NDLI: Local and regional-scale factors drive xerophytic shrub community dynamics on Mediterranean stabilized dunes

Content Provider	Springer Nature Link
Author	Chozas, Sergio Correia, Otília Porto, Miguel Hortal, Joaquín
Copyright Year	2015
Abstract	The aim of this study was to analyse the main drivers of compositional and distributional changes of xerophytic shrub communities at different spatial scales. We also assess whether the ecological dynamics of these communities comply with the Clementsian and/or Gleasonian paradigms of community assembly.We study the influence of environmental variables and human impacts at different scales on three xerophytic scrub communities growing on inland sand dunes. In 70 plots we sampled shrub cover, herb presence, soil characteristics and human disturbance. PCA and NMS were used to describe environmental and species variations. The effects of main drivers were assessed through Mantel tests, taking spatial structure into account. GAMs were used to model the scrub dynamics across environmental gradients.We found that local and regional environmental factors drive the patchy distribution of the xerophytic scrub communities. The gradient found from Stauracanthus genistoides to Ulex australis-dominated communities depends on nutrient availability, probably through species interactions, namely facilitation and competition. In turn, the gradient from S. genistoides to Juniperus navicularis-dominated communities follows an aridity gradient associated with human disturbance, namely agriculture.We propose that the three studied scrub communities are the extremes of two successions. The S. genistoides to U. australis-dominated communities’ succession is driven by local edaphic factors, following Clementsian principles while the S. genistoides to Juniperus navicularis-dominated communities’ succession responds to local—disturbance—and regional—aridity—processes, following both Clementsian and Gleasonian principles. This implies that only dynamic management approaches directed to ensure a natural functioning of this landscape can be successful for their long-time preservation.
Starting Page	413
Ending Page	426
Page Count	14
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	391
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer International Publishing
Publisher Date	2015-03-19
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Community structure Spatial scale Soil organic matter Aridity, semi-arid shrubs Inland dunes Human impacts Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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