Towards sustainable fishery management for skates in South America: The genetic population structure of Zearaja chilensis and Dipturus trachyderma (Chondrichthyes, Rajiformes) in the south-east Pacific Ocean
Towards sustainable fishery management for skates in South America: The genetic population structure of Zearaja chilensis and Dipturus trachyderma (Chondrichthyes, Rajiformes) in the south-east Pacific Ocean
复制标题
南美洲鳐鱼可持续渔业管理：东南太平洋玉米赤鳐 (Zearaja chilensis) 和粗皮鳐 (Dipturus trachyderma)（软骨鱼目、Rajiformes）的遗传种群结构
作者：
Carolina Vargas;C. Bustamante;M. Bennett;J. Ovenden
长鼻鳐（Zearaja chilensis 和 Dipturus trachyderma）是东南太平洋软骨鱼渔业的主要组成部分。智利渔业管理部门认为这两个物种是单一种群，但人们对渔业内的人口连通性水平知之甚少。在这项研究中，我们使用遗传变异（线粒体基因组控制区域的 560 bp 和 10 个微卫星位点）来探索智利海岸沿线五个地点的种群连通性。对智利辣椒种群的分析揭示了近海地点（圣安东尼奥、瓦尔迪维亚）、奇洛埃内海的两个地点（蒙特港和艾森）以及智利南部蓬塔阿雷纳斯之间的显着遗传结构。例如，近海地区和蓬塔阿雷纳斯的 mtDNA 单倍型多样性相似（h = 0.46-0.50），但与奇洛埃内海的 mtDNA 单倍型多样性显着不同（h = 0.08）。这些结果引起了人们对内海物种长期生存的担忧，因为种群的恢复能力几乎完全依赖于自我招募。相比之下，几乎没有发现粗皮果蝇遗传结构的证据。我们的结果为智利辣椒的三个管理单位提供了证据，我们建议每个单位都需要单独的管理安排。然而，没有证据表明现存的粗皮双鳍鱼种群被视为单独的管理单位。 D. trachyderma 缺乏遗传种群细分似乎与其较高的扩散能力和更偏爱近海栖息地相对应。
The longnose skates (Zearaja chilensis and Dipturus trachyderma) are the main component of the elasmobranch fisheries in the south-east Pacific Ocean. Both species are considered to be a single stock by the fishery management in Chile however, little is known about the level of demographic connectivity within the fishery. In this study, we used a genetic variation (560 bp of the control region of the mitochondrial genome and ten microsatellite loci) to explore population connectivity at five locations along the Chilean coast. Analysis of Z. chilensis populations revealed significant genetic structure among off-shore locations (San Antonio, Valdivia), two locations in the Chiloé Interior Sea (Puerto Montt and Aysén) and Punta Arenas in southern Chile. For example, mtDNA haplotype diversity was similar across off-shore locations and Punta Arenas (h = 0.46–0.50), it was significantly different to those in the Chiloé Interior Sea (h = 0.08). These results raise concerns about the long-term survival of the species within the interior sea, as population resilience will rely almost exclusively on self-recruitment. In contrast, little evidence of genetic structure was found for D. trachyderma. Our results provide evidence for three management units for Z. chilensis, and we recommend that separate management arrangements are required for each of these units. However, there is no evidence to discriminate the extant population of Dipturus trachyderma as separate management units. The lack of genetic population subdivision for D. trachyderma appears to correspond with their higher dispersal ability and more offshore habitat preference.
使用多位点基因型数据推断群体结构：连锁位点和相关等位基因频率。
影响因子：
3.3
作者：
Falush,Daniel;Stephens,Matthew;Pritchard,JonathanK
通讯作者：
Pritchard,JonathanK