Epifaunal community structure associated with Riftia pachyptila aggregations in chemically different hydrothermal vent habitats
Epifaunal community structure associated with Riftia pachyptila aggregations in chemically different hydrothermal vent habitats
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DOI：
10.3354/meps305067
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发表时间：
2005-01-01
影响因子：
2.5
通讯作者：
Fisher, CR
中科院分区：
文献类型：
--
作者：
Govenar, B;Le Bris, N;Fisher, CR
在东太平洋海隆的低温热液喷口，vstientiferan管虫Riftia pachyptila(多毛目：西博林科)经常在早期演替阶段和高生产力栖息地占据主导地位。我们分别于2001年12月和2002年12月在两个分散的热液扩散点采集了8个厚皮轮虫及其相关的附生植物群落。由于与热液喷口活动有关的生物和非生物因素具有很高的时空变异性，因此在不同地点之间1年或500m距离的尺度上，群落的结构和组成可能会出现显著差异。尽管两个地点的环境条件有很大的不同，但两个地点或年份之间的扩散流温度范围没有显著差异。在1个地点(里夫蒂亚场)，扩散的热液具有相对较低的硫化物浓度、低pH值和较高的铁浓度。在另一个地点(Tica)，扩散的热液具有较高的硫化物浓度，pH更接近中性，铁是无法检测到的。粗面红曲霉的生理状态似乎反映了硫化物在每个部位的有效性。然而，除了少数种类外，表层动物群落的结构和组成在不同地点和年份之间非常相似。在不同的热液喷口生境中，厚朴红藻的聚集支持了相对于周围海底的高度的当地物种多样性和高度的群落相似性。
The vestimentiferan tubeworm Riftia pachyptila (Polychaeta: Sibloglinidae) often dominates early succession stages and high productivity habitats at low-temperature hydrothermal vents on the East Pacific Rise. We collected 8 aggregations of R. pachyptila and the associated epifaunal community at 2 discrete sites of diffuse hydrothermal activity, in December 2001 and December 2002. Because of the high spatial and temporal variability of the biotic and abiotic factors related to hydrothermal vent activity, significant differences in the structure and the composition of the community were expected to occur at the scale of either 1 yr or 500 m distance between very different sites. There was no significant difference in the temperature ranges of the diffuse flow between sites or years, even though the environmental conditions were very different at the 2 sites. At 1 site (Riftia Field), the diffuse hydrothermal fluids had relatively low concentrations of sulfide, low pH, and high concentrations of iron. At the other site (Tica), the diffuse hydrothermal fluids had higher sulfide concentrations, the pH was closer to neutral, and iron was undetectable. The physiological condition of R. pachyptila appeared to reflect the availability of sulfide at each site. However, the structure and the composition of the epifaunal community were remarkably similar between sites and years, with the exception of a few species. Aggregations of R. pachyptila support high local species diversity relative to the surrounding seafloor and high community similarity in different hydrothermal vent habitats.