scholarly journals Size-related differences in feeding habitat use of adult female loggerhead turtles Caretta caretta around Japan determined by stable isotope analyses and satellite telemetry

2002 ◽  
Vol 233 ◽  
pp. 273-281 ◽  
Author(s):  
H Hatase ◽  
N Takai ◽  
Y Matsuzawa ◽  
W Sakamoto ◽  
K Omuta ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Habitat Use ◽  
Adult Female ◽  
Satellite Telemetry ◽  
Caretta Caretta ◽  
Stable Isotope Analyses ◽  
Loggerhead Turtles ◽  
Feeding Habitat ◽  
Isotope Analyses

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.

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

Further Evidence for Site Fidelity to Wing Molt Locations by King Eiders: Integrating Stable Isotope Analyses and Satellite Telemetry

Waterbirds ◽  
2007 ◽  
Vol 30 (1) ◽  
pp. 52-57 ◽  
Author(s):  
Michael J. Knoche ◽  
Abby N. Powell ◽  
Lori T. Quakenbush ◽  
Matthew J. Wooller ◽  
Laura M. Phillips
Keyword(s):  
Stable Isotope ◽  
Site Fidelity ◽  
Satellite Telemetry ◽  
Stable Isotope Analyses ◽  
Isotope Analyses

scholarly journals Bulk tissue and amino acid stable isotope analyses reveal global ontogenetic patterns in ocean sunfish trophic ecology and habitat use

2020 ◽  
Vol 633 ◽  
pp. 127-140 ◽  
Author(s):  
ND Phillips ◽  
EA Elliott Smith ◽  
SD Newsome ◽  
JDR Houghton ◽  
CD Carson ◽  
...  
Keyword(s):  
Amino Acid ◽  
Stable Isotope ◽  
Habitat Use ◽  
Trophic Ecology ◽  
Stable Isotope Analyses ◽  
Ocean Sunfish ◽  
Acid Stable ◽  
Bulk Tissue ◽  
Isotope Analyses

Intraspecific comparison of diet of California sea lions (Zalophus californianus) assessed using fecal and stable isotope analyses

2011 ◽  
Vol 89 (2) ◽  
pp. 109-122 ◽  
Author(s):  
A. J. Orr ◽  
G. R. VanBlaricom ◽  
R. L. DeLong ◽  
V. H. Cruz-Escalona ◽  
S. D. Newsome
Keyword(s):  
Stable Isotope ◽  
Adult Female ◽  
Age Groups ◽  
Zalophus Californianus ◽  
California Sea Lions ◽  
Stable Isotope Analyses ◽  
Merluccius Productus ◽  
Sea Lions ◽  
Adult Females ◽  
Isotope Analyses

The diet of juvenile and adult female California sea lions ( Zalophus californianus (Lesson, 1828)) at San Miguel Island, California, was estimated and compared using fecal and stable isotope analyses to determine dietary differences by age. Fecal samples were collected during 2002–2006 and prey remains were identified. Stable carbon (δ13C) and stable nitrogen (δ15N) isotope values were determined from plasma and fur obtained from yearlings, 2- to 3-year-old juveniles, and adult females during 2005 and 2006. Juveniles ate more than 15 prey taxa, whereas adult females consumed more than 33 taxa. Relative importance of prey was determined using percent frequency of occurrence (%FO). Engraulis mordax Girard, 1854, Sardinops sagax (Jenyns, 1842), Merluccius productus (Ayres, 1855), genus Sebastes Cuvier, 1829, and Loligo opalescens Berry, 1911 were the most frequently occurring (%FO > 10%) prey in the feces of both juvenile and adult female sea lions, although their importance varied between age groups. Only yearlings had significantly different isotopic values than older conspecifics, indicating that older juveniles were feeding at a similar trophic level and in similar habitats as adult females. Whereas each method had biases, combining the two provided a better understanding of the diet of California sea lions and intraspecific differences.

Analytical pyrolysis and stable isotope analyses reveal past environmental changes in coralloid speleothems from Easter Island (Chile)

2016 ◽  
Vol 1461 ◽  
pp. 144-152 ◽  
Author(s):  
Ana Z. Miller ◽  
José M. De la Rosa ◽  
Nicasio T. Jiménez-Morillo ◽  
Manuel F.C. Pereira ◽  
José A González-Pérez ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Environmental Changes ◽  
Easter Island ◽  
Analytical Pyrolysis ◽  
Stable Isotope Analyses ◽  
Isotope Analyses
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