Characteristics and regional classification of the copepod community in Ariake Bay with note on comparison with 3 decades ago |
| |
| Authors: | Roberta Beltrão Michiko Monde Hiroshi Ueda |
| |
| Institution: | (1) Usa Marine Biological Institute, Kochi University, 194 Inoshiri, Usa, Tosa Kochi, 781-1164, Japan;(2) Graduate School of Science and Engineering, Ehime University, Matsuyama Ehime, 790-8577, Japan; |
| |
| Abstract: | Ariake Bay, Kyushu Island, has recently exhibited environmental degradation in the form of red tides and anoxic bottom water.
To determine the characteristics and regional classification of the copepod community, zooplankton surveys were made throughout
the bay in three cruises each in October 2004, January 2005 and March 2009 by vertical tows of a 0.1-mm-mesh plankton net.
Oithona davisae was the most abundant in January and March, and Microsetella norvegica in October. Cluster analysis revealed that the copepod community from each cruise was generally separated into the inner
to eastern-middle region and the western-middle to mouth region. A SIMPER analysis revealed that dissimilarity between the
groups and similarity within each group were mainly due to the dominant species, but the similarities within the outer-region
group in January and March were mostly contributed by Paracalanus parvus s.l. A non-metric multidimensional scaling with bubble plots of environmental variables and a BIOENV analysis showed that
transparency was more different between the two groups than temperature and salinity. As compared with two similarly sized,
eutrophic bays (Tokyo and Osaka Bays), Ariake Bay differs from Tokyo Bay in the dominance of M. norvegica and from Osaka Bay in the high abundance of O. davisae even in the colder season. The dominant species and the regional classification of the copepod community in the bay were
similar to those in the studies in the 1970s, suggesting that the copepod community has not notably changed during the last
3 decades. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
