Polymodal foraging in adult female loggerheads (Caretta caretta)

Reich, Kimberly J.; Bjorndal, Karen A.; Frick, Michael G.; Witherington, Blair E.; Johnson, Constance A.; Bolten, Alan B.

doi:10.1007/s00227-009-1300-4

Cited by 77 publications

(68 citation statements)

References 36 publications

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“…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 Considerationsmentioning

confidence: 99%

“…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: 98%

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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 Considerationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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

Luschi

Casale

2014

Italian Journal of Zoology

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“…Finally, we used the isotopic values from epidermis samples of nesting turtles not fitted v www.esajournals.org with satellite transmitters from BHI in North Carolina (n ¼ 18) and WAS in Georgia (n ¼ 47), in combination with published isotopic data from nesting turtles at four nesting areas in Florida (n ¼ 310; Reich et al 2010) (Table 1), to compare to those of turtles with known foraging ground to assign them to one of the three geographic areas used by adult loggerheads in the NWA.…”

Section: Data and Sample Collectionmentioning

confidence: 99%

“…Our study incorporated previously published stable isotope values of epidermis from adult female loggerheads nesting in Florida beaches from Reich et al (2010). Additionally, Vander Zanden et al (2010) collected scute (carapace keratin) from a subsample of these loggerheads to investigate the long-term consistency in resource use through stable isotope analysis of scute layers.…”

Section: Foraging Locations Of Adult Female Loggerheads In the Nwamentioning

confidence: 99%

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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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Seasonal encounter rate, life stages and main threats to the loggerhead sea turtle (Caretta caretta) in the Aeolian Archipelago (southern Thyrrenian Sea)

Blasi¹,

Mattei²

2017

Aquatic Conservation

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1. Annual and seasonal encounter rates, life stages and the main threats to loggerhead sea turtles (Caretta caretta) in the Aeolian Archipelago (southern Italy) were studied. 2. Dedicated boat surveys resulted in 258 surface observations and 138 captures of healthy (n = 309), ailing (n = 66) and dead (n = 21) turtles from 2009 to 2013.3. Loggerheads were encountered at the sea water surface while resting (87%) or feeding on pelagic prey (13%).4. The loggerhead encounter rate (observations per km surveyed) was higher during the autumn, suggesting the presence of potential foraging/overwintering habitats in the area.5. The mean (± SD) curved carapace length (CCL) was 48.8 ± 10.7 cm, with 65% of the individuals ranging from 40-70 cm in size. Smaller turtles were encountered more frequently during the spring months, probably as a result of the abundant pelagic prey within the coastal area. During the colder season, larger turtles were more common in the afternoon than in the morning, suggesting that the time needed for rewarming might increase with turtle size.6. Ingestion of anthropogenic debris was reported in 48.5% of the rescued turtles. Individual mortality was mainly related to longline fishing (70.6%), with debris entanglements/ingestion frequently associated with these records. Longline bycatch and boat collisions were higher in summer, whereas debris ingestion was highest in spring. Different threats might affect particular life stages because the longline bycatch was more frequent for larger turtles, whereas boat collisions were more frequent with smaller individuals. 7. Migratory patterns, habitat characteristics and seasonal changes in sea temperature and currents might influence the seasonal occurrence of loggerhead turtles in this area.8. These results increase the current ecological knowledge of the factors driving loggerhead turtle life and are important for implementing management plans for its conservation in the Mediterranean Sea.

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Polymodal foraging in adult female loggerheads (Caretta caretta)

Cited by 77 publications

References 36 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

Seasonal encounter rate, life stages and main threats to the loggerhead sea turtle (Caretta caretta) in the Aeolian Archipelago (southern Thyrrenian Sea)

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