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The use of mesoscale eddies by juvenile loggerhead sea turtles (Caretta caretta)
in the southwestern Atlantic
#MMPMID28249020
Gaube P
; Barceló C
; McGillicuddy DJ Jr
; Domingo A
; Miller P
; Giffoni B
; Marcovaldi N
; Swimmer Y
PLoS One
2017[]; 12
(3
): e0172839
PMID28249020
show ga
Marine animals, such as turtles, seabirds and pelagic fishes, are observed to
travel and congregate around eddies in the open ocean. Mesoscale eddies, large
swirling ocean vortices with radius scales of approximately 50-100 km, provide
environmental variability that can structure these populations. In this study, we
investigate the use of mesoscale eddies by 24 individual juvenile loggerhead sea
turtles (Caretta caretta) in the Brazil-Malvinas Confluence region. The influence
of eddies on turtles is assessed by collocating the turtle trajectories to the
tracks of mesoscale eddies identified in maps of sea level anomaly. Juvenile
loggerhead sea turtles are significantly more likely to be located in the
interiors of anticyclones in this region. The distribution of surface drifters in
eddy interiors reveals no significant association with the interiors of cyclones
or anticyclones, suggesting higher prevalence of turtles in anticyclones is a
result of their behavior. In the southern portion of the Brazil-Malvinas
Confluence region, turtle swimming speed is significantly slower in the interiors
of anticyclones, when compared to the periphery, suggesting that these turtles
are possibly feeding on prey items associated with anomalously low near-surface
chlorophyll concentrations observed in those features.
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