The influence of depth on the Mediterranean reef fish assemblage revealed by the new video on underwater scooter method

IF 1 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Acta Adriatica Pub Date : 2020-12-28 DOI:10.32582/AA.61.2.3
I. Glavičić, M. Kovačić, D. Paliska, D. Laslo
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引用次数: 1

Abstract

The new video on underwater scooter method in combination with rebreather diving techniques was introduced and applied for visual census of fish assemblages. The presently applied method facilitates deeper visual census studies below 40 m, where they have rarely been done before due to the increasing research challenges with depth. The video on underwater scooter method is also expected to be less disturbing and faster compared to swimming divers. The method was applied in visual census study of fish assemblages from 8 to 50 m depth conducted at two locations in the east Adriatic using 102 video transects. The environmental variables contributing to the variation of the reef fish community in the depth range of the infralittoral and upper circalittoral bottoms were also recorded. Thirty-one fish species were recorded on transects and 10.3% of all individuals were not identified to the species level. The average density on transects was 0.8 individuals/m², with C. chromis, C. julis and G. auratus being both the most abundant and the most frequent species. Three environmental variables, depth, bottom with zoocover and eastern orientation of the coast, were identified as highly significant for species occurrence. Abundance and species richness of fish assemblages showed no significant variation with depths, inclinations, orientations and sites. A significant difference in the fish assemblage structure was found among orientations, depths and inclinations with the gradient change of species composition with increasing depth and with increasing inclination.
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水下滑板车方法的新视频揭示了深度对地中海珊瑚礁鱼类组合的影响
介绍了一种新的水下滑板船视频方法,并将其与换气潜水技术相结合,用于鱼类种群的视觉普查。目前应用的方法促进了40米以下更深层次的视觉普查研究,由于深度的研究挑战越来越大,以前很少在40米以下进行视觉普查研究。与游泳潜水员相比,水下滑板车方法的视频也有望减少干扰,速度更快。该方法在亚得里亚海东部两个地点使用102个视频样带对8至50 m深度的鱼类种群进行了视觉普查研究。记录了影响浅海下和浅海上底深度范围内暗礁鱼类群落变化的环境变量。在样带上记录到31种鱼类,10.3%的个体未被鉴定到物种水平。样地上平均密度为0.8只/m²,其中色蛾、朱氏蛾和金缕蛾数量最多,分布频率最高。研究发现,深度、有动物覆盖的海底和海岸的东部方向这三个环境变量对物种的发生具有重要意义。鱼类群落的丰度和物种丰富度随深度、倾角、方位和地点的变化不显著。鱼类组合结构在方向、深度和倾斜度上存在显著差异,物种组成随深度和倾斜度的增加而发生梯度变化。
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来源期刊
Acta Adriatica
Acta Adriatica 生物-海洋与淡水生物学
CiteScore
1.60
自引率
11.10%
发文量
13
审稿时长
>12 weeks
期刊介绍: Journal "Acta Adriatica" is an Open Access journal. Users are allowed to read, download, copy, redistribute, print, search and link to material, and alter, transform, or build upon the material, or use them for any other lawful purpose as long as they attribute the source in an appropriate manner according to the CC BY licence.
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