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Seasonality and spatial variation in nekton assemblages of the lower apalachicola river

机译：下阿巴拉契科拉河的尼克顿组合的季节性和空间变化

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摘要

The results of statistical analyses conducted on monthly trawl and seine data collected from a multiyear fisheries-independent monitoring program, between July 2006 and March 2009 on the lower Apalachicola River, FL were used to determine which regions of the river, and what time of year should be further studied to determine if and how freshwater flow alterations affect the nekton. Differences in nekton community structure were clear between each of the 3 predefined habitat regions for shoreline seine catches. Deepwater trawled habitats showed a distinct difference between the upper river channel and both distributary regions, and less pronounced differences between the two distributary regions. The strongest pattern in seasonality of nekton communities coincides with seasonal fluctuations in recruitment of juveniles into the estuary and the periods of greatest salinity differences in the marshgrass-dominated lower distributary region for shoreline and deepwater habitats. Seasonal variations in community structure were evident and mostly likely dominated by recruitment, whereas the response of organisms to fluctuations in salinity may be dictated by their relative position within the lower reaches of the Apalachicola River system. Our results suggest that future studies of the effects of changes in flow on nekton assemblages in the lower Apalachicola River would best be performed during the dry season in the upper and lower portions of the distributary region.
机译：对从2006年7月至2009年3月在佛罗里达州阿巴拉契科拉河下游进行的多年渔业独立监测计划收集的每月拖网和围网数据进行统计分析的结果，用于确定河流的哪些地区以及每年的什么时间应该进一步研究以确定淡水流量变化是否以及如何影响尼康。海岸线围网捕捞的3个预定栖息地区域之间，显然有Nekton群落结构的差异。深水拖网的栖息地在上游河道与两个分布区之间都表现出明显的差异，而在两个分布区之间则没有那么明显的差异。奈克顿群落的季节性最强模式与沿河和深水生境的以沼泽为主导的下部分布区的幼鱼进入河口的季节性波动以及最大盐度差异的时期相吻合。群落结构的季节性变化是明显的，并且很可能主要由募集所主导，而有机物对盐度波动的响应可能取决于它们在阿巴拉契科拉河系统下游的相对位置。我们的结果表明，未来对流量变化对阿巴拉契科拉河下游的尼顿河集结的影响的研究最好在分流区上部和下部的干旱季节进行。

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