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首页> 外文期刊>Marine ecology progress series >Reproductive ecology and dispersal potential of varnish clam Nuttallia obscurata, a recent invader in the Northeast Pacific Ocean
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Reproductive ecology and dispersal potential of varnish clam Nuttallia obscurata, a recent invader in the Northeast Pacific Ocean

机译：东北太平洋最近入侵的清漆蛤Nu的繁殖生态学和传播潜力

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摘要

The fecundity, larval development, and temperature and salinity tolerances were determined for the varnish clam Nuttallia obscurata (Reeve 1857), a recently introduced species in the Northeast Pacific. Adult varnish clams from 2 populations were collected in British Columbia, Canada throughout the spawning season to determine sex, fecundity, and timing of spawning. Adult varnish clams were also spawned in the laboratory and the larvae reared at a range of temperatures and salinities. The highest larval growth rates were observed in the 20℃ and 20 psu treatments. Planktonic duration ranged from 3 to potentially 8 wk, with higher temperatures and salinities resulting in a shorter planktonic phase. Larvae reared at 9℃, and at 10 and 15 psu, grew slowly and survived for a minimum of 1 mo but did not reach metamorphosis. These results indicate that varnish clam larvae have a wide range of salinity and temperature tolerances, but grow optimally at warmer temperatures and higher salinities. Varnish clams have comparable larval environmental tolerances and spawning duration to co-occurring bivalves. However, their fecundity appears to be slightly higher and they reach sexual maturity earlier, potentially providing an advantage in establishing new populations. The lengthy planktonic phase, combined with favourable oceanographic circulation patterns, has contributed to the rapid dispersal and geographic range expansion of the varnish clam in the Northeast Pacific.
机译：确定了清漆蛤introducedNuttallia obscurata（里夫1857年）的繁殖力，幼虫发育以及温度和盐分的耐受性，这是东北太平洋最近引进的一种。在整个产卵季节，从加拿大不列颠哥伦比亚省采集了来自2个种群的成年蛤，以确定其性别，繁殖力和产卵时间。在实验室中还产生了成年的蛤c，并在一定温度和盐度下饲养了幼虫。在20℃和20 psu处理下，幼虫的生长速率最高。浮游生物的持续时间为3至8 wk，温度和盐度较高，导致浮游期较短。幼虫在9℃，10和15 psu下饲养，生长缓慢，存活至少1 mo，但未达到变态。这些结果表明，清漆蛤仔幼虫具有广泛的盐度和温度耐受性，但在温度较高和盐度较高时生长最佳。清漆蛤的幼虫环境耐受性和产卵持续时间可与同时出现的双壳贝类似。但是，它们的繁殖力似乎略高一些，并且较早达到性成熟，可能在建立新人群方面具有优势。漫长的浮游期，加上有利的海洋环流模式，促进了东北太平洋清漆蛤的快速扩散和地理范围的扩大。

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