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Jantz, N.; Homeier, J. &amp; Behling, H. (2014): <b>Representativeness of tree diversity in the modern pollen rain of Andean montane forests</b>. <i>Journal of Vegetation Science</i> <b>25</b>(2), 481-490.

Resource Description

Title: Representativeness of tree diversity in the modern pollen rain of Andean montane forests
FOR816dw ID: 1276
Publication Date: 2014-02-01
License and Usage Rights: PAK 823-825 data user agreement. (www.tropicalmountainforest.org/dataagreementp3.do)
Resource Owner(s):
Individual: Nele Jantz
Contact:
Individual: Jürgen Homeier
Contact:
Individual: Hermann Behling
Contact:
Abstract:
Questions: To assess the relationship between modern pollen rain and Andean<br/> montane forest vegetation for diversity, and provide a basis for interpretations of<br/> palaeoecological data in the northern Andes, we asked: (1) can the reduction of<br/> plant and pollen data to family level preserve information about diversity in both<br/> data sets; (2) how precisely do tree pollen and spore types represent richness patterns<br/> along an altitudinal gradient on tropical mountains; and (3) how similar<br/> are tree pollen and spore family richness in relationship to tree family richness?<br/> Location: Tropicalmontane rain forests, Podocarpus National Park in the Andes<br/> of South Ecuador (3°S, 79°W, 1000–3000 ma.s.l.).<br/> Methods:We analysed tree diversity and species composition in three different<br/> rain forest types: Premontane (PMF), lowermontane (LMF) and uppermontane<br/> (UMF).We investigated modern pollen rain using pollen traps. After testing the<br/> reliability of a taxonomic surrogacy on the plant data, we compared abundance<br/> and representation, as well as diversity of the two data sets at family level. This<br/> was done using rarefaction and Sørensen indices.<br/> Results: The correlation between tree species and families was high (r = 0.81,<br/> P < 0.001). Sample rarefaction on tree pollen and plant family data revealed<br/> highest pollen diversity on sites of the UMF, but highest tree diversity on LMF<br/> and PMF sites. The Sørensen indices indicate down-drift of pollen from higher<br/> altitudes in PMF and LMF and up-drift in UMF. Between 1% and 50% of pollen<br/> taxa of each sample originate fromoutside the plot.<br/> Conclusions: Taxonomic surrogacy at family level is a good tool for comparing<br/> presence–absence patterns of plant and pollen data in tropical regions with high<br/> tree diversity. On a family basis, pollen presence–absence data represent the corresponding<br/> tree vegetation data, but uncertainties increase with decreasing altitude.<br/> The higher diversity in pollen data of the UMF, but slightly lower diversity<br/> in the LMF and PMF, can at least partly be explained by wind patterns, local<br/> abundance of shrubs and herbs and differences in evenness.
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ARTICLE
Journal: Journal of Vegetation Science
Volume: 25
Issue: 2
Page Range: 481-490
Metadata Provider:
Individual: Jürgen Homeier
Contact:
Online Distribution:
Download File: http://www.lcrs.de/publications.do?citid=1276


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