Somatic Growth Rates of Green Turtles (Chelonia mydas) and Hawksbills (Eretmochelys imbricata) in the Galápagos Islands

2015 ◽  
Vol 49 (4) ◽  
pp. 641-648 ◽  
Author(s):  
Patricia M. Zárate ◽  
Karen A. Bjorndal ◽  
Jeffrey A. Seminoff ◽  
Peter H. Dutton ◽  
A. B. Bolten
Keyword(s):  
Growth Rates ◽  
Somatic Growth ◽  
Chelonia Mydas ◽  
Galapagos Islands ◽  
Galápagos Islands ◽  
Eretmochelys Imbricata ◽  
Green Turtles

scholarly journals Somatic growth rates of immature green turtles Chelonia mydas inhabiting the foraging ground Akumal Bay in the Mexican Caribbean Sea

2017 ◽  
Vol 487 ◽  
pp. 68-78 ◽  
Author(s):  
Vanessa Labrada-Martagón ◽  
Fernando A. Muñoz Tenería ◽  
Roberto Herrera-Pavón ◽  
Ana Negrete-Philippe
Keyword(s):  
Growth Rates ◽  
Somatic Growth ◽  
Caribbean Sea ◽  
Chelonia Mydas ◽  
Green Turtles ◽  
Mexican Caribbean

Sex Ratio and Sex-Specific Growth Rates of Immature Green Turtles, Chelonia mydas, in the Southern Bahamas

Copeia ◽  
1992 ◽  
Vol 1992 (4) ◽  
pp. 1098 ◽  
Author(s):  
Alan B. Bolten ◽  
Karen A. Bjorndal ◽  
Janice S. Grumbles ◽  
David W. Owens
Keyword(s):  
Sex Ratio ◽  
Growth Rates ◽  
Specific Growth ◽  
Chelonia Mydas ◽  
Green Turtles ◽  
Specific Growth Rates

Demography and foraging ecology of Chelonia mydas on tropical shallow reefs in Bahia, Brazil

2015 ◽  
Vol 96 (6) ◽  
pp. 1295-1304 ◽  
Author(s):  
Adriana Jardim ◽  
Milagros López-Mendilaharsu ◽  
Francisco Barros
Keyword(s):  
Red Algae ◽  
Foraging Ecology ◽  
Activity Patterns ◽  
Somatic Growth ◽  
Growth Dynamics ◽  
Chelonia Mydas ◽  
Annual Growth Rate ◽  
Life Stages ◽  
Green Turtles ◽  
Spatial Use

Long-term tagging studies, particularly those that target life stages away from nesting beaches can provide important insights in key life history traits, which are essential for the effective management of endangered species. The coast of Bahia hosts important green turtle foraging areas, but information on demography, spatial use and foraging ecology in this region is lacking. Here, we (1) examined the size-class structure of green turtles in Bahia, (2) compared the size distribution from Bahia to other foraging aggregations in Brazil, and (3) studied the somatic growth dynamics. Additionally, we investigated the (4) diet, (5) habitat use and (6) activity patterns of green turtles along shallow reefs in Bahia. From 2009 to 2013, 322 green turtles were captured and 44 were recaptured between 7 and 1218 days after initial tagging. Curved carapace length varied from 32.9 to 122.5 cm. Mean annual growth rate was 3.03 ± 1.18 cm year−1. The diet of the turtles was mainly composed of red algae of the family Gelidiaceae, Gelidiellaceae and Cystocloniaceae. There was a positive relationship between the abundance of red algae and the number of turtle sightings, with a significant increase in foraging activity during late afternoon. This study highlights the importance of this area as a mixed foraging aggregation of juvenile and adult green turtles, and reveals that foraging grounds for this species in Brazil exhibit southern immature-dominated assemblages and northern mixed aggregations. Areas with high aggregation of green turtles comprising individuals from different life stages must be targeted for conservation management.

scholarly journals Hatching and emergence success in green turtle Chelonia mydas nests in the Galápagos Islands

2013 ◽  
Vol 19 (3) ◽  
pp. 217-229 ◽  
Author(s):  
P Zárate ◽  
KA Bjorndal ◽  
M Parra ◽  
PH Dutton ◽  
JA Seminoff ◽  
...  
Keyword(s):  
Green Turtle ◽  
Chelonia Mydas ◽  
Galapagos Islands ◽  
Galápagos Islands ◽  
Emergence Success

Hawksbill turtle (Eretmochelys imbricata Linnaeus 1766) and green turtle (Chelonia mydas Linnaeus 1754) nesting activity (2002-2004) at El Cuyo beach, Mexico

2006 ◽  
Vol 27 (4) ◽  
pp. 539-547 ◽  
Author(s):  
Raquel Xavier ◽  
Andre Barata ◽  
Leopoldo Palomo Cortez ◽  
Nuno Queiroz ◽  
Eduardo Cuevas
Keyword(s):  
Green Turtle ◽  
Average Distance ◽  
Biosphere Reserve ◽  
Chelonia Mydas ◽  
Eretmochelys Imbricata ◽  
Nest Location ◽  
Hurricane Ivan ◽  
Green Turtles ◽  
Nest Site Fidelity ◽  
Nesting Activity

Abstract The Yucatan Peninsula nesting hawksbill turtles' population (Eretmochelys imbricata Linnaeus 1766) is the biggest in the Caribbean and fourth in the world; within the Ría Lagartos Biosphere Reserve, at El Cuyo beach both hawksbill and green turtle (Chelonia mydas Linnaeus 1754) nest. In the present study, the nesting trend and reproductive output of both species during three consecutive nesting seasons (2002-2004) was evaluated. Night patrols from mid April to September allowed the collection of data on number of nests, nest location and size of females. The number of hawksbill and green turtles' nests decreased along these seasons. No differences were found in mean length of female turtles of both species between nesting seasons. Both species showed high nest site fidelity with average distance between nests of 3 km for Hawksbill and 1.8 km for Green turtles. The regression analysis between size and fecundity was significant (p < 0.05) for both species. The spatial variation of laid nests was also analyzed revealing that both species nested mainly on the dune zone. Predation has risen on El Cuyo beach, affecting mostly hawksbills nests. Hurricane Ivan destroyed the majority of green turtles nests in 2004.

Growth Rates of Wild Green Turtles (Chelonia mydas) at a Temperate Foraging Area in the Gulf of California, México

Copeia ◽  
2002 ◽  
Vol 2002 (3) ◽  
pp. 610-617 ◽  
Author(s):  
Jeffrey A. Seminoff ◽  
Antonio Resendiz ◽  
Wallace J. Nichols ◽  
T. Todd Jones
Keyword(s):  
Growth Rates ◽  
Gulf Of California ◽  
Chelonia Mydas ◽  
Green Turtles ◽  
Foraging Area
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