Abstract:
:Species diversity has two components - number of species and spatial turnover in species composition (beta-diversity). Using a field experiment focusing on a system of Mediterranean grasslands, we show that interspecific competition may influence the two components in the same direction or in opposite directions, depending on whether competitive exclusions are deterministic or stochastic. Deterministic exclusions reduce both patch-scale richness and beta-diversity, thereby homogenising the community. Stochastic extinctions reduce richness at the patch scale, but increase the differences in species composition among patches. These results indicate that studies of competitive effects on beta diversity may help to distinguish between deterministic and stochastic components of competitive exclusion. Such distinction is crucial for understanding the causal relationship between competition and species diversity, one of the oldest and most fundamental questions in ecology.
journal_name
Ecol Lettjournal_title
Ecology lettersauthors
Segre H,Ron R,De Malach N,Henkin Z,Mandel M,Kadmon Rdoi
10.1111/ele.12343subject
Has Abstractpub_date
2014-11-01 00:00:00pages
1400-8issue
11eissn
1461-023Xissn
1461-0248journal_volume
17pub_type
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