Size-related differences in feeding habitat use of adult female loggerhead turtles Caretta caretta around Japan determined by stable isotope analyses and satellite telemetry

Hatase, Hideo; Takai, Noriyuki; Matsuzawa, Yoshimasa; Sakamoto, Wataru; Omuta, Kazuyoshi; Goto, Kiyoshi; Arai, Nobuaki; Fujiwara, Tateki

doi:10.3354/meps233273

Cited by 247 publications

(297 citation statements)

References 23 publications

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“…Mediterranean adult loggerheads do, however, exhibit some variety in their movements, with some turtles foraging in offshore oceanic waters for at least part of their inter-reproductive phase, sometimes keeping on the move without fixing to any specific site (Zbinden et al 2008;Luschi et al 2013;Schofield et al 2013). This pattern too is in general accordance with recent findings obtained elsewhere showing how loggerhead spatial behaviour is actually characterised by a considerable complexity (Hatase et al 2002;Hawkes et al 2006Hawkes et al , 2007Rees et al 2010). This variability is likely linked to the loggerhead's plastic and opportunistic foraging habits (McClellan et al 2010;Reich et al 2010;Narazaki et al 2013), which allow them to exploit both neritic and oceanic foraging grounds.…”

Section: General Considerationssupporting

confidence: 80%

“…Papi et al 1997;Limpus & Limpus 2001), where females stay for long periods feeding on benthic prey and to which they show fidelity in successive reproductive seasons ). The most recent results have, however, revealed numerous exceptions to this general pattern, including the possible prolonged residence of females in the oceanic habitat (Hatase et al 2002;Hawkes et al 2006;Hatase et al 2007;Rees et al 2010), suggesting the possibility of epipelagic feeding in adults (Reich et al 2010), the presence of seasonal migrations between different feeding and wintering areas (Hawkes et al 2007;Zbinden et al 2008Zbinden et al , 2011 or convoluted segments in the migratory routes (Dodd & Byles 2003;Hatase et al 2007;Hawkes et al 2007) of uncertain biological significance.…”

Section: Introductionmentioning

confidence: 99%

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Movement patterns of marine turtles in the Mediterranean Sea: a review

Luschi

Casale

2014

Italian Journal of Zoology

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Understanding the at-sea spatial behaviour of sea turtles is a priority for their conservation. In the present paper, the current information on the distribution and movement patterns of the two species breeding in the Mediterranean, the loggerhead and the green turtle, is reviewed, focusing mainly on the 195 published routes of satellite-tracked turtles. A satisfactory level of knowledge about adults' migrations and other movements is reached only for loggerheads breeding at Zakynthos Island, Greece, and for green and loggerhead females nesting in Cyprus, while studies at foraging grounds are limited to loggerheads in the western and central parts of the basin. Adult males and females mostly show quite uniform post-breeding migratory patterns, typically moving towards individually specific neritic foraging grounds. A much higher variability is shown by loggerhead juveniles, which is probably associated with differences in their spatial behaviour while in oceanic or neritic waters. Evidence of seasonal migrations driven by lower temperatures in winter is available only for adult and juvenile loggerheads frequenting the two northernmost parts of the basin, i.e. the Ligurian and the northern Adriatic Sea. Current knowledge gaps and priorities for further research in the Mediterranean are discussed.

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Section: General Considerationssupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Movement patterns of marine turtles in the Mediterranean Sea: a review

Luschi

Casale

2014

Italian Journal of Zoology

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“…Initial efforts have been undertaken to understand how differential foraging locations and oceanographic conditions affect demographic parameters such as clutch size, number of clutches per nesting season, clutch sex ratio, and female body size in loggerhead populations (Hatase et al 2002, Hawkes et al 2007a, b, Zbinden et al 2011, Bailey et al 2012.…”

Section: Introductionmentioning

confidence: 99%

Assignment of nesting loggerhead turtles to their foraging areas in the Northwest Atlantic using stable isotopes

et al. 2012

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Abstract. Differential foraging area use can affect population demographics of highly migratory fauna because of differential environmental changes and anthropogenic threats among those areas. Thus, identification of foraging areas is vital for the development of effective management strategies for endangered migratory species. In this study, we assigned 375 loggerhead turtles (Caretta caretta) nesting at six locations along the east coast of the United States to their foraging areas in the Northwest Atlantic (NWA) using carbon and nitrogen stable isotope values (d 15N values characterized three geographic areas-with distinct abiotic and biotic features-used by adult loggerheads in the NWA. Discriminant analysis assigned all 375 female loggerheads to one of the three foraging areas; 91% were assigned with probabilities of !80%. The proportion of nesting turtles using each foraging ground varied geographically; most turtles nesting in northern beaches (72-80%) tend to forage at higher latitudes while most turtles nesting in southern beaches (46-81%) tend to forage at lower latitudes. Stable isotopes can reveal the foraging location of loggerhead turtles in the NWA, which will allow robust analyses of foraging ground effects on demography and improve the design of management strategies for the conservation of loggerhead populations. The conclusions and methods developed in this study are also relevant for other populations of sea turtles and for other highly migratory species.

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“…Like mark-recapture techniques, satellite tracking requires that transmitters do not alter health or behaviour. To date, it has mostly been used for breeding adults to study post-nesting migrations from nesting sites to foraging sites (Balazs et al, 1994;Cheng, 2000;Godley et al, 2002;Hatase et al, 2002;Hays et al, 2001;Hughes et al, 1998;Limpus and Limpus, 2001;Limpus et al, 1992;Luschi et al, 1996Luschi et al, , 1998Morreale et al, 1996;Mortimer and Balazs, 2000;Nichols et al, 2000;Papi et al, 1995;Roos et al, 2001). This methodology was also used for studying movements and diving behaviour on foraging areas or nesting areas (Godley et al, 2002;Hays et al, 1991Hays et al, , 1999Hays et al, , 2000Hays et al, , 2001Renaud and Carpenter, 1994;Stoneburner, 1982) and seasonal migrations (Bentivegna, 2002).…”

Section: Introductionmentioning

confidence: 99%

Oceanic survival and movements of wild and captive-reared immature green turtles (Chelonia mydas) in the Indian Ocean

Pelletier

Roos

Ciccione

2003

Aquatic Living Resources

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The ability of captive-reared turtles to survive in the wild is not precisely known, nor are movements of immature turtles in the open ocean. To provide information on these issues, a satellite tracking experiment was conducted in the western Indian Ocean to monitor oceanic movements of immature green turtles. Two wild turtles and four captive-reared individuals were tracked. The latter had been displaced after birth from nesting sites to a distant rearing site. Wild turtles survived after release, but did not move far away from release site. We hypothesize that this resident behaviour may be explained by stage-specific habitat requirements. Captive-reared turtles survived after release and migrated over thousands of kilometres. Among these, the oldest immature turtles retrieved the foraging sites of their native population, with movement patterns similar to those displayed by adults. Observed movements may be linked to hydrographic conditions such as general oceanic circulation, sea temperature and thermal fronts.

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Size-related differences in feeding habitat use of adult female loggerhead turtles Caretta caretta around Japan determined by stable isotope analyses and satellite telemetry

Cited by 247 publications

References 23 publications

Movement patterns of marine turtles in the Mediterranean Sea: a review

Movement patterns of marine turtles in the Mediterranean Sea: a review

Assignment of nesting loggerhead turtles to their foraging areas in the Northwest Atlantic using stable isotopes

Oceanic survival and movements of wild and captive-reared immature green turtles (Chelonia mydas) in the Indian Ocean

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