Investigating the effects of nest shading on the green turtle (<i>Chelonia mydas</i>) hatchling phenotype in the Ogasawara islands using a field‐based split clutch experiment

Kobayashi, Shohei; Endo, Daisuke; Kitayama, Chiyo; Ogawa, Ryuta; Arai, Katsuhiko; Watanabe, Gen; Kawaguchi, Maiko

doi:10.1002/jez.2411

Cited by 5 publications

(1 citation statement)

References 27 publications

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“…Besides the measured abiotic factors, other variables such as micro-biological parameters (Patino-Martínez et al, 2012) may explain the developmental changes. Recent split-clutch designs have highlighted the maternal contribution to hatchling body size and self-righting response (Kobayashi et al, 2020;Tezak et al, 2020). This study did not consider the maternal component to privilege normal conditions (i.e., leaving natural nests undisturbed).…”

Section: Impact Of Abiotic Variables On Developmental Responsesmentioning

confidence: 99%

Negative Effects on Neurogenesis, Ovariogenesis, and Fitness in Sea Turtle Hatchlings Associated to ex situ Incubation Management

et al. 2022

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Sea turtle egg relocation and hatchery incubation (hereafter termed ex situ incubation) is an effective strategy to protect clutches when in situ egg incubation is not viable. Nevertheless, it negatively affects the ontogenesis of male gonads and brain areas homologous to the mammalian hippocampus, as well as body size and fitness. Thus, it is imperative to analyze the effects of ex situ incubation on other developmental aspects and extend these observations to females. This work evaluated the effect of ex situ management on neurogenesis (cell proliferation in the dorsal and medial ventricular zones, neuronal integration in the dorsomedial and medial cortices), ovary cell proliferation, body size (mass and length) and self-righting ability. Additionally, this study examined if the incubation microenvironment is different between in situ and ex situ nests and whether it could contribute to explain the biological traits. An analysis of principal components showed differences in biological variables of hatchlings between in situ and ex situ clutches, driven by contrasting temperatures and silt composition. Each biological variable was also analyzed with linear mixed models using in situ vs. ex situ clutches, abiotic variables and their interaction. Turtles from ex situ clutches showed: (1) fewer proliferating cells in the dorsal and medial ventricular zones; (2) less mature neurons in the dorsomedial and medial cortices; (3) ovaries with a lesser number of proliferating cells; (4) lower body mass and length at emergence; and (5) slower self-righting time. Together, the results suggest that ex situ incubation in hatcheries is related to a slowing down of neurogenesis, ovariogenesis, body size and self-righting ability in hatchlings. Future studies should evaluate the effect of ex situ incubation on cognitive and reproductive performance to understand the long-term consequences of altered organogenesis. These studies should also disentangle the differential contribution of egg movement, reburial, nesting environment and parental origin to development. This information would likely result in better conservation strategies for sea turtles.

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Section: Impact Of Abiotic Variables On Developmental Responsesmentioning

confidence: 99%