Abundance and biomass responses of microbial food web components to hydrology and environmental gradients within a floodplain of the River Danube.

Microbial Ecology
Goran Palijan

Abstract

This study investigated the relationships of time-dependent hydrological variability and selected microbial food web components. Samples were collected monthly from the Kopački Rit floodplain in Croatia, over a period of 19 months, for analysis of bacterioplankton abundance, cell size and biomass; abundance of heterotrophic nanoflagellates and nanophytoplankton; and concentration of chlorophyll a. Similar hydrological variability at different times of the year enabled partition of seasonal effects from hydrological changes on microbial community properties. The results suggested that, unlike some other studies investigating sites with different connectivity, bacterioplankton abundance, and phytoplankton abundance and biomass increased during lentic conditions. At increasing water level, nanophytoplankton showed lower sensitivity to disturbance in comparison with total phytoplankton biomass: this could prolong autotrophic conditions within the floodplain. Bacterioplankton biomass, unlike phytoplankton, was not impacted by hydrology. The bacterial biomass less affected by hydrological changes can be an important additional food component for the floodplain food web. The results also suggested a mechanism controlling bacterial cel...Continue Reading

References

Jun 1, 1986·Applied and Environmental Microbiology·P K Bjørnsen
May 13, 2006·Microbial Ecology·Vinicius F FarjallaAlex Enrich-Prast
Nov 17, 2010·Microbial Ecology·Branko VelimirovAlexander K T Kirschner
Sep 1, 1994·Microbial Ecology·D L Kirchman

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