Cornello Michele, Boscolo Rossella, Giovanardi Otello
Istituto Centrale per la Ricerca scientifica e tecnologica Applicata al Mare (ICRAM), Loc. Brondolo, 30015 Chioggia (VE), Italy.
Sci Total Environ. 2005 Dec 15;353(1-3):329-39. doi: 10.1016/j.scitotenv.2005.09.022. Epub 2005 Oct 10.
In June 2000 and July 2002, two mucous aggregation events of large proportion occurred in the Adriatic Sea. In order to assess the possible effects that the events had on the macrofauna, we studied macro-zoobenthic assemblages and mussel culture (Mytilus galloprovincialis). Structural parameters of macro-zoobenthos and growth parameters of mussels were recorded. The study area was a mussel farm located 5 nautical miles off Porto Caleri (Rovigo, Italy) in the Northern Adriatic Sea. Between May 2000 and August 2002, two sites were sampled in this area and univariate and multivariate techniques were used to describe the macrobenthic community. Two-way ANOVA showed that mean values of species number, density (individuals m(-2)) and Shannon-Wiener's diversity were significantly influenced (p<0.01) by site and period of sampling and by the interactions of these factors. The Pielou's J averages were significantly influenced only by period (p<0.01). Application of Tuckey's HSD test (p<0.05) to factors detected to be significant by ANOVA did not show significant differences between samples collected after the mucous aggregation events and the other periods. Cluster analysis and MDS ordination did not allow a clear distinction between the samples. Concerning mussels, one-way ANOVA showed that mean values of the shell length and the condition index (dry weight/shell weight) were significantly influenced (p<0.001) by the months. The mean values both for shell length and condition index were higher in 2001. The shell length trend revealed a slowing down of growth in June-July 2000 and July-August 2002, and the condition index trend showed a significant fall in samples of June 2000 and July 2002. The growth of M. galloprovincialis might be influenced negatively by mucous aggregates, whereas the soft-bottom macro-zoobenthos seems not to be directly affected by the event.
2000年6月和2002年7月，亚得里亚海发生了两起大面积的黏液聚集事件。为了评估这些事件对大型底栖动物可能产生的影响，我们研究了大型底栖动物群落和贻贝养殖（加利福尼亚贻贝）。记录了大型底栖动物的结构参数和贻贝的生长参数。研究区域是位于亚得里亚海北部距卡莱里港（意大利罗维戈）5海里处的一个贻贝养殖场。2000年5月至2002年8月期间，在该区域的两个地点进行了采样，并使用单变量和多变量技术来描述大型底栖动物群落。双向方差分析表明，物种数量、密度（个体数/m²）和香农-维纳多样性的平均值受到采样地点、采样时间以及这些因素相互作用的显著影响（p<0.01）。皮洛均匀度指数平均值仅受时间显著影响（p<0.01）。对经方差分析检测为显著的因素应用图基的HSD检验（p<0.05），未显示黏液聚集事件后采集的样本与其他时期的样本之间存在显著差异。聚类分析和多维标度排序无法清晰区分样本。关于贻贝，单因素方差分析表明，壳长和状况指数（干重/壳重）的平均值受月份显著影响（p<0.001）。2001年壳长和状况指数的平均值均较高。壳长趋势显示，2000年6月至7月和2002年7月至8月生长放缓，状况指数趋势显示，2000年6月和2002年7月的样本显著下降。加利福尼亚贻贝的生长可能受到黏液聚集物的负面影响，而软底大型底栖动物似乎未受到该事件的直接影响。
