scholarly journals On the dispersal of leatherback turtle hatchlings from Mesoamerican nesting beaches

2012 ◽  
Vol 279 (1737) ◽  
pp. 2391-2395 ◽  
Author(s):  
George L. Shillinger ◽  
Emanuele Di Lorenzo ◽  
Hao Luo ◽  
Steven J. Bograd ◽  
Elliott L. Hazen ◽  
...  
Keyword(s):  
Large Scale ◽  
Early Life History ◽  
Eastern Pacific ◽  
Dermochelys Coriacea ◽  
Conservation Strategies ◽  
Leatherback Turtles ◽  
Leatherback Turtle ◽  
Emergence Period ◽  
Eddy Transport ◽  
Nesting Beaches

So little is known about the early life history of leatherback turtles ( Dermochelys coriacea ) from hatchling to adulthood that this period has been termed the ‘lost years’. For critically endangered eastern Pacific leatherback populations, continued and rapid declines underscore the urgent need to develop conservation strategies across all life stages. We investigate leatherback hatchling dispersal from four Mesoamerican nesting beaches using passive tracer experiments within a regional ocean modelling system. The evolution of tracer distribution from each of the nesting beaches showed the strong influence of eddy transport and coastal currents. Modelled hatchlings from Playa Grande, Costa Rica, were most likely to be entrained and transported offshore by large-scale eddies coincident with the peak leatherback nesting and hatchling emergence period. These eddies potentially serve as ‘hatchling highways’, providing a means of rapid offshore transport away from predation and a productive refuge within which newly hatched turtles can develop. We hypothesize that the most important leatherback nesting beach remaining in the eastern Pacific (Playa Grande) has been evolutionarily selected as an optimal nesting site owing to favourable ocean currents that enhance hatchling survival.

scholarly journals Large-scale movements and high-use areas of western Pacific leatherback turtles,Dermochelys coriacea

Ecosphere ◽  
2011 ◽  
Vol 2 (7) ◽  
pp. art84 ◽  
Author(s):  
Scott R. Benson ◽  
Tomoharu Eguchi ◽  
Dave G. Foley ◽  
Karin A. Forney ◽  
Helen Bailey ◽  
...  
Keyword(s):  
Large Scale ◽  
Western Pacific ◽  
Dermochelys Coriacea ◽  
Leatherback Turtles

Predicting seasonal occurrence of leatherback turtles (Dermochelys coriacea) in eastern Canadian waters from turtle and ocean sunfish (Mola mola) sighting data and habitat characteristics

2019 ◽  
Vol 97 (5) ◽  
pp. 464-478
Author(s):  
A. Mosnier ◽  
J.-F. Gosselin ◽  
J. Lawson ◽  
S. Plourde ◽  
V. Lesage
Keyword(s):  
Large Scale ◽  
Habitat Characteristics ◽  
Seasonal Occurrence ◽  
Dermochelys Coriacea ◽  
Seasonal Development ◽  
Eastern Canada ◽  
Leatherback Turtles ◽  
Western Atlantic ◽  
Ocean Sunfish ◽  
Mola Mola

Part of the western Atlantic population of leatherback turtles (Dermochelys coriacea (Vandelli, 1761)) forage in Canadian waters, where high-use areas have been identified using satellite telemetry and opportunistic sightings. Here, we use sightings of leatherback turtles and ocean sunfish (Mola mola (Linnaeus, 1758)) obtained during a systematic large-scale aerial survey, along with opportunistic turtle sightings, to examine the seasonal occurrence and distribution of leatherback turtles in eastern Canada. Using environmental correlates, we predict the spatial and seasonal development of potentially suitable habitats. All data sets confirmed the presence of leatherback turtles off Nova Scotia during summer. They also highlighted turtle occurrence off southern Newfoundland. Opportunistic sightings suggest a seasonal shift in main turtle concentrations from southwest to northeast, with use of southern Newfoundland waters extending into September. A generalized additive model linking environmental characteristics and turtle observations suggests adding the Grand Banks off Newfoundland and waters east of Anticosti Island in the Gulf of St. Lawrence to the potentially important habitat for leatherback turtles. Direct observations helped delineate habitat currently used by leatherback turtles. In the context of climate change, this modelling approach may improve our ability to forecast changes in turtle habitat suitability and the risks of entrapment or collision associated with potentially changing usage patterns.

Changes in diel diving patterns accompany shifts between northern foraging and southward migration in leatherback turtles

2006 ◽  
Vol 84 (5) ◽  
pp. 754-765 ◽  
Author(s):  
M.C. James ◽  
C.A. Ottensmeyer ◽  
S.A. Eckert ◽  
R.A. Myers
Keyword(s):  
Dermochelys Coriacea ◽  
Leatherback Turtles ◽  
Leatherback Turtle ◽  
Marine Predator ◽  
The North ◽  
Surface Time ◽  
Northern Latitudes ◽  
Diel Vertical Migrations ◽  
The Difference ◽  
Southward Migration

Diel diving patterns have been widely documented among plankton-feeding marine vertebrates. In many cases, these patterns have been interpreted as a response to the diel vertical migrations of prey. The leatherback turtle, Dermochelys coriacea (Vandelli, 1761), is a large marine predator that exploits gelatinous plankton in disparate foraging areas. Individuals of this species spend extended periods at northern latitudes before moving southward through pelagic waters. To identify and compare potential diel patterns of diving behaviour in temperate areas, where foraging has been observed, versus during southward migration, 15 subadult and adult leatherbacks were equipped with satellite-linked time–depth recorders off Nova Scotia, Canada. We observed variation in nocturnal versus diurnal behaviour, both at northern latitudes and during migration; however, diel differences in both diving and surface activity were much less pronounced while leatherbacks were in the north. We interpret the difference in leatherback diel diving regimen to reflect a response to changing resource conditions at these times, with leatherbacks foraging throughout the day and night at high latitudes, then changing to a bimodal pattern of diving during southward migration, with generally longer, deeper diving occurring during the night versus during the day. By quantifying diel changes in leatherback behaviour, we provide the first surface time correction factors based on multiple individuals for use in estimating abundance from aerial surveys.

scholarly journals Large-scale investment in the excavation and “camouflaging” phases by nesting Leatherback Turtles (Dermochelys coriacea)

2016 ◽  
Vol 94 (6) ◽  
pp. 443-448 ◽  
Author(s):  
Thomas J. Burns ◽  
Hannah Davidson ◽  
Malcolm W. Kennedy
Keyword(s):  
Oxygen Consumption ◽  
Site Selection ◽  
Large Scale ◽  
Nest Site ◽  
Physiological Stress ◽  
Nest Site Selection ◽  
Dermochelys Coriacea ◽  
Leatherback Turtles ◽  
Scattering Phase ◽  
Nesting Season

Nesting female Leatherback Turtles (Dermochelys coriacea (Vandelli, 1761)) are ungainly and vulnerable to predation, stranding, and physiological stress, dangers encountered repeatedly in a nesting season. Minimising these risks must be balanced against optimising investment in nest-site selection, excavation, refilling, and concealment of their egg clutches. We investigated the relative investment in the different phases of nesting in Leatherback Turtles by recording the duration of, and respiratory frequency during, each phase. Nest excavation and the final sand scattering (usually termed “camouflage” or “disguise”) phases were the longest in duration. By combining the relative durations of nesting phases with literature estimates of oxygen consumption, we found that these may be the most expensive phases energetically, sand scattering in particular. Leatherback Turtles follow convoluted paths during the sand scattering phase, which were mapped and measured. They disturb large areas (mean (±SD) 30.3 ± 11.1 m2, maximum 57 m2), the centroids of which were always offset from the nest itself. Interestingly, in none of 26 nestings observed did the centre line of females move over the nest itself. Nesting Leatherbacks therefore invest heavily in obscuring the egg clutch, and the pattern of their movements in doing so suggests decoy behaviour.

scholarly journals Protected areas host important remnants of marine turtle nesting stocks in the Dominican Republic

Oryx ◽  
2012 ◽  
Vol 46 (3) ◽  
pp. 348-358 ◽  
Author(s):  
Ohiana Revuelta ◽  
Yolanda M. León ◽  
Pablo Feliz ◽  
Brendan J. Godley ◽  
Juan A. Raga ◽  
...  
Keyword(s):  
Dominican Republic ◽  
Protected Areas ◽  
National Park ◽  
Chelonia Mydas ◽  
Marine Turtle ◽  
Dermochelys Coriacea ◽  
The South ◽  
Leatherback Turtles ◽  
Leatherback Turtle ◽  
The Status

AbstractNesting by marine turtles in the Caribbean has declined considerably, mainly because of human exploitation, but there has previously been no monitoring in the Dominican Republic. We present the first detailed assessment of the status of marine turtle nesting in the country, based on surveys during 2006–2010. Nesting populations of hawksbill Eretmochelys imbricata and leatherback turtle Dermochelys coriacea are of regional importance and the green turtle Chelonia mydas is still present, although nesting in low numbers. The two main nesting sites are within protected areas: the Jaragua National Park in the south-west, important for leatherback turtles (mean of 126 nests per season), and Del Este National Park on Saona Island in the south-east, principally for hawksbill turtles (mean of 100 nests per season). Comparison with historical data suggests all rookeries are profoundly reduced in size. Although the main nesting beaches are within protected areas, illegal egg-take and meat consumption continues there, and also elsewhere in the country.

scholarly journals Leatherback turtles (Dermochelys coriacea) in the Gulf of Venezuela: An update stranding assessment 2001-2014

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Daniela Rojas-Cañizales ◽  
Nínive Espinoza-Rodríguez ◽  
María Alejandra Rodríguez ◽  
Jordano Palmar ◽  
María Gabriela Montiel-Villalobos ◽  
...  
Keyword(s):  
Dry Season ◽  
Dermochelys Coriacea ◽  
Leatherback Turtles ◽  
Leatherback Turtle ◽  
Fisheries Bycatch ◽  
The Caribbean ◽  
Minimum Estimate ◽  
The Impact

Leatherback turtle (Dermochelys coriacea) is highly impacted by fisheries’ bycatch worldwide. This study updates and estimates the leatherback turtle stranding records from 2001 to 2014 in the Gulf of Venezuela. Eighty-six stranded leatherback turtles were documented in the coast of the Gulf of Venezuela. Immature leatherback turtles were the most affected (85.1%) and the highest number of strandings were recorded during the dry season (55.8%). Our findings represent the minimum estimate of stranding events for the Gulf of Venezuela, especially considering the current lack of fisheries regulations. This is the latest update for the leatherback turtle strandings in the Gulf of Venezuela and could help to create new management solutions in the area aiming to minimize the impact on leatherback turtle populations in the Caribbean.

Three species of Digenea from the Atlantic leatherback turtle (Dermochelys coriacea)

1979 ◽  
Vol 57 (9) ◽  
pp. 1825-1829 ◽  
Author(s):  
William Threlfall
Keyword(s):  
Newfoundland And Labrador ◽  
Dermochelys Coriacea ◽  
Leatherback Turtles ◽  
Leatherback Turtle ◽  
Digenetic Trematodes ◽  
The Status

Three species of digenetic trematodes (Pyelosomum renicapite, Calycodes anthos, Cymatocarpus sp. (?)), are reported from two Atlantic leatherback turtles (Dermochelys coriacea) taken off the coast of Newfoundland and Labrador, in 1973. The status of the genera Pyelosomum Looss, 1899 and Astrorchis Poche, 1925 is discussed.

scholarly journals MENDUKUNG UPAYA PERLINDUNGAN PENYU BELIMBIMG (Dermochelys coriacea) MELALUI PENDIDIKAN (PROGRAM KKN WAU-WEYAF, ABUN)

2021 ◽  
Vol 2 (2) ◽  
pp. 51
Author(s):  
Freddy Pattiselanno ◽  
Natanael Natumnea ◽  
Kuswanto Kuswanto ◽  
Muhamad Ansarudin ◽  
Yosefina M. Goban ◽  
...  
Keyword(s):  
Religious Education ◽  
Community Service ◽  
Formal Education ◽  
Public Awareness ◽  
Egg Laying ◽  
Dermochelys Coriacea ◽  
Service Program ◽  
Leatherback Turtles ◽  
Leatherback Turtle ◽  
Keywords Education

ABSTRACT Wau-Weyaf Beach is the nesting ground of six species of turtles, including the world's largest turtle, the leatherback turtle (Dermochelys coriacea). The University of Papua (UNIPA) Manokwari, since 2009 has been directly involved in the turtle nesting area protection program by involving the students of UNIPA through the Community Service Program (KKN). In 2016, students carried out the KKN Program starting from June 30th to August 16th in Kampung Wau-Weyaf, one of the leatherback turtles’ egg-laying locations in Abun. This paper is a part of the Community Service Program which is carried out in the said village. The activities conducted during the KKN include both formal and non-formal education, religious education, and environmental education. Education-based KKN directly helps to improve public awareness which, in turn, supports the efforts to protect and save the leatherback turtles (Dermochelys coriacea) on the coast of Abun, Tambrau. The same approach is also able to improve the calistung (the capability to read, write, and count) ability of school children along with their awareness to maintain the cleanliness of their homes, school, and village environment. Keywords: Education; Conservation; Turtle; Wau-Weyaf   ABSTRAK Pantai Wau-Weyaf merupakan tempat bertelur bagi 6 jenis penyu, termasuk penyu terbesar di dunia, Penyu Belimbing (Dermochelys coriacea). Universitas Papua (UNIPA) Manokwari, sejak tahun 2009 telah terlibat secara langsung dalam program perlindungan kawasan peneluran penyu ini melalui pelibatan mahasiswa melalui program Kuliah Kerja Nyata (KKN). Pada tahun 2016,  mahasiswa Universitas Papua (UNIPA) melaksanakan program KKN yang dilaksanakan antara tanggal 30 Juni sampai dengan 16 Agustus 2016 di Kampung Wau-Weyaf. Tulisan ini merupakan bagian dari pelaksanaan kegiatan KKN yang dilaksanakan di kampung Wau-Weyaf sebagai salah satu lokasi peneluran telur penyu belimbing di Abun.  Kegiatan yang dilakukan meliputi pendidikan formal dan non-formal, pendidikan agama, dan pendidikan lingkungan. KKN berbasis pendidikan yang dilakukan secara langsung membantu meningkatkan penyadar tahuan masyarakat yang menunjang usaha perlindungan dan penyelamatan penyu belimbing (Dermochelys coriacea) di pesisir Abun, Tambrau. Pendekatan yang sama juga mampu meningkatkan kemampuan calistung anak-anak sekolah dan kesadaran menjaga kebersihan lingkungan rumah, sekolah dan kampung. Kata kunci: Pendidikan; Konservasi; Penyu; Wau-Weyaf

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