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首页> 外文期刊>Estuarine Coastal and Shelf Science >Variation of a sandy beach macrobenthic community along a human-induced environmental gradient
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Variation of a sandy beach macrobenthic community along a human-induced environmental gradient

机译：沙滩大型底栖动物群落沿人为环境梯度的变化

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Among the diverse sources of impact on sandy coasts, man-made freshwater flows and discharges of sewage effluents strongly modify environmental quality by changing salinity and nutrient regimes. However, sandy beaches, which occupy three-quarters of the world's shoreline, have received relatively little attention concerning consequences of this human-induced disturbance on the structure and dynamics of resident fauna. This paper reports the spatial effects of a freshwater canal discharge (Canal Andreoni) on the habitat and resident macrobenthos of an exposed sandy beach through a combined analysis of communities, populations and the surrounding habitat in three sites defined by previous studies as undisturbed (Barra), moderately disturbed (Coronilla) and grossly disturbed (Andreoni). Andreoni showed significant lower values of salinity, beach width, swash width and slope. Abundance, biomass, species richness, diversity and evenness significantly decreased towards the source of disturbance and were significantly and positively correlated with spatial variations in salinity. Multiple regressions explained up to 36% of the variability, often resulting in models composed by only one significant predictor, salinity, which can be considered as an aggregate variable that carries itself with different simultaneous effects in the nearshore-surf zone environment. The cirolanid isopod Excirolana armata generally dominated all sites in abundance, but at significantly lower values in the grossly disturbed site. The suspension feeders Donax hanky anus and Emerita brasiliensis, which were well represented at Barra and Coronilla, did not occur in Andreoni, where insects were the most commonly represented after E. armata. In addition, the number of species and abundance of polychaetes tended to decrease towards the canal mouth, with the exception of punctual pulses of abundance of Scolelepis gaucha at Coronilla. In terms of biomass, the isopod E. armata dominated at Andreoni and Coronilla, whereas the suspension feeders D. hanleyanus and E. brasiliensis dominated at Barra. It is concluded that artificial freshwater discharges could significantly influence the distribution, abundance and community attributes of the biota of sandy beaches, and that further study of these ecosystems should include human activities as important factors affecting spatial and temporal trends. The combination of natural experiments together with macrocosm field and microcosm laboratory experiments is also suggested as a rich research vein for detecting the extent of disturbances in sandy beaches.
机译：在影响沙质海岸的各种因素中，人为的淡水流和污水的排放通过改变盐度和养分制度而极大地改变了环境质量。但是，占世界海岸线四分之三的沙滩，由于这种人为干扰对居住动物的结构和动力学的影响而受到的关注相对较少。本文通过对先前研究定义为不受干扰的三个地点的群落，种群和周围栖息地的综合分析，报告了淡水运河排泄（安德鲁尼运河）对裸露沙滩的栖息地和居民大型底栖动物的空间影响。 ，中度不安（Coronilla）和严重不安（Andreoni）。 Andreoni显示出较低的盐度，海滩宽度，斜流宽度和坡度值。丰富度，生物量，物种丰富度，多样性和均匀性向干扰源显着降低，并且与盐度的空间变化显着正相关。多元回归解释了高达36％的可变性，通常会导致仅由一个重要预测因子盐度组成的模型，盐度可以被视为一个汇总变量，其自身在近海冲浪区环境中具有不同的同时影响。环纹兰等足类Excirolana armata通常在所有位置上都占主导地位，但在严重扰乱位置上的值要低得多。在巴拉（Barra）和科罗尼利亚（Coronilla）很好地代表了悬浮饲养者Donax hanky anus and Emerita brasiliensis，在安德烈奥尼（Andreoni）却没有出现，那里的昆虫是仅次于Armata的昆虫。另外，朝向科隆嘴的多毛鱼类的种类和数量趋向于减少，除了在科罗尼利亚的Scolelepis gaucha的点状脉冲。在生物量方面，等脚虫E. armata在Andreoni和Coronilla占主导地位，而悬浮饲养者D. hanleyanus和E. brasiliensis在Barra占主导地位。结论是，人工淡水排放可能会显着影响沙滩生物群的分布，丰度和群落属性，对这些生态系统的进一步研究应将人类活动作为影响时空趋势的重要因素。还建议将自然实验与宏观领域和微观实验室实验相结合，作为检测沙滩扰动程度的丰富研究脉络。

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