Novoa Leslie, Aldea Cristian, Andrade Claudia, Guarda Belén, Holtheuer Jorge, Schories Dirk
Departamento de Ciencias y Recursos Naturales, Facultad de Ciencias, Universidad de Magallanes, Punta Arenas, Chile Departamento de Ciencias y Recursos Naturales, Facultad de Ciencias, Universidad de Magallanes Punta Arenas Chile.
Programa de Magíster en Ciencias, Mención Manejo y Conservación de Recursos Naturales en Ambientes Subantárticos, Universidad de Magallanes, Punta Arenas, Chile Programa de Magíster en Ciencias, Mención Manejo y Conservación de Recursos Naturales en Ambientes Subantárticos, Universidad de Magallanes Punta Arenas Chile.
Biodivers Data J. 2025 Sep 5;13:e157304. doi: 10.3897/BDJ.13.e157304. eCollection 2025.
The Chilean Fjords and Channels ecoregion presents unique oceanographic conditions that are sensitive to environmental impacts and socio-ecological systems. To assess how these impacts affect these ecosystems, it is essential to examine the current status of highly diverse taxa, such as molluscs, in terms of biodiversity and abundance, as they serve as valuable macroecological indicators of marine ecosystem health. On the south-eastern margin of the Brunswick Peninsula, south of Punta Santa Ana, lies Cape Froward, where a system of eight small bays (< ca. 4 km²) is located, some of which are used as temporary harbours during navigation. Despite previous sampling efforts and existing records, these areas remain poorly described, with the region around Punta Santa Ana Bay being the most extensively documented. As part of monitoring programmes on coastal biodiversity in Magallanes and fishery resource assessments, sublittoral sampling was conducted in Bougainville Bay using autonomous diving (20 m depth) and a modified Agassiz trawl (44 m depth). This study recorded 49 operational taxonomic units, comprising 32 gastropods, nine bivalves and eight polyplacophorans, all of which represent previously unpublished diversity records for this Bay. Additionally, these species were categorised, based on their feeding strategies, providing insights into their ecological roles. These findings also extend to neighbouring bays along the southern Brunswick Peninsula (from El Águila Bay to Cape Froward), where only two sublittoral species - the bivalves and - had been previously documented. In the central micro-basin of the Strait of Magellan (from Second Narrows to Carlos III Island), this study introduces six new records: one bivalve and five gastropods, including two nudibranchs. All findings were compared with data from the Global Biodiversity Information Facility. These newly-documented records are crucial for understanding the biodiversity of molluscs inhabiting frequently navigated maritime areas, serving as indicators of anthropogenic impacts. This is especially relevant given the recent proposal of the area as a National Park.
智利峡湾与海峡生态区呈现出独特的海洋学条件，这些条件对环境影响和社会生态系统较为敏感。为评估这些影响如何作用于这些生态系统，从生物多样性和丰度方面审视高度多样的类群（如软体动物）的现状至关重要，因为它们是海洋生态系统健康状况的重要宏观生态指标。弗罗厄德角位于圣安娜角以南的不伦瑞克半岛东南边缘，那里有一个由八个小海湾（面积小于约4平方千米）组成的系统，其中一些海湾在航行期间被用作临时港口。尽管此前进行过采样工作并有现有记录，但这些区域的描述仍然匮乏，圣安娜角湾周边地区的记录最为详尽。作为麦哲伦海岸生物多样性监测计划和渔业资源评估的一部分，在布干维尔湾利用自主潜水（深度20米）和改良阿加西拖网（深度44米）进行了潮下带采样。本研究记录了49个操作分类单元，包括32种腹足纲动物、9种双壳纲动物和8种多板纲动物，所有这些均代表了该海湾此前未发表的多样性记录。此外，根据它们的摄食策略对这些物种进行了分类，从而深入了解它们的生态作用。这些发现还延伸至不伦瑞克半岛南部的相邻海湾（从阿吉拉湾到弗罗厄德角），此前那里仅记录了两种潮下带物种——双壳纲动物 和 。在麦哲伦海峡的中央微盆地（从第二海峡到卡洛斯三世岛），本研究引入了六项新记录：一种双壳纲动物和五种腹足纲动物，包括两种裸鳃亚目动物。所有研究结果均与全球生物多样性信息机构的数据进行了比较。这些新记录对于理解栖息在频繁通航海域的软体动物的生物多样性至关重要，可作为人为影响的指标。鉴于该区域最近被提议设立为国家公园，这一点尤为重要。
