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DatoValore
TitleSelectivity of plankton nets over mesozooplankton taxa: implications for abundance, biomass and diversity estimation
AbstractThe importance of the smaller copepod species is often underestimated as a result of the use of standard 200 ¼m 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 ¼m 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.
SourceJournal of limnology (Testo stamp.) 69 (2), pp. 287–296
Keywordsmesh selectionabundancebiomassspecies diversity
JournalJournal of limnology (Testo stamp.)
EditorIstituto per lo Studio degli Ecosistemi., Verbania Pallanza, Italia
Year2010
TypeArticolo in rivista
DOI10.3274/JL10-69-2-10
AuthorsRiccardi N.
Text53167 2010 10.3274/JL10 69 2 10 ISI Web of Science WOS 000282859700010 mesh selection abundance biomass species diversity Selectivity of plankton nets over mesozooplankton taxa implications for abundance, biomass and diversity estimation Riccardi N. CNR Istituto per lo Studio degli Ecosistemi. Verbania Pallanza The importance of the smaller copepod species is often underestimated as a result of the use of standard 200 ¼m 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 ¼m 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. 69 Articolo pubblicato Riccardi_2010.pdf Articolo in rivista Istituto per lo Studio degli Ecosistemi. 1129 5767 Journal of limnology Testo stamp. Journal of limnology Testo stamp. J. limnol. Testo stamp. Journal of limnology. Testo stamp. nicolettarita.riccardi RICCARDI NICOLETTA RITA TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici