scholarly journals Effect of nest relocation on the reproductive success of the marine turtle Lepidochelys olivacea (Testudinata: Cheloniidae)

2021 ◽  
Vol 69 (4) ◽  
pp. 1233-1241
Author(s):  
José Luis Sandoval Ramírez ◽  
Elena Solana Arellano ◽  
Rafael Flores Garza ◽  
Pedro Flores Rodríguez ◽  
Sergio García Ibañez ◽  
...  
Keyword(s):  
Reproductive Success ◽  
Marine Turtle ◽  
Lepidochelys Olivacea ◽  
Nest Relocation

Resumen. Introducción: Para incrementar el número de crías de tortugas marinas, es necesario mejorar estrategias de conservación, como incubación de nidos, en condiciones de vivero que contrarresten los efectos de las condiciones climáticas extremas. Objetivo: Comparar cinco parámetros de éxito reproductivo (éxito de eclosión, huevos sin desarrollo, crías muertas, mortalidad embrionaria y período de incubación) de la tortuga marina Lepidochelys olivacea. Métodos: Se evaluó la incubación de nidos bajo dos períodos de relocación de nidos (P1 y P2) bajo condiciones de vivero, en el año 2018 en Guerrero, México. Resultados: Se encontraron diferencias significativas en el éxito de eclosión y la mortalidad embrionaria entre los períodos de reubicación de nidos (P <0.001). En P1, se observaron valores más bajos de éxito de eclosión (77.0 % P1 vs 88.6 % P2) y valores más altos de mortalidad embrionaria (13.7 % P1 vs 3.3 % P2) comparados con los de P2. No se encontraron diferencias entre periodos respecto a los parámetros de huevos sin desarrollo, crías muertas y período de incubación. Conclusiones: las diferencias entre las condiciones ambientales más extremas o calurosas durante el primer período de relocación de nidos parecen afectar el éxito de eclosión y mortalidad embrionaria de L. olivacea. Por lo tanto, es importante tomar medidas al respecto durante esta etapa de incubación.      

scholarly journals Hatchlings of the Marine Turtle Lepidochelys olivacea Display Signs of Prenatal Stress at Emergence after Being Incubated in Man-Made Nests: A Preliminary Report

2017 ◽  
Vol 4 ◽  
Author(s):  
Ma. A. Herrera-Vargas ◽  
Esperanza Meléndez-Herrera ◽  
Gabriel Gutiérrez-Ospina ◽  
Fany E. Bucio-Piña ◽  
Armida Báez-Saldaña ◽  
...  
Keyword(s):  
Prenatal Stress ◽  
Preliminary Report ◽  
Marine Turtle ◽  
Lepidochelys Olivacea

The impacts of climate change on marine turtle reproductive success

2014 ◽  
pp. 287-310 ◽  
Author(s):  
Lucy A. Hawkes ◽  
Annette C. Broderick ◽  
Matthew H. Godfrey ◽  
Brendan J. Godley ◽  
Matthew J. Witt
Keyword(s):  
Climate Change ◽  
Reproductive Success ◽  
Marine Turtle ◽  
Impacts Of Climate Change

Wildlife harvesting, conservation and poverty: the economics of olive ridley egg exploitation

2002 ◽  
Vol 29 (3) ◽  
pp. 375-384 ◽  
Author(s):  
Robert Adrian Hope
Keyword(s):  
Market Price ◽  
Field Research ◽  
Marine Turtle ◽  
Structured Interviews ◽  
Olive Ridley ◽  
Lepidochelys Olivacea ◽  
Government Records ◽  
Price Analysis ◽  
Open Access Resource ◽  
Access Resource

Eggs of the olive ridley marine turtle (Lepidochelys olivacea) have been harvested by generations of Pacific coast communities in Central America for both economic and nutritional reasons. There has been little economic analysis that has identified possible points of improvements for management of the resource. Three egg harvesting projects were studied in Costa Rica and Nicaragua. Field research using semi-structured interviews with stakeholders and key informants were undertaken in June and July 2000. Market price data were collected from harvesters, points of sale and government records. Spread price analysis suggested that more flexible seasonal and regional pricing policies might increase egg profits. Contested property rights have weakened incentives to manage the species as an asset rather than an open access resource. Transaction costs have reduced community efficiency in egg marketing. Community egg marketing cartels with authorized urban selling points are recommended to improve resource management, appropriate a higher egg profit margin and clarify the harvesting origin of eggs for consumers.

scholarly journals Recent advances on the estimation of the thermal reaction norm for sex ratios

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8451 ◽  
Author(s):  
F. Alberto Abreu-Grobois ◽  
B. Alejandra Morales-Mérida ◽  
Catherine E. Hart ◽  
Jean-Michel Guillon ◽  
Matthew H. Godfrey ◽  
...  
Keyword(s):  
Incubation Temperature ◽  
Climate Change Impacts ◽  
Reaction Norm ◽  
Thermal Reaction ◽  
Marine Turtle ◽  
Lepidochelys Olivacea ◽  
Incubation Experiments ◽  
Asymmetrical Pattern ◽  
Widespread Phenomenon ◽  
The Relationship

Temperature-dependent sex determination, or TSD, is a widespread phenomenon in reptiles. The shape of the relationship between constant incubation temperature and sex ratio defines the TSD pattern. The TSD pattern is considered a life-history parameter important for conservation because the wider the range of temperatures producing both sexes, the more resilient the species is to climate change impacts. We review the different published equations and methodologies that have been used to model TSD patterns. We describe a new flexible model that allows for an asymmetrical pattern around the pivotal temperature, which is the constant temperature producing both sexes in equal proportions. We show that Metropolis-Hastings with Markov chain produced by a Monte Carlo process has many advantages compared to maximum likelihood and is preferred. Finally, we apply the models to results from incubation experiments using eggs from the marine turtle Lepidochelys olivacea originating in Northeast Indian, East Pacific, and West Atlantic Regional Management Units (RMUs) and find large differences in pivotal temperatures but not in transitional ranges of temperatures.

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