secondary succession
DESCRIPTION
ANimal EcologyTRANSCRIPT
Secondary succession of semi-arid Mediterraneanold-fields in south-eastern Spain: insights for
conservation and restoration of degraded lands
Presented by : Created by: Andreu Bonet
Hafidz Fadilloh
Audia Andarini
Introduction
• In European Mediterranean Basin countries, socio-economic changes in the last decades have led to a dramatic rural exodus and subsequent abandonment of agricultural land
• Cessation of coppicing and diminishing of grazing in natural communities has also occurred
• In consequence, both landscapes and ecological processes have suffered from strong modifications, with marked effects in semi-arid areas
Methode
• Study Area
The study was conducted at the Ventos-Agost Catchment Experimental Station. (University of Alicante), in the Municipality of Agost, Alicante Province, SE Spain
• Sampling
Vegetation analysis was carried out through chronosequence sampling. For practical reasons, many of the Mediterranean secondary succession studies in oldfields have been done using a chronosequence approach instead of diachronic studies.
Data analyses
• These ordinations were performed using logarithmically transformed species percentage cover values and downweighting of rare species.
• Firstly, vegetation data were analysed by DCA with detrending by segments. The ordination was stable because random reordering of the data produced very close site scores
• Hierarchical classification, regression and correlation methods were carried out using SPSS software.
• Input data, yielding a matrix of 96 old-field samples and the 222 species recorded, were analysed by Detrended Correspondence Analysis (DCA) and Canonical Correspondence Analysis (CCA).
Species richness and functional groups
Species Richnees
Land use history
• From these results it could be inferred that the abandonment process in semi-arid old-fields affects vegetation dynamics in different ways, depending on the land use history and previous crop practices.
• Crop type affects the species cover of some of the most abundant species (Table 4), while other more generalist species are not constrained by previous cropping
Thanks