Autochthonous production in shallow littoral zones of five floodplain rivers: effects of flow, turbidity and nutrients

Comparative research and generalisations in lotic ecology are challenged by the dynamic hydrology of fluvial systems. The aim of this study was to understand more fully how factors such as light, nutrients and flow can predict variation in autochthonous production and algal biomass. We measured seas...

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Bibliographic Details
Published in:Freshwater biology 2014-06, Vol.59 (6), p.1278-1293
Main Authors: Roach, Katherine A, Winemiller, Kirk O, Davis, Stephen E., III
Format: Article
Language:English
Subjects:
Algae
Animal and plant ecology
Animal, plant and microbial ecology
aquatic food webs
Biological and medical sciences
biomass production
floodplains
Fresh water ecosystems
Freshwater
Fundamental and applied biological sciences. Psychology
hydrology
littoral zone
nutrient content
nutrients
organic matter
pollution load
primary productivity
productivity
regression analysis
river
Rivers
seasonal variation
Synecology
temperature
tropics
turbidity
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Summary:Comparative research and generalisations in lotic ecology are challenged by the dynamic hydrology of fluvial systems. The aim of this study was to understand more fully how factors such as light, nutrients and flow can predict variation in autochthonous production and algal biomass. We measured seasonal changes in percent bankfull discharge, inorganic nutrient concentrations, turbidity, instream primary production, respiration and algal biomass in the littoral zone of five floodplain rivers in one temperate and two tropical regions of the Western Hemisphere. The Brazos, Guadalupe and Neches rivers are in Texas, while the Tambopata River is in Peru and the Cinaruco River in Venezuela. Our study rivers represented a range of hydrological regimes, turbidity levels and nutrient concentrations. Flooding patterns were more seasonal in the tropical rivers than in the (temperate) Texas rivers. Inorganic nutrient concentrations were higher in the temperate rivers, probably due to anthropogenic nutrient loading. Turbidity was higher following periods of high flow in the Brazos, Tambopata and Guadalupe rivers than in the Neches and Cinaruco rivers. Littoral zones in the sediment‐laden Brazos and Tambopata rivers became heterotrophic during periods of high discharge, while littoral zones in the Guadalupe, Neches and Cinaruco rivers were consistently autotrophic. Regression tree analysis suggested that algal production and biomass in the water column responded more strongly to seasonal changes in nutrients and temperature than to turbidity, while benthic algae responded more strongly to turbidity. Our findings suggest that during periods of high flow and turbidity in rivers containing fine sediments, autochthonous production is limited and terrestrial‐based organic matter may assume greater importance in the aquatic food web.
ISSN:0046-5070
1365-2427
DOI:10.1111/fwb.12347