The influence of oceanographic variables on assemblages of meso- and bathypelagic fish was investigated along a Northeastern Atlantic Ocean transect (Cape Verde to the Bay of Biscay) during May 2019. Fish were collected using a mrozooplankton trawl during daylight hours at ten stations. Along the transect, 17 hydrographic stations were also performed with a CTD (Conductivity, Temperature, and Depth). A total of 130 fish taxa were identified. The dominant family was Gonostomatidae, with four species (Cyclothone braueri, Cyclothone microdon, Cyclothone pseudopallida, and Cyclothone pallida) being responsible of more than 78% of the total density. The most frequent species that appeared to be ubiquitous were C. braueri and C. pseudopallida, while Myctophidae was the most diverse family. Multivariate analyses revealed two clusters related with the latitudinal gradient. The fish community in the southern stations (25–37°N) was more diverse than in the northern stations (42–48°N). Temperature from 300 to 700 m depth explained 65% of variation in terms of density and 58% in terms of biomass, both statistically significant. The investigated variation in the deep-pelagic ecosystems on a large spatial scale gives essential information to ecosystem management approhes and marine spatial planning.

中文翻译：

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沿东北大西洋横断面的中远洋和深海鱼类的生物地理格局

2019 年 5 月期间，沿大西洋东北部横断面（佛得角至比斯开湾）调查了海洋变量对中远洋和深海鱼类群落的影响。白天，在 10 个站点使用浮游生物拖网收集鱼类。沿着样带，还使用 ​​CTD（电导率、温度和深度）执行了 17 个水文站。共鉴定了 130 种鱼类分类群。占优势的科是 Gonostomatidae，有四个物种（Cyclothone braueri、Cyclothone microdon、Cyclothone pseudopallida 和 Cyclothone pallida）占总密度的 78% 以上。似乎普遍存在的最常见的物种是 C. braueri 和 C. pseudopallida，而 Myctophidae 是最多样化的科。多变量分析揭示了两个与纬度梯度相关的集群。南部站（25-37°N）的鱼类群落比北部站（42-48°N）更加多样化。从 300 到 700 m 深度的温度解释了 65% 的密度变化和 58% 的生物量变化，两者都具有统计学意义。在大空间尺度上研究的深海生态系统变化为生态系统管理方法和海洋空间规划提供了重要信息。