Bathymetric and temporal variation among Osedax boneworms and associated megafauna on whale-falls in Monterey Bay, California
Bathymetric and temporal variation among Osedax boneworms and associated megafauna on whale-falls in Monterey Bay, California
复制标题
DOI：
10.1016/j.dsr.2007.05.014
复制
发表时间：
2007-10-01
影响因子：
2.4
通讯作者：
Vrijenhoek, Robert C.
中科院分区：
文献类型：
--
作者：
Braby, Caren E.;Rouse, Greg W.;Vrijenhoek, Robert C.
2002年在加州蒙特雷湾2893米深处发现了一个天然的鲸鱼瀑布，导致了Osedax的描述，Osedax是一种新的食骨蠕虫属（环节动物：Siboglinidae）。Osedax通过分叉的根部获得营养，这些根部承载共生细菌并消耗鲸鱼骨头。为了评估这些不寻常的蠕虫的水深范围和它们在鲸鱼瀑布社区演替中的作用，我们在蒙特雷海底峡谷的三个额外的深度（1820，1018和385米）沉没搁浅的鲸鱼尸体。四个沉没的尸体经历了不同的温度，氧气，和干扰制度，并主办巨型动物群落，不同的物种多样性和组成。然而，在所有四个地点都发现了Osedax，分子分析使我们能够将它们分配给六个不同的物种，其中四个是科学上的新物种。以前已知的物种，O. rubipulumus（1820-2893 m）和O. frankpressi（2893米），被发现低于氧气最低区。其中一个新物种似乎是一个晚期演替物种，在2893米的鲸鱼瀑布攻击沉积物覆盖的骨头碎片。其他新物种出现在较浅的鲸鱼瀑布，这是在缺氧的水。一个是在1018米鲸鱼瀑布的早期殖民者，两个发生在385米鲸鱼瀑布。密集的Osedax人口在1018米的鲸鱼瀑布导致鲸鱼骨骼的快速降解，而稀疏的Osedax人口与缓慢的降解在385米的鲸鱼瀑布。因此，我们假设Osedax可能是蒙特雷鲸鱼瀑布社区的基础物种，调节鲸鱼骨骼的寿命，从而影响相关巨型动物的演替。(C)2007爱思唯尔有限公司版权所有。
The discovery in 2002 of a natural whale-fall at 2893 m depth in Monterey Bay, California, led to the description of Osedax, a novel genus of bone-eating worms (Annelida: Siboglinidae). Osedax obtain their nutrition via ramifying roots that host symbiotic bacteria and consume whale bones. To assess the bathymetric range of these unusual worms and their role in whale-fall community succession, we sank beached whale carcasses at three additional depths (1820, 1018, and 385m) in the Monterey Submarine Canyon. The four sunken carcasses experienced different temperature, oxygen, and disturbance regimes and hosted megafaunal communities that differed in both species diversity and composition. However, Osedax were found at all four sites, and molecular analyses allowed us to assign them to six distinct species, four of which are new to science. The previously known species, O. rubiplumus (1820-2893 m) and O. frankpressi (2893 m), were found below the oxygen minimum zone. One of the new species appears to be a late successional species that attacks sediment-covered bone fragments at the 2893-m whale-fall. The other new species occur at the shallower whale-falls, which are in oxygen-poor water. One is an early colonizer at the 1018-m whale-fall, and two occur at the 385-m whale-fall. Dense Osedax populations at the 1018-m whale-fall led to rapid degradation of whale bones, whereas sparse Osedax populations were associated with slow degradation at the 385-m whale-fall. Thus, we hypothesize that Osedax may be a foundation species in Monterey whale-fall communities, regulating the longevity of whale bones and thereby affecting the succession of associated megafauna. (C) 2007 Elsevier Ltd. All rights reserved.