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Shrub interactions drive vegetation succession of subalpine grasslands under two climatic conditions

Journal of Plant Ecology 2018年第2期11卷 297-307页

作者： paloma nuche Concepción L.Alados Department of Biodiversity Conservation and Ecosystem Restoration Pyrenean Institute of Ecology(IPE-CSIC)Avda.Montañana 1005PO Box 13034Zaragoza 50059Spain

Aims The abandonment of agronomic practices in subalpine systems has led to shrub encroachment,which has transformed grasslands into *** competitive and facilitative interactions among incoming shrub species might influence vegetation succession and might be affected by climate *** study aimed to identify the nature of shrub species interactions between an early colonizer and a secondary succession shrub in the successional encroach-ment process and whether it differs between two contrasting cli-matic *** The interactions between the two main encroaching shrub spe-cies in the Central Pyrenees(Spain),Buxus sempervirens and Echinospartum horridum,were studied at the current upper limit of the altitudinal range of ***,where it coexists with ***(high site),and in a milder location at lower eleva-tion(low site).in the studied areas,*** is the first shrub species that encroaches upon the abandoned grasslands and *** enters the system after *** has become established.A neighbor-removal experiment was used to assess the bidirectional interactions between both species,and whether those interactions differed among the life stages of ***(seed-lings,juveniles and adults),at the two study ***,annual crown growth and developmental instability(error in development caused by stress)were the performance indices used to quantify plant *** in air temperatures and soil nutrient amelioration were evaluated as possible mechanisms of facilitation of *** on *** Findings *** enhanced the survival of *** seedlings under its crown,whereas,*** adults outcompeted ***,the invasion of the grasslands by *** facilitated the settlement and expansion of ***,pro-moting vegetation succession at the *** addition,climatic differences associated with elevation affected shrub ***

关键词： climate change developmental instability plant interactions subalpine ecosystems vegetation succession

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Simplified Technique for Excision of Metastasizing Leiomyoma of Suprahepatic Inferior Vena Cava with Intracardiac Extension

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Open Journal of Thoracic Surgery 2012年第3期2卷 87-89页

作者： Anas Sarraj Pablo Alvarez paloma Corbaton José-Manuel nuche Department of Cardiovascular Surgery Pathology Hospital Universitario de La Princesa Universidad Autónoma de Madrid Madrid Spain

Uterine leiomyoma may metastasize via intravascular to the right heart cavities several years after hysterectomy. The symptoms are usually produced by compression of the tissues beside. We describe a simplified technique for excision of a benign metastasizing leiomyoma of suprahepatic segment of inferior vena cava with intracardiac extension.

关键词： Cardiac-General Xtracorporeal Circulation Minimal Invasive Surgery

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