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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Impact of date mussel harvesting on the rocky bottom structural complexity along the Istrian coast (Northern Adriatic, Croatia)
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Impact of date mussel harvesting on the rocky bottom structural complexity along the Istrian coast (Northern Adriatic, Croatia)

机译：贻贝收获对伊斯特拉海岸（克罗地亚北亚得里亚海）沿岸岩石底部结构复杂性的影响

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A survey of 50 km of the coast, including islands, rocks and offshore shallows, in the region of Rovinj (North Adriatic, Croatia) showed that the harvesting of the European date mussel Lithophaga lithophaga (L., 1758) is restricted to inclined, approximately vertical, surfaces. Usually, a stratum of rock, varying from several to about ten cm is removed by hammering, resulting in the complete eradication of sessile organisms. The damage was heavily widespread up to 6 m depth (47% of the total inclined surfaces for the whole area). Between 6 and 14 m depth, the damage was much less (14% from 6 to 10 and 7% from 10 to 14 m depth); below this depth, no damage was observed. The damage patterns coupled with the date mussel distribution, which was constrained by the nature of the substratum (limestone or dolomitic limestone), the general architecture of the rocky bottom and the depth. The structural complexity of inclined surfaces was quantified by 5 indices previously used in biota-substratum interaction studies. Heights of 11 pins placed 3 cm apart in a profile gauge were measured to determine the standard deviation of heights, the coefficient of variation of heights, the sum of squared heights, chain and tape ratio and circular variance of angles. Comparisons of these indices, among damaged and intact surfaces in different habitats and sites within habitats, showed a substantial decrease in complexity of the rocky substratum due date mussel harvesting. Thus, this human disturbance can permanently affect rocky shallow water communities as physical features of the substratum may exert strong effects on species.
机译：在罗维尼（克罗地亚北亚得里亚海）地区对包括岛屿，岩石和近海浅滩在内的50公里海岸进行的调查显示，欧洲枣贻贝Lithophaga lithophaga（L.，1758）的收获仅限于倾斜，大致垂直的表面。通常，锤打除去几厘米至十厘米左右的岩石层，从而完全消灭固着生物。损坏严重蔓延至6 m深度（整个区域占总倾斜表面的47％）。在6至14 m深度之间，损伤要小得多（6至10 m深度为14％，10至14 m深度为7％）。低于此深度，未观察到损坏。损害模式与枣贻贝分布有关，后者受基质（石灰岩或白云质石灰石）的性质，岩石底部的一般构造和深度的限制。斜面的结构复杂性由之前在生物群-基质相互作用研究中使用的5个指标量化。测量了在轮廓规中相距3 cm的11个销钉的高度，以确定高度的标准偏差，高度的变化系数，高度的平方，链和带的比率之和以及角度的圆形变化。在不同生境和生境中不同地点的受损和完整表面之间对这些指数进行比较，结果表明，由于贻贝收获期，岩石基质的复杂性大大降低了。因此，这种人为干扰会永久影响岩石浅水群落，因为该基质的物理特征可能会对物种产生强烈影响。

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