Biodiversity and distribution of deep-pelagic fishes from the subtropical Southwestern Atlantic

IF 2.1 3区 地球科学 Q2 OCEANOGRAPHY
Aline Barbosa Silva , Leandro Nolé Eduardo , Juliano Lauser Coletto , Laura Alma Costa , Rafael André Avila , José Henrique Muelbert
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引用次数: 0

Abstract

We conducted a biodiversity assessment of deep-pelagic fish species in the Subtropical Southwestern Atlantic Ocean, using three complementary fishing methods across depths from 97 to 2570 m between 1996 and 2022. This analysis includes 926,657 specimens, representing 74 species from 11 orders and 18 families. Using these data, we present relationships with environmental factors and a detailed species inventory illustrating diversity and dominance patterns. Distinct from other Southwestern Atlantic ecoregions, our findings reveal high species dominance coupled with relatively low diversity. Among the collected taxa, Diaphus dumerilii (Myctophidae) and Maurolicus stehmanni (Sternoptychidae) constituted over 90 % of all specimens. Analysis of their distribution in relation to water properties reveals that these species exhibit a greater tolerance to a broad range of temperature and salinity conditions, an adaptive trait that likely drives their ecological dominance in the deep-pelagic ecosystems of the study area. The dominance pattern held consistently across all fishing methods, though we observed notable variation in species diversity and abundance between collection techniques. This study provides an important assessment of the deep-pelagic fish fauna in this region, establishing a valuable baseline for future research targeting this largely unexplored fauna.
西南大西洋亚热带深海鱼类的生物多样性和分布
1996年至2022年,采用三种互补的捕捞方法,对西南大西洋副热带97 ~ 2570 m的深海鱼类进行了生物多样性评估。共收集标本926657份,隶属于18科11目74种。利用这些数据,我们提出了与环境因素的关系和详细的物种清单,说明了多样性和优势模式。与其他西南大西洋生态区不同的是,我们的研究结果表明,物种优势度高,多样性相对较低。在收集到的分类群中,有超过90%的标本来自于dumerilius (mytophidae)和Maurolicus stehmanni (Sternoptychidae)。对其分布与水特性的分析表明,这些物种对广泛的温度和盐度条件表现出更大的耐受性,这一适应特征可能推动了它们在研究区域的深海生态系统中的生态优势。尽管我们观察到不同采集技术之间的物种多样性和丰度存在显著差异,但优势模式在所有捕捞方法中都保持一致。该研究为该地区的深海鱼类区系提供了重要的评估,为未来针对这一尚未开发的区系的研究建立了有价值的基线。
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来源期刊
CiteScore
4.60
自引率
4.20%
发文量
144
审稿时长
18.3 weeks
期刊介绍: Deep-Sea Research Part I: Oceanographic Research Papers is devoted to the publication of the results of original scientific research, including theoretical work of evident oceanographic applicability; and the solution of instrumental or methodological problems with evidence of successful use. The journal is distinguished by its interdisciplinary nature and its breadth, covering the geological, physical, chemical and biological aspects of the ocean and its boundaries with the sea floor and the atmosphere. In addition to regular "Research Papers" and "Instruments and Methods" papers, briefer communications may be published as "Notes". Supplemental matter, such as extensive data tables or graphs and multimedia content, may be published as electronic appendices.
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