Abrupt vegetation changes in the Segura Mountains of southern Spain throughout the Holocene

Citation
Js. Carrion et al., Abrupt vegetation changes in the Segura Mountains of southern Spain throughout the Holocene, J ECOLOGY, 89(5), 2001, pp. 783-797
Citations number
41
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
JOURNAL OF ECOLOGY
ISSN journal
0022-0477 → ACNP
Volume
89
Issue
5
Year of publication
2001
Pages
783 - 797
Database
ISI
SICI code
0022-0477(200110)89:5<783:AVCITS>2.0.ZU;2-Z
Abstract
1 The fossil pollen record of Canada de la Cruz in the Segura mountains of southern Spain yields insights into high-elevation vegetational dynamics ov er the last c. 8320 years. Phases of xerophytic grassland alternate with hi gh-mountain open pine forests and expansion of deciduous forests and Medite rranean scrub at lower altitudes. 2 Longer-term stable vegetation patterns are interrupted by multidecadal to century-scale shifts at about 7770, 3370, 2630, 1525 and 790 years BR 3 Some of the vegetation types have no modem analogues and represent high-a ltitude remnants of widespread last-glacial xerophytic communities. Other s pecies patterns, characteristic of current scrub associations, appeared onl y within the last 800 years. 4 The sequence fits within the regional context of a generally wet mid-Holo cene (c. 7700-3300 years BP) characterized by spread of mesophilous vegetat ion, between drier conditions characterized by greater abundance of xerophy tes. 5 The pollen record and current ecological studies on high-elevation vegeta tion of Mediterranean Spain suggest that control of vegetation is primarily climatic although grazing pressure, which would have pushed vegetation ove r a threshold for change, cannot be discounted.