Sensitivity of turtles to anticoagulant rodenticides: Risk assessment for green sea turtles (Chelonia mydas) in the Ogasawara Islands and comparison of warfarin sensitivity among turtle species

2021 ◽  
Vol 233 ◽  
pp. 105792
Author(s):  
Yoshiya Yamamura ◽  
Kazuki Takeda ◽  
Yusuke K. Kawai ◽  
Yoshinori Ikenaka ◽  
Chiyo Kitayama ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Sea Turtles ◽  
Chelonia Mydas ◽  
Turtle Species ◽  
Green Sea Turtles ◽  
Anticoagulant Rodenticides ◽  
Ogasawara Islands

Infection by and Molecular Features of Learedius learedi (Digenea: Schistosomatoidea) in Green Sea Turtles (Chelonia mydas) on the Ogasawara Islands, Japan

10.1645/19-24 ◽  
2019 ◽  
Vol 105 (4) ◽  
pp. 533
Author(s):  
Chiyo Kitayama ◽  
Kei Hayashi ◽  
Yuma Ohari ◽  
Satomi Kondo ◽  
Toshiro Kuroki ◽  
...  
Keyword(s):  
Sea Turtles ◽  
Chelonia Mydas ◽  
Green Sea Turtles ◽  
Molecular Features ◽  
Ogasawara Islands

scholarly journals Evidence for Host Selectivity and Specialization by Epizoic Chelonibia Barnacles Between Hawksbill and Green Sea Turtles

2021 ◽  
Vol 9 ◽  
Author(s):  
Liberty L. Boyd ◽  
John D. Zardus ◽  
Courtney M. Knauer ◽  
Lawrence D. Wood
Keyword(s):  
Sea Turtles ◽  
Shell Growth ◽  
Chelonia Mydas ◽  
Eretmochelys Imbricata ◽  
Turtle Species ◽  
Green Sea Turtles ◽  
Green Turtles ◽  
Microbial Biofilms ◽  
Host Relationships ◽  
Hawksbill Turtles

Epibionts are organisms that utilize the exterior of other organisms as a living substratum. Many affiliate opportunistically with hosts of different species, but others specialize on particular hosts as obligate associates. We investigated a case of apparent host specificity between two barnacles that are epizoites of sea turtles and illuminate some ecological considerations that may shape their host relationships. The barnacles Chelonibia testudinaria and Chelonibia caretta, though roughly similar in appearance, are separable by distinctions in morphology, genotype, and lifestyle. However, though each is known to colonize both green (Chelonia mydas) and hawksbill (Eretmochelys imbricata) sea turtles, C. testudinaria is >5 times more common on greens, while C. caretta is >300 times more common on hawksbills. Two competing explanations for this asymmetry in barnacle incidence are either that the species’ larvae are spatially segregated in mutually exclusive host-encounter zones or their distributions overlap and the larvae behaviorally select their hosts from a common pool. We indirectly tested the latter by documenting the occurrence of adults of both barnacle species in two locations (SE Florida and Nose Be, Madagascar) where both turtle species co-mingle. For green and hawksbill turtles in both locations (Florida: n = 32 and n = 275, respectively; Madagascar: n = 32 and n = 125, respectively), we found that C. testudinaria occurred on green turtles only (percent occurrence – FL: 38.1%; MD: 6.3%), whereas the barnacle C. caretta was exclusively found on hawksbill turtles (FL: 82.2%; MD: 27.5%). These results support the hypothesis that the larvae of these barnacles differentially select host species from a shared supply. Physio-biochemical differences in host shell material, conspecific chemical cues, external microbial biofilms, and other surface signals may be salient factors in larval selectivity. Alternatively, barnacle presence may vary by host micro-environment. Dissimilarities in scute structure and shell growth between hawksbill and green turtles may promote critical differences in attachment modes observed between these barnacles. In understanding the co-evolution of barnacles and hosts it is key to consider the ecologies of both hosts and epibionts in interpreting associations of chance, choice, and dependence. Further studies are necessary to investigate the population status and settlement spectrum of barnacles inhabiting sea turtles.

scholarly journals Challenges in Evaluating the Severity of Fibropapillomatosis: A Proposal for Objective Index and Score System for Green Sea Turtles (Chelonia mydas) in Brazil

PLoS ONE ◽  
2016 ◽  
Vol 11 (12) ◽  
pp. e0167632 ◽  
Author(s):  
Silmara Rossi ◽  
Angélica María Sánchez-Sarmiento ◽  
Ralph Eric Thijl Vanstreels ◽  
Robson Guimarães dos Santos ◽  
Fabiola Eloisa Setim Prioste ◽  
...  
Keyword(s):  
Sea Turtles ◽  
Chelonia Mydas ◽  
Score System ◽  
Green Sea Turtles

Nonlethal capture of green sea turtles (Chelonia mydas) in fishing weirs as an opportunity for population studies and conservation

2021 ◽  
pp. 105437
Author(s):  
Eduardo H.S.M. Lima ◽  
Danielle Rodrigues Awabdi ◽  
Maria Thereza D. Melo ◽  
Bruno Giffoni ◽  
Leandro Bugoni
Keyword(s):  
Population Studies ◽  
Sea Turtles ◽  
Chelonia Mydas ◽  
Green Sea Turtles

Stress response markers in blood of São Tomé green sea turtles (Chelonia mydas) and their relation to accumulated metal levels

2021 ◽  
pp. 118490
Author(s):  
Inês F.C. Morão ◽  
Marco F.L. Lemos ◽  
Rafael Felix ◽  
Sara Vieira ◽  
Carlos Barata ◽  
...  
Keyword(s):  
Stress Response ◽  
Sea Turtles ◽  
Chelonia Mydas ◽  
Green Sea Turtles ◽  
Metal Levels
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