title: Changes in composition, ecology and structure of high-mountain vegetation: a re-visitation study over 42 years.
abstract: High-mountain ecosystems are increasingly threatened by climate change, causing biodiversity loss, habitat degradation and landscape modifications. However, very few detailed studies have focussed on plant biodiversity in the high mountains of the Mediterranean. In this study, we investigated the long-term changes that have occurred in the composition, structure and ecology of high-mountain vegetation in the central Apennines (Majella) over the last 42 years. We performed a re-visitation study, using historical and newly collected vegetation data to explore which ecological and structural features have been the most successful in coping with climatic changes. Vegetation changes were analysed by comparing geo-referenced phytosociological relevés collected in high-mountain habitats (dolines, gentle slopes and ridges) on the Majella massif in 1972 and in 2014. Composition analysis was performed by detrended correspondence analysis, followed by an analysis of similarities for statistical significance assessment and by similarity percentage procedure (SIMPER) for identifying which species indicate temporal changes. Changes in ecological and structural indicators were analysed by a permutational multivariate analysis of variance, followed by a post hoc comparison. Over the last 42 years, clear floristic changes and significant ecological and structural variations occurred. We observed a significant increase in the thermophilic and mesonitrophilic plant species and an increment in the frequencies of hemicryptophytes. This re-visitation study in the Apennines agrees with observations in other alpine ecosystems, providing new insights for a better understanding of the effects of global change on Mediterranean high-mountain biodiversity. The observed changes in floristic composition, the thermophilization process and the shift towards a more nutrient-demanding vegetation are likely attributable to the combined effect of higher temperatures and the increase in soil nutrients triggered by global change. The re-visitation approach adopted herein represents a powerful tool for studying climate-related changes in sensitive high-mountain habitats.
authors.affiliation: Envix-Lab, Dipartimento di Bioscienze e Territorio, Università degli Studi del Molise, Contrada Fonte Lappone, 86090 Pesche (IS), Italy.
authors.forename: Alberto
authors.initials: A
authors.lastname: Evangelista
authors.affiliation: Envix-Lab, Dipartimento di Bioscienze e Territorio, Università degli Studi del Molise, Contrada Fonte Lappone, 86090 Pesche (IS), Italy Istituto di Biologia Agro-Ambientale e Forestale, CNR/IBAF, Monterotondo, 00015 Rome, Italy frateludovico@gmail.com.
authors.forename: Ludovico
authors.initials: L
authors.lastname: Frate
authors.affiliation: Envix-Lab, Dipartimento di Bioscienze e Territorio, Università degli Studi del Molise, Contrada Fonte Lappone, 86090 Pesche (IS), Italy.
authors.forename: Maria Laura
authors.initials: ML
authors.lastname: Carranza
authors.affiliation: Dipartimento di Biologia Ambientale, Università di Roma "La Sapienza", Piazzale Aldo Moro 5, 00185 Rome, Italy.
authors.forename: Fabio
authors.initials: F
authors.lastname: Attorre
authors.affiliation: Envix-Lab, Dipartimento di Bioscienze e Territorio, Università degli Studi del Molise, Contrada Fonte Lappone, 86090 Pesche (IS), Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Pelino
authors.affiliation: Envix-Lab, Dipartimento di Bioscienze e Territorio, Università degli Studi del Molise, Contrada Fonte Lappone, 86090 Pesche (IS), Italy.
authors.forename: Angela
authors.initials: A
authors.lastname: Stanisci
keywords: Global change; Landolt indicators; Mediterranean mountains; life forms; phytosociological relevés; re-visitation study
references.citation: Ecol Lett. 2012 Apr;15(4):365-77
references.pmid: 22257223
references.citation: Oecologia. 2009 Sep;161(3):601-10
references.pmid: 19554352
references.citation: AoB Plants. 2014 Mar 26;6(0):null
references.pmid: 24790129
references.citation: Nature. 2000 Feb 24;403(6772):853-8
references.pmid: 10706275
references.citation: Glob Chang Biol. 2013 Oct;19(10):2965-75
references.pmid: 23749628
references.citation: Glob Chang Biol. 2014 Nov;20(11):3423-38
references.pmid: 24729460
references.citation: PLoS One. 2015 Mar 16;10(3):e0116013
references.pmid: 25774776
references.citation: Ecol Appl. 2010 Jan;20(1):30-59
references.pmid: 20349829
references.citation: Science. 2012 Apr 20;336(6079):353-5
references.pmid: 22517860
references.citation: Ambio. 2008 Jun;37(4):280-5
references.pmid: 18686507