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Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems
Published on: July 30, 2019
Sediment composition mediated land use effects on lowland streams ecosystems.
Paula C Dos Reis Oliveira1, Michiel H S Kraak1, Harm G van der Geest1
1FAME - Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94248, 1090 GE Amsterdam, The Netherlands.
Agricultural land use impacts lowland stream ecosystems. Runoff alters sediment composition and food quality (C/N ratio), affecting benthic invertebrates and ecosystem health.
Area of Science:
- Ecology
- Environmental Science
- Aquatic Biology
Background:
- Terrestrial and aquatic ecosystems are interconnected.
- Runoff's role in sediment composition and its impact on benthic invertebrates in lowland streams is poorly understood.
Purpose of the Study:
- Investigate how runoff influences sediment composition in lowland stream deposition zones.
- Assess the effects of altered sediment on macroinvertebrates.
Main Methods:
- Collected and chemically characterized sediment from runoff and deposition zones in forest and agricultural streams.
- Assessed biological impacts at species, community, and ecosystem levels.
Main Results:
- Sediment composition and biological responses differed significantly between forest and agricultural streams.
- Forest stream sediments had higher C/N ratios, supporting greater growth of Hyalella azteca and reproduction of Asellus aquaticus.
- Agricultural sediments showed lower mortality for chironomids and worms, with higher sediment oxygen demand.
Conclusions:
- Agricultural land use alters lowland stream deposition zones through changes in food quality (C/N ratio) and increased sediment oxygen demand.
- These changes impact stream ecosystems at multiple levels, from species to the entire ecosystem.
- Management of agricultural runoff is crucial for maintaining stream health.
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