Impacts associated with the recent range shift of the aeolid nudibranch Phidiana hiltoni (Mollusca, Opisthobranchia) in California.
Impacts associated with the recent range shift of the aeolid nudibranch Phidiana hiltoni (Mollusca, Opisthobranchia) in California.
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DOI：
10.1007/s00227-011-1633-7
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发表时间：
2011
期刊：
影响因子：
2.4
通讯作者：
Pearse, John S.
中科院分区：
文献类型：
--
作者：
Goddard, Jeffrey H. R.;Gosliner, Terrence M.;Pearse, John S.
1977年，菲黛安娜·希尔顿（O 'Donoghue In J. Entomol Zool（波莫纳学院，克莱蒙特，加利福尼亚州）19:77-119）开始从加利福尼亚州蒙特雷向北传播。到1992年，它已经到达了达克斯伯里礁（37°53 ' 23″N, 122°41 ' 59″W），向北100公里，在那里其他裸鳃动物的数量随后出现下降。通过饲料分析、饲养试验以及历史和最近丰度数据的比较，研究了希氏单胞杆菌在这种下降中的作用。在野外，P. hiltoni主要捕食水螅类动物，但也有证据表明它们捕食裸鳃动物。在实验室中，希氏假单胞菌会攻击呈现在它面前的大多数树突和固体无触目生物，将小的个体整个吞下。在达克斯伯里礁，易受希尔顿双歧杆菌攻击的裸鳃动物的总丰度自到达以来平均下降了三分之二，相比之下：(1)非易受攻击的物种没有变化，(2)在希尔顿双歧杆菌数量少一到两个数量级的其他两个地点，两组都没有变化。因此，菲黛安娜·希尔托尼似乎导致了这种衰退，可能是通过直接捕食和争夺猎物的结合。短暂的幼虫期，再加上雷耶斯角背风处的气旋再循环，可能会促使达克斯伯里礁的P. hiltoni自我繁殖，并阻碍其进一步向北扩散。本文的在线版本（doi:10.1007/s00227-011-1633-7）包含补充材料，仅供授权用户使用。
In 1977, Phidiana hiltoni (O’Donoghue in J. Entomol Zool (Pomona College, Claremont, California) 19:77–119,) began spreading northward from Monterey, California. By 1992, it had reached Duxbury Reef (37° 53′ 23″ N, 122° 41′ 59″ W), 100 km to the north, where other nudibranchs subsequently appeared to decline. The role of P. hiltoni in this decline was investigated through diet analysis, feeding trials, and comparison of historical and recent abundance data. In the wild, P. hiltoni preyed largely on hydroids, but also showed evidence of predation on nudibranchs. In the laboratory, P. hiltoni attacked most of the dendronotid and aeolid nudibranchs presented to it, ingesting small individuals whole. The pooled abundance of nudibranchs vulnerable to attack by P. hiltoni declined an average of two-thirds at Duxbury Reef since its arrival, compared to (1) no change in the non-vulnerable species and (2) no change in either group at two other sites where P. hiltoni was one to two orders of magnitude less abundant. Phidiana hiltoni therefore appears to have caused this decline, likely through a combination of direct predation and competition for prey. A brief larval period, combined with cyclonic re-circulation in the lee of Point Reyes, may be driving self-recruitment of P. hiltoni at Duxbury Reef, as well as hindering further northward spread. The online version of this article (doi:10.1007/s00227-011-1633-7) contains supplementary material, which is available to authorized users.
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