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Local genetic structure in a clonal dioecious angiosperm.
M V Ruggiero1, T B H Reusch, G Procaccini
1Laboratorio di Ecologia del Benthos, Stazione Zoologica Anton Dohrn, 80077 Ischia (Naples), Italy. ruggiero@szn.it
Molecular Ecology
|March 19, 2005
Summary
Genetic diversity in seagrass (Cymodocea nodosa) is high and evenly distributed across meadows, despite limited seed dispersal. This indicates effective vegetative spread maintains genetic structure at various scales.
Area of Science:
- Marine Botany
- Population Genetics
- Ecology
Background:
- Seagrasses like Cymodocea nodosa are crucial marine ecosystem engineers.
- Understanding their genetic structure is vital for conservation and management.
- C. nodosa reproduces sexually and asexually via rhizomes, with limited seed dispersal.
Purpose of the Study:
- To analyze the genetic structure and clonal architecture of a Cymodocea nodosa population.
- To investigate genetic diversity at spatial scales ranging from meters to centimeters.
- To assess the impact of limited seed dispersal on population genetics.
Main Methods:
- Utilized seven microsatellite loci for genetic analysis.
- Characterized genetic structure and clonal architecture across multiple spatial scales.
- Employed autocorrelation analyses of kinship estimates.
Main Results:
- Found high clonal diversity, with up to 67% distinct genotypes.
- Observed a highly intermingled configuration of genets at all spatial scales.
- Confirmed even distribution of genetic diversity throughout the meadow.
- Demonstrated very restricted seed dispersal, with an observed range of 1-21 meters.
Conclusions:
- Cymodocea nodosa populations exhibit significant clonal diversity and intermingled genets.
- Genetic diversity is uniformly distributed, irrespective of spatial scale.
- Vegetative propagation plays a key role in maintaining genetic structure due to limited seed dispersal.