Temporal and vertical distributions of three appendicularian species (Tunicata) in Conception Bay, Newfoundland
Temporal and vertical distributions of three appendicularian species (Tunicata) in Conception Bay, Newfoundland
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纽芬兰康塞普申湾三种阑尾类物种（Tunicata）的时间和垂直分布
DOI：
10.1093/plankt/fbn064
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发表时间：
2008
影响因子：
2.1
通讯作者：
D. Deibel
中科院分区：
文献类型：
--
作者：
N. Choe;D. Deibel
为了确定北方附属物物种Oikopleura vanhoeffeni、北方贝母和拉布拉多里贝母在纽芬兰概念湾的时间和垂直分布，以确定它们是否具有相同的环境生态位，对它们进行了为期1年的观测。在春季叶绿素a浓度达到最大值后，3种藻类的总生物量达到最大值，说明附着体的丰度一般与浮游植物的生物量有关。三个物种的季节高峰丰度在时间上并不重叠。随着上层混合层温度的升高和盐度的降低，北方沼虾在7、8月份达到最大值，拉布拉多里对虾在盐度年最低的10月份达到最大值。不同物种的垂直分布也不同。Oikopleura vanhoeffeni主要发生在表层以下，夏季停留在温跃层以下。北极扇贝的垂直分布与观测到的环境变量无关，而拉布拉多里赤潮虾主要发生在盐度最低的深处。根据温度和盐度，每个物种都显示出不同的生态位。北方管藻是一种具有狭温和狭盐生态位的嗜冷者，北方管藻和拉布拉多里管藻是一种中温和中盐生态位。这些结果表明了这三个共域的北极附属物物种之间的物理生态位分离，并提供了信息，根据这些信息，可以根据可能的气候变化预测它们的丰度和空间分布的未来变化。
Temporal and vertical distributions of the boreal appendicularian species Oikopleura vanhoeffeni, Fritillaria borealis and O. labradoriensis were observed in Conception Bay, Newfoundland, over a 1-year period in order to determine whether they share the same environmental niche. Total abun- dance of the three species together peaked after the spring maximum of chlorophyll a concentration, indicating that appendicularian abundance was generally related to the biomass of phytoplankton. The seasonal peak abundance of the three species did not overlap in time. The maximum abun- dance of O. vanhoeffeni occurred in May and June during the spring phytoplankton bloom, that of F. borealis occurred in July and August as upper mixed layer temperature increased and salinity decreased and that of O. labradoriensis occurred in October when salinity was at its annual minimum. Vertical distribution also differed among the species. Oikopleura vanhoeffeni occurred primarily below the surface layer and remained below the thermocline in summer. The vertical distribution of F. borealis was not correlated with the observed environmental variables, whereas O. labradoriensis occurred primarily at depths of minimum salinity. Each species displayed a distinct niche based on temperature and salinity. Oikopleura vanhoeffeni was a cryophile with a stenothermal and stenohaline niche, F. borealis was eurythermic and euryhaline and O. labradoriensis inhabited a mesothermal and mesohaline niche. These results indicate physical niche separation among these three sympatric, arcto-boreal appendicularian species and provide information from which future changes in their abundance and spatial distribution can be predicted given likely climatic variation.