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• W3142764752 abstract "Bohai Bay is a semi-enclosed bay,which is located in the western region of Bohai Sea in northern China. This bay has been conditioned strongly,historically,by different anthropogenic pressures. In particular,during the recent three decades,with rapid industrialization and urbanization,the seashore area of Bohai Bay were reclaim for agriculture and aquiculture,and subsequent occupation of those areas for urban,industrial and port developments have provoked a dramatic reduction in size. The seawater quality of Bohai Bay is deteriorated gradually. Due to the low movement of macroinvertebrate,they can be as a good indicator of change in their environment. In the present study,an interdisciplinary survey of hydrological,chemical and biological resources was conducted in the Bohai Bay in May 2008. The distribution of macroinvertebrate and their relation to environmental factors were performed with multivariate analysis techniques. The main aim of this study is describe the composition and abundance of macroinvertebrate and to select the best variables describing the macroinvertebrate distribution in Bohai Bay. The result shown that there were 45 taxa were observed during the study period. The highest frequency of the species is Nucula paulula,which contributed up to 77% of the stations. Planocera sp.,Protankyra bidentata and Raphidopus ciliatus were also found in more than 50% of the stations. The mean of macroinvertebrate abundance was 406 ind. / m2. The high abundance of macroinvertebrate was found at the coastal sites, while the low at the offshore sites. The highest abundance was found in the S7,with 6008 ind. / m2. However,there were not macroinvertebrate were found in the S20,where is nearly the Tianjin Port. There were three dominant species including Abrina lunella,Nucula paulula and Theora fragilis during study periods,with the dominance of 0. 02,0. 03 and 0. 22, respectively. Abrina lunella and Nucula paulula were found in most of the stations,however,Theora fragilis mainly distributed in the S7 and S8. Compared to the other investigations in the Bohai Bay,the species number,density and dominant species were significantly varied. For example,there were 122 species in the 1983,while 45 species in the present study. It is unexpected that there were 111 species in the 2011. These results indicate that there was variation in the macroinvertebrate community in Bohai Bay. This can be explained by the fact that the changes in the environmental quality of the Bohai Bay as a result of the anthropogenic pressures. Multivariate ordination techniques were used to analyze the effects of environmental variables on the macroinvertebrate community by CANOCO version 4. 5. The measured environmental factors,including water depth,water temperature,pH,salinity,dissolved oxygen,dissolved inorganic nitrogen,soluble reactive phosphorus,and silicate. All of these environmental variables were log10( x + 1) transformed before analysis except for pH. In the data matrix of species abundance,only those taxa that occurred greater than 5% of the total abundance at least in one sample were incorporated into the analysis. The species data were log10( x + 1) transformed before analysis to obtain consecutive distributions. The results of canonical correspondence analysis( CCA) with forward selection indicated that water depth( F = 1. 71,P = 0. 01),dissolved inorganic nitrogen( F = 1. 84,P = 0. 01) and dissolved oxygen( F = 1. 68,P = 0. 02),were the most important environmental factors influence macroinvertebrate assemblages during the study periods." @default.
• W3142764752 created "2021-04-13" @default.
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• W3142764752 date "2014-01-01" @default.
• W3142764752 modified "2023-09-24" @default.
• W3142764752 title "Macroinvertebrate investigation and their relation to environmental factors in Bohai Bay" @default.
• W3142764752 hasPublicationYear "2014" @default.
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