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Spatial and seasonal variations of subtidal free-living nematode assemblages in the northern Beibu Gulf, South China Sea

Published online by Cambridge University Press:  03 August 2011

S.J. Fu ,
L.Z. Cai ,
J. Yang ,
X.P. Zhou ,
X. Peng  and
J. Cao
S.J. Fu
Affiliation:
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, 361005, People's Republic of China The College of Oceanography and Environmental Science, Xiamen University, Xiamen, 361005, People's Republic of China
L.Z. Cai*
Affiliation:
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, 361005, People's Republic of China The College of Oceanography and Environmental Science, Xiamen University, Xiamen, 361005, People's Republic of China
J. Yang
Affiliation:
The College of Oceanography and Environmental Science, Xiamen University, Xiamen, 361005, People's Republic of China
X.P. Zhou
Affiliation:
The College of Oceanography and Environmental Science, Xiamen University, Xiamen, 361005, People's Republic of China
X. Peng
Affiliation:
The College of Oceanography and Environmental Science, Xiamen University, Xiamen, 361005, People's Republic of China
J. Cao
Affiliation:
The College of Oceanography and Environmental Science, Xiamen University, Xiamen, 361005, People's Republic of China
*
Correspondence should be addressed to: L.Z. Cai, State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, 361005, People's Republic of China email: [email protected]
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Abstract

This study determined the spatial and seasonal density, number of genera, genera composition, maturity index and trophic structure of free-living nematode assemblages in the subtidal waters of the northern Beibu Gulf, South China Sea, and explored whether these five biotic characteristics were related to various environmental variables. Based on the data derived from samples collected seasonally at nine stations, the mean densities of nematodes decreased from alongshore to offshore station in the northern Beibu Gulf. However, the number of nematode genera increased from alongshore to offshore station. Non-parametric multidimensional scaling analysis showed no clear seasonal changes for nematode assemblages in most sampling stations. Higher densities of the genera Elzalia and Tricoma were found in offshore sampling stations, and a higher density of the genus Cheironchus was found in alongshore sampling stations. The mean percentage of each feeding type compared to the total numbers was highest in epigrowth feeders (2A), second highest in non-selective deposit feeders (1B), third highest in predators (2B), and lowest in selective deposit feeders (1A). There were significant negative correlations between nematode density and water depth and temperature; significant positive correlations between the number of nematode genera and water depth and salinity; and significant negative correlation between the maturity index of the nematode assemblage and organic matter. BIOENV analysis indicated that water depth, salinity, pH, median sediment particle size and organic matter were the most correlated combination of environmental variables affecting the nematode assemblages.

Keywords

marine nematode assemblagemeiofaunaenvironmental variablesSouth China Seanorthern Beibu Gulf
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 92 , Issue 2 , March 2012 , pp. 255 - 264
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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