Eylem Seç
Characterization of Sea Turtles Aggregations in Uruguay (Southwestern Atlantic Ocean): The Ecology of the Green Turtle (Chelonia mydas) in Temperate Waters = Caracterización de la agregación de tortugas marinas en Uruguay (Atlántico Sur Occidental): ecología de la tortuga verde (Chelonia mydas) en zonas templadas
Başlık:
Characterization of Sea Turtles Aggregations in Uruguay (Southwestern Atlantic Ocean): The Ecology of the Green Turtle (Chelonia mydas) in Temperate Waters = Caracterización de la agregación de tortugas marinas en Uruguay (Atlántico Sur Occidental): ecología de la tortuga verde (Chelonia mydas) en zonas templadas
Yazar:
Vélez Rubio, Gabriela Manuela, author.
ISBN:
9780438147287
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (333 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Advisors: Jesús Tomás; Luis Cardona Committee members: Francisco J. Aznar; Asunción Borrell; Paolo Casale; Mariana Fuentes; Bojan Lazar; Laura Prosdocimi.
Özet:
Sea turtle spend most of their life cycle in water in foraging grounds occupying oceanic and coastal areas, depending on the species or the population. These habitats support high genetic diversity, converging turtles from multiple breeding populations, conforming a genetic mixed stock of juvenile turtles.
The South Western Atlantic (SWA) region extends the coastal and territorial waters of Brazil, Uruguay and Argentina. This region is a melting point of more than six sea turtle populations, sharing foraging and developmental grounds and migratory corridors of five species of turtles (the leatherback turtle, Dermochelys coriacea; the loggerhead turtle, Caretta caretta ; the green turtle, Chelonia mydas; the hawksbill turtle, Eretmochelys imbricate; and the olive ridley turtle, Lepidochelys olivacea; and. Also the SWA region shares most of the threats affecting sea turtle populations. The main threats are the bycatch by artisanal and industrial fisheries, marine debris interactions, hypothermia, Fibropapiloma (FPHTV) and ports dredging.
Foraging habitats are of especial importance for sea turtle conservation because (1) as we said before, turtles spent most of their life cycle in them and (2) these habitats host high genetic diversity.
In the last decade, our understanding on sea turtle foraging behaviour, habitat use and movements in foraging areas have been widened by the use of telemetry devices and stable isotopes analysis. The stable isotope analysis of tissues with a low turnover rate integrates dietary information during longer periods. Furthermore, stable isotope analyses give information about assimilated prey and not only on those consumed. In the last decades the satellite telemetry improve our understanding of connectivity between nesting and feeding areas, seasonal movements and spatio-temporal habitat use habitat use of sea turtles. The develop of new technologies also allow the researchers to satellite tracking early juveniles.
The aim of the present PhD Thesis is to increase the knowledge on biology and ecology of sea turtles in feeding and developmental waters of the Southwestern Atlantic Ocean. This study addresses different aspects of ecology, biology and threats of sea turtle in the Southwestern Atlantic region, focusing on the following objectives: 1- To characterize the sea turtle aggregation sin Uruguayan waters. 2- To describe the diet and the ontogenetic dietary shift of green turtles. 3- To assess the migratory route and seasonal movements of juvenile green turtles in the Southwestern Atlantic. 4- To infer the impact of two of the marine debris ingestion and hypothermia in the green turtle aggregation in Uruguayan coastal waters.
The study led to the following findings and conclusions: A total of 1107 stranded sea turtles a long the Uruguayan coast (annual mean +/- SD = 82 +/- 49.4, range 20--160). Five species were recorded: green turtles (N = 643; 58.1 %), loggerhead turtles (N = 329; 29.7 %), leatherback turtles (N = 131; 11.8 %), hawksbill turtles (N = 3; 0.3 %) and olive ridley (N = 1; 0.1 %). The coastal waters of Uruguay are used by green turtle juveniles [mean +/- SD curved carapace length (CCL) = 41.5 +/- 7.5 cm; range 25.7--94.5, N = 538; Fig. 3a]; large juveniles or adult sizes loggerhead turtles (CCL = 72.6 +/- 15.3 cm; range 10.3--114.6; N = 203); large juveniles and adult sizes leatherback turtles (CCL = 139.4 +/- 11.1 cm; range 110.5-- 160.0; N = 53); and sporadic records of the hawskbill turtle and olive ridley turtle. Most of the strandings recorded occurred in the oceanic influence area (Zone 3, N=593) and outer estuary area (Zone 2, N=261); and during the warmer months (austral summer and austral fall). The main threats for the loggerhead and leatherback turtle were the industrial (coastal bottom trawlers and pelagic longlines) and artisanal fisheries (set nets). The decomposition stage of the carcasses of these two species indicates the threats affecting them occur far from the coast. In the case of the green turtles, recorded in higher numbers and close to rocky promontories; the carcasses founded mainly fresh indicating coastal threats. The main threats are artisanal and sport fishing, ingestion and entanglement with marine debris, and hypothermia stunning among others. (Abstract shortened by ProQuest.).
Notlar:
School code: 5871
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(688092.1) | 688092-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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