A preliminary study of tintinnid diversity in the NW Mediterranean Sea |
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Authors: | Cariou J; Dolan J; Dallot S |
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Institution: | University Paris VI, CNRS ESA 7076, Marine Microbial Ecology Research Group, Station Zoologique, BP 28, F-06230 Villefranche-Sur-Mer, France; Corresponding author |
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Abstract: | Tintinnid diversity in surface waters was investigated in the Bay of
Villefranche in March, before the formation of the seasonal thermocline,
and in May, following water column stratification. Tintinnid abundance was
much greater in March (500 cells l-1), corresponding
to a bloom of Stensomella nivalis compared to May (30
cells l-1). Nonetheless, high numbers of species
were encountered on both dates: 32 in March and 39 in May, respectively.
Diversity was higher (H2.5) for the May
date with low tintinnid concentrations. We examined taxonomic diversity and
morphological diversity. Variance of lorica length was correlated with
taxonomic diversity, in contrast to variance of lorica diameter, which was
nearly invariant. We suggest that either species with similar lorica
diameters exploit different prey items or competition for prey items is not
the dominant factor in structuring tintinnid communities.
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