Evidence for Synchronous Hatching in Marine Turtle (Caretta caretta) Embryos and Its Influence on the Timing of Nest Emergence

2021 ◽  
Vol 20 (2) ◽  
Author(s):  
Angela Field ◽  
Jessica K. McGlashan ◽  
Michael Salmon
Keyword(s):  
Caretta Caretta ◽  
Marine Turtle

Tetranucleotide markers from the loggerhead sea turtle (Caretta caretta) and their cross-amplification in other marine turtle species

2008 ◽  
Vol 10 (3) ◽  
pp. 577-580 ◽  
Author(s):  
Brian M. Shamblin ◽  
Brant C. Faircloth ◽  
Mark G. Dodd ◽  
Dean A. Bagley ◽  
Llewellyn M. Ehrhart ◽  
...  
Keyword(s):  
Caretta Caretta ◽  
Sea Turtle ◽  
Marine Turtle ◽  
Loggerhead Sea Turtle ◽  
Turtle Species ◽  
Cross Amplification

Patterns of Marine Turtle Mortality in British Waters (1992–1996) with Reference to Tissue Contaminant Levels

1998 ◽  
Vol 78 (3) ◽  
pp. 973-984 ◽  
Author(s):  
B.J. Godley ◽  
M.J. Gaywood ◽  
R.J. Law ◽  
C.J. McCarthy ◽  
C. McKenzie ◽  
...  
Keyword(s):  
Organic Contaminants ◽  
Sexual Maturity ◽  
Carapace Length ◽  
Caretta Caretta ◽  
Marine Turtle ◽  
Dermochelys Coriacea ◽  
Fishing Gear ◽  
Leatherback Turtles ◽  
Marine Turtles ◽  
Causes Of Mortality

Mortality patterns of marine turtles entangled in fishing gear, found dead at sea or stranded dead on and around the coast of Britain in the period 1992–1996 are described. Of a total of 38 dead turtles identified, 35 were leatherback turtles (Dermochelys coriacea) and three were loggerhead turtles (Caretta caretta). All D. coriacea were considered adults or subadults nearing sexual maturity. Six individuals were assessed as females, ten were classified as males and 19 were not sexed. Dermochelys coriacea (N=20 measured) ranged from 120 to 210 cm in curved carapace length (mean, 152 cm). The three C. caretta were juveniles, and ranged from 15 to 30 cm curved carapace length. Possible origins, causes of mortality and interactions with fisheries are discussed. In addition, contaminant levels were determined in the tissues of three D. coriacea. Concentrations of organic contaminants determined were found to be low.

scholarly journals Out-foxing the red fox: how best to protect the nests of the Endangered loggerhead marine turtle Caretta caretta from mammalian predation?

Oryx ◽  
2011 ◽  
Vol 46 (2) ◽  
pp. 223-228 ◽  
Author(s):  
David J. Kurz ◽  
Katherine M. Straley ◽  
Brett A. DeGregorio
Keyword(s):  
Red Fox ◽  
Loggerhead Turtle ◽  
Caretta Caretta ◽  
Ease Of Use ◽  
Marine Turtle ◽  
Artificial Nests ◽  
Nest Protection ◽  
Mammalian Predators ◽  
Deployment Time ◽  
Level Of Motivation

AbstractRecovery plans for the Endangered loggerhead marine turtle Caretta caretta cite mammalian predation as a major threat, and recommend nest protection efforts, already present at many rookery beaches, to protect eggs and hatchlings. Nest protection techniques vary but wire box cages and plastic mesh screens are two common tools used to deter predation by a host of beach-foraging, opportunistic mammalian predators. We empirically tested the efficacy of wire cages and plastic mesh screens in preventing red fox Vulpes vulpes predation on artificial nests. Both techniques averted fox predation (0%), whereas unprotected control nests suffered 33% predation under conditions of normal predator motivation, or a level of motivation stimulated by loggerhead turtle egg scent. However, in side-by-side comparisons under conditions of presumed high predator motivation, 25% of mesh screens were breached whereas no cage-protected nests were successfully predated. In addition to effectiveness at preventing predation, factors such as cost, ease of use, deployment time, and magnetic disturbance were evaluated. Our study suggests that the efficacy of plastic screens and the potential disadvantages associated with galvanized wire should influence selection of mechanical barriers on beaches where fox predation threatens loggerhead nests.

scholarly journals Notes on amphipods associated with loggerhead marine turtle Caretta caretta (Linnaeus, 1758) in south-eastern Brazil

Nauplius ◽  
2020 ◽  
Vol 28 ◽  
Author(s):  
Tammy Iwasa-Arai ◽  
Hugo Gallo Neto ◽  
Raquel Beneton Ferioli ◽  
Max Rondon Werneck
Keyword(s):  
Caretta Caretta ◽  
Marine Turtle ◽  
South Eastern ◽  
Eastern Brazil

Two New Blood Flukes from a Marine Turtle, Caretta caretta

1950 ◽  
Vol 36 (6) ◽  
pp. 595 ◽  
Author(s):  
Harold W. Manter ◽  
Mary I. Larson
Keyword(s):  
Caretta Caretta ◽  
Marine Turtle ◽  
Blood Flukes

scholarly journals Mercury and methylmercury in carapace of the marine turtle Caretta caretta, in northeastern Brazil and its potential for environmental monitoring

2019 ◽  
Vol 91 (2) ◽  
Author(s):  
CÉSAR AUGUSTO B. RODRIGUEZ ◽  
MOISES F. BEZERRA ◽  
CARLOS EDUARDO DE REZENDE ◽  
WANDERLEY R. BASTOS ◽  
LUIZ D. DE LACERDA
Keyword(s):  
Environmental Monitoring ◽  
Caretta Caretta ◽  
Marine Turtle ◽  
Northeastern Brazil

scholarly journals Protecting nests of the Critically Endangered South Pacific loggerhead turtle Caretta caretta from goanna Varanus spp. predation

Oryx ◽  
2019 ◽  
Vol 54 (3) ◽  
pp. 323-331 ◽  
Author(s):  
Christine A. Madden Hof ◽  
Gabriela Shuster ◽  
Nev McLachlan ◽  
Bev McLachlan ◽  
Saranne Giudice ◽  
...  
Keyword(s):  
Loggerhead Turtle ◽  
South Pacific ◽  
Caretta Caretta ◽  
Iucn Red List ◽  
Beach Erosion ◽  
Critically Endangered ◽  
Marine Turtle ◽  
Population Declines ◽  
The South ◽  
Cumulative Impact

AbstractThe South Pacific subpopulation of the loggerhead turtle Caretta caretta is categorized as Critically Endangered on the IUCN Red List because of significant population declines. Five Queensland beaches support high-density nesting of this subpopulation, but egg and hatchling survival are low at some beaches because of feral and native terrestrial predators. We quantified predation of loggerhead turtle eggs by two species of goanna, Varanus panoptes and Varanus varius, at Wreck Rock beach, one of the turtle's major nesting beaches. In addition, we conducted an experiment to determine the efficacy of a nest protection device. Predation rates at Wreck Rock beach were 15.2% for treatment and 45.8% for non-treatment clutches during the 2013–2014 nesting season. A higher probability of predation (64%) was predicted for the northern beach. Although nests were only partially predated (16.4% of the total number of eggs), nest loss to predators and beach erosion (caused by a cyclone) was 91.7%. If left unmanaged, the cumulative impact of predation and other threats, including those exacerbated by climate change, can cause unsustainable loss of loggerhead turtle nests. This study provides one of the first quantitative data sets on rates of loggerhead turtle clutch predation in the South Pacific. It enhances our understanding of goanna predation impacts and identifies an efficient predator exclusion device for mitigating the effects of terrestrial predators at Wreck Rock beach, and for protecting marine turtle nests across northern Australia and globally.

Low-Temperature Protection of Marine Turtle Eggs During Long-Distance Relocation

1989 ◽  
Vol 16 (3) ◽  
pp. 317 ◽  
Author(s):  
JL Harry ◽  
CJ Limpus
Keyword(s):  
Low Temperature ◽  
Sex Ratio ◽  
Embryonic Development ◽  
Incubation Period ◽  
Temperature Regime ◽  
Loggerhead Turtle ◽  
Caretta Caretta ◽  
Early Embryonic Development ◽  
Marine Turtle ◽  
Long Distance

Movement of marine turtle eggs, between about 3 hours and 3 weeks after oviposition, often results in substantial embryonic mortality. Eggs of the loggerhead turtle (Caretta caretta), which were cooled to 7-10�C within a few hours of oviposition, were relocated 1077 km in 14 h before being set at temperatures within the normal incubation range (26, 28 and 32�C). The percentage of viable embryos and hatchlings produced from these eggs was comparable to that of undisturbed eggs laid in natural nests. The incubation period and the sex ratio of the hatchlings, observed for each temperature regime, were unaffected by the initial cooling. Cooling C. caretta eggs effectively arrests early embryonic development, thereby extending the period during which eggs can be relocated without causing movement-induced mortality. This procedure is applicable in situations where turtle eggs must be transported for research or hatchery management purposes.

Diving and Heart Beat Compounds in the Marine Turtle Caretta caretta (LINNÉ) (Reptilia, Testudines)

1980 ◽  
Vol 1 (3) ◽  
pp. 337-341 ◽  
Author(s):  
R. Lloze ◽  
H. Roussel ◽  
A. Lanteri
Keyword(s):  
Caretta Caretta ◽  
Heart Beat ◽  
Marine Turtle ◽  
T Wave

AbstractElectrocardiograms were obtained from the marine turtle Caretta caretta, both on land and in water. A typical bradycardia was observed during forced and free diving. Alteration of the t wave occured during this bradycardia.

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