scholarly journals Estimating clutch frequency in the sea turtle Dermochelys coriacea using stopover duration

2006 ◽  
Vol 317 ◽  
pp. 285-295 ◽  
Author(s):  
P Rivalan ◽  
R Pradel ◽  
R Choquet ◽  
M Girondot ◽  
AC Prévot-Julliard
Keyword(s):  
Sea Turtle ◽  
Dermochelys Coriacea ◽  
Stopover Duration

scholarly journals Long-term decline of the western Pacific leatherback,Dermochelys coriacea: a globally important sea turtle population

Ecosphere ◽  
2013 ◽  
Vol 4 (2) ◽  
pp. art25 ◽  
Author(s):  
Ricardo F. Tapilatu ◽  
Peter H. Dutton ◽  
Manjula Tiwari ◽  
Thane Wibbels ◽  
Hadi V. Ferdinandus ◽  
...  
Keyword(s):  
Sea Turtle ◽  
Western Pacific ◽  
Dermochelys Coriacea ◽  
Turtle Population ◽  
The Western Pacific

scholarly journals Mycobacterium haemophilum infection in a juvenile leatherback sea turtle (Dermochelys coriacea)

2016 ◽  
Vol 28 (6) ◽  
pp. 718-721 ◽  
Author(s):  
Kyle Donnelly ◽  
Thomas B. Waltzek ◽  
James F. X. Wellehan ◽  
Nicole I. Stacy ◽  
Maria Chadam ◽  
...  
Keyword(s):  
Sea Turtle ◽  
Dermochelys Coriacea ◽  
Leatherback Sea Turtle ◽  
Mycobacterium Haemophilum

Fishing methods to reduce sea turtle mortality associated with pelagic longlines

2005 ◽  
Vol 62 (5) ◽  
pp. 965-981 ◽  
Author(s):  
John W Watson ◽  
Sheryan P Epperly ◽  
Arvind K Shah ◽  
Daniel G Foster
Keyword(s):  
North Atlantic ◽  
North Atlantic Ocean ◽  
Sea Turtles ◽  
Capture Rate ◽  
Sea Turtle ◽  
Mitigation Measures ◽  
Dermochelys Coriacea ◽  
Primary Target ◽  
Negative Effect ◽  
Catch Rates

Changes in hook design and bait type were investigated as measures to reduce the bycatch of sea turtles on pelagic longlines in the western North Atlantic Ocean. Specifically, the effectiveness of 18/0 circle hooks and mackerel (Scomber scombrus) bait was evaluated with respect to reducing sea turtle interactions and maintaining swordfish (Xiphias gladius) and tuna (Thunnus spp.) catch rates. Individually, circle hooks and mackerel bait significantly reduced both loggerhead (Caretta caretta) and leatherback (Dermochelys coriacea) sea turtle bycatch. Circle hooks also significantly reduced the rate of hook ingestion by the loggerheads, potentially reducing postrelease mortality. The combination of circle hooks and mackerel bait was even more effective for loggerhead turtles and had no negative effect on swordfish catch. These modifications in fishing methods, in conjunction with tools developed to remove hooks and line from the turtles, significantly reduced the capture rate of sea turtles and potentially the post-hooking mortality of those that were caught and did not negatively impact the primary target species catch rate. In addition, these mitigation measures have the potential to reduce mortality of sea turtles and other bycatch species worldwide.

Primary Multicentric Pulmonary Low-grade Fibromyxoid Sarcoma and Chelonid Alphaherpesvirus 5 Detection in a Leatherback Sea Turtle (Dermochelys coriacea)

2019 ◽  
Vol 168 ◽  
pp. 1-7 ◽  
Author(s):  
J. Díaz-Delgado ◽  
J.C. Gomes-Borges ◽  
A. Monteiro Silveira ◽  
J. Einhardt-Vergara ◽  
K.R. Groch ◽  
...  
Keyword(s):  
Sea Turtle ◽  
Dermochelys Coriacea ◽  
Low Grade ◽  
Fibromyxoid Sarcoma ◽  
Leatherback Sea Turtle

Tursiocola neliana sp. nov (Bacillariophyceae) epizoic on South African leatherback sea turtles (Dermochelys coriacea) and new observations on the genus Tursiocola

Phytotaxa ◽  
2020 ◽  
Vol 453 (1) ◽  
pp. 1-15 ◽  
Author(s):  
ROKSANA MAJEWSKA
Keyword(s):  
Sea Turtles ◽  
Central Area ◽  
Sea Turtle ◽  
Dermochelys Coriacea ◽  
Eastern Coast ◽  
New Taxon ◽  
Freshwater Turtles ◽  
Diatom Genus ◽  
Leatherback Sea Turtles ◽  
Internal Side

Tursiocola, a presumably exclusively epizoic diatom genus, comprises species found on various aquatic animals such as cetaceans, manatees, and marine and freshwater turtles. The genus is characterised by linear or lanceolate valves with well-developed pseudosepta at both poles, a valvocopula with three pairs of siliceous tabs, and a butterfly-like structure extending from the central nodule on the internal side of the valve. The current study describes a novel species of Tursiocola, T. neliana Majewska sp. nov. that grows epizoically on leatherback sea turtles from the Eastern Coast of South Africa based on detailed observations using light and scanning electron microscopy. The new taxon resembles the other currently known sea turtle-associated Tursiocola species in possessing relatively small, slightly heteropolar valves with acute apices and a strongly reduced butterfly structure on the internal side. However, T. neliana differs from all other members of the genus in being distinctly dorsiventral, with a clearly bowtie-shaped central area, unequal stria density on two sides of the raphe-sternum, and up to 8 areolae per stria. The description of the new taxon brings the total number of the sea turtle-associated Tursiocola species known so far up to four. An emended description of Tursiocola is proposed based on the new observations presented in this and other recent reports. Furthermore, the current understanding of the genus ecology is summarised.

Estimating past and present sex ratios of sea turtles in Suriname

1996 ◽  
Vol 74 (2) ◽  
pp. 267-277 ◽  
Author(s):  
Matthew H. Godfrey ◽  
N. Mrosovsky ◽  
R. Barreto
Keyword(s):  
Sea Turtles ◽  
Sex Ratios ◽  
Negative Relationship ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Dermochelys Coriacea ◽  
Green Turtles ◽  
Sand Temperature ◽  
Turtle Conservation ◽  
Sea Turtle Conservation

Leatherback (Dermochelys coriacea) and green (Chelonia mydas) sea turtles in Suriname lay eggs over several months of the year. During this nesting season, changes in rainfall produce changes in sand temperature, which in turn influence the sexual differentiation of incubating sea turtle embryos. The overall sex ratio of leatherback and green sea turtle hatchlings produced at Matapica beach in Suriname was investigated. Estimates of the sex ratios of these turtles in 1993 (green turtles 63.8% female, leatherbacks 69.4% female) were roughly 10% more female-biased than those from an earlier study in 1982. For both species, a significant negative relationship was found between monthly rainfall and monthly sex ratios. Using this relationship and data on rainfall in the past, it was possible to estimate overall sex ratios for an additional 12 years. These estimates varied considerably among different years, ranging from 20 to 90% female in the case of green turtles. Nevertheless, males tended to be produced primarily in April and May, while some females were produced in all months. Such seasonal patterns of production of turtles of different sexes have implications for sea turtle conservation programs that involve manipulating or harvesting eggs.

Oxygen Transport in the Leatherback Sea Turtle Dermochelys coriacea

1990 ◽  
Vol 63 (5) ◽  
pp. 1012-1024 ◽  
Author(s):  
Molly E. Lutcavage ◽  
Peter G. Bushnell ◽  
David R. Jones
Keyword(s):  
Oxygen Transport ◽  
Sea Turtle ◽  
Dermochelys Coriacea ◽  
Leatherback Sea Turtle

Changes in Gonadal and Adrenal Steroid Levels in the Leatherback Sea Turtle (Dermochelys coriacea) during the Nesting Cycle

2001 ◽  
Vol 122 (2) ◽  
pp. 139-147 ◽  
Author(s):  
David C Rostal ◽  
Janice S Grumbles ◽  
Kevin S Palmer ◽  
Valentine A Lance ◽  
James R Spotila ◽  
...  
Keyword(s):  
Sea Turtle ◽  
Dermochelys Coriacea ◽  
Adrenal Steroid ◽  
Leatherback Sea Turtle

Temporal patterns of target catch and sea turtle bycatch in the US Atlantic pelagic longline fishing fleet

2010 ◽  
Vol 67 (1) ◽  
pp. 42-57 ◽  
Author(s):  
Connie Y. Kot ◽  
Andre M. Boustany ◽  
Patrick N. Halpin
Keyword(s):  
Temporal Patterns ◽  
Sea Turtle ◽  
Fishing Effort ◽  
Dermochelys Coriacea ◽  
Fishing Gear ◽  
Thunnus Albacares ◽  
Moon Phase ◽  
The Us ◽  
Management And Conservation ◽  
Pelagic Longline

Sea turtle bycatch in pelagic longline fishing gear is an ongoing threat to the conservation of sea turtle populations. However, these bycatch events do not occur uniformly in space or time. Leatherback ( Dermochelys coriacea ) and loggerhead ( Caretta caretta ) bycatch rates reported in large fishing regions exhibited different degrees of interannual variability. Target catch and sea turtle bycatch in most regions displayed strong periodicity that corresponded to seasons (~365 days) and/or moon phase (~29 days). When trends in catch and bycatch rates were examined by month and moon phase, the significant periods of higher and lower catch and bycatch related to swordfish ( Xiphias gladius ), yellowfin tuna ( Thunnus albacares ), and sea turtle temporal distributions in foraging and spawning/nesting, oceanographic and prey conditions, and foraging behavior. Catch and bycatch rates tended to depend more on a seasonal rather than a lunar time scale, although there is likely an interaction between the two. These findings provide insights to the susceptibility of target catch and bycatch, regional and temporal patterns of fishing effort, and potential guidance for resource management and conservation.

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