A Refined Methodology for Defining Plant Communities Using Postagricultural Data from the Neotropics

How best to define and quantify plant communities was investigated using long-term plot data sampled from a recovering pasture in Puerto Rico and abandoned sugarcane and banana plantations in Ecuador. Significant positive associations between pairs of old field species were first computed and then c...

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Bibliographic Details
Published in:TheScientificWorld 2012-01, Vol.2012 (2012), p.1-9
Main Author: Myster, Randall W.
Format: Article
Language:English
Subjects:
Abandonment
Agriculture
Banana
Biodiversity
Clustering
Cultivation
Fruit cultivation
Methods
Old fields
Pasture
Plant communities
Plantations
Plants - classification
Saccharum officinarum
Species
Sugarcane
Tolerances
Tropical Climate
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Summary:How best to define and quantify plant communities was investigated using long-term plot data sampled from a recovering pasture in Puerto Rico and abandoned sugarcane and banana plantations in Ecuador. Significant positive associations between pairs of old field species were first computed and then clustered together into larger and larger species groups. I found that (1) no pasture or plantation had more than 5% of the possible significant positive associations, (2) clustering metrics showed groups of species participating in similar clusters among the five pasture/plantations over a gradient of decreasing association strength, and (3) there was evidence for repeatable communities—especially after banana cultivation—suggesting that past crops not only persist after abandonment but also form significant associations with invading plants. I then showed how the clustering hierarchy could be used to decide if any two pasture/plantation plots were in the same community, that is, to define old field communities. Finally, I suggested a similar procedure could be used for any plant community where the mechanisms and tolerances of species form the “cohesion” that produces clustering, making plant communities different than random assemblages of species.
ISSN:2356-6140
1537-744X
1537-744X
DOI:10.1100/2012/365409