scholarly journals Migration Paths of the Adult Female and Male Loggerhead Turtles Caretta caretta Determined through Satellite Telemetry

1997 ◽  
Vol 63 (4) ◽  
pp. 547-552 ◽  
Author(s):  
Wataru Sakamoto ◽  
Takeharu Bando ◽  
Nobuaki Arai ◽  
Norihisa Baba
Keyword(s):  
Adult Female ◽  
Satellite Telemetry ◽  
Caretta Caretta ◽  
Loggerhead Turtles

Distribution of foraging habitats of male loggerhead turtles (Caretta caretta) as revealed by stable isotopes and satellite telemetry

2012 ◽  
Vol 159 (6) ◽  
pp. 1255-1267 ◽  
Author(s):  
Mariela Pajuelo ◽  
Karen A. Bjorndal ◽  
Kimberly J. Reich ◽  
Michael D. Arendt ◽  
Alan B. Bolten
Keyword(s):  
Stable Isotopes ◽  
Satellite Telemetry ◽  
Caretta Caretta ◽  
Loggerhead Turtles

Movements of loggerhead sea turtles (Caretta caretta) in the Gulf of California: integrating satellite telemetry and remotely sensed environmental variables

2020 ◽  
Vol 100 (5) ◽  
pp. 817-824
Author(s):  
Alejandra G. Sandoval-Lugo ◽  
T. Leticia Espinosa-Carreón ◽  
Jeffrey A. Seminoff ◽  
Catherine E. Hart ◽  
César P. Ley-Quiñónez ◽  
...  
Keyword(s):  
North Pacific ◽  
Gulf Of California ◽  
Satellite Telemetry ◽  
Loggerhead Turtle ◽  
Caretta Caretta ◽  
Environmental Variable ◽  
Satellite Tracking ◽  
Mexican Pacific ◽  
The North ◽  
Loggerhead Turtles

AbstractThe loggerhead turtle (Caretta caretta) is a circumglobal species and is listed as vulnerable globally. The North Pacific population nests in Japan and migrates to the Central North Pacific and Pacific coast of North America to feed. In the Mexican Pacific, records of loggerhead presence are largely restricted to the Gulf of Ulloa along the Baja California Peninsula, where very high fisheries by-catch mortality has been reported. Records of loggerhead turtles within the Sea of Cortez also known as the Gulf of California (GC) exist; however, their ecology in this region is poorly understood. We used satellite tracking and an environmental variable analysis (chlorophyll-a (Chl-a) and sea surface temperature (SST)) to determine movements and habitat use of five juvenile loggerhead turtles ranging in straight carapace length from 62.7–68.3 cm (mean: 66.7 ± 2.3 cm). Satellite tracking durations ranged from 73–293 days (mean: 149 ± 62.5 days), transmissions per turtle from 14–1006 (mean: 462 ± 379.5 transmissions) and total travel distance from 1237–5222 km (mean: 3118 ± 1490.7 km). We used travel rate analyses to identify five foraging areas in the GC, which occurred mainly in waters from 10–80 m deep, with mean Chl-a concentrations ranging from 0.28–13.14 mg m−3 and SST ranging from 27.8–34.4°C. This is the first study to describe loggerhead movements in the Gulf of California and our data suggest that loggerhead foraging movements are performed in areas with eutrophic levels of Chl-a.

scholarly journals Epibionts Reflect Spatial and Foraging Ecology of Gulf of Mexico Loggerhead Turtles (Caretta caretta)

2021 ◽  
Vol 9 ◽  
Author(s):  
Ian Silver-Gorges ◽  
Jeroen Ingels ◽  
Giovanni A. P. dos Santos ◽  
Yirina Valdes ◽  
Leticia P. Pontes ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Gulf Of Mexico ◽  
Habitat Use ◽  
Spatial Ecology ◽  
Foraging Ecology ◽  
Satellite Telemetry ◽  
Caretta Caretta ◽  
Sea Turtle ◽  
Loggerhead Turtles ◽  
Nesting Beaches

Sea turtles are exposed to numerous threats during migrations to their foraging grounds and at those locations. Therefore, information on sea turtle foraging and spatial ecology can guide conservation initiatives, yet it is difficult to directly observe migrating or foraging turtles. To gain insights into the foraging and spatial ecology of turtles, studies have increasingly analyzed epibionts of nesting turtles, as epibionts must overlap spatially and ecologically with their hosts to colonize successfully. Epibiont analysis may be integrated with stable isotope information to identify taxa that can serve as indicators of sea turtle foraging and spatial ecology, but few studies have pursued this. To determine if epibionts can serve as indicators of foraging and spatial ecology of loggerhead turtles nesting in the northern Gulf of Mexico we combined turtle stable isotope and taxonomic epibiont analysis. We sampled 22 individual turtles and identified over 120,000 epibiont individuals, belonging to 34 macrofauna taxa (>1 mm) and 22 meiofauna taxa (63 μm–1 mm), including 111 nematode genera. We quantified epidermis δ13C and δ15N, and used these to assign loggerhead turtles to broad foraging regions. The abundance and presence of macrofauna and nematodes did not differ between inferred foraging regions, but the presence of select meiofauna taxa differentiated between three inferred foraging regions. Further, dissimilarities in macrofauna, meiofauna, and nematode assemblages corresponded to dissimilarities in individual stable isotope values within inferred foraging regions. This suggests that certain epibiont taxa may be indicative of foraging regions used by loggerhead turtles in the Gulf of Mexico, and of individual turtle foraging and habitat use specialization within foraging regions. Continued sampling of epibionts at nesting beaches and foraging grounds in the Gulf of Mexico and globally, coupled with satellite telemetry and/or dietary studies, can expand upon our findings to develop epibionts as efficient indicators of sea turtle foraging and spatial ecology.

Nest placement by loggerhead turtles, Caretta caretta

1993 ◽  
Vol 45 (1) ◽  
pp. 47-53 ◽  
Author(s):  
Graeme C. Hays ◽  
John R. Speakman
Keyword(s):  
Caretta Caretta ◽  
Nest Placement ◽  
Loggerhead Turtles

scholarly journals Helminth communities of loggerhead turtles (Caretta caretta) from Central and Western Mediterranean Sea: The importance of host's ontogeny

2010 ◽  
Vol 59 (3) ◽  
pp. 367-375 ◽  
Author(s):  
Mario Santoro ◽  
Francisco J. Badillo ◽  
Simonetta Mattiucci ◽  
Giuseppe Nascetti ◽  
Flegra Bentivegna ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Caretta Caretta ◽  
Western Mediterranean ◽  
Western Mediterranean Sea ◽  
Helminth Communities ◽  
Loggerhead Turtles
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