Long-term changes in body size of green turtles nesting on Trindade Island, Brazil: Signs of recovery?

Pereira, Josiele Alves; Martins, Agnaldo Silva; Seminoff, Jeffrey A.; Mazzuco, Ana Carolina de Azevedo

doi:10.1016/j.marenvres.2023.105930

Cited by 2 publications

(3 citation statements)

References 53 publications

(62 reference statements)

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“…We found predation studies at 34 sites for all sea turtle species, including green, loggerhead (Caretta caretta); olive ridley (Lepidochelys olivacea), hawksbill (Eretmochelys imbricata), flatback (Natator depressus), leatherback (Dermochelys coriacea), and Kemp's ridley (Lepidochelys kempii) turtles. Thirty-six predator species were identified, eight of which were identified as invasive, including feral pigs, Sus scrofa (Pereira et al 2023); red foxes (Lei and Booth 2017b); armadillo, Dasypus novemcinctus (Engeman et al 2006); Asian mongoose Herpestes javanicus (Leighton et al 2011), and rats (present study). Depending on the site location, a predator could be classed as invasive or native (e.g., dogs and coyotes).…”

Section: Predators Of Sea Turtle Nests Around the Worldmentioning

confidence: 76%

“…Predator eradication is certainly an option where predators are an introduced species. For example, introduced feral pigs historically decimated green turtle nests on Trindade Island, Brazil and pig removal has led to recovery of nesting numbers (Pereira et al 2023). Similarly, on Keewaydin Island, Florida, pig eradication resulted in a decrease from 87% to just 1% of nests destroyed by this invasive predator (Engeman et al 2019).…”

Section: Discussionmentioning

confidence: 99%

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Predation of sea turtle eggs by rats and crabs

Stokes,

Esteban,

Hays

2023

Mar Biol

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Egg predation by invasive and native species may have severe impacts on endangered species and negatively affect species recovery. We assessed the levels of egg predation within green turtle (Chelonia mydas) clutches on the island of Diego Garcia (7.42°S, 72.45°E), Chagos Archipelago (Indian Ocean). Native coconut crabs (Birgus latro) and ghost crabs (Ocypode spp.), as well as introduced black rats (Rattus rattus), were predators of eggs, with these species entering nests via tunnels dug obliquely in the sand. Often whole eggs were removed from clutches. For example, the mean clutch size at oviposition (mean 127.8 eggs, n = 23, range = 74–176) was significantly larger than at the end of incubation (mean 110.9 hatched and unhatched eggs, n = 16, range = 9–147). In other cases, egg predation was recorded where the egg had been opened and contents were eaten in the nest. Overall, hatching success (the percentage of eggs laid leading to a hatchling emerging from the egg) was 64.9%, while 3.1% of eggs were predated within nests, 18.1% died during incubation without predation and 13.9% were removed. We reviewed evidence from 34 sites around the world identifying 36 predators that were either native (e.g., crabs, and goannas, n = 30) or invasive (e.g., rats, and pigs, n = 8). Depending on location, a predator could be identified as both native and invasive (e.g., dogs). We discuss how either nest protection and/or invasive predator eradication may be used to increase egg survival and when these approaches might be used.

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Section: Predators Of Sea Turtle Nests Around the Worldmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Predation of sea turtle eggs by rats and crabs

Stokes,

Esteban,

Hays

2023

Mar Biol

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“…Here we found that the size of the aggregation has been relatively constant from 2011 to 2019. Recently, decrease in the size of nesting green turtles has been reported from several nesting sites, possibly due to increase in the neophyte nesters [45][46][47]. However, significant decrease in the CCL of foraging green turtles in the Brunei Bay was not supported.…”

Section: Discussionmentioning

confidence: 99%

Health status and genetic compositions of green turtles (Chelonia mydas) foraging in Brunei Bay

Joseph,

Nishizawa,

Jalimin

et al. 2023

PLoS ONE

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Long-term monitoring of sea turtle aggregations is critical for understanding the impacts of environmental changes on their population health and habitat suitability. Brunei Bay is a significant foraging ground for green turtles in the South China Sea. We analyzed the body size, hematology and body condition of green turtles for their health status in their foraging ground in Brunei Bay over a period of nine years (2011–2019). Additionally, we used mitochondrial DNA (mtDNA) to evaluate changes in the size and genetic composition of green turtle aggregations. Our findings revealed that the size composition of the green turtle population varied seasonally, but there were no significant temporal changes in genetic and size compositions. Hematology parameters and Fulton’s body condition index were consistent with those reported for apparently healthy green turtles. Furthermore, we found that blood reference intervals indicated the turtles were healthy. These results provide valuable baseline data for future comparisons with other foraging aggregations and for long-term monitoring of green turtles in Brunei Bay.

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Long-term changes in body size of green turtles nesting on Trindade Island, Brazil: Signs of recovery?

Cited by 2 publications

References 53 publications

Predation of sea turtle eggs by rats and crabs

Predation of sea turtle eggs by rats and crabs

Health status and genetic compositions of green turtles (Chelonia mydas) foraging in Brunei Bay

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