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A habitat colonisation model for spore-dispersed organisms: does it work with eumycetozoans?
Martin Schnittler1, Jens Tesmer
1University of Greifswald, Institute of Botany and Landscape Ecology, Greifswald, Germany. martin.schnittler@uni-greifswald.de
Mycological Research
|May 23, 2008
Summary
Eumycetozoan spore productivity varies greatly, with sexual species requiring higher spore rain for colonization than asexual ones. These findings align with evolutionary predictions for spore production and reproduction strategies.
Area of Science:
- Mycology
- Ecology
- Evolutionary Biology
Background:
- Eumycetozoans, including protostelids and myxomycetes, exhibit diverse spore productivities and colonization strategies.
- Understanding spore establishment is crucial for predicting population dynamics and ecological success.
Purpose of the Study:
- To estimate and compare spore productivities and establishment probabilities of eumycetozoans.
- To develop and validate a colonization model for predicting species frequencies.
- To investigate the influence of reproductive systems on spore rain requirements.
Main Methods:
- Quantitative analysis of spore numbers and sizes from cultures and field surveys.
- Calculation of spore numbers per fructification based on dimensions.
- Development of a colonization model estimating habitat island colonization frequencies.
Main Results:
- Spore numbers per spore case range from 1-4 in protostelids to 10^5-10^6 in myxomycetes.
- Average spore size decreases from 14.8 microm (protostelids) to 10.3 microm (myxomycetes).
- Sexual species require a 2.4-fold higher minimum spore rain for 50% colonization frequency compared to asexual species.
Conclusions:
- Eumycetozoan spore production and colonization dynamics align with theoretical evolutionary predictions.
- Sexual reproduction in eumycetozoans is associated with higher spore output and specific establishment requirements.
- Observed evolutionary trends include increased spore production in sexual species and occasional shifts between sexual and asexual reproduction.
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