The Kuroshio Extension Bifurcation Region: A pelagic hotspot for juvenile loggerhead sea turtles

Polovina, Jeffrey J.; Uchida, Itaru; Balazs, George H.; Howell, Evan A.; Parker, Denise M.; Dutton, Peter H.

doi:10.1016/j.dsr2.2006.01.006

Cited by 155 publications

(171 citation statements)

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“…The eastward-flowing Kuroshio and Kuroshio Extension regions, on the other hand, where shearwaters from MK feed, support major spawning and nursery grounds for various pelagic fishes, such as anchovy and sardine (Aoki & Miyashita 2000, Kasai et al 2002, Komatsu et al 2002, Sassa et al 2004, Takahashi & Watanabe 2004. Frontal cyclonic eddies in this region enhance primary and secondary productivity (Kimura et al 1997, 2000, Qiu 2001, supporting a range of predators, including, tunas, turtles, and seabirds (Kitagawa et al 2004, Takasuka et al 2004, Polovina et al 2006, Suryan et al 2006, Shaffer et al 2006.…”

Section: Seasonal Changes In Foraging Areamentioning

confidence: 99%

“…Seabirds from neighbouring colonies tend to feed in nonoverlapping zones to minimise intra-specific competition for food resources, with the zone of feeding habitat typically closer to a focal colony than any of the neighbouring colonies in the hinterland (Cairns 1989). Females of MK often used offshore areas along the Kuroshio and Kuroshio Extension, where productivity is locally enhanced by frontal cyclonic eddies in lowproductivity Kuroshio water, and where many predators congregate to feed (Kimura et al 1997, 2000, Kitagawa et al 2004, Polovina et al 2006. Waters of the Kuroshio and Kuroshio Extension are much closer to MK than to SA (Fig.…”

Section: Seasonal Changes In Foraging Areamentioning

confidence: 99%

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Foraging areas of streaked shearwaters in relation to seasonal changes in the marine environment of the Northwestern Pacific: inter-colony and sex-related differences

Yamamoto

Takahashi²,

Oka³

et al. 2011

Mar. Ecol. Prog. Ser.

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As the spatial distribution of marine organisms is often affected by seasonal changes, pelagic seabirds may change their foraging areas in response to seasonal changes in the marine environment. Here, we examined the foraging area of streaked shearwaters Calonectris leucomelas, breeding at Sangan (SA) and Mikura Islands (MK), Japan, from spring to summer during pre-laying and incubation periods. Those colonies are located at the north and south of the Northwestern Pacific's Kuroshio-Oyashio transition area where high seasonal temperature changes are observed, and where, consequently, birds may show comparable responses to such changes. Our results showed that streaked shearwaters from both colonies shifted their foraging areas northwards as the season progressed. The seasonal shift of foraging areas appeared to coincide with the movement pattern of pelagic fishes that migrate northward in association with the increase in water temperature. However, the pattern of seasonal movement differed between the 2 colonies; shearwaters from SA moved their foraging area along the coastal area of the Kuroshio-Oyashio transition, while those from MK moved along the Kuroshio Extension. Our results also indicated sex-related differences in this general pattern: females showed clear seasonal changes in foraging area, while males did not. During the pre-laying period males returned to the colony frequently to defend their nests or mates, and spent less time at sea. Our results suggest that streaked shearwaters changed their foraging areas in response to seasonal changes in the marine environment, although colony location and sex-related differences in reproductive roles may constrain the birds' responses to seasonal change.

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Section: Seasonal Changes In Foraging Areamentioning

confidence: 99%

Section: Seasonal Changes In Foraging Areamentioning

confidence: 99%

Foraging areas of streaked shearwaters in relation to seasonal changes in the marine environment of the Northwestern Pacific: inter-colony and sex-related differences

Yamamoto

Takahashi²,

Oka³

et al. 2011

Mar. Ecol. Prog. Ser.

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“…Animals from this subpopulation are genetically distinct from other loggerhead subpopulations [28]. Foraging hotspots for juveniles have been identified in the central North Pacific [29,30] and in the eastern Pacific off the Baja California Peninsula (BCP), Mexico [27,31,32]. Upon maturity, turtles migrate back to their natal beaches of Japan and remain in the western Pacific as adults [25,33].…”

Section: Introductionmentioning

confidence: 99%

Active dispersal in loggerhead sea turtles ( Caretta caretta ) during the ‘lost years’

et al. 2016

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Highly migratory marine species can travel long distances and across entire ocean basins to reach foraging and breeding grounds, yet gaps persist in our knowledge of oceanic dispersal and habitat use. This is especially true for sea turtles, whose complex life history and lengthy pelagic stage present unique conservation challenges. Few studies have explored how these young at-sea turtles navigate their environment, but advancements in satellite technology and numerical models have shown that active and passive movements are used in relation to open ocean features. Here, we provide the first study, to the best of our knowledge, to simultaneously combine a high-resolution physical forcing ocean circulation model with long-term multi-year tracking data of young, trans-oceanic North Pacific loggerhead sea turtles during their 'lost years' at sea. From 2010 to 2014, we compare simulated trajectories of passive transport with empirical data of 1-3 year old turtles released off Japan (29.7-37.5 straight carapace length cm). After several years, the at-sea distribution of simulated current-driven trajectories significantly differed from that of the observed turtle tracks. These results underscore current theories on active dispersal by young oceanic-stage sea turtles and give further weight to hypotheses of juvenile foraging strategies for this species. Such information can also provide critical geographical information for spatially explicit conservation approaches to this endangered population.

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“…Such residency in a mesoscale feature for several months implied that there were good foraging conditions. Indeed, such behaviour has been observed by other authors and for other sea turtle species with the conclusion that both warm and cold core eddies are associated with higher prey abundance (SHOOP & KEN- NEY, 1992;LUTCAVAGE, 1996;LUSCHI et al, 2003;FERRA-ROLI et al, 2004;HAYS et al, 2006;ECKERT, 2006;POLOVINA et al, 2006). SUÁREZ-MORALES et al, (2002) found that there are significant differences in the gelatinous communities between inside and outside an eddy in the Gulf of Mexico.…”

Section: Urochordatesmentioning

confidence: 80%

A leatherback tuttle’s guide to jellyfish in the North East Atlantic

Doyle¹,

Georges²,

Houghton³

2013

Munibe Monogr., nat. ser.

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Leatherback Dermochelys coriacea (Vandelli, 1761) sea turtles, are known to roam across entire oceans in search of high densities of their jellyfish food. Although this predator-prey relationship is well established, considerations of leatherback foraging behaviours are often hampered by a lack of information on the prey available to them in different regions. Therefore, to provide an overview for future studies we synthesise our current knowledge of jellyfish distributions and seasonality throughout the Northeast Atlantic and highlight known hotspots for the turtles themselves.KEY WORDS: Dermochelys, gelatinous zooplankton, medusae, Rhizostoma, La Rochelle, Pelagia and salps. RESUMENLas tortugas laúd Dermochelys coriacea (Vandelli, 1761), se conocen por recorrer océanos enteros, en busca de aprovisionamiento o alimento en zonas con grandes cantidades de zooplancton gelatinoso. Aunque la relación depredador-presa es bien conocida, el comportamiento de esta especie en relación a su alimentación es incompleta, debido a la falta de datos existentes en relación a la disponibilidad que existe de sus presas en las distintas regiones. Para proporcionar una visión general de la información relevante en este ámbito, hemos resumido el conocimiento que se tiene del zooplancton gelatinoso, su distribución y estacionalidad a lo largo del Noreste Atlántico y hemos querido resaltar puntos o zonas de especial importancia para las tortugas. PALABRAS CLAVES:Dermochelys, zooplancton gelatinoso, medusae, Rhizostoma, La Rochelle, Pelagia y salpas. LABURPENALarruzko dortokak Dermochelys coriacea (Vandelli, 1761), ozeanoetan barrena elikatzeko plankton lirdingatsuan aberats diren guneen bila ibiltzeagatik dira ezagunak. Naiz eta harrapakari-harrapakin harremana aski ezaguna izan, bere elikatzeko portaerak utsune handiak ditu oraindik, bere harrapakinen inguruko informazio ezagatik. Gai honekiko ikuspegi zabal bat ematearren, gaur egun zooplankton lirdingatsuaren inguruan dugun informazio esanguratsua laburbildu dugu artikulu honetan, Atlantiko Iparekialdean duen distribuzio eta urtaroaren arabeherako aldaketak eta bereziki itsas dortokentzat garrantzitsuak diren guneak azpimarratu nahi izan ditugu. KITAMURA, 2004). Some jellyfish (siphonophores) have been described as some of the longest animals on the planet measuring 20 metres long , in Bone 1998. This diversity of species is found in all oceans, from surface waters to the aphotic depths, with some eking out an unusual existence lying on the seafloor. GAKO-HITZAKThe manner in which jellyfish aggregate also varies markedly between species. Many form spectacular aggregations with many millions of individuals closely grouped, whereas other species are widely dispersed at much lower densities (GRAHAM et al., 2001). Taking this to the extreme, some animals which appear as individuals are in fact colonies such as the Portuguese Man-o-War Physalia physalis (Linnaeus, 1758) and Pyrosoma atlanticum (Péron, 1804) whilst other species can occur in both singular and colonial forms (e.g...

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The Kuroshio Extension Bifurcation Region: A pelagic hotspot for juvenile loggerhead sea turtles

Cited by 155 publications

References 8 publications

Foraging areas of streaked shearwaters in relation to seasonal changes in the marine environment of the Northwestern Pacific: inter-colony and sex-related differences

Foraging areas of streaked shearwaters in relation to seasonal changes in the marine environment of the Northwestern Pacific: inter-colony and sex-related differences

Active dispersal in loggerhead sea turtles ( Caretta caretta ) during the ‘lost years’

A leatherback tuttle’s guide to jellyfish in the North East Atlantic

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