NDLI: Seasonal dynamics of aggregates and their typical biocoenosis in the Elbe Estuary

Content Provider	Springer Nature Link
Author	Zimmermann Timm, Heike Holst, Henry Müller, Stefan
Copyright Year	1998
Abstract	In 1995, an extensive investigation was carried out in the Elbe Estuary in Germany. Special attention was paid to organisms, including bacteria, amoebae, ciliates, flagellates, rotifers, larvae ofDreissena polymorpha, and nematodes, dispersed in the water column and associated firmly or loosely with different types of aggregates. The abundance, size, and colonization by microorganisms of the aggregates varied during the seasons. The largest aggregates were found during spring and summer, when diatoms, rotifers, and crustaceans were present. The most aggregates were encountered in spring and from summer to autumn. Most of the species observed during the study were more common in pelagic habitats than in benthic ones. However, the presence of ciliates in the groups Hypotrichida and Sessilida as well as as flagellates in the groups Biosoecida, Cercomonadida, Choanoflagellida, Chrysomonadida, Kinetoplastida, and amoebae and some nematodes in the open water depends, upon the availability of surfaces, because they are sessile or poor swimnters, and some flagellates and amoebae need to attach themselves to an object to feed. Most organisms were much more abundant in or on aggregates than in the surrounding water during spring and summer, which indicates that aggregates enhance the habitat and promote the development of the organisms. From spring through autumn, the structure of the community associated with the aggregates is influenced by the pelagic environment. The presence of the species in the benthic community was detected only during summer.
Starting Page	613
Ending Page	621
Page Count	9
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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