An acoustic-optic comparison of fish assemblages at a Rigs-to-Reefs habitat and coral reef in the Gulf of Thailand

An acoustic-optic comparison of fish assemblages at a Rigs-to-Reefs habitat and coral reef in the Gulf of Thailand
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泰国湾钻机到珊瑚礁栖息地和珊瑚礁鱼类群落的声光比较

DOI:
10.1016/j.ecss.2023.108552
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发表时间:
2023
期刊:
Estuarine, Coastal and Shelf Science
影响因子:
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通讯作者:
Sibley E
Sibley E
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作者:
Sibley E

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未来几十年,退役石油和天然气平台的数量将增加。在热带和亚热带地区,平台可能在生物多样性自然栖息地(如珊瑚礁)附近作业。丰富多样的鱼类群落往往聚集在平台周围,不同的退役方案对这些组合产生不同的生态影响。一个退役的选择是将平台改造成人工鱼礁,这一过程通常被称为“钻机到珊瑚礁”(RTRs)。许多RTR计划试图保留或提高栖息地的可用性和相关的鱼类聚集。为显示重建计划的重要性,我们可将重建计划的鱼类群落与邻近自然生境的鱼类群落作比较,以估计重建计划的鱼类生境价值。在浑浊的沃茨中测量鱼类栖息地需要使用可以量化鱼类的丰度、生物量和长度的方法,而不管能见度如何。使用成像声纳(1.2. MHz),并实施一种新的,基于像素的方法类似于回声集成,这项研究估计的相对生物量密度和长度分布的鱼类在7个倾倒的石油和天然气平台导管架在Reefed Jacket区(RJZ)在泰国湾的近岸西部与附近的珊瑚礁相比。生物量密度是可比的,在每个栖息地,尽管在RJZ的极端变化,归因于时空随机性较大,学校的鱼。然而,鱼在RJZ较大,同步立体视频画面支持的趋势。在这项研究中遇到的成像声纳的相对优点和缺点也进行了说明。
The number of decommissioned oil and gas platforms will increase over the coming decades. In the tropics and sub-tropics, platforms may operate near biodiverse natural habitats, such as coral reefs. Abundant and diverse fish communities often aggregate around platforms, with different decommissioning options posing variable ecological effects on these assemblages. One decommissioning option is to repurpose platforms into artificial reefs, a process commonly termed “Rigs-To-Reefs” (RTRs). Many RTR programs attempt to retain or enhance habitat availability and associated fish assemblages. To help demonstrate the importance of RTR projects, the fish habitat value of RTRs can be estimated by comparing the fish communities of RTRs to those of adjacent natural habitats. Surveying fish habitats in turbid waters necessitates the use of methods that can quantify the abundance, biomass, and length of fishes irrespective of visibility. Using an imaging sonar (1.2. MHz) and implementing a novel, pixel-based approach analogous to echo-integration, this study estimated the relative biomass density and length distribution of fishes at seven toppled oil and gas platform jackets in a Reefed Jacket Zone (RJZ) in the nearshore western Gulf of Thailand in comparison with a nearby coral reef. Biomass density was comparable at each habitat, despite extreme variability across the RJZ, attributed to the spatiotemporal stochasticity of larger, schooling fishes. However, fishes were larger at the RJZ, a trend supported by simultaneous stereo-video footage. The relative benefits and drawbacks of imaging sonar encountered in this study are also described.
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