Moura Carlos J
Centro de Estudos do Ambiente e do Mar (CESAM) & Departamento de Biologia, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193, Aveiro, Portugal.; Email:
Zootaxa. 2015 Jun 11;3972(2):148-80. doi: 10.11646/zootaxa.3972.2.2.
Twenty-seven species of hydroids were collected from the peaks (35-42 meters depth) of the Gorringe Bank (NE Atlantic) during the oceanographic campaign 'LusoExpedição Olympus 2008'. Twenty-one of these species are new for the Gorringe Bank that now has published records for a total of 37 hydroid species. Lafoeina tenuis, Sertularella ellisii and Clytia hemisphaerica were the most abundant hydroid species collected. Results revealed spatial differences in the composition of species assemblages along the summits of the Gorringe, as only 14 of the species sampled were found both in the Ormonde and Gettysburg seamounts. The large density of algae at the peaks of the seamounts sustain a considerable hydrozoan diversity (23 species), but visibly inhibits the establishment of hydroids to the rocky substrates (only 2 species found). All the known hydrozoan species from the peaks of the Gorringe were exclusively collected during summer, thus sampling in other seasons may reveal further hydrozoan diversity due to seasonal patterns of growth of algae and hydroids. Nevertheless, the reasonably high levels of hydrozoan biodiversity demonstrated only from a small portion the summits of the Gorringe, corroborate its seamounts as 'biodiversity hotspots'. In agreement with previous investigations with shallow-water molluscs and sponges, the shallow-water hydroid fauna of the Gorringe revealed greater biogeographical affinities with the Mediterranean and mainland Portugal. This is the first report of Eudendrium armatum outside of the Mediterranean.
在“2008年卢索探险奥林匹斯号”海洋考察期间，从戈林奇海山（东北大西洋）的山峰（深度35 - 42米）采集到了27种水螅虫。其中21种对于戈林奇海山来说是新记录，该海山目前已公布的水螅虫物种记录总数达到37种。细拉福水螅、埃氏小枝螅和半球棍螅是采集到的数量最多的水螅虫物种。结果显示，沿着戈林奇海山的山峰，物种组合的构成存在空间差异，因为在采样的物种中，只有14种在奥蒙德海山和葛底斯堡海山都被发现。海山山峰处大量的藻类维持了相当丰富的水螅虫多样性（23种），但明显抑制了水螅虫在岩石基质上的附着（仅发现2种）。戈林奇海山山峰处所有已知的水螅虫物种都是在夏季采集到的，因此在其他季节采样可能会因藻类和水螅虫的季节性生长模式而发现更多的水螅虫多样性。然而，仅从戈林奇海山一小部分山峰就展示出的相当高的水螅虫生物多样性水平，证实了其海山为“生物多样性热点地区”。与之前对浅水软体动物和海绵的调查一致，戈林奇海山的浅水水螅虫动物群与地中海和葡萄牙大陆表现出更强的生物地理亲缘关系。这是武装真枝螅在地中海以外地区的首次报道。
