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首页> 外文期刊>ICES Journal of Marine Science >The impacts of scallop dredging on sponge assemblages in the Gulf of Kalloni (Aegean Sea, northeastern Mediterranean)
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The impacts of scallop dredging on sponge assemblages in the Gulf of Kalloni (Aegean Sea, northeastern Mediterranean)

机译：扇贝疏on对卡洛尼湾（爱琴海，地中海东北部）的海绵组合的影响

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Concerns have been raised on the impact of bottom-fishing activities in the shallow Gulf of Kalloni (Lesvos Island, Aegean Sea). Fishing with demersal gears was banned in 1995, but the Gulf was reopened in 1998 only for scallop dredging using the "lagamna" gear. Two series of samplings were done with this gear in 1998 and 1999 (October) before the beginning of scallop-fishing period (from November up to March), aiming to investigate possible changes in sponge assemblages. Sponges (Porifera) were the most abundant meso-megafaunal benthic organisms in the Gulf, besides scallops and other bivalves. Total abundance, number of species, species diversity, species richness and evenness of sponge assemblages reduced significantly from the year 1998 to 1999. The population of the excavating Cliona celata, the only infaunal sponge species found in the Gulf, decreased. Multivariate analysis on the abundance data of epibenthic sponge species revealed a clear separation of samples collected during the 2 years, indicating changes in the structure of sponge assemblages. The distinguishing species included a variety of growth forms: massive (Mycale massa, Suberites domuncula and Tethya citrina), lobose (Suberites massa, Tedania anhelans and Halichondria panicea), erect branching (Raspailia viminalis), encrusting (Crambe crambe) and cushion-shaped (Mycale contarenii and Chondrilla nuculla) sponges. Among these species, only S. massa increased its abundance in 1999. All others decreased. No significant loss of information occurred when multivariate analysis was applied to abundance data of genera or families. This comparative study demonstrated that the time interval between two consecutive scallop-fishing periods was insufficient for the recovery of sponge assemblages. It is concluded that scallop dredging causes long-term changes in the structure and biodiversity of sponge assemblages in the Gulf of Kalloni. An improved strategy of fishery management is required in future for the conservation of living resources in this Gulf.
机译：人们对卡洛尼湾（爱琴海莱斯沃斯岛）浅海捕鱼活动的影响表示关注。 1995年禁止使用沉没渔具捕鱼，但是1998年海湾重新开放，仅使用“ lagamna”渔具进行扇贝疏ed。在该扇贝捕捞期开始之前（从11月到3月），于1998年和1999年（10月）对这种渔具进行了两次取样，目的是调查海绵组合的可能变化。除扇贝和其他双壳类动物外，海绵（Porifera）是海湾中最丰富的中大型真菌底栖生物。从1998年到1999年，海绵组合的总丰度，物种数量，物种多样性，物种丰富度和均匀度显着下降。在海湾发现的唯一臭名昭著的海绵物种Cliona celata的发掘数量减少了。对表皮海绵物种的丰度数据进行多变量分析后发现，在过去的两年中，样品的分离清晰，表明海绵组件的结构发生了变化。独特的物种包括多种生长形式：块状（Mycale massa，Suberites domuncula和Tethya citrina），球状（Suberites massa，Tedania anhelans和Halichondria panicea），直立分支（Raspailia viminalis），结壳（Crambe crambe）和垫形（Mycale contarenii和软骨小球藻）海绵。在这些物种中，只有马萨诸塞州的马球藻在1999年增加了其丰度。其他所有物种均下降了。将多变量分析应用于属或科的丰度数据时，没有发生重大信息丢失。这项比较研究表明，两个连续的扇贝捕捞期之间的时间间隔不足以恢复海绵组合。结论是，扇贝疏causes会导致卡洛尼湾海绵组合的结构和生物多样性发生长期变化。为了保护该海湾的生物资源，未来需要改进渔业管理策略。

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