Green turtles (Chelonia mydas) foraging at Arvoredo Island in Southern Brazil: genetic characterization and mixed stock analysis through mtDNA control region haplotypes

Proietti, Maí­ra Carneiro; Lara-Ruiz, Paula; Reisser, Júlia; Pinto, Luciano da Silva; Dellagostin, Odir A.; Marins, Luís Fernando

doi:10.1590/s1415-47572009000300027

Cited by 28 publications

(16 citation statements)

References 26 publications

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“…Increasing sample size did not change the proportion of CM-A8 and CM-A5 or the diversity indexes found by Proietti et al (2009) for green turtles around AI; however, the detection of rarer haplotypes increased. This increase could improve resolution of MSA estimates if the rarer haplotypes are also present at a given rookery; however, rare haplotypes may also lead to overestimated contributions from rookeries with uneven sample sizes (Formia et al 2007).…”

Section: Discussionmentioning

confidence: 73%

“…html). Additional sequences for AI (n = 49; Proietti et al 2009) were included in the analyses, totaling 115 samples. In order to verify differences between the study areas and other previously described Atlantic foraging grounds, exact tests of differentiation were conducted employing a Markov Chain Monte Carlo (MCMC) with 10 000 steps and 1000 burn-ins, using Arlequin 3.11 (Excoffier et al 2005).…”

Section: Data Analysis Mtdna Sequencesmentioning

confidence: 99%

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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: 73%

Section: Data Analysis Mtdna Sequencesmentioning

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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“…Green turtles using Brazilian waters for foraging are from mixed stocks, originating primarily from nesting assemblages at Ascension Island, Surinam, Aves Island and Trindade Island (Naro-Maciel et al 2007, Bondioli et al 2009, Proietti et al 2009). Migrations from nesting areas to foraging areas, mostly of long geographical distance, are a fundamental characteristic of the species and may be influenced by marine currents acting as a distribution mechanism (Naro-Maciel et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Using gut contents to assess foraging patterns of juvenile green turtles Chelonia mydas in the Paranaguá Estuary, Brazil

Guebert-Bartholo¹,

Barletta²,

Costa³

et al. 2011

Endang. Species. Res.

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This study investigated use of the Paranaguá Estuary as a foraging habitat by juvenile green turtles Chelonia mydas (L.) by comparing gut contents to available vegetal resources within the estuary. Between June 2004 and July 2007, the carcasses of 80 juvenile green turtles (carapace length range 29 to 73 cm) were found stranded (n = 71) or captured (n = 9) in fishing nets. The digestive tracts of 76 turtles contained food contents which were quantified (ml) and identified (e.g. algae, seagrass, mangrove propagules, mangrove vegetation and shells). Anthropogenic debris was classified by material, colour and size. Green turtles fed primarily on Halodule wrightii (42.9% of total volume), other vegetal resources (Ulva spp.: 6.7%; Avicennia shaueriana propagules: 10.1%) and other items (37.9%); ingested animal matter was seldom recorded (2.4%). The occurrence and/or availability of vegetal resources were assessed throughout the year. H. wrightii was ingested more frequently during the early rainy season, when the index of importance in the diet was higher (feeding index, FI: 97.3). Ulva spp. was ingested principally in the late dry season and A. shaueriana propagules in the late rainy season (FI: 23.9 and 12, respectively), when H. wrightii was not available. Anthropogenic debris was frequently ingested (69.7% of individuals), and was especially important in the late rainy season (FI: 60.3). This study highlights the importance of sheltered ecosystems such as the Paranaguá Estuary and adjacent regions in providing shelter, feeding grounds and resting areas for juvenile green turtles.

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“…In the winter the feeding grounds are also heavily influenced by the Prata River (Pimenta et al 2005). The rocky reefs, estuaries, bays, and coastal ecosystems are important feeding grounds for immature green sea turtles, C. mydas (e.g., Reisser et al 2008Reisser et al , 2013Proietti et al 2009;Guebert-Bartholo et al 2011;González Carman et al 2012).…”

mentioning

confidence: 99%

Direct Evidence for Gradual Ontogenetic Dietary Shift in the Green Turtle,Chelonia mydas

Morais

Santos

Longo

et al. 2014

Chelonian Conservation and Biology

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Green turtles (Chelonia mydas) foraging at Arvoredo Island in Southern Brazil: genetic characterization and mixed stock analysis through mtDNA control region haplotypes

Cited by 28 publications

References 26 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

Using gut contents to assess foraging patterns of juvenile green turtles Chelonia mydas in the Paranaguá Estuary, Brazil

Direct Evidence for Gradual Ontogenetic Dietary Shift in the Green Turtle,Chelonia mydas

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