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Effects of high temperature on reproductive characteristics and hormones of female Eriocheir sinensis during reproduction (Brachyura, Varunidae)

In: Crustaceana
Authors:
Chenchen Shen East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, P.R. China
College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, P.R. China

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https://orcid.org/0000-0003-1244-8526
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Guangpeng Feng East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, P.R. China
College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, P.R. China
Jiangxi Institute for Fisheries Sciences, Poyang Lake Fisheries Research Centre of Jiangxi, Nanchang 330039, P.R. China

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https://orcid.org/0000-0002-8397-5123
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Jianyi Liu East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, P.R. China

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Xiaorong Huang East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, P.R. China

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Haihua Wang East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, P.R. China

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Abstract

Under the influence of global warming, excessive temperatures may affect adult female Eriocheir sinensis at a sensitive stage, changing the reproductive process, which is critical for the persistence of populations. Thus, the effects of high temperature on the reproductive performances and hormone changes of female E. sinensis were analysed. The results showed that the mating and spawning rates were maintained at >80% at 10–25°C and at 10–15°C, respectively. However, the spawning rate was only 16.67 ± 40.82% at 25°C. It is inferred that the spawning behaviour is more affected by high temperature, and 25°C had an adverse effect on the spawning rate. The reproductive performances (egg production, fecundity and reproductive index) of female crabs at 15°C were better than in other temperature groups. Meanwhile, the levels of DHP (17α,20β-dihydroxy-4-pregnene-3-one) and E2 (estradiol-17β) decreased at 25°C after spawning, indicating that 25°C might restrain the synthesis of sex hormone, which may lead to a inferior spawning rate. The results can provide a reference for the reproductive performances of female E. sinensis under high temperatures, which is conducive to the protection of E. sinensis under global warming.

Résumé

Sous l’influence du changement climatique, des températures excessives peuvent affecter les femelles d’Eriocheir sinensis à certains stades sensibles modifiant le processus de reproduction, essentiel pour la persistance de l’espèce. Ainsi, les effets de températures élevées sur les performances de la reproduction et les changements hormonaux chez les femelles d’E. sinensis ont été analysés. Les résultats ont montré que l’accouplement et la ponte ont été maintenus > 80% à 10-25°C et à 10-15°C. Cependant le taux de ponte a été seulement de 16,67 ± 40,82% à 25°C. On en déduit que le comportement de ponte est plus affecté par les températures élevées et que 25°C a un effet négatif sur le taux de ponte. Les performances de reproduction (production d’œufs, fécondité et index de reproduction) des crabes femelles à 15°C ont été meilleures que dans les groupes aux autres températures. En même temps, les taux de DHP (17α, 20β-dihydroxy-4-prégnane-3-dione) et E2 (estradiol-17β) ont baissé à 25°C après la ponte, indiquant que 25°C pourrait restreindre la synthèse des hormones sexuelles, ce qui pouvait entrainer un taux de ponte inférieur. Les résultats peuvent apporter une base pour les performances reproductives des femelles d’E. sinensis sous températures élevées, en référence à la protection d’E. sinensis face au réchauffement climatique.

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