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Alteration in microcrustacean secondary production and herbivory effects between the River Danube and its floodplain lake
- Source :
- Hydrobiologia. 836:185-196
- Publication Year :
- 2019
- Publisher :
- Springer Science and Business Media LLC, 2019.
-
Abstract
- The aim of this study was to determine microcrustacean secondary production (P/B) and a herbivory ratio (ZB:PB) in the River Danube and a floodplain lake to reveal models in plankton food web functioning. P/B was used to assess population variation under different environmental conditions, while ZB:PB provided information on the zooplankton grazing intensity on algae. Seasonal changes, displayed by the hydrological regime, i.e., related water level fluctuation, were expected to explain different plankton patterns between the study sites as a result of unlike community composition and food quality. The structural equation modelling we used identified specific pathways of measured indexes at the individual localities. Although the direct impact of water level fluctuation on the studied communities was low, the following difference in abiotic components might have caused shifts in zooplankton assemblages that changed P/B and ZB:PB ratios. In the floodplain lake, P/B was primarily influenced by biotic components, and herbivory alteration was expressed through top-down control. On the contrary, P/B in the riverine system was controlled by an environmental element and herbivory was driven by the bottom-up resources. The results show the usefulness of the studied indexes in determining variations of zooplankton functional processes in the hydrologically dynamic environments.
- Subjects :
- 0106 biological sciences
Abiotic component
geography
Herbivore
geography.geographical_feature_category
Biotic component
Floodplain
biology
Ecology
010604 marine biology & hydrobiology
Aquatic Science
Plankton
biology.organism_classification
010603 evolutionary biology
01 natural sciences
Zooplankton
Food web
Algae
Cladocera
Copepoda
Floodplain lake
P/B ratio
ZB:PB
SEM
Environmental science
Subjects
Details
- ISSN :
- 15735117 and 00188158
- Volume :
- 836
- Database :
- OpenAIRE
- Journal :
- Hydrobiologia
- Accession number :
- edsair.doi.dedup.....9ced71d970f4225721ae39229e8dacd1