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Mountain invasions on the way:are there climatic constraints for the expansion of alien woody species along an elevation gradient in Argentina?

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Journal of Plant Ecology 2016年第4期9卷 380-392页

作者： Paula A.Tecco Ana I.Pais-Bosch Guillermo Funes Paula I.Marcora Sebastián R.Zeballos marcelo cabido Carlos Urcelay Instituto Multidisciplinario de BiologíaVegetal(CONICET-UNC) Velez Sarsfield 1611.Córdoba 5000Argentina Facultad de Ciencias Exactas Físicas y Naturales Universidad Nacional de CórdobaVelez Sarsfield 299Córdoba 5000Argentina Facultad de Ciencias Agrarias Universidad Nacional de Catamarca.Maestro Quiroga 51Catamarca 4700Argentina

Aims Increasing evidence worldwide indicates that high mountain regions are not immune to invasion by alien ***,we aimed to address whether three major woody invaders of low-mountain areas are constrained to lower altitudes due to climatic restrictions or just by low propagule *** hypothesize that the increasing climatic harshness towards higher altitudes restricts seedling establishment and survival of these woody invaders and thus their potential for altitudinal *** The study was carried out in the Sierras Grandes Mountains,Córdoba,central Argentina(32°50′S,64°90′W).We addressed the hypothesis with an experimental approach,dissociating the effect of the environmental gradient from that of propagule pressure,by discarding the influence of seed *** translocated seeds of Gleditsia triacanthos L.,Ligustrum lucidum *** Pyracantha angustifolia(Franch.)*** the altitudinal gradient(from 900 to 2700 m asl).Seven sites were selected along the altitudinal gradient,spaced every 200-400 *** plots(4×4 m)were selected within each altitudinal site and excluded from livestock;100 seeds of each species were sown within each plot(6300 seeds in total).Seedling emergence and survival was monitored during two growing seasons and soil temperature and moisture was recorded as *** field experiment was complemented with lab *** Findings Climate along this altitudinal gradient might be least restrictive at mid elevations,as a result of the intersection between opposite soil temperature and moisture *** seeds germinated along the whole altitudinal gradient and seedlings successfully established and over-wintered well above their current altitudinal distribution(up to 2200 m for Ligustrum and 2400 m for Gleditsia and Pyracantha).Additional lab assays confirmed field patterns and gave some insights into contrasting regeneration strategies between these invaders that might help to overcome stochastic e

关键词： altitudinal gradient exotic species Gleditsia triacanthos Ligustrum lucidum Pyracantha angustifolia seedling establishment

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