Invasion by alien plant species may be rapid and aggressive, causing erosion of local biodiversity. This is particularly true for islands, where natural and anthropogenic corridors promote the rapid spread of invasive plants. Although evidence shows that corridors may facilitate plant invasions, the question of how their importance in the spread of alien species varies along environmental gradients deserves more attention. Here, we addressed this issue by examining diversity patterns (species richness of endemic, native and alien species) along and across roads, along an elevation gradient from sea-level up to 2050 m a.s.l. in Tenerife (Canary Islands, Spain), at multiple spatial scales. Species richness was assessed using a multi-scale sampling design consisting of 59 T-transects of 150 m × 2 m, along three major roads each placed over the whole elevation gradient. Each transect was composed of three sections of five plots each: Section 1 was located on the road edges, Section 2 at intermediate distance, and Section 3 far from the road edge, the latter representing the “native community” less affected by road-specific disturbance. The effect of elevation and distance from roadsides was evaluated for the three groups of species (endemic, native and alien species), using parametric and non-parametric regression analyses as well as additive diversity partitioning. Differences among roads explained the majority of the variation in alien species richness and composition. Patterns in alien species richness were also affected by elevation, with a decline in richness with increasing elevation and no alien species recorded at high elevations. Elevation was the most important factor determining patterns in endemic and native species. These findings confirm that climate filtering reflected in varying patterns along elevational gradients is an important determinant of the richness of alien species (which are not adapted to high elevations), while anthropogenic pressures may explain the richness of alien species at low elevation.
Mountain Invasion Research Network
Permutational Analysis of Variance
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Electronic supplementary material
List of plant species recorded along the altitudinal gradient. Only those with appear in 5% or more plots are shown. Biogeographical status, origin, life forms and minimum and maximum altitude at which the species were found are shown. Transformer species are marked with an asterisk. Status: e = endemic; i, introduced; n = native; p = probably introduced. Origin: end = Canary Islands endemic; mac = Macaronesian region endemic; at = Atlantic; af = African; med = Mediterranean; cosm = cosmopolitan; am = American; euras = Eurasiatic; med atl = Mediterranean-Atlantic; as = Asiatic; med euras = Mediterranean-Eurasiatic. Life form: MPh = Meso- or Megaphanerophyte; NPh = Nanophanerophyte; Th = Therophyte; H = Hemicryptophyte; G = Geophyte; Ch = Chamaephyte.
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Bacaro, G., Maccherini, S., Chiarucci, A. et al. Distributional patterns of endemic, native and alien species along a roadside elevation gradient in Tenerife, Canary Islands. COMMUNITY ECOLOGY 16, 223–234 (2015). https://doi.org/10.1556/168.2015.16.2.10
- Diversity partitioning
- Invasive species
- Island biogeography
- Plant species richness