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首页> 外文期刊>Hydrobiologia >Numerical increases and distributional shifts of Chrysaora quinquecirrha (Desor) and Aurelia aurita (Linné) (Cnidaria: Scyphozoa) in the northern Gulf of Mexico
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Numerical increases and distributional shifts of Chrysaora quinquecirrha (Desor) and Aurelia aurita (Linné) (Cnidaria: Scyphozoa) in the northern Gulf of Mexico

机译：墨西哥北部北部湾地区的Chrysaora quinquecirrha（Desor）和Aurelia aurita（Linné）（Cnidaria：Scyphozoa）的数量增加和分布变化

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摘要

Fisheries resource trawl survey data from the National Marine Fisheries Service from a 11–13-year period to 1997 were examined to quantify numerical and distributional changes of two species of northern Gulf of Mexico scyphomedusae: the Atlantic sea nettle, Chrysaora quinquecirrha (Desor), and the moon jelly, Aurelia aurita (Linné). Trawl surveys were grouped into 10 statistical regions from Mobile Bay, Alabama to the southern extent of Texas, and extended seaward to the shelf break. Records of summertime C. quinquecirrha medusa populations show both an overall numerical increase and a distributional expansion away from shore in the down-stream productivity field of two major river system outflows: Mobile Bay and the Mississippi-Atchafalaya Rivers. In addition, there is a significant overlap between summer C. quinquecirrha and lower water column hypoxia on the Louisiana shelf. In trawl surveys from the fall, A. aurita medusae showed significant trends of numerical increase in over half of the regions analyzed. For both species, there were statistical regions of no significant change, but there were no regions that showed significant decrease in number or distribution. The relationships between natural and human-induced (e.g. coastal eutrophication, fishing activity and hard substrate supplementation) ecosystem modifications are very complex in the Gulf of Mexico, and the potential impact of increased jellyfish populations in one of North America's most valuable fishing grounds is a most critical issue. Several hypotheses are developed and discussed to guide future research efforts in the Gulf of Mexico.
机译：美国国家海洋渔业局（National Marine Fisheries）从1997年到11年间的渔业资源拖网调查数据进行了调查，以量化北墨西哥北部湾甲藻的两种物种的数量和分布变化：大西洋海荨麻，金瓜，还有月亮果冻Aurelia aurita（Linné）。拖网调查分为从阿拉巴马州莫比尔湾到得克萨斯州南部的10个统计区域，并向海延伸至陆架断裂。夏季的美西C. quinquecirrha人口种群记录显示，在两个主要河流系统流出的下游生产力领域中，沿岸生产力总体上有所增加，并且分布远离海岸的分布扩展：莫比尔湾和密西西比河-阿塔法拉雅河。此外，路易斯安那州架子上的夏季西洋西葫芦与下部水柱缺氧之间存在明显的重叠。在从秋季开始的拖网调查中，A。aurita medusae在超过一半的分析区域中显示出明显的数值增加趋势。两种物种的统计区域均无显着变化，但没有区域显示数量或分布显着下降。在墨西哥湾，自然和人为因素（例如沿海富营养化，捕鱼活动和坚硬的底物补充）生态系统修改之间的关系非常复杂，在北美最有价值的捕鱼区之一中，水母种群增加的潜在影响是最关键的问题。提出并讨论了几种假设，以指导墨西哥湾未来的研究工作。

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