The Pelagic Habitat of Swordfish (Xiphias gladius) in the Changing Environment of the North Indian Ocean

The Pelagic Habitat of Swordfish (Xiphias gladius) in the Changing Environment of the North Indian Ocean
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北印度洋环境变化中剑鱼(Xiphiasgladius)的远洋栖息地

DOI:
10.3390/su11247070
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发表时间:
2019-12
期刊:
影响因子:
3.9
通讯作者:
Oey L
Oey L
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Elepathage T S M;Tang D;Oey L

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剑鱼是一种高度迁徙的关键物种,生活在受环境参数影响的热带和温带海域。在孟加拉湾、阿拉伯海和斯里兰卡周边海域,由于气候变化,环境正在逐渐变化。在这项研究中,我们利用卫星获取的环境数据和现场渔获量数据确定了剑鱼的较佳环境条件。我们使用增强回归树(BRT)和广义加性模型(GAM)方法对鱼类分布与环境变化之间的关系进行了建模。10~3月月平均捕捞努力较高,9~11月渔获率较高。叶绿素a浓度与捕获率呈正相关,而海表面温度(SST)、海盐表面质量浓度(SSS)和作用力呈负相关。约0.3~0.4mgm−3的叶绿素a、28~28.5°C的SST和(3~5)10−8kgm−3与剑鱼的高捕获率显著相关。根据上述模型确定的最佳环境条件,绘制了适宜的环境时空分布图。结果表明,6~8月斯里兰卡东部地区、泰国和缅甸附近地区,9~11月孟加拉国、缅甸、巴基斯坦、斯里兰卡西岸和印度东部沿海地区是剑鱼生长的最佳条件。
Swordfish (Xiphias gladius) are a highly migratory keystone species, found in tropical and temperate seas that are influenced by environmental parameters. In the Bay of Bengal, the Arabian Sea, and the ocean region around Sri Lanka, the environment is gradually changing as a result of climate change. In this study, we identified the preferable environmental conditions for swordfish using satellite-derived environmental data and in-situ fish catch data. We modeled the relationships between fish distribution and the environment changes using Boosted Regression Trees (BRT) and Generalized Additive Model (GAM) methods. The monthly mean fishing effort is comparatively high from October to March and the fish catch rates are high from September to November. Chlorophyll-a concentration has a positive relationship with catch rates while sea surface temperature (SST), sea salt surface mass concentration (SSS), and effort show negative relationships. Approximately 0.3–0.4 mgm−3 of chlorophyll-a, 28–28.5 °C SST, and (3–5)10−8 kgm−3 of SSS were significantly correlated with high swordfish catch rates. According to the optimum environmental conditions identified using the above models, the suitable environmental spatial and temporal distribution was mapped. The results show that the optimum conditions for swordfish are in the eastern region of Sri Lanka, around Thailand and Myanmar, from June to August, and around Bangladesh, Myanmar, Pakistan, the west coast of Sri Lanka, and the east coast of India during September to November.
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发表时间: 2006
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