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Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers
Published on: May 28, 2007
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Morphological and biomechanical response to eutrophication and hydrodynamic stresses
Guorong Zhu1, Changbo Yuan2, Guilan Di3
1Donghu Experimental station of Lake Ecosystem, State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan 430072, PR China; College of Fisheries, Henan Normal University, Xinxiang 453007, PR China.
The Science of the Total Environment
|December 9, 2017
Summary
Eutrophication and water flow interact to affect aquatic plants, with hydrodynamics damaging plants in nutrient-rich waters and eutrophication harming sensitive species. Plant structure influences these biomechanical responses.
Area of Science:
- Aquatic botany
- Ecology
- Environmental science
Background:
- Eutrophication and hydrodynamics are key factors influencing aquatic macrophyte distribution.
- Limited knowledge exists on the interactive effects of eutrophication and hydrodynamics on macrophyte morphology and biomechanics.
Purpose of the Study:
- To assess the morphological and biomechanical responses of five dominant aquatic macrophyte species to combined eutrophication and hydrodynamic stresses.
- To understand how these stresses interact and influence plant survival and distribution patterns.
Main Methods:
- Sampling of five macrophyte species (Potamogeton maackianus, P. pectinatus, P. lucens, Ceratophyllum demersum, Myriophyllum spicatum) from three distinct sites in Lake Erhai, China.
- Sites varied in eutrophication levels (eutrophic, mesotrophic, meso-eutrophic) and hydrodynamic conditions (weak, moderate, strong SE wind).
- Analysis of morphological and biomechanical traits, including tensile force, tensile strain, stem cross-sectional area, plant height, and branching patterns.
Main Results:
- Significant interactive effects of eutrophication and hydrodynamics were observed on most biomechanical and some morphological traits.
- Hydrodynamics increased tensile force and strain in P. maackianus under mesotrophic conditions but decreased them in eutrophic areas, indicating mechanical failure.
- Species like P. pectinatus, C. demersum, and M. spicatum showed damage patterns related to increased hydrodynamics in eutrophic conditions.
Conclusions:
- Aquatic macrophytes exhibit biomechanical adjustments to resist combined eutrophication and hydrodynamic stresses.
- Hydrodynamic forces primarily induce mechanical damage in eutrophic macrophyte species.
- Eutrophication can trigger mechanical damage in sensitive macrophyte species, impacting their distribution and survival.
Keywords:
Canopy-forming macrophytesEutrophic lakePlant adjustmentStepwise regression analysisWater depthWind-wave disturbanceMore Related Videos
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