Phylogenetic Diversity in Rock Outcrop Plant Communities in Southeastern Brazil

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Phylogenetic Diversity in Rock Outcrop Plant Communities in Southeastern Brazil Colmenares S.L.T.1, Rosado B.H.P.2, de Mattos E.A.3 1 Universidade Federal do Rio de Janeiro Programa de Pós Graduação em Ecologia 2 Instituto de Pesquisa Jardim Botânico do Rio de Janeiro , 3 Universidade Federal do Rio de Janeiro Departamento de Ecologia Community Ecology & Function Symposia DNA barcodes and beyond: Developing and utilizing community-wide DNA sequence data to understand ecology and evolution of tropical biodiversity
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Talk presented at ATBC Congress 2012.

Transcript of Phylogenetic Diversity in Rock Outcrop Plant Communities in Southeastern Brazil

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Phylogenetic Diversity in Rock Outcrop Plant Communities in Southeastern BrazilColmenares S.L.T.1, Rosado B.H.P.2, de Mattos E.A.3 1 Universidade Federal do Rio de Janeiro Programa de Ps Graduao em Ecologia2 Instituto de Pesquisa Jardim Botnico do Rio de Janeiro , 3 Universidade Federal do Rio de Janeiro Departamento de Ecologia

Community Ecology & FunctionSymposia DNA barcodes and beyond: Developing and utilizing community-wide DNA sequence data to understand ecology and evolution of tropical biodiversity

Analysis of the phylogenetic structure of communities provide insights into the ecological processes that organize them (Webb, 2000)(Vamosi, et al. 2009)

ROCKY OUTCROPS OR INSELBERGSXeric islands in a tropical matrix

hotspots rich in species and endemismshighly specialized vegetation with interesting patterns of distribution and affinity to substratumgreat environmental heterogeneity

Vegetation is found forming elliptical soil-islands or patches of varying size and soil depth

These islands exhibit a clearly defined border, enabling precise delimitation of area and species compositionIncreases in area and substratum depth contain an apparent gradient on water and nutrient availability, which may restrict establishment of some plant species Smaller patches provide harsher environmental conditions than larger ones, probably filtering the species according to their ability to deal with environmental stresses

Thus, we postulated that species patch composition will vary according to size variation and species phylogenetic relatedness

A set of 26 vegetation patches of varied sizes (between 0.5 m2 and 30 m2) was censed to construct a presence/absence species vs. patch area matrix Methodology

PHYLOGENETIC COMMUNITY STRUCTURE22 species - 7 families

PHYLOGENETIC COMMUNITY STRUCTURECom 1Com 2ClusteredEvenly dispersed

We aim to explore if co-occurring species within each vegetation patch are phylogenetic evenly dispersed or clustered

The Mean Phylogenetic Distance (MPD) and the Mean Nearest Taxon Phylogenetic Distance (MNTD) were calculated and tested against null distribution of 999 null communities to obtain the standardized indexes:

Net Related Index (NRI) and Nearest Taxon Index (NTI)NRI or NTI +1.96ClusteredEvenly dispersedNRI or NTI - 1.96When:

RESULTS

We observed a significantly relationship between richness and patch area

NRI and NTI values were not significantly different from randomly generated null communitiesThus, we have some evidence that the presence of species of species in each vegetation patch presents random phylogenetic distribution

Further studies are necessary to test whether the above results can remain when variation in abundance of species and functional trait diversity are included on the analysis

So What can we expect ?

??Webb et al., 2002

ACKNOWLEDGMENTS

TO PROF. LCIA G. LOHMANNTO MY MOTHER

PARQUE ESTADUAL SERRA DA TIRIRICA NITERI, RJ

MPD was positively, but weak related to the patch area and number of taxa respectively (r2=0.18, pvalue=0.026; r2=0.30, pvalue=0.0024), whereas MNTD decreased with increasing number of taxa (r2=0.509, pvalue=0.000020).

AND WHAT ABOUT PHYTLOGENETIC RELATEDNESS BETWEEN CO-OCURRING SPECIES AT EACH VEGETATION PATCH?