Results 171 to 180 of about 4,847 (216)

Lunar phases and hawksbill sea turtle nesting

Journal of Ethology, 2019
The behavior of sea turtle species can be influenced by the lunar cycle, possibly due to moonlight variability. We analyzed the relationship between nesting behavior and moon phase using nesting hawksbill turtle records for beaches in Northeast Brazil for the 2006–2007 to 2015–2016 seasons.
Milena Felix Nakamura, Armando José Barsante Santos, Bruno Lobão-Soares, Gilberto Corso   +3 more
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Signals of Vitellogenesis and Estrus in Female Hawksbill Turtles

Zoological Science, 2015
This study reports a viable means of identifying the vitellogenic cycle and limited estrus period in hawksbill turtles for the purposes of developing captive breeding program, based on the combination of blood metabolite parameters (triglyceride, total protein, and calcium levels), feeding status, and ovary condition. Follicle size of two focal captive
Isao, Kawazu, Masakatsu, Kino, Makio, Yanagisawa, Konomi, Maeda, Ken, Nakada, Yasuhiro, Yamaguchi, Yutaka, Sawamukai   +6 more
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Hawksbill Sea Turtles in the Northwestern Hawaiian Islands

Chelonian Conservation and Biology, 2012
Abstract This study reports observations of Hawksbill sea turtles (Eretmochelys imbricata) in the Northwestern Hawaiian Islands, a remote and protected expanse of coral atolls considered outside the species range. Since no direct monitoring efforts exist, we synthesized records from historical accounts, opportunistic sightings, and internet ...
Kyle S. Van Houtan, John N. Kittinger, Amanda L. Lawrence, Chad Yoshinaga, V. Ray Born, Adam Fox   +5 more
openaire   +1 more source

Spongivory in Hawksbill Turtles: A Diet of Glass

Science, 1988
The hawksbill ( Eretmochelys imbricata ), an endangered marine turtle associated with coral reefs throughout the tropics, feeds almost exclusively on sponges in the Caribbean, and possibly throughout its range. It is one of fewer than a dozen vertebrates that are known to specialize on this widely distributed but ...
openaire   +2 more sources

Deforestation: Risk Of Sex Ratio Distortion In Hawksbill Sea Turtles

Ecological Applications, 2006
Phenotypic sex in sea turtles is determined by nest incubation temperatures, with warmer temperatures producing females and cooler temperatures producing males. The common finding of highly skewed female-biased hatchling sex ratios in sea turtle populations could have serious repercussions for the long-term survival of these species and prompted us to ...
Stephanie Jill, Kamel, N, Mrosovsky
openaire   +2 more sources

Hawksbill Turtle: Endangered Species Act Five Year Review

2020
NCRL subject guide 2020 ...
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Gonadal Morphology of Stillborn Hawksbill Sea Turtle (Eretmochelys imbricata) Hatchlings

Microscopy and Microanalysis
Abstract This study aimed to investigate sexual dimorphism in stillborn hawksbill sea turtles (Eretmochelys imbricata) through gonadal morphological characterizations. Macroscopic, light microscopy, and transmission electron analyses were performed for 30 gonad-mesonephros complexes.
Emanuel Lucas Bezerra Rocha, Lucas Gabriel Verissimo Pinheiro da Silva, Isadora Natália Rocha Barreto, Marcela dos Santos Magalhães, Lucas Castanhola Dias, Radan Elvis Matias de Oliveira, Janine Karla França da Silva Braz, Moacir Franco de Oliveira, Carlos Eduardo Bezerra de Moura   +8 more
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Hawksbill turtle Eretmochelys imbricata in the sultanate of Oman

Biological Conservation, 1981
Abstract The preence of a population of hawksbill turtle Eretmochelys imbricata nesting on Masirah island, lat. 21°N, long. 59°E, is reported. A maximum of 124 adult females nested in 1978 and 109 in 1979. Details of adult size and clutch sizes are given.
openaire   +1 more source

Diverse migratory strategies for a hawksbill sea turtle population

Aquatic Conservation: Marine and Freshwater Ecosystems
Abstract Outside of short, infrequent visits to reproductive habitats, sea turtle lifespans are largely spent in foraging areas. Supporting imperilled populations in an era of biodiversity declines and environmental change requires improvements in the understanding of foraging distributions, plus the migratory corridors that connect foraging and ...
Andrew S. Maurer, Jeffrey A. Seminoff, Martha O. Burford Reiskind, Seth P. Stapleton   +3 more
openaire   +1 more source

The Carapacial Scutes of hawksbill turtles (Eretmochelys imbricata)

2007
The primary objective of the research reported here was to decipher information on the relationship between size and age from the keratin plates of the carapace of hawksbill turtles, Eretmochelys imbricata. This required a detailed description of the development and differentiation of the keratin plates, and the formulation of a morphological model ...
openaire   +1 more source