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jvs1333-sup-0001-App1.docWord document329KAppendix S1. Individual of Azorella aretioides in our study area, 4700 m a.s.l., massively colonized by various beneficiary species, among which Senecio nivalis (white-grey Asteraceae) and Huperzia crassa (reddish erected pteridophyte).
jvs1333-sup-0002-App2.docWord document791KAppendix S2. Microenvironmental measurements inside and outside cushions of Azorella aretioides, at 4700 m a.s.l.
jvs1333-sup-0003-App3.docWord document40KAppendix S3. Variation in air temperature and rainfall at 15α Glacier. (a) Mean monthly temperature at 4850 m during years 2005, 2006 and 2007, 1.5 m above soil surface (Station ORE IRD-INAMHI, Maisincho & Carceres 2007), (b) mean temperature each 15 min on a 24-h scale at site 4700 m outside cushions (10 cm above soil surface), and (c) mean monthly rainfall amount at 4850 m, 1.5 m above soil surface, from 2000 to 2007; bars represents 95% confidence intervals (Station ORE IRD-INAMHI, Maisincho & Carceres 2007). Despite different height for measurements, stronger day-to-day variation than seasonal variation is easily identifiable.
jvs1333-sup-0004-App4.docWord document1121KAppendix S4. Importance of interactions between Azorella and other species at three elevations as calculated with the importance index Iimp (Seifan et al. 2010). Different types of triangles indicate facilitation (upward), neutral effect (horizontal) or inhibition (downward) by Azorella. Error bars represent 95% CI. See Fig. 4 for abbreviations of plant names.

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