Two-scale modelling of Saponaria bellidifolia Sm. (Caryophyllaceae) abundance on limestone outcrops from its northern range periphery (Southeastern Carpathians)
Artikel i vetenskaplig tidskrift, 2009

We modelled the effect of habitat heterogeneity on the abundance of the submediterranean Saponaria bellidifolia, a red list species in Romania. The study was designed at two scales: 100 and 0.5 m(2). At larger scale, generalized additive models and canonical correspondence analysis were used to model the density of ramets, whereas at microscale, binomial logistic regression was employed to model the species' occurrence. S. bellidifolia abundance responded sensitively to habitat type (classified as "grassy", "rocky" and "scree"), rather than to microclimatic variables. At both scales, habitat type was the best predictor of ramet abundance, followed by slope and vegetation cover. At 0.5 m(2), soil depth was also a good predictor of species occurrence. The data revealed that screes are the most suitable habitats for hosting relatively large populations of this rare species, because of occasional natural disturbances and presumably lower interspecific competition.

canonical correspondence-analysis

conservation

vegetation

temporal variation

pulsatilla-patens

niche

disturbance

genetic-structure

marginal populations

plant-communities

Författare

Anna-Maria Csergoe

Szilard Nemes

Göteborgs universitet

Chalmers, Matematiska vetenskaper, Matematik

Dan Gafta

Laszlo Demeter

Samuel Jakab

Plant Ecology

1385-0237 (ISSN) 1573-5052 (eISSN)

Vol. 203 2 229-242

Ämneskategorier

Ekologi

Skogsvetenskap

Mikrobiologi

DOI

10.1007/s11258-008-9539-2