Fish assemblage composition within the floodplain habitat mosaic of a tropical lake (Tonle Sap, Cambodia)
Fish assemblage composition within the floodplain habitat mosaic of a tropical lake (Tonle Sap, Cambodia)
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热带湖泊洪泛区栖息地马赛克内的鱼类组合组成（柬埔寨洞里萨湖）
DOI：
10.1111/fwb.13391
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发表时间：
2019
影响因子：
2.7
通讯作者：
Chevalier, Mathieu
中科院分区：
文献类型：
--
作者：
Pool, Thomas;Elliott, Vittoria;Holtgrieve, Gordon;Arias, Mauricio;Altman, Irit;Kaufman, Leslie;McCann, Kevin;Fraser, Evan D.;Tudesque, Loïc;Chevalier, Mathieu
为了有效保护洪水脉冲流域内的生物多样性模式，需要了解生境异质性如何与其相关。为了研究这些群落，研究人员已经开始探索当地环境因素如何在复杂的栖息地马赛克中以相对精细的尺度影响物种组成模式。然而，对群落组成与其洪泛区栖息地特征之间联系的有力描述仍然不清楚。在柬埔寨的洞里萨湖（TSL）中，我们评估了整个洪泛区的中生境规模（1-5公里）因素是否在时间和空间上构造了鱼类组合。首先，我们确定 TSL 鱼类组合是否随季节变化，如果是，则哪些组合成分推动了这种变化。其次，我们确定了湿季期间环境因素是否影响了洪泛区中生境斑块的鱼类组成。第三，我们评估了雨季期间优势物种是否对洪泛区特定区域表现出亲和力，从而有可能确定鱼类组合的关键中生境斑块。从2014年3月到2015年1月，每三个月从沿海拔梯度穿过洪泛区的九个地点收集鱼类。使用对应分析和方差分析来评估物种组成的季节变化。然后使用典型对应分析和壁炉架测试来确定构成鱼类组合的环境因素的重要性。鱼类组合随季节变化；特别是，旱季期间迁徙物种的出现减少。在雨季，鱼类群落的空间结构受到植被和水质等中生境尺度因素的影响。此外，与永久湖泊直接相邻的被淹没的森林中生境显示出特别高的物种丰富度和丰度。然而，大多数 TSL 物种似乎具有高度流动性，发生在多个洪泛区中生境中。我们得出的结论是，TSL 内的鱼类组合结构和洪泛区中生境的利用可能在很大程度上取决于自然流态的维持。由于上游水坝的开发可能会改变水流状况，因此当地居民赖以生存的渔业循环与筑坝湄公河系统带来的水力发电和农业效益之间将出现权衡。
Understanding how habitat heterogeneity is linked to biodiversity patterns within flood–pulse catchments is needed for their effective conservation. To study those communities, researchers have begun to explore how local environmental factors influence species composition patterns at relatively fine scales within complex habitat mosaics. However, a robust description of the link between communities’ composition and their floodplain habitat characteristics remains poorly articulated.In the Tonle Sap Lake (TSL) of Cambodia, we evaluated whether mesohabitat‐scale (1–5 km) factors throughout the floodplain structured the fish assemblage temporally and spatially. First, we determined whether TSL fish assemblage changed seasonally and, if so, what assemblage components were driving that change. Second, we determined whether environmental factors structured fish composition across floodplain mesohabitat patches during the wet season. Third, we evaluated whether dominant species displayed affinities for specific areas within the floodplain during the wet season, potentially identifying critical mesohabitat patches for the fish assemblage.Fish were collected from nine sites along an elevational gradient traversing the floodplain every 3 months from March 2014 through January 2015. Correspondence analysis and analysis of variance were used to assess seasonal variation in the species composition. Canonical correspondence analysis and a mantel test were then used to identify the significance of environmental factors structuring the fish assemblage.Fish assemblages changed across seasons; in particular, migratory species occurrence decreased during the dry season. During the wet season, the fish assemblage was structured spatially by mesohabitat‐scale factors such as vegetation and water quality. Furthermore, the flooded forest mesohabitat directly adjacent to the permanent lake displayed particularly high species richness and abundance. However, a majority of TSL species appeared to be highly mobile, occurring across multiple floodplain mesohabitats.We concluded that fish assemblage structure and floodplain mesohabitat use within TSL may depend strongly upon the maintenance of the natural flow regime. Since the flow regime will probably be modified by upstream dam development, trade‐offs will emerge between the cycle of fishing on which local residents depend, and the hydropower and agricultural benefits of damming the Mekong River system.
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DOI：
--
发表时间：
2004
期刊：
The Botanical review
影响因子：
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作者：
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DOI：
10.52107/mrc.ajhzbv
发表时间：
2007
期刊：
Regulated Rivers-research & Management
影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
Arias, Mauricio E.;Cochrane, Thomas A.;Piman, Thanapon
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Piman, Thanapon
影响因子：
2.7
作者：
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影响因子：
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作者：
M. Arias;T. Cochrane;Vittoria Elliott
通讯作者：
Vittoria Elliott