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首页> 外文期刊>Marine ecology >Population structure and conservation status of the red gorgonian Paramuricea clavata (Risso, 1826) in the Eastern Adriatic Sea
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Population structure and conservation status of the red gorgonian Paramuricea clavata (Risso, 1826) in the Eastern Adriatic Sea

机译：东亚得里亚海的红色高古猿Paramuricea clavata（Risso，1826）的种群结构和保护状况

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摘要

Gorgonians are important structuring species of the Mediterranean hard-bottom communities that are threatened by disturbances such as increasing seawater temperature, mucilaginous events and destructive fishing, among others. In this study we assessed for the first time the population structure and conservation status of one of the most common gorgonians in the Eastern Adriatic Sea, the red gorgonian Paramuricea clavata. During late spring 2009, nine populations dwelling between 30 and 50 m depth were examined by SCUBA diving along 200 km of the Croatian coastline. The density ranged between 7 and 20 colonies . m(-2). The mean and maximum colony heights were 31.2 +/- 22.7 cm (+/- SD) and 138 cm, respectively. Two main patterns of P. clavata size frequency distributions were observed: the first one with a higher proportion of juveniles (similar to 30%) observed mostly in the northernmost populations, and the second one with a higher proportion of larger colonies (>25% of colonies >40 cm in height). Regarding the disturbance impact level, the proportion of healthy colonies (with <10% of injured surface) was high in almost all of the studied populations (>60%) and the mean extent of injury (i.e. denuded axis or epibiosis) was 9.7 +/- 4% (+/- SD), indicating low impacts. Contrasting population size structures with high recruitment in mature populations provides new insights into the demographic structure of the Mediterranean gorgonian forests dwelling in their upper bathymetric range (<50 m depth). Furthermore, these size structures and the low impact levels suggest a current favorable conservation status of the studied populations in the Eastern Adriatic Sea and provide a baseline for their monitoring in the future.
机译：高加索人是地中海硬底群落的重要结构物种，它们受到诸如海水温度升高，粘液事件和破坏性捕鱼等干扰的威胁。在这项研究中，我们首次评估了亚得里亚海东部最常见的高哥氏之一红色高哥氏Paramuricea clavata的种群结构和保护状况。在2009年春末，SCUBA在克罗地亚海岸线200公里处潜水，调查了9个居住在30至50 m深度之间的种群。密度在7到20个菌落之间。 m（-2）。平均菌落高度和最大菌落高度分别为31.2 +/- 22.7 cm（+/- SD）和138 cm。观察到了虾青蟹大小频率分布的两种主要模式：第一种主要在最北端的种群中，幼鱼比例较高（约占30％），第二种较大的菌落比例较高（> 25％）高度> 40厘米的殖民地）。关于干扰影响的程度，几乎所有研究人群中健康菌落的比例（受损伤表面的<10％）都很高（> 60％），平均伤害程度（即裸露的轴或流行病）为9.7 + /-4％（+/- SD），表明影响很小。人口规模结构与成熟人口的高征兵率形成鲜明对比，这为居住在其较高测深范围（<50 m深度）的地中海戈尔戈尼亚森林的人口结构提供了新的见解。此外，这些规模的结构和较低的影响水平表明东亚得里亚海研究种群的当前保护状况良好，并为今后的监测提供了基准。

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