Floral patterns in the California current system off southern California: 1990-1996
Floral patterns in the California current system off southern California: 1990-1996
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DOI：
10.1357/002224002762341294
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发表时间：
2002
影响因子：
0.5
通讯作者：
E. Venrick
中科院分区：
文献类型：
--
作者：
E. Venrick
1990 年，CalCOFI 巡游开始例行采集样本，以清点浮游植物种类。在每次季度巡航中，来自 34 个站点的近地表样本在计数前会汇集到四个区域样本中。本文总结了该计划的前 6.5 年，旨在确定物种组成和波动的主要大规模模式。本研究共识别出 312 个物种。经常性的群体分析定义了两个主要的花簇。第一种是由富集地区特有的硅藻组成。该簇在东北地区最为丰富，并且通常在春季达到最大丰度。叶绿素变异性的百分之七十二是由这些物种的变异性造成的。第二个集群由北太平洋中部近海常见的物种组成。这些物种在研究区域具有相对较低的空间和时间变异性。没有可察觉的季节性。在这两个簇中，都无法检测到高于季节性变异、空间变异和误差的年际变异。这些模式与该地区浮游动物物种的地理模式不同，后者通常以亚北极北太平洋和过渡带的动物群为主。简要讨论了明显缺乏类似的亚北极植物群。
In 1990, CalCOFI cruises began routine collection of samples for the enumeration of phytoplank-ton species. From each quarterly cruise, nearsurface samples from 34 stations are pooled into four regional samples prior to counting. This paper summarizes the first 6.5 years of the program in order to identify major large-scale patterns of species composition and fluctuations. A total of 312 species were recognized during this study. Recurrent group analysis defines two major floral clusters. The first is composed of diatoms characteristic of enriched regions. This cluster is most abundant in the northeastern region and often attains maximum abundances in the spring. Seventy-two percent of the variability of chlorophyll is accounted for by the variability of these species. The second cluster is composed of species common in the offshore central North Pacific. These species have relatively low spatial and temporal variability in the study region. There is no detectable seasonality. In neither cluster can interannual variability be detected above seasonal variability, spatial variability and error. These patterns differ from the geographic patterns of zooplankton species in the region, which are often dominated by fauna from the subarctic North Pacific and transition zone. The apparent absence of a similar subarctic flora is briefly discussed.