain the occurrence of differing movement behaviours across different contexts and delineated the effects of environmental factors and prey dynamics on predator movement. Comparisons with other taxa show striking similarities in patterns of intra-specific variability across terrestrial and marine species, suggesting common drivers.
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Affiliation(s)
- Nicolas Lubitz
- Marine Data Technology Hub, College of Science and Engineering, James Cook University, Townsville City, QLD, Australia.
- Biopixel Oceans Foundation, Cairns, QLD, Australia.
| | - Ryan Daly
- Oceanographic Research Institute, Marine Parade, PO Box 10712, 4056, Durban, South Africa
- South African Institute for Aquatic Biodiversity (SAIAB), Private Bag, 1015, 6140, Makhanda, South Africa
| | - John D Filmalter
- South African Institute for Aquatic Biodiversity (SAIAB), Private Bag, 1015, 6140, Makhanda, South Africa
| | - Marcus Sheaves
- Marine Data Technology Hub, College of Science and Engineering, James Cook University, Townsville City, QLD, Australia
| | - Paul D Cowley
- South African Institute for Aquatic Biodiversity (SAIAB), Private Bag, 1015, 6140, Makhanda, South Africa
| | - Tor F Naesje
- Norwegian Institute for Nature Research, P.O. Box 5685, NO- 7485, Torgarden, Trondheim, Norway
| | - Adam Barnett
- Marine Data Technology Hub, College of Science and Engineering, James Cook University, Townsville City, QLD, Australia
- Biopixel Oceans Foundation, Cairns, QLD, Australia
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2
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Exploring the demography and conservation needs of hawksbill sea turtles Eretmochelys imbricata in north-west Mexico. ORYX 2022. [DOI: 10.1017/s0030605322000709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Abstract
The hawksbill sea turtle Eretmochelys imbricata is categorized as Critically Endangered on the IUCN Red List and its population has declined by over 80% in the last century. The Eastern Pacific population is one of the most threatened hawksbill populations globally. Western Mexico is the northern distribution limit for hawksbill sea turtles in the Eastern Pacific and recent research indicates that the Mexican Pacific portion of the population is a separate management unit because of the restricted movements of these turtles. Here we use the most complete database of sighting records in the north-west Pacific of Mexico to identify sites where hawksbill turtles are present. We also develop a conservation index to determine the conservation status of hawksbill turtle sites. Our results demonstrate the importance of this region for juveniles and the relevance of rocky reefs and mangrove estuaries as habitats for hawksbill turtles. We identified 52 sites with records of hawksbill turtles. Most of these sites (71%) are not protected; however, sites with high conservation value included islands and coastal sites along the Baja California peninsula that are established as marine protected areas. Reefs and mangrove estuaries relevant for hawksbill turtles are probably also significant fish nursery areas that are important for local fishing communities, creating opportunities for conservation strategies that combine science, local engagement and policy to benefit both local fishing communities and hawksbill sea turtle conservation.
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Kim IH, Park IK, Han DJ, Kim MS, Park D, Moon DY, Cho IY, Im JE, Park J, An YR. Movement Patterns of Juvenile Loggerhead Turtles ( Caretta caretta L. 1758) and Green Turtles ( Chelonia mydas L. 1758) Hatched in Captivity and Released in the Korean Waters. Animals (Basel) 2022; 12:ani12162157. [PMID: 36009748 PMCID: PMC9405475 DOI: 10.3390/ani12162157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 08/16/2022] [Accepted: 08/17/2022] [Indexed: 11/16/2022] Open
Abstract
With most sea turtle populations declining, activities to conserve their habitat and nesting grounds and restore their populations are being implemented worldwide. To preserve the Northwestern Pacific populations, the National Marine Biodiversity Institute of Korea has been releasing artificially propagated sea turtles, but whether these individuals join the wild population remains unknown. The present study aimed to determine the movement patterns of artificially propagated juvenile loggerhead (Caretta caretta) and green (Chelonia mydas) turtles fitted with satellite transmitters on their carapaces and released in the waters of Jeju or Yeosu, Republic of Korea, between August 2018 and April 2022. Loggerheads traveled northward to the East Sea, whereas green turtles moved west or southwest. Two 36-month-old and two 48-month-old loggerheads moved toward their potential nursery grounds and toward their feeding grounds, respectively. Three green turtles with a curved carapace length (CCL) of <40 cm moved toward their nursery or feeding grounds, while three individuals (CCL > 45 cm) moved toward their inshore foraging areas. The travel paths were closely related to the direction of local sea currents. Our results implied that releasing artificially propagated sea turtles, considering their age and CCL, can positively contribute to the conservation of Northwestern Pacific populations.
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Affiliation(s)
- Il-Hun Kim
- Department of Ecology and Conservation, National Marine Biodiversity Institute of Korea, Seocheon 33662, Korea
| | - Il-Kook Park
- Division of Science Education, Kangwon National University, Chuncheon 24341, Korea
| | - Dong-Jin Han
- Aqua Team, Aqua Planet Yeosu, Yeosu 59744, Korea
| | - Min-Seop Kim
- National Marine Bio-Resources and Information Center, National Marine Biodiversity Institute of Korea, Seocheon 33662, Korea
| | - Daesik Park
- Division of Science Education, Kangwon National University, Chuncheon 24341, Korea
| | | | - In-Young Cho
- Department of Ecology and Conservation, National Marine Biodiversity Institute of Korea, Seocheon 33662, Korea
| | - Ji-En Im
- Aqua Team, Aqua Planet Yeosu, Yeosu 59744, Korea
| | - Jaejin Park
- Division of Science Education, Kangwon National University, Chuncheon 24341, Korea
| | - Yong-Rock An
- National Marine Bio-Resources and Information Center, National Marine Biodiversity Institute of Korea, Seocheon 33662, Korea
- Correspondence: ; Tel.: +82-41-950-0750
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4
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Kinoshita C, Saito A, Kawai M, Sato K, Sakamoto KQ. A Non-Invasive Heart Rate Measurement Method Is Improved by Placing the Electrodes on the Ventral Side Rather Than the Dorsal in Loggerhead Turtles. Front Physiol 2022; 13:811947. [PMID: 35250617 PMCID: PMC8889138 DOI: 10.3389/fphys.2022.811947] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 01/12/2022] [Indexed: 11/29/2022] Open
Abstract
Heart rate measurement is an essential method for evaluating the physiological status of air-breathing diving animals. However, owing to technical difficulties, many marine animals require an invasive approach to record an electrocardiogram (ECG) in water, limiting the application of this approach in a wide range of marine animals. Recently, a non-invasive system was reported to measure the ECG of hard-shelled sea turtles by pasting the electrodes on the dorsal side of the shell, although the ECG obtained from the moving turtle contains noise produced by muscle contraction. Here, we report that clear ECGs can be obtained by placing the electrodes on the ventral side rather than the dorsal side in loggerhead sea turtles. Using our method, clearer ECG signals were obtained with less electrical noise, even when turtles are swimming. According to the anatomical features, the electrode position on the ventral side is closer to the heart than the dorsal side, minimizing the effects of noise generated by the skeletal muscle. This new biologging technique will elucidate the functioning of the circulatory system of sea turtles during swimming and their adaptabilities to marine environments. This article is part of the theme issue “Methods and Applications in Physio-logging.”
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Affiliation(s)
- Chihiro Kinoshita
- International Coastal Research Center, Atmosphere and Ocean Research Institute, The University of Tokyo, Otsuchi, Japan
- *Correspondence: Chihiro Kinoshita,
| | - Ayaka Saito
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan
| | - Megumi Kawai
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan
| | - Katsufumi Sato
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan
| | - Kentaro Q. Sakamoto
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan
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5
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Martínez-Estévez L, Steller DL, Zilliacus KM, Cuevas Amador JP, Amador FC, Szuta D, Miller SD, Dayton GH, Tershy BR, Croll DA. Foraging ecology of critically endangered Eastern Pacific hawksbill sea turtles (Eretmochelys imbricata) in the Gulf of California, Mexico. MARINE ENVIRONMENTAL RESEARCH 2022; 174:105532. [PMID: 35032818 DOI: 10.1016/j.marenvres.2021.105532] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 11/14/2021] [Accepted: 11/21/2021] [Indexed: 06/14/2023]
Abstract
The Eastern Pacific hawksbill sea turtle population is one of the most endangered of all sea turtle species. Here, we examine the foraging ecology of 47 hawksbill turtles (40.5-90.3 cm CCL, mean = 54.1 ± 10.1 cm) around Isla San José, Gulf of California, Mexico by integrating information from passive acoustic telemetry, behavior recordings, fecal analysis, and habitat surveys. Tagged hawkbill turtles exhibited high site fidelity over months and years (tracking duration 1-1490 days, mean = 255 ± 373 days) to the location and benthic habitat where individuals were initially caught. Diet was dominated by benthic invertebrates and algae including sponges, algae, tunicates, and mangrove roots. The mean percent cover of these benthic food items was significantly greater in the mangrove estuary than in adjacent rocky and sandy reef habitats. The Isla San José foraging ground is a high-use area for hawksbills and should be granted national protection status.
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Affiliation(s)
- Lourdes Martínez-Estévez
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA, 95050, USA.
| | - Diana L Steller
- Moss Landing Marine Laboratories, Moss Landing, CA, 95039, USA
| | - Kelly M Zilliacus
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA, 95050, USA
| | | | | | - Dorota Szuta
- Moss Landing Marine Laboratories, Moss Landing, CA, 95039, USA
| | - Scott D Miller
- Department of Biological Sciences, Florida State University, Tallahassee, FL, 32306, USA
| | - Gage H Dayton
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA, 95050, USA
| | - Bernie R Tershy
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA, 95050, USA
| | - Donald A Croll
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA, 95050, USA
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6
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Fukuoka T, Sakane F, Kinoshita C, Sato K, Mizukawa K, Takada H. Covid-19-derived plastic debris contaminating marine ecosystem: Alert from a sea turtle. MARINE POLLUTION BULLETIN 2022; 175:113389. [PMID: 35149314 PMCID: PMC8806019 DOI: 10.1016/j.marpolbul.2022.113389] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Accepted: 01/20/2022] [Indexed: 05/06/2023]
Abstract
On 10 August 2021, a face mask (14 cm × 9 cm) was found in the feces of a juvenile green turtle, by-caught alive in a set net off the northeast coast of Japan. Although sea turtles have been monitored in this region over the last 15 years (n = 76), face masks had never been found before the Covid-19 pandemic and this is the first detection. Fourier-transform infrared spectroscopy identified the mask as polypropylene. Estrogenic active benzotriazole-type UV stabilizers such as UV329 were detected in commercially available polypropylene face masks. Exposure of marine organisms ingesting plastics to endocrine-disrupting chemicals and physical injury are of concern. This study indicates that changes in human life in the pandemic are beginning to affect marine life. Precautionary actions including establishment of appropriate waste management of personal protective equipment and use of safe additives are urgently needed.
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Affiliation(s)
- Takuya Fukuoka
- Laboratory of Organic Geochemistry (LOG), Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.
| | - Fumiki Sakane
- Laboratory of Organic Geochemistry (LOG), Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan
| | - Chihiro Kinoshita
- International Coastal Research Center, Atmosphere and Ocean Research Institute, The University of Tokyo, Otsuchi, Iwate 028-1102, Japan
| | - Katsufumi Sato
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba 277-8564, Japan
| | - Kaoruko Mizukawa
- Laboratory of Organic Geochemistry (LOG), Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan
| | - Hideshige Takada
- Laboratory of Organic Geochemistry (LOG), Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan
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Sakamoto KQ, Miyayama M, Kinoshita C, Fukuoka T, Ishihara T, Sato K. A non-invasive system to measure heart rate in hard-shelled sea turtles: potential for field applications. Philos Trans R Soc Lond B Biol Sci 2021; 376:20200222. [PMID: 34121465 PMCID: PMC8200654 DOI: 10.1098/rstb.2020.0222] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/20/2020] [Indexed: 01/05/2023] Open
Abstract
To measure the heart rate of unrestrained sea turtles, it has been believed that a probe must be inserted inside the body owing to the presence of the shell. However, inserting the probe is invasive and difficult to apply to animals in the field. Here, we have developed a non-invasive heart rate measurement method for some species of sea turtles. In our approach, an electrocardiogram (ECG) was performed using an animal-borne ECG recorder and two electrodes-which were electrically insulated from seawater-pasted on the carapace. Based on the measured ECG, the heartbeat signals were identified with an algorithm using a band-pass filter. We implemented this algorithm in a user-friendly program package, ECGtoHR. In experiments conducted in a water tank and in a lagoon, we successfully measured the heart rate of loggerhead, olive ridley and black turtles, but not green and hawksbill turtles. The average heart rate of turtles when resting underwater was 6.2 ± 1.9 beats min-1 and that when moving at the surface was 14.0 ± 2.4 beats min-1. Our approach is particularly suitable for endangered species such as sea turtles, and has the potential to be extended to a variety of other free-ranging species. This article is part of the theme issue 'Measuring physiology in free-living animals (Part I)'.
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Affiliation(s)
- Kentaro Q. Sakamoto
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan
| | - Masaru Miyayama
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan
| | - Chihiro Kinoshita
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan
| | - Takuya Fukuoka
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan
| | - Takashi Ishihara
- Sea Turtle Association of Japan, 5-17-18-302 Nagaomotomachi, Hirakata, Osaka 573-0163, Japan
| | - Katsufumi Sato
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan
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Lima EHSM, Awabdi DR, Melo MTD, Giffoni B, Bugoni L. Nonlethal capture of green sea turtles (Chelonia mydas) in fishing weirs as an opportunity for population studies and conservation. MARINE ENVIRONMENTAL RESEARCH 2021; 170:105437. [PMID: 34364056 DOI: 10.1016/j.marenvres.2021.105437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Revised: 07/19/2021] [Accepted: 07/23/2021] [Indexed: 06/13/2023]
Abstract
Green sea turtles (Chelonia mydas) switch habitats during their development, moving from pelagic to neritic areas and then commuting between nesting and foraging grounds during adulthood. Due to their predominantly coastal habitats, they are under a range of anthropogenic threats. We monitored turtles incidentally captured in fishing weirs in Ceará state, northeastern Brazil, over a decade and provided an overview of capture rates in the fishery during previous decades. Between 2008 and 2018, 2335 captures were recorded, 76% were only once. Most recaptures (86%) occurred up to six months after the first capture, with a mean growth rate of 6.7 ± 3.6 cm year-1. Capture rates varied between years, with the highest rates during the historical period, peaking in 1962 (0.16 turtles day weir-1). Between 2008 and 2018, the daily capture rate was 0.07 turtles day weir-1. Similar to other areas, the use of turtles as a fishery resource seems to have reduced population sizes in the Atlantic Ocean. On the other hand, the intensive monitoring of local weirs provided an opportunity to mobilize the community regarding their conservation, which in turn could have supported the recovery of turtles from a number of distant colonies. The relatively constant and year-round capture of green sea turtles reflects the presence of individuals from different rookeries and demonstrates the importance of the region as a developmental ground for juveniles from different nesting areas, with high growth rates compared with other feeding areas. Partnership with local fishermen and the long-term monitoring of passive nonlethal fishing weirs are key tools in supporting sea turtle conservation.
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Affiliation(s)
| | - Danielle Rodrigues Awabdi
- Laboratório de Aves Aquáticas e Tartarugas Marinhas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande (FURG), Campus Carreiros, Av. Itália s/n, 96203-900, Rio Grande, RS, Brazil.
| | | | - Bruno Giffoni
- Fundação Projeto Tamar, PO Box 3348, 59082-971, Natal, RN, Brazil.
| | - Leandro Bugoni
- Laboratório de Aves Aquáticas e Tartarugas Marinhas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande (FURG), Campus Carreiros, Av. Itália s/n, 96203-900, Rio Grande, RS, Brazil.
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Kudo H, Nishizawa H, Uchida K, Sato K. Boldness–exploration behavioral syndrome in wild sub-adult green sea turtles caught at Oita, Japan. Appl Anim Behav Sci 2021. [DOI: 10.1016/j.applanim.2021.105216] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Kinoshita C, Fukuoka T, Narazaki T, Niizuma Y, Sato K. Analysis of why sea turtles swim slowly: a metabolic and mechanical approach. J Exp Biol 2021; 224:jeb.236216. [PMID: 33436369 DOI: 10.1242/jeb.236216] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 01/04/2021] [Indexed: 11/20/2022]
Abstract
Animals with high resting metabolic rates and low drag coefficients typically have fast optimal swim speeds in order to minimise energy costs per unit travel distance. The cruising swim speeds of sea turtles (0.5-0.6 m s-1) are slower than those of seabirds and marine mammals (1-2 m s-1). This study measured the resting metabolic rates and drag coefficients of sea turtles to answer two questions: (1) do turtles swim at the optimal swim speed?; and (2) what factors control the optimal swim speed of turtles? The resting metabolic rates of 13 loggerhead and 12 green turtles were measured; then, the cruising swim speeds of 15 loggerhead and 9 green turtles were measured and their drag coefficients were estimated under natural conditions. The measured cruising swim speeds (0.27-0.50 m s-1) agreed with predicted optimal swim speeds (0.19-0.32 m s-1). The resting metabolic rates of turtles were approximately one-twentieth those of penguins, and the products of the drag coefficient and frontal area of turtles were 8.6 times higher than those of penguins. Therefore, our results suggest that both low resting metabolic rate and high drag coefficient of turtles determine their slow cruising speed.
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Affiliation(s)
- Chihiro Kinoshita
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan
| | - Takuya Fukuoka
- International Coastal Research Center, The University of Tokyo, 1-19-8 Akahama, Otsuchi, Iwate 028-1102, Japan
| | - Tomoko Narazaki
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan
| | - Yasuaki Niizuma
- Faculty of Agriculture, Meijo University, 1-501 Shiogamaguchi, Tenpaku-ku, Nagoya, Aichi 468-8502, Japan
| | - Katsufumi Sato
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan
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Naro-Maciel E, Arengo F, Galante P, Vintinner E, Holmes KE, Balazs G, Sterling EJ. Marine protected areas and migratory species: residency of green turtles at Palmyra Atoll, Central Pacific. ENDANGER SPECIES RES 2018. [DOI: 10.3354/esr00922] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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12
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Rivera SF, Vasselon V, Ballorain K, Carpentier A, Wetzel CE, Ector L, Bouchez A, Rimet F. DNA metabarcoding and microscopic analyses of sea turtles biofilms: Complementary to understand turtle behavior. PLoS One 2018; 13:e0195770. [PMID: 29659610 PMCID: PMC5901997 DOI: 10.1371/journal.pone.0195770] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Accepted: 03/29/2018] [Indexed: 01/26/2023] Open
Abstract
Sea turtles are distributed in tropical and subtropical seas worldwide. They play several ecological roles and are considered important indicators of the health of marine ecosystems. Studying epibiotic diatoms living on turtle shells suggestively has great potential in the study of turtle behavior because diatoms are always there. However, diatom identification at the species level is time consuming, requires well-trained specialists, and there is a high probability of finding new taxa growing on turtle shells, which makes identification tricky. An alternative approach based on DNA barcoding and high throughput sequencing (HTS), metabarcoding, has been developed in recent years to identify species at the community level by using a DNA reference library. The suitabilities of morphological and molecular approaches were compared. Diatom assemblages were sampled from seven juvenile green turtles (Chelonia mydas) from Mayotte Island, France. The structures of the epibiotic diatom assemblages differed between both approaches. This resulted in different clustering of the turtles based on their diatom communities. Metabarcoding allowed better discrimination between turtles based on their epibiotic diatom assemblages and put into evidence the presence of a cryptic diatom diversity. Microscopy, for its part, provided more ecological information of sea turtles based on historical bibliographical data and the abundances of ecological guilds of the diatom species present in the samples. This study shows the complementary nature of these two methods for studying turtle behavior.
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Affiliation(s)
- Sinziana F. Rivera
- UMR CARRTEL, INRA, Université Savoie Mont-Blanc, Thonon, France
- * E-mail:
| | | | - Katia Ballorain
- Agence Française pour la Biodiversité, Parc naturel marin de Mayotte, 14 lot. Darine Montjoly, Iloni, Mayotte, France
- Association Escale, 13 bis rue Foundi Madi Attoumani, Mronabeja, Mayotte, France
| | - Alice Carpentier
- Association Escale, 13 bis rue Foundi Madi Attoumani, Mronabeja, Mayotte, France
| | | | - Luc Ector
- LIST, 41 rue du Brill, Belvaux, Grand-duchy of Luxembourg
| | - Agnès Bouchez
- UMR CARRTEL, INRA, Université Savoie Mont-Blanc, Thonon, France
| | - Frédéric Rimet
- UMR CARRTEL, INRA, Université Savoie Mont-Blanc, Thonon, France
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13
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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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14
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Chevis MG, Godley BJ, Lewis JP, Jackson Lewis J, Scales KL, Graham RT. Movement patterns of juvenile hawksbill turtles Eretmochelys imbricata at a Caribbean coral atoll: long-term tracking using passive acoustic telemetry. ENDANGER SPECIES RES 2017. [DOI: 10.3354/esr00812] [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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15
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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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Fukuoka T, Yamane M, Kinoshita C, Narazaki T, Marshall GJ, Abernathy KJ, Miyazaki N, Sato K. The feeding habit of sea turtles influences their reaction to artificial marine debris. Sci Rep 2016; 6:28015. [PMID: 27305858 PMCID: PMC4910051 DOI: 10.1038/srep28015] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Accepted: 05/27/2016] [Indexed: 12/05/2022] Open
Abstract
Ingestion of artificial debris is considered as a significant stress for wildlife including sea turtles. To investigate how turtles react to artificial debris under natural conditions, we deployed animal-borne video cameras on loggerhead and green turtles in addition to feces and gut contents analyses from 2007 to 2015. Frequency of occurrences of artificial debris in feces and gut contents collected from loggerhead turtles were 35.7% (10/28) and 84.6% (11/13), respectively. Artificial debris appeared in all green turtles in feces (25/25) and gut contents (10/10), and green turtles ingested more debris (feces; 15.8 ± 33.4 g, gut; 39.8 ± 51.2 g) than loggerhead turtles (feces; 1.6 ± 3.7 g, gut; 9.7 ± 15.0 g). In the video records (60 and 52.5 hours from 10 loggerhead and 6 green turtles, respectively), turtles encountered 46 artificial debris and ingested 23 of them. The encounter-ingestion ratio of artificial debris in green turtles (61.8%) was significantly higher than that in loggerhead turtles (16.7%). Loggerhead turtles frequently fed on gelatinous prey (78/84), however, green turtles mainly fed marine algae (156/210), and partly consumed gelatinous prey (10/210). Turtles seemed to confuse solo drifting debris with their diet, and omnivorous green turtles were more attracted by artificial debris.
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Affiliation(s)
- Takuya Fukuoka
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba, 277-8564, Japan
| | - Misaki Yamane
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba, 277-8564, Japan
| | - Chihiro Kinoshita
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba, 277-8564, Japan
| | - Tomoko Narazaki
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba, 277-8564, Japan
| | - Greg J Marshall
- National Geographic Remote Imaging, 1145 17th Street NW Washington, D.C., 20036, United States of America
| | - Kyler J Abernathy
- National Geographic Remote Imaging, 1145 17th Street NW Washington, D.C., 20036, United States of America
| | - Nobuyuki Miyazaki
- Japan Marine Science Foundation, 1-1-1 Ikenohata, Taito-ku, Tokyo, 110-0008, Japan
| | - Katsufumi Sato
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba, 277-8564, Japan
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