NDLI: On the quantitative importance of heterotrophic microplankton in the northern German Wadden Sea

Content Provider	Springer Nature Link
Author	Tillmann, Urban Hesse, Karl J.
Copyright Year	1998
Abstract	To assess the importance of heterotrophic microplankton in the Wadden Sea, seasonal distribution and biomass of the main subgroups, that is, heterotrophic dinoflagellates, (separated into thecate and athecate forms), tintinnids, and aloricate ciliates, were studied in 1989 and 1990 in a total of six surveys covering the whole area of the northern German Wadden Sea. Heterotrophic microplankton biomass exhibited high spatial and temporal variation, ranging from 0 μg Cl$^{−1}$ to 66 μg Cl$^{−1}$, with maximum concentrations in spring., Mean stocks were lowest in winter (1.6 μg Cl$^{−1}$) and highest in spring (11.7 μg Cl$^{−1}$); intermediate concentrations were found in summer (8.5 μg Cl$^{−1}$). In winter, the heterotrophic microplankton was dominated by tintinnids. In spring and summer, aloricate ciliates and dinoflagellates made up the largest part of the biomass. A pronounced feature was a shift within the dinoprotist group from athecate to thecate forms in summer. In spring, maxima of athecate dinoflagellate carbon were associated with blooms ofPhaeocystis globosa, indicating a close trophic relationship. From rough estimates of the daily grazing potential, based on microheterotrophic biomass and conversion factors from the literature, it may be concluded that heterotrophic microplankton temporarily share a main role in the transfer of food and energy to higher trophic levels within the pelagic system of the Wadden Sea.
Starting Page	585
Ending Page	596
Page Count	12
File Format	PDF
ISSN	01608347
Journal	Estuaries
Volume Number	21
Issue Number	4
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-01-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Environment Ecology Geosciences Freshwater & Marine Ecology Environmental Management Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Aquatic Science Environmental Science

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