Age, growth and radiometric age validation of a deep-sea, habitat-forming gorgonian (Primnoa resedaeformis) from the Gulf of Alaska
Age, growth and radiometric age validation of a deep-sea, habitat-forming gorgonian (Primnoa resedaeformis) from the Gulf of Alaska
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DOI：
10.1023/a:1016501320206
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发表时间：
2002-03-01
期刊：
影响因子：
2.6
通讯作者：
Heifetz, J
中科院分区：
文献类型：
--
作者：
Andrews, AH;Cordes, EE;Heifetz, J
可持续渔业需要(1)具有适当捕捞限度的可生存种群和(2)适合鱼类生存、觅食、寻求庇护、生长和繁殖的栖息地。一些深水栖息地，如由深水珊瑚礁形成的栖息地，可能容易受到捕鱼干扰。恢复栖息地的速度是渔业管理的一个关键方面。这项研究的目的是描述形成栖息地的深海珊瑚的生长速度。对阿拉斯加东南部海域采集的两个近乎完整的红树珊瑚群体(Primnoa Resedaeformis)的年龄和生长特征进行了分析。CAT扫描显示，殖民地由多个定居事件组成，其中较旧的基础结构为新殖民地的定居提供了条件。铅-210在整个菌落长度上的衰变被用来验证从生长轮计数估计的年龄。年龄估计超过100岁，靠近严重钙化的底部的部分。根据验证的生长轮计数，红树珊瑚的年生长量为1.60-2.32厘米，直径约为0.36毫米。这些增长率表明，红树珊瑚创造的渔业栖息地极易受到底层捕捞活动的影响，可能需要100多年才能恢复。
Sustainable fisheries require (1) viable stock populations with appropriate harvest limits and (2) appropriate habitat for fish to survive, forage, seek refuge, grow and reproduce. Some deep-water habitats, such as those formed by deep-water stands of coral, may be vulnerable to fishing disturbance. The rate at which habitat can be restored is a critical aspect of fishery management. The purpose of this study was to characterize growth rates for a habitat-forming deep-sea coral. Two nearly complete colonies of red tree coral (Primnoa resedaeformis) collected from waters off southeast Alaska were used for an analysis of age and growth characteristics. CAT scans revealed that colonies consisted of multiple settlement events, where older basal structures provided for settlement of new colonies. The decay of Pb-210 over the length of the colony was used to validate age estimates from growth ring counts. Age estimates were over 100 yr for sections near the heavily calcified base. Based on validated growth ring counts, growth of red tree coral ranged from 1.60 to 2.32 cm per year in height and was approximately 0.36 mm per year in diameter. These growth rates suggest that the fishery habitat created by red tree coral is extremely vulnerable to bottom fishing activities and may take over 100 years to recover.