文章基本信息

标题：Selectivity of plankton nets over mesozooplankton taxa: implications for abundance, biomass and diversity estimation
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作者：Nicoletta RICCARDI
期刊名称：Journal of limnology
印刷版ISSN：1129-5767
电子版ISSN：1723-8633
出版年度：2010
卷号：69
期号：2
页码：287-296
DOI：10.4081/jlimnol.2010.287
出版社：Istituto italiano di idrobiologia
摘要：The importance of the smaller copepod species is often underestimated as a result of the use of standard 200 μm mesh size nets, even though the small copepods probably represent the dominant component of the mesozooplankton community.Although the inadequacy of relatively coarse nets in providing reliable descriptions of the mesozooplankton assemblage is increasingly welldocumented, such nets continue to be commonly used.A major reason for this unwillingness to break with tradition is the belief that samples remain comparable even though the absolute values are biased.A one-year study of the abundance and size distribution of zooplankton collected in the Venice Lagoon using an 80 μm mesh size net showed an overwhelming abundance of small taxa.These data were used to derive estimates of the mesh selection effects of standard WP-2 nets on zooplankton abundance and biomass.Only 11% of numbers and 54% of biomass of lagoon zooplankton are likely to be caught with standard WP-2 nets.A comparison of seasonal changes in diversity, estimated from the fine and coarse datasets, confirmed that retention efficiency is seasonally dependent, which results in serious implications when extrapolating temporal patterns in community structure from WP-2 mesozooplankton counts.
关键词：mesh selection; abundance; biomass; species diversity