Population structure of the protected fan mussel Pinna nobilis in the south Aegean Sea (eastern Mediterranean)
Population structure of the protected fan mussel Pinna nobilis in the south Aegean Sea (eastern Mediterranean)
复制标题
爱琴海南部（地中海东部）受保护扇贝 Pinna nobilis 的种群结构
DOI：
10.1017/s0025315413001902
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发表时间：
2014
影响因子：
1.2
通讯作者：
C. Chintiroglou
中科院分区：
文献类型：
--
作者：
D. Vafidis;C. Antoniadou;E. Voultsiadou;C. Chintiroglou
紫罗兰是地中海特有物种，具有重要的经济和文化价值。如今，它受到了严格的保护，因为人们认识到，由于渔业和栖息地退化的综合影响，它的数量急剧下降。这项研究试图通过非破坏性抽样，评估爱琴海南部(十二岛复合体)诺氏对虾种群的现状，在那里，他们几个世纪以来一直受到几乎不受控制的捕捞的影响。种群密度和个体总长度是通过沿6个岛屿的带状横断面潜水估计的。每个岛屿随机选择两个站点，每个站点测量两个深度区。此外，2004年3月至2006年6月在阿斯特帕莱亚岛进行了时间抽样，以评估个体密度和人口规模结构的相关趋势。在现场测量了1372个个体，以估计最大壳长。所研究的种群在浅水区和避难所的密度增加；小尺度的环境制度被认为是影响青海对虾分布的因素。在一年中的寒冷时期，密度也有所增加，这可能与招聘成功有关。在深度较低的区域，褐飞虱种群由较大的个体组成。2004年12月，随着平均体长变小，体型在时间上显著减少；在同一个月，体型-频率分布左移描述了小型幼体的存在。这些观察结果可能与该物种的生殖生物学有关。
Pinna nobilis is an endemic Mediterranean species of high economic and cultural importance. Nowadays, it is under strict protection as a dramatic decline in its populations has been recognized, assigned to the combined effect of fisheries and habitat degradation. This study attempts to evaluate, by non-destructive sampling, the current status of P. nobilis populations in the south Aegean Sea (Dodecanese island complex), where they have been affected for centuries by practically uncontrolled harvesting. Population density and total length of individuals was estimated by diving along strip transects at six islands. Two stations were randomly selected per island, and two depth zones were surveyed per station. Additionally, temporal sampling was carried out at Astypalaia Island from March 2004 to June 2006, to assess relevant trends in density of individuals and size structure of the population. In total 1372 P. nobilis individuals were measured in situ to estimate maximum shell length. The studied populations showed increased density in the shallower depth zone and sheltered sites; small-scale environmental regimes are proposed as shaping factors of P. nobilis distribution. Increased density was also detected during the cold period of the year, probably related to recruitment success. In the lower depth zone the P. nobilis population consisted of larger individuals. A significant decrease in size was detected temporally as mean length was smaller in December 2004; in the same month the presence of small-sized juveniles was depicted in a left-shift in size–frequency distribution. These observations are probably related to the reproductive biology of the species.