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09:04
Yeast Colony Embedding Method
Published on: March 22, 2011
Phylogenetic relatedness predicts priority effects in nectar yeast communities
Kabir G Peay1, Melinda Belisle, Tadashi Fukami
1Department of Biology, Stanford University, 371 Serra Mall, Stanford, CA 94305, USA.
Proceedings. Biological Sciences
|July 22, 2011
Summary
Priority effects, where arrival order influences species interactions, are common. Closer relatives showed stronger priority effects due to intense competition, impacting community assembly.
Area of Science:
- Ecology
- Community Ecology
- Microbial Ecology
Background:
- Priority effects are crucial in community assembly models, but their variation and drivers are poorly understood.
- Understanding how arrival order influences species interactions is key to predicting community composition.
- The strength of priority effects can differ significantly among species within a community.
Purpose of the Study:
- To quantify the strength of priority effects among yeast species in a model natural community.
- To investigate the factors, particularly phylogenetic relatedness, that explain variation in priority effect strength.
- To test the hypothesis that ecological similarity drives variation in priority effects.
Main Methods:
- Conducted laboratory microcosm experiments using yeast species from hummingbird-pollinated shrub nectar.
- Quantified priority effect strength by assessing the impact of early-arriving species on late-arriving species.
- Analyzed carbon and amino acid consumption profiles to assess ecological similarity and competition intensity.
Main Results:
- Priority effects were widespread, with early-arriving yeast species negatively impacting late-arriving species.
- The magnitude of priority effects varied significantly across different species pairs.
- Stronger priority effects were observed between more closely related yeast species.
- Intense competition, driven by high ecological similarity, was evident between related species.
Conclusions:
- Phylogenetic relatedness is a significant factor explaining the variation in priority effect strength.
- Ecological similarity, as predicted by Darwin's naturalization hypothesis, drives competition intensity and priority effects.
- Community assembly is historically contingent, with phylogenetic relationships shaping species interactions and outcomes.
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