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"Green turtle"
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Saving the endangered green sea turtle
Presents facts about the green sea turtles biology, habitat, mating and nesting habits, and diet, before describing the harmful human behavior that threatens its very existence.
Book
Identifying genetic lineages through shape: An example in a cosmopolitan marine turtle species using geometric morphometrics
Investigates the carapace shape of the green turtle (Chelonia mydas) from individuals of Atlantic, Eastern Pacific, and Western Pacific genetic lineages using geometric morphometrics to evaluate congruence (similarity) between external morphology (e.g. carapace length, carapace scute pattern, flipper size, skull morphology) and species’ phylogeography (geographic distributions of individuals). Assesses the variation of carapace shape according to foraging grounds. Notes the study area for New Zealand encompassed the inshore waters of North Island, extending from Cape Reinga (34.41˚S, 174.66˚E) south to Opotiki, in the Bay of Plenty (37.98˚S,177.28˚E). Source: National Library of New Zealand Te Puna Matauranga o Aotearoa, licensed by the Department of Internal Affairs for re-use under the Creative Commons Attribution 3.0 New Zealand Licence.
Journal Article
The secret life of a sea turtle
\"Follow the exciting and sometimes perilous life of a sea turtle in this robust nonfiction tale by sea turtle expert Maddalena Bearzi and illustrated by Alex Boersma\"-- Provided by publisher.
BOOK
Correction: Trace element concentrations in forage seagrass species of Chelonia mydas along the Great Barrier Reef
[This corrects the article DOI: 10.1371/journal.pone.0269806.].[This corrects the article DOI: 10.1371/journal.pone.0269806.].
Journal Article
Rates of Sediment Resuspension and Erosion Following Green Turtle Grazing in a Shallow Caribbean Thalassia testudinum Meadow
Seagrass meadows buffer sediments against resuspension and erosion by reducing water velocity and attenuating wave energy, thereby promoting accumulation of sediment and associated carbon. Grazing by green turtles (Chelonia mydas) can significantly reduce the aboveground canopy in meadows. Increasing green turtle population sizes will return more seagrass areas to a naturally grazed state; however, it is not well understood how green turtle grazing will affect sediment processes in seagrass meadows. To evaluate effects of grazing, we measured sediment erosion following a clipping experiment in a shallow Caribbean Thalassia testudinum seagrass meadow and rates of sediment resuspension in an area naturally grazed by turtles. Following removal of the seagrass canopy, erosion of surface sediments did not increase compared to unclipped reference plots during the clipping experiment. We provide the first estimates of particle deposition and resuspension rates from a seagrass meadow grazed by green turtles. Rates did not differ between areas naturally grazed for at least one year and ungrazed areas. On average, 51% of the total sediment flux was comprised of resuspended sediments in the area grazed by turtles, and 52% in the ungrazed area of the meadow. Green turtle grazing also did not affect the carbon content of sediment particles or the downward carbon flux in the meadow. Our results demonstrate that grazing did not increase the vulnerability of surface sediments to loss in this system, and as green turtles recover, their natural grazing regime may not directly affect sediment processes contributing to carbon accumulation in shallow, coastal meadows.
Journal Article
Intra-specific variation in skull morphology of juvenile Chelonia mydas in the southwestern Atlantic Ocean
The genetic diversity and skull morphology of juvenile Chelonia mydas recruited to the southwestern Atlantic were evaluated to quantify intraspecific variation in the skull shape and size related to (1) broad geographic origin and (2) age (within the most abundant haplotype). 155 C. mydas stranded at 25o S in Brazil were sampled, with 108 assessed for haplotypes (mtDNA) and 102 aged. The hypothesis of no effects of intrinsic variables on the morphology of three skull views was evaluated via 2D geometric morphometrics. Mixed stock analyses identified ten haplotypes among 12 nesting sites, with Ascension Island dominant (65%), then Suriname (10%) and Sao Tome (9%). Compared to CM-A8 (southern Atlantic and west African haplotype) individuals, those assessed as CM-A5 (northern Atlantic and southern Caribbean haplotype) consistently had different skull shapes, which might affect physiology and behaviour. Within CM-A8, there was a positive relationship between centroid size and age (3–5 years), and differences in ventral shape, possibly attributed to ontogenetic diet shifts. The clear morphological differences between haplotypes could imply evolutionary consequences for genetic diversity and trophic polymorphism if there is increased future bias towards CM-A8 (owing to fewer anthropogenic impacts during/post hatching). Conserving priority Caribbean nesting grounds during regional management initiatives might protect phenotypic variability and ultimately population diversity and resilience.
Journal Article
Characterisation of the Gastrointestinal Microbiome of Green Sea Turtles (Chelonia mydas): A Systematic Review
The gut microbiome of sea turtles is essential for their ecological resilience and adaptation to environmental stressors. We hypothesised that different gut microbial profiles existed between green sea turtles kept in captivity and those in the wild. The aim of this systematic review was to determine dominant bacterial phyla in the gut microbiomes of wild and captive green sea turtles. Comparison of the top four bacterial phyla revealed that Bacillota was the most abundant phylum in captive turtles (40.9–87.5%), but it only ranked second (3.5–57.8%) in wild turtles. Bacteroidota had comparable relative abundance in captive (8.7–45.6%) and wild (3.6–43.1%) populations. By contrast, the relative abundance of Pseudomonadota was higher in wild turtles (6.2–68.1%) compared to the captive population (0.1–6.6%). Verrucomicrobiota was less prevalent in wild and captive populations, with relative abundances ranging from 0.28 to 5.4% and 2.3 to 7.2%, respectively. These findings highlight a putative gut microbial shift between wild and captive green sea turtle populations. This shift may be shaped by variations in environmental factors in captivity or the wild. Nonetheless, the significance of these putative changes is still unknown; the potential to use microbial shifts to guide management, rehabilitation, and conservation of green sea turtles is promising, but remains limited.
Journal Article
