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dc.contributor.authorAlados, Concepción L.es_ES
dc.contributor.authorEl Aich, Ahmedes_ES
dc.contributor.authorPapanastasis, Vasilios P.es_ES
dc.contributor.authorOzbek, Huseyines_ES
dc.contributor.authorNavarro, Teresaes_ES
dc.contributor.authorFreitas, Helenaes_ES
dc.contributor.authorVrahnakis, Mihalises_ES
dc.contributor.authorLarrosi, Drisses_ES
dc.contributor.authorCabezudo, B.es_ES
dc.date.accessioned2015-09-23T07:06:43Z-
dc.date.available2015-09-23T07:06:43Z-
dc.date.issued2004-12-
dc.identifier.citationEcological Modelling 180(4): 523-535(2006)es_ES
dc.identifier.issn0304-3800-
dc.identifier.urihttp://hdl.handle.net/10261/122500-
dc.description.abstractIn this study, we analyze the complexity of plant spatial patterns and diversity along a successional gradient resulting from grazing disturbance in four characteristic ecosystems of the Mediterranean region. Grazing disturbance include not only defoliation by animals, but also associated disturbances as animal trampling, soil compaction, and mineralization by deposition of urine and feces. The results show that woodland and dense matorral are more resistant to species loss than middle dense and scattered matorral, or grassland. Information fractal dimension declined as we moved from a dense to a discontinuous matorral, increasing as we moved to a more scattered matorral and a grassland. In all studied cases, the characteristic species of the natural vegetation declined in frequency and organization with grazing disturbance. Heliophyllous species and others with postrate or rosette twigs increased with grazing pressure, particularly in dense matorral. In the more degraded ecosystem, only species with well-adapted traits, e.g., buried buds or unpalatable qualities showed a clear increase with grazing. Indeed, the homogeneity of species distribution within the plant community declined monotonically with grazing impact. Conversely, the spatial organization of the characteristic plants of each community increased in the better-preserved areas, being also related to the sensitivity of the species to grazing impact. The degree of autocorrelation of plant spatial distribution at the species level and the information fractal dimension at the community level allow us to quantify the degree of degradation of natural communities and to determine the sensitivity of key species to disturbance.es_ES
dc.description.sponsorshipThe work was performed under the DRASME (Desertification Risk Assessment in Silvopastoral Mediterranean Ecosystems) collaborative research project and CICYT (Evaluación de la presión ganadera para la conservación de las estepas y matorrales Mediterráneos, project number AMB1998-1017). DRASME is funded by the EC under its INCO-DC programme, contract number ERBIC18-CT98-0392. The support from both programs is gratefully acknowledged. We are grateful to John Emlen, Carl Freeman and Bai-Lian Li for critically reading and helpful suggestions on the manuscript. Software for data analysis was developed by Juan Escós.es_ES
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.rightsclosedAccesses_ES
dc.subjectFractal analysises_ES
dc.subjectGrazing systemses_ES
dc.subjectSpatial patternses_ES
dc.titleChange in plant spatial patterns and diversity along the successional gradient of Mediterranean grazing ecosystemses_ES
dc.typeArtículoes_ES
dc.identifier.doi10.1016/j.ecolmodel.2003.10.034-
dc.description.peerreviewedPeer reviewedes_ES
dc.relation.publisherversionhttp://dx.doi.org/10.1016/j.ecolmodel.2003.10.034es_ES
dc.relation.csices_ES
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