Investigating Genetic Diversity in Hatchery-Produced Dentex dentex and Sciaena umbra for Restocking in Corsican Waters

IF 2.2 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Salomé Ducos, Patrick Berrebi, Bruno Guinand, Mikaël Demolliens, Antoine Aiello, Eric D. H. Durieux
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Abstract

Dentex dentex and Sciaena umbra are two coastal fish species inhabiting Mediterranean waters, where they are considered threatened (assessed as ‘Vulnerable’ on the IUCN Red List). With increased knowledge of both species reproduction, they are envisioned as potential candidate species for restocking purposes around Corsica. However, such actions require genetic monitoring of juveniles that aimed to be released in order to make sure that restocking could not alter the natural genetic diversity. This study aimed to investigate microsatellite gene diversity of hatchery-reared D. dentex and S. umbra juveniles (8 and 11 microsatellite markers, respectively), compared to wild Corsican populations. In each species, broodstock genetic diversity turned out to be quite representative of wild populations. However, this study highlighted that the effective number of breeders was very small in S. umbra (29% of the broodstock participated in juveniles' production) and was composed of dominant parents (i.e., higher contribution of these parents to juvenile production) in D. dentex (one male and one female produced the majority of the juvenile sample). This led to heterozygote excess in juvenile samples and a significant genetic differentiation between (i) juvenile and wild samples and (ii) juvenile and broodstock samples, in both species. Broodstock individuals used in this study were fished in the wild, which was proven here not be sufficient for maintaining the level of genetic diversity found in natural populations. This study highlighted the idea that husbandry production might induce genetic distortion and therefore that genetic controls on hatchery-produced juveniles are essential for restocking purposes.

Abstract Image

科西嘉水域孵化场养殖大牙鲷和黑影大牙鲷的遗传多样性研究
Dentex dentex 和 Sciaena umbra 是栖息在地中海水域的两种沿海鱼类,它们被认为受到威胁(在世界自然保护联盟红色名录中被评估为 "易危")。随着对这两种鱼类繁殖情况了解的增加,它们被认为是科西嘉岛附近重新放养的潜在候选鱼种。然而,此类行动需要对准备放流的幼鱼进行遗传监测,以确保重新放流不会改变自然遗传多样性。本研究旨在调查孵化饲养的 D. dentex 和 S. umbra 幼鱼(分别有 8 个和 11 个微卫星标记)与科西嘉野生种群相比的微卫星基因多样性。结果表明,每种鱼类的育苗遗传多样性都很能代表野生种群。然而,这项研究突出表明,脐带鱼的有效繁殖者数量非常少(29%的雏鱼参与了幼鱼的生产),而D. dentex的有效繁殖者由优势亲本组成(即这些亲本对幼鱼生产的贡献较大)(一雄一雌生产了大部分幼鱼样本)。这导致两种鱼的幼鱼样本中杂合基因过多,(i) 幼鱼样本与野生样本之间以及(ii) 幼鱼样本与鱼苗样本之间的遗传差异显著。本研究中使用的雏鱼个体是在野外捕捞的,事实证明这不足以维持自然种群中的遗传多样性水平。这项研究强调了畜牧生产可能会导致遗传扭曲的观点,因此对孵化生产的幼鱼进行遗传控制对于重新放养至关重要。
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来源期刊
Aquatic Conservation-Marine and Freshwater Ecosystems
Aquatic Conservation-Marine and Freshwater Ecosystems 环境科学-海洋与淡水生物学
CiteScore
5.50
自引率
4.20%
发文量
143
审稿时长
18-36 weeks
期刊介绍: Aquatic Conservation: Marine and Freshwater Ecosystems is an international journal dedicated to publishing original papers that relate specifically to freshwater, brackish or marine habitats and encouraging work that spans these ecosystems. This journal provides a forum in which all aspects of the conservation of aquatic biological resources can be presented and discussed, enabling greater cooperation and efficiency in solving problems in aquatic resource conservation.
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