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Diffusivity in a marine macrophyte canopy: implications for submarine pollination and dispersal
1Plant Biology and, Ecology and Systematics, Cornell University, Ithaca, New York 14853-5908 USA; and.
American Journal of Botany
|June 14, 2011
Summary
Eelgrass canopies reduce particle movement, enhancing pollen capture for submarine pollination. Filamentous pollen is captured more effectively than spherical pollen within the canopy.
Area of Science:
- Marine Biology
- Oceanography
- Ecology
Background:
- Submarine pollination in seagrasses like Zostera marina (eelgrass) presents unique dispersal challenges.
- Pollen shape (spherical vs. filamentous) may influence capture efficiency in aquatic environments.
- Understanding particle transport within macrophyte canopies is crucial for ecological processes.
Purpose of the Study:
- To investigate the dispersion and capture of spherical and filamentous particles within an eelgrass bed.
- To quantify particle capture rates and diffusion characteristics under moderate flow conditions.
- To elucidate the role of eelgrass canopies in modifying fluid dynamics and facilitating pollination.
Main Methods:
- Experimental release of spherical and filamentous particles at different canopy heights.
- Measurement of particle capture rates on collectors within the Zostera marina bed.
- Estimation of horizontal (Joseph-Sendner velocity) and vertical (Gaussian diffusivity) transport parameters for filamentous particles.
Main Results:
- Particle capture rates were higher for particles released at the top of the canopy.
- Filamentous eelgrass pollen exhibited significantly greater capture rates than spherical particles.
- Estimated diffusion and diffusivity values for filamentous particles were lower than theoretical values, indicating canopy-induced flow modification.
- A high pollen-to-ovule ratio (1000-10,000 pollen/flower) is suggested for successful pollination.
Conclusions:
- Eelgrass canopies significantly alter fluid dynamics, reducing turbulent mixing and enhancing particle capture.
- The filamentous shape of eelgrass pollen is advantageous for capture within the canopy.
- These findings offer insights into the evolution of pollen morphology, submarine pollination strategies, and particle dispersal in vegetated aquatic systems.
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