Planulation periodicity, settlement preferences and growth of two deep-sea octocorals from the northwest Atlantic
Planulation periodicity, settlement preferences and growth of two deep-sea octocorals from the northwest Atlantic
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西北大西洋两种深海八珊瑚的规划周期、定居偏好和生长
DOI：
10.3354/meps08637
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发表时间：
2010
影响因子：
2.5
通讯作者：
A. Mercier
中科院分区：
文献类型：
--
作者：
Zhao Sun;J. Hamel;A. Mercier
深海珊瑚的适应性和生活史策略很少被研究。本文报道了加拿大东部半深海区2种囊壳类（刺胞类、珊瑚类）的幼虫释放时间、繁殖量、基质选择性和生长的实验室资料。种植模式在2 Drifa种显着影响的季节性生产力和月球周期，幼虫产量较大的殖民地（从较浅的深度）。在释放后，Drifa sp.的浮板改变其浮力，在底部和水柱之间移动，而D. glomerata主要是底层的，并在底层上爬行，直到沉降（通常在两个物种中发生在1至30 d之后）。定居试验表明，浮浪更容易设置- tled粗糙的自然表面覆盖的生物膜比所有其他基质测试和幼虫的殖民地从较深的栖息地比那些来自较浅的栖息地的选择性较低。在这两个物种中，8个初级肠系膜（和触手芽）出现后24小时内定居，息肉达到最大的大小后2至3个月。术后观察到第一个分支息肉。9个月的生长。在21个月的观察中，在Drifa sp.中没有检测到分支的直接证据，尽管后来在含有成虫的储存罐中发现了2-和4-息肉菌落。总之，这些发现突出了深海珊瑚的复原力（即繁殖期延长，幼虫寿命长）和脆弱性（即基质选择性，生长缓慢）的双重特征。
Adaptations and life history strategies have rarely been studied in deep-sea corals. Here we present laboratory data on the timing of larval release, reproductive output, substratum selectiv- ity and growth of 2 alcyonaceans (Cnidaria, Octocorallia) from the bathyal zone of eastern Canada. Planulation patterns in 2 Drifa species were significantly influenced by seasonal productivity and the lunar cycle, and larval output was greater in larger colonies (from shallower depths). After release, planulae of Drifa sp. shifted their buoyancy to move between the bottom and the water column, whereas planulae of D. glomerata were largely demersal and crawled on the substratum until settle- ment (typically occurring after 1 to 30 d in both species). Settlement trials showed that planulae set- tled more readily on rough natural surfaces covered with biofilm than all other substrata tested and that larvae of colonies from deeper habitats were less selective than those originating from shallower habitats. In both species, the 8 primary mesenteries (and tentacle buds) appeared within 24 h post settlement, and polyps reached a maximum size after 2 to 3 mo. The first branching polyp was observed after ca. 9 mo of growth in D. glomerata, whereas no direct evidence of branching was detected in Drifa sp. over 21 mo of observation, although 2- and 4-polyp colonies were later discov- ered in the holding tank with adults. Together, these findings highlight dual traits of resilience (i.e. extended breeding period, long-lived larvae) and vulnerability (i.e. substratum selectivity, slow growth) in deep-sea corals.
影响因子：
3.5
作者：
Heyward, AJ;Negri, AP
通讯作者：
Negri, AP