San Francisco Estuary Institute, 4911 Central Avenue, Richmond, CA 94804, USA.
Environ Monit Assess. 2013 Mar;185(3):2281-95. doi: 10.1007/s10661-012-2708-8. Epub 2012 Jun 12.
The spatial and temporal distribution of macrobenthic assemblages in the San Francisco Estuary and Sacramento-San Joaquin River Delta were identified using hierarchical cluster analysis of 501 samples collected between 1994 and 2008. Five benthic assemblages were identified that were distributed primarily along the salinity gradient: (1) a polyhaline assemblage that inhabits the Central Bay, (2) a mesohaline assemblage that inhabits South Bay and San Pablo Bay, (3) a low-diversity oligohaline assemblage primarily in Suisun Bay, (4) a low-diversity sand assemblage that occurs at various locations throughout the Estuary, and (5) a tidal freshwater assemblage in the Delta. Most sites were classified within the same assemblage in different seasons and years, but a few sites switched assemblage designations in response to seasonal changes in salinity from freshwater inflows.
采用层次聚类分析方法，对 1994 年至 2008 年间采集的 501 个样本进行分析，确定了旧金山湾和萨克拉门托-圣华金河三角洲大型底栖生物组合的时空分布。共确定了 5 个底栖生物组合，主要沿盐度梯度分布：（1）栖息在中央湾的多盐组合，（2）栖息在南湾和圣巴勃罗湾的中盐组合，（3）主要在苏西恩湾的低多样性寡盐组合，（4）在河口各处出现的低多样性沙质组合，以及（5）三角洲的潮汐淡水组合。大多数站点在不同季节和年份都被归类为同一组合，但也有一些站点因淡水流入导致盐度季节性变化而改变了组合名称。
