Migrations of green turtles in the central South Pacific

Craig, Peter; Parker, Denise M.; Brainard, Russell E.; Rice, Marc; Balazs, George H.

doi:10.1016/s0006-3207(03)00217-9

Cited by 44 publications

(39 citation statements)

References 6 publications

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“…Although most authors agree that ocean currents influence sea turtle dispersal and migration, direct evidence exists mainly for post-pelagic animals. Craig et al (2004) compared the post-nesting migration routes of satellite-tagged female green turtles from Rose Atoll (Pacific Ocean) with surface drifter data and found that migration routes closely paralleled surface ocean currents. Luschi et al (1998) noted that post-nesting female green turtles satellite-tagged at Ascension Island followed prevailing ocean currents.…”

Section: Discussionmentioning

confidence: 99%

Green turtle Chelonia mydas mixed stocks in the western South Atlantic, as revealed by mtDNA haplotypes and drifter trajectories

Proietti¹,

Reisser²,

Kinas³

et al. 2012

Mar. Ecol. Prog. Ser.

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Genetic structure and natal origins of green turtle mixed stocks in southern Brazil were assessed based on analyses of mtDNA control region sequences from the Arvoredo Island (n = 115) and Cassino Beach (n = 101) feeding areas. These were compared to other mixed aggregations to examine structuring, and to Atlantic Ocean nesting colonies to evaluate natal origins through Bayesian mixed stock analysis (MSA). In order to develop novel priors, surface drifter trajectories in the Atlantic were analyzed and combined with rookery data, and we used KulbackLeibler information measures in order to compare the difference of information among the 4 proposed priors. Each study area presented 12 haplotypes, 10 of which were shared at similar frequencies. Haplotypes CM-A8 and CM-A5 represented ~60 and 20%, respectively, and remaining haplotypes accounted for < 5% of samples. The 2 study areas were genetically similar to all feeding grounds in the western South Atlantic except Almofala, in northeast Brazil, and genetically different from Caribbean and North American mixed stocks. Drifter trajectory analysis revealed that drifters from Ascension and Trindade Islands have a larger chance of reaching Brazil. The priors drifter data and rookery size/drifter data combined contained the most information, but stock estimates were not greatly changed. MSA indicated that Ascension, Aves/Surinam and Trindade were the main stock contributors to the study areas. Since impacts on mixed stocks may affect populations thousands of km away, the results presented here have important implications for the conservation of this endangered species.KEY WORDS: Green turtle · Feeding grounds · South Brazil · Genetic structure · Natal origins · Dispersal patternsResale or republication not permitted without written consent of the publisher

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Section: Discussionmentioning

confidence: 99%

Green turtle Chelonia mydas mixed stocks in the western South Atlantic, as revealed by mtDNA haplotypes and drifter trajectories

Proietti¹,

Reisser²,

Kinas³

et al. 2012

Mar. Ecol. Prog. Ser.

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“…In most leatherback populations, females cover extensive areas between nesting events, though normally stay within the continental shelf (Eckert et al, 2006;Georges et al, 2007;Hitipeuw et al, 2007). Despite some loggerhead, olive ridley, and green sea turtle (Chelonia mydas) populations undertaking oceanic loops during internesting periods (Blumenthal et al, 2006;McMahon et al, 2007) and flatback sea turtles (Natator depressus) demonstrating variable behaviors in Western Australia (Waayers et al, 2011;Whittock et al, 2014), most hard shelled turtles tend to stay close to their nesting beaches (loggerheads: Godley et al, 2003;greens: Hays et al, 1999;Craig et al, 2004;Troëng et al, 2005;Fuller et al, 2008; Shaver and Rubio, 2008). This intense habitat use allows for more targeted conservation measures .…”

Section: Internesting Estuarine Movementsmentioning

confidence: 99%

Informing Marine Protected Area Designation and Management for Nesting Olive Ridley Sea Turtles Using Satellite Tracking

Dawson

Formia²,

Agamboué³

et al. 2017

Front. Mar. Sci.

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Understanding the horizontal and vertical habitat of olive ridley sea turtles (Lepidochelys olivacea), a threatened species, is critical for determining regions for protection and relevant gear modifications that may effectively reduce bycatch, the largest threat to this species. Satellite transmitters were used to determine the movement and dive behavior of 21 female olive ridley turtles tagged in Pongara National Park, Gabon during the 2012, 2013, and 2015 nesting seasons. A switching state-space model was used to filter the tracking data and categorize the internesting and post-nesting movements. Gridded utilization distribution (UD) home range analysis of tracking data revealed that the entire core habitat occurred in the Komo Estuary during the internesting period. Within the Komo Estuary, 58% of this core UD occurred in shipping lanes. Dive data from the 2015 tagging season revealed that during the internesting period, turtles spent the majority of their time resting on the estuary seabed. Approximately 20% of all dive time was spent on the bottom and all maximum dive depths corresponded to the depth of the seabed, indicating that bottom set gear during the internesting period may pose the greatest potential for fisheries interactions. National parks currently protect many of the nesting sites and the Gabon Bleu initiative has formally designated 10 new marine parks and a network of community and industrial fishing zones; this data was a layer used in determining the park and zone boundaries. Shared use of the estuary by fisheries, shipping, and olive ridley turtles creates a need for management measures to reduce interactions. Thus, the results from this study can further provide detailed information that can be used to support the development of evidence-based management plans.

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“…Papi et al 1997;Blumenthal et al 2006;Hawkes et al 2007;Girard et al 2009) and green turtles (e.g. Luschi et al 1996;Cheng 2000;Craig et al 2004;Seminoff et al 2008), as are the small-scale internesting movements performed by loggerheads, also typically recorded elsewhere (Stoneburner 1982;Limpus & Limpus 2001). Given that in the Mediterranean the largest Figure 6.…”

Section: General Considerationsmentioning

confidence: 99%

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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Migrations of green turtles in the central South Pacific

Cited by 44 publications

References 6 publications

Green turtle Chelonia mydas mixed stocks in the western South Atlantic, as revealed by mtDNA haplotypes and drifter trajectories

Green turtle Chelonia mydas mixed stocks in the western South Atlantic, as revealed by mtDNA haplotypes and drifter trajectories

Informing Marine Protected Area Designation and Management for Nesting Olive Ridley Sea Turtles Using Satellite Tracking

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

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