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A study on the Gut contents of live Juvenile Loggerhead Turtles, Caretta Caretta (Linnaeus) (Reptilia, Cheloniidae), from the South-Eastern part of the North Atlantic Ocean, with emphasis on Coelenterate Identification Naturalis
Nierop, M.M. van; Hartog, J.C. den.
The gut contents of five juvenile individuals of the loggerhead turtle Caretta caretta (L.) from waters around Madeira, Selvagem Grande (Selvagens Islands) and São Miguel (Azores) were analysed macro- and microscopically. Macroscopic investigations showed that epipelagic salps (e.g., Pyrosoma atlanticum Péron) and gastropods (e.g., Ianthina spp. and Pterotrachea spp.) constituted an important part of the food remains present in these loggerheads. To a lesser extent this also holds for organisms such as goose-barnacles (Lepas spp.). and Idotea metallica Bosc, which live on drifting materials, including algae. Microscopic examination revealed the presence in all turtles of large numbers of nematocysts, deriving mainly from Siphonophora and to a lesser extent...
Tipo: Article / Letter to the editor Palavras-chave: Cheloniidae; Caretta caretta; Food; Nematocysts; Siphonophora; Hydromedusae; Scyphozoa; Crustacea; Mollusca; Tunicata; South-eastern North Atlantic; 42.82.
Ano: 1984 URL: http://www.repository.naturalis.nl/record/319311
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Combined use of mitochondrial and nuclear genetic markers further reveal immature marine turtle hybrids along the South Western Atlantic Genet. Mol. Biol.
Brito,Cíntia; Vilaça,Sibelle Torres; Lacerda,Ana Luzia; Maggioni,Rodrigo; Marcovaldi,Maria Ângela; Vélez-Rubio,Gabriela; Proietti,Maíra Carneiro.
Abstract Marine turtle hybridization is usually sporadic and involves reports of only a few individuals; however, Brazilian populations have high hybridization rates. Here we investigated the presence of hybrids in morphologically identified immature hawksbills (Eretmochelys imbricata) along the South Western Atlantic (SWA). We sequenced one mitochondrial (D-Loop) and three nuclear DNA (RAG1, RAG2, and CMOS) markers to better understand the patterns and characteristics of hybrids. We identified 22 hybrids (n = 270), 11 of them at the extreme South of the SWA. Uruguay had the highest hybrid frequency in the SWA (~37.5%) followed by southern Brazil with 30%. These are common areas for loggerheads (Caretta caretta) but uncommon for hawksbills, and these...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hybridization; Cheloniidae; Genetic markers; Hybrid distribution; Conservation.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000400704
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Influence of artificial lights on the orientation of hatchlings of Eretmochelys imbricata in Pernambuco, Brazil Rev. Bras. Zool.
Simões,Thyara Noely; Silva,Arley Candido da; Moura,Carina Carneiro de Melo.
ABSTRACT Sea turtle hatchlings, in natural abiotic conditions, emerge from their nests at night and go directly to the sea, following the moonlight’s reflection in the ocean. Increased human activities such as tourism and artificial lights on the coasts, however, have interfered with the ability of sea turtle neonates to find their correct destination, negatively affecting their survival rates. Here we endeavored to assess the influence of artificial lights on the hatchlings of the sea turtle Eretmochelys imbricata (Linnaeus, 1766) in the south coast of the state of Pernambuco, Brazil. To that end, 10 experiments were conducted with 15 hatchlings/test subjects. Five experiments took place in artificially illuminated areas and five in non-illuminated areas....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anthropogenic impacts; Cheloniidae; Conservation; Hawksbill turtle; Light pollution.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702017000100308
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Turtle cleaners: reef fishes foraging on epibionts of sea turtles in the tropical Southwestern Atlantic, with a summary of this association type Neotropical Ichthyology
Sazima,Cristina; Grossman,Alice; Sazima,Ivan.
In the present study we record several instances of reef fish species foraging on epibionts of sea turtles (cleaning symbiosis) at the oceanic islands of Fernando de Noronha Archipelago and near a shipwreck, both off the coast of Pernambuco State, northeast Brazil. Nine reef fish species and three turtle species involved in cleaning are herein recorded. Besides our records, a summary of the literature on this association type is presented. Postures adopted by turtles during the interaction are related to the habits of associated fishes. Feeding associations between fishes and turtles seem a localized, albeit common, phenomenon.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cleaning symbiosis; Foraging association; Cheloniidae; Tropical Western Atlantic.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000100023
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