NDLI: Searching for Altitudinal Zonation: Species Distribution and Vegetation Composition in the Superpáramo of Volcán Iliniza, Ecuador

Content Provider	Springer Nature Link
Author	Sklenář, Petr
Copyright Year	2006
Abstract	Altitudinal variation of the zonal superpáramo vegetation was studied between 4300 and 4630 m to test a possible occurrence of a fine altitudinal zonation within the superpáramo belt. A rectangular grid of 1 m$^{2}$ sample plots was established; 25 replicate plots separated by a 3 m space were located along a 100 m long transect parallel to the contours, and there were 17 such transects separated by 20 m of altitude. Species were scored using a 7-grade cover scale and basic environmental data were gathered for each sample. Major changes occur over a short altitudinal range, at around 4400 m, which corresponds to a transition between the lower and upper superpáramo. Species richness sharply declines but species turnover (per altitude) increases along the altitudinal gradient. The correlation between richness and bare ground or rock cover is negative, but the correlation to rocks becomes positive above 4500 m. Species from lower altitudes tend to have narrower altitudinal range, although a large number of species appear to be indifferent to altitude. Direct ordination analyses indicate that high-altitude species show stronger correlation to environmental variables, especially rock, than species from lower altitudes. TWINSPAN cluster analysis delimited 15 groups of samples. There is a change in the clustering pattern along the altitudinal gradient from a horizontal (i.e., within altitude) to vertical (i.e., across altitude) arrangement of the cluster groups, although this pattern is partly obscured at the highest altitudes due to a large number of empty samples. MANOVA tests for samples from adjacent altitudinal levels indicate two distinct altitudinal breaks at lower altitudes, corresponding to the Loricaria-belt in lower superpáramo and the transition between lower and upper superpáramo, while no indication of a zonation was found in upper superpáramo.
Starting Page	337
Ending Page	350
Page Count	14
File Format	PDF
ISSN	13850237
Journal	Plant Ecology
Volume Number	184
Issue Number	2
e-ISSN	15735052
Language	English
Publisher	Springer Netherlands
Publisher Date	2006-04-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Altitudinal gradient Andes Elevation range Habitat diversity Tropical alpine Vegetation heterogeneity Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology Plant Science

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