2021
DOI: 10.3390/ani11113168
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Hatching Success Rather Than Temperature-Dependent Sex Determination as the Main Driver of Olive Ridley (Lepidochelys olivacea) Nesting Activity in the Pacific Coast of Central America

Abstract: In marine turtles, sex is determined during a precise period during incubation: males are produced at lower temperatures and females at higher temperatures, a phenomenon called temperature-dependent sex determination. Nest temperature depends on many factors, including solar radiation. Albedo is the measure of the proportion of reflected solar radiation, and in terms of sand color, black sand absorbs the most energy, while white sand reflects more solar radiation. Based on this observation, darker sand beaches… Show more

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Cited by 10 publications
(6 citation statements)
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“…Sea turtles exhibit temperature-dependent sex determination, which is characterized by the exclusive production of a single sex below (male) or above (female) a transitional range of temperatures that can vary among sea turtle species (Ackerman 1997 ; Porter et al 2021 ; Wibbels 2003 ; Wibbels et al 1998 ), as well as a pivotal temperature that produces a sex ratio of 1:1 (Mrosovsky and Yntema 1980 ). Mean nest incubation temperature at Corozalito (32.3 °C) was higher than the estimated sex determination pivotal temperature for olive ridleys (30.5 °C) in the ETP (Wibbels et al 1998 ; Wibbels 2007 ; Morales Mérida et al 2021 ) and below the lethal temperature (35 °C) documented at Ostional (Valverde et al 2010 ). The absence of rainfall during 2021 likely led to the high incubation temperatures recorded during the study period, as rainfall causes sand and nest temperatures to drop for several days (Laloë et al 2021 ; Porter et al 2021 ).…”
Section: Discussionmentioning
confidence: 76%
See 1 more Smart Citation
“…Sea turtles exhibit temperature-dependent sex determination, which is characterized by the exclusive production of a single sex below (male) or above (female) a transitional range of temperatures that can vary among sea turtle species (Ackerman 1997 ; Porter et al 2021 ; Wibbels 2003 ; Wibbels et al 1998 ), as well as a pivotal temperature that produces a sex ratio of 1:1 (Mrosovsky and Yntema 1980 ). Mean nest incubation temperature at Corozalito (32.3 °C) was higher than the estimated sex determination pivotal temperature for olive ridleys (30.5 °C) in the ETP (Wibbels et al 1998 ; Wibbels 2007 ; Morales Mérida et al 2021 ) and below the lethal temperature (35 °C) documented at Ostional (Valverde et al 2010 ). The absence of rainfall during 2021 likely led to the high incubation temperatures recorded during the study period, as rainfall causes sand and nest temperatures to drop for several days (Laloë et al 2021 ; Porter et al 2021 ).…”
Section: Discussionmentioning
confidence: 76%
“…The preponderant theoretical production of females at Corozalito may contribute to an increase in the number of nesting olive ridleys in the region, which may eventually contribute to an increase in the size of arribadas at this and other nesting sites. However, it is important to consider the effect the variation of temperatures during the incubation period could have on hatchling rates (Morales Mérida et al 2021 ) and recruitment to mass nesting events (Wibbels 2007 ). Further research is needed at Corozalito to assess incubation temperature in olive ridley turtles during several seasons and compare them with larger nesting beaches such Ostional, Nancite, or La Flor, to understand the development of this nesting beach over time.…”
Section: Discussionmentioning
confidence: 99%
“…Since direct measurements of sex ratios are fatal, an alternative is to estimate hatchling sex ratios using temperature-based models [55]. At sites where long-term measurements of sex ratios are not available, indications of warming might still be evident since very female-biased hatching sex ratios are accompanied by high in-nest embryo mortality [19,56] and lower hatchling quality [57][58][59]. Consequently, simple measures such as hatchling success (the proportion of eggs developing into hatchlings) may provide an alert to feminization that could then be substantiated by targeted measurements of hatchling sex ratios.…”
Section: Discussionmentioning
confidence: 99%
“…Females are produced at warmer incubation temperatures [16], and so there is concern that climate warming might cause the production of highly female-skewed hatchling cohorts, which could ultimately lead to population extinction [6,17]. In addition, lower hatch success at high incubation temperatures threatens population survival [18][19][20]. Currently across species, most sea turtle nesting beaches around the globe produce hatchling sex ratios that are already heavily female-biased [21].…”
Section: Introductionmentioning
confidence: 99%
“…For East Pacific olive ridleys, the recorded pivotal temperature is 30.24°C (95% credible interval 30. 04-30.50;Morales-Mérida et al, 2021). However, under most future climate scenarios, it is likely that natural incubation conditions will change dramatically due to increased air and sea temperatures, sea-level rise, changes in rain patterns, and the frequency and intensity of storms (Patrício et al, 2019).…”
mentioning
confidence: 99%