Climate effects on fish diversity in the subtropical bays of Texas
Climate effects on fish diversity in the subtropical bays of Texas
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DOI：
10.1016/j.ecss.2020.107121
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发表时间：
2021-02-05
影响因子：
2.8
通讯作者：
Martinez-Andrade, Fernando
中科院分区：
文献类型：
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作者：
Pawluk, Michaela;Fujiwara, Masami;Martinez-Andrade, Fernando
气候变化影响温度、海平面和盐度，所有这些都会影响鱼类的分布。为了评估气候变化对德克萨斯州海洋鱼类群落的影响，模拟了鱼类多样性对气候变量的响应。利用33年的刺网调查数据，从8个主要海湾沿着德克萨斯州海岸，渐近香农多样性估计每个海湾，季节，每年使用稀疏分析。这使得空间，时间和季节性的鱼类多样性的趋势估计。为了评估气候相关变量对德克萨斯州鱼类群落的影响，我们使用重复测量模型方法将香农多样性指数与环境变量相关联。我们发现，在所有八个海湾的鱼类多样性显着增加的趋势，在秋季和六个海湾的八个春天。在被确定为重要的变量中，温度、盐度和海平面是推动鱼类多样性增加的最重要因素。我们的研究结果表明，所观察到的增加可能是由于海平面上升和冬季温度升高导致的栖息地可用性变化。红树林的扩张和暖冬可能使热带物种的活动范围得以扩大，推动了所观察到的鱼类多样性的增加。
Climate change affects temperatures, sea level, and salinities, all of which can affect fish distributions. In order to assess the impact of climate change on the marine fish communities of Texas, fish diversity response to climate variables was modeled. Leveraging 33 years of gillnet survey data from eight major bays along the coast of Texas, asymptotic Shannon diversity was estimated for each bay, season, and year using rarefaction analysis. This allowed for the estimation of spatial, temporal, and seasonal trends in fish diversity. In order to assess the impact of climate-related variables on the fish communities of Texas, we associated the Shannon diversity index with environmental variables using a repeated measures model approach. We found significant increasing trends in fish diversity across all eight bays in fall and six of eight bays in spring. Among the variables identified as significant, temperature, salinity, and sea level stood out as most important for driving the increase in fish diversity. Our results suggest that observed increases may be attributable to changing habitat availability resulting from sea-level rise and increasing winter temperatures. Mangrove expansion and warmer winters are likely allowing for range expansion by tropical species, driving the observed increase in fish diversity.