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Effects of cold-water corals on fish diversity and density (European continental margin: Arctic, NE Atlantic and Mediterranean Sea): Data from three baited lander systems

机译:冷水珊瑚对鱼类多样性和密度的影响(欧洲大陆边缘:北极,东北大西洋和地中海):来自三个诱饵登陆器系统的数据

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Autonomous photographic landers are a low-impact survey method for the assessment of mobile fauna in situations where methods such as trawling are not feasible or ethical. Three institutions collaborated through the CoralFISH project, each using differing lander systems, to assess the effects of cold-water corals on fish diversity and density. The Biogenic Reef Ichthyofauna Lander (BRIL, Oceanlab), Autonomous Lander for Biological Experiments (ALBEX, NIOZ) and the Marine Environment MOnitoring system (MEMO, CoNISMa) were deployed in four CoralFISH European study regions covering the Arctic, NE Atlantic and Mediterranean, namely Northern Norway (275-310 m depth), Belgica Mound Province (686-1025 m depth), the Bay of Biscay (623-936 m depth), and Santa Maria di Leuca (547-670 m depth). A total of 33 deployments were carried out in the different regions. Both the time of first arrival (T-arr) and the maximum observed number of fish (MaxN) were standardised between the different lander systems and compared between coral and reference stations as indicators of local fish density. Fish reached significantly higher MaxN at the coral stations than at the reference stations. Fish were also found to have significantly lower T-arr, in the coral areas in data obtained from the BRIL and MEMO landers. All data indicated that fish abundance is higher within the coral areas. Fish species diversity was higher within the coral areas of Atlantic Ocean while in Northern Norway and Santa Maria di Leuca coral areas, diversity was similar at coral and reference stations but a single dominant species (Brosme brosme and Conger conger respectively) showed much higher density within the coral areas. Indicating that, while cold-water coral reefs have a positive effect on fish diversity and/or abundance, this effect varies across Europe's reefs.
机译:自主照相着陆器是在拖网等方法不可行或不符合道德的情况下,对机动动物区系进行评估的低影响调查方法。三个机构通过CoralFISH项目进行了合作,每个项目都使用不同的着陆器系统,以评估冷水珊瑚对鱼类多样性和密度的影响。已在四个CoralFISH欧洲研究区域(包括北极,东北大西洋和地中海)中部署了生物礁Ichthyofauna Lander(BRIL,Oceanlab),用于生物实验的自主Lander(ALBEX,NIOZ)和海洋环境监测系统(MEMO,CoNISMa)。挪威北部(深度275-310 m),比利时土墩省(深度686-1025 m),比斯开湾(深度623-936 m)和圣玛丽亚迪莱卡(深度547-670 m)。在不同地区共进行了33次部署。首次登陆时间(T-arr)和最大观察到的鱼类数量(MaxN)都在不同的着陆器系统之间进行了标准化,并在珊瑚站和参考站之间进行了比较,以作为当地鱼类密度的指标。鱼在珊瑚站的最大氮含量比参考站的高得多。从BR​​IL和MEMO着陆器获得的数据中,在珊瑚区域,鱼类的T-arr也显着降低。所有数据表明,珊瑚区域内的鱼类丰度更高。大西洋珊瑚区内的鱼类物种多样性较高,而挪威北部和圣玛丽亚迪莱卡珊瑚区的珊瑚和参考站的多样性相似,但单一优势种(分别为Brosme brosme和Conger conger)显示出更高的密度。珊瑚区。这表明,尽管冷水珊瑚礁对鱼类的多样性和/或丰富度具有积极影响,但这种影响在整个欧洲的珊瑚礁上有所不同。

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