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Using plant functional traits to explain community composition across a strong environmental filter in Australian alpine snowpatches

Version 2 2024-06-04, 08:51
Version 1 2018-10-12, 14:39
journal contribution
posted on 2024-06-04, 08:51 authored by Susanna VennSusanna Venn, K Green, CM Pickering, JW Morgan
Environmental filters act to limit the local community assemblage from the regional species pool by restricting the viable trait states that can occur there. In alpine snowpatches, the timing of snowmelt is a strong environmental filter. In coming decades, the strength of this filter is likely to relax with global climate change. We used three continuous plant functional traits (leaf area, plant height, seed mass) and their divergence (using the FDvar index) to document current patterns of community assembly and predict plant community responses to future environmental filters in alpine snowpatch vegetation. The community trait-weighted mean for leaf area and height, but not seed mass, was significantly higher in early snowmelt zones relative to mid and late melting zones across all snowpatches. Mean FDvar for height (but not leaf area or seed mass), by contrast, was substantially lower in early snowmelt zones, indicating that species growing in early melt zones are consistently taller than those growing in other zones. These results suggest that if climate change leads to earlier snowmelt and hence, a longer growing season, taller (more competitive) species with larger leaf areas (more productive) may replace short species in snowpatches as these plant communities re-assemble in response to changing environmental filters.

History

Journal

Plant ecology

Volume

212

Pagination

1491-1499

Location

Cham, Switzerland

ISSN

1385-0237

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2011, Springer Science+Business Media B.V.

Issue

9

Publisher

Springer

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