Elevational species richness patterns emerge from multiple local mechanisms in Himalayan woody plants

  • Oommen M
  • Shanker K
  • 158

    Readers

    Mendeley users who have this article in their library.
  • 87

    Citations

    Citations of this article.

Abstract

We compared woody plant species distributions across nested spatial scales (local scale to entire Western Himalaya) and explored landscape scale patterns in detail to obtain inferences about the elevational gradient in species richness. Distribution data were compiled for 1100 species in the Western Himalaya, and primary data, comprising 123 species and 47 000 individuals, were collected for a landscape. Correlates of diversity were examined for the five spatial scales, and for different biogeographic groups at the landscape scale. The results indicate multiple mechanisms both within and across scales. At the landscape scale, though the mechanisms explaining unimodal species richness patterns were hard to separate, the underlying correlates of biogeographic groups were more distinct; temperate species richness followed mid-domain model predictions, and showed a nonlinear relationship with temperature, whereas tropical species richness tracked temperature and area. Simulations demonstrated that models with varying assumptions, while resulting in monotonic, unimodal, or multimodal patterns at local scales, could all lead to unimodal patterns at regional scales when multiple local replicates are aggregated, with a peak in the major ecotone. The turnover or successive accumulation of marginal species in ecotones potentially explains the mid-elevational peak in this zone. Landscape scale primary data on distribution and abundance could therefore be critical to understanding key aspects of macroecological patterns

Author-supplied keywords

  • Elevational gradients
  • Himalaya
  • Macroecology
  • Mid-domain effect
  • Plants
  • Spatial scale
  • Species richness

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • Meera Anna Oommen

  • Kartik Shanker

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free