Essential Site Maintenance: Authorea-powered sites will be updated circa 15:00-17:00 Eastern on Tuesday 5 November.
There should be no interruption to normal services, but please contact us at [email protected] in case you face any issues.

loading page

How dispersal capacity makes non-dispersal functional traits of animal communities diverge or converge depending on spatial scale
  • +1
  • Ning Ding,
  • Hans Cornelissen,
  • Beixin Wang,
  • Matty Berg
Ning Ding
Nanjing Agricultural University

Corresponding Author:[email protected]

Author Profile
Hans Cornelissen
VU University Amsterdam
Author Profile
Beixin Wang
Nanjing Agricultural University
Author Profile
Matty Berg
Author Profile

Abstract

Community assembly theory proposed a hierarchy by which local composition is determined by both regional processes, e.g. dispersal and migration, and local processes, e.g. local filtering by environmental conditions and competition. How these factors interact and combined govern local species assembly and trait composition is poorly known. Thereto, we propose a conceptual model in which strong dispersal ability (linked to low environmental tolerance) is fitness-dependent, promoting species to track environmental changes; weak dispersal (linked to high tolerance) should be fitness-independent, enhancing the influence of competition. Conquently, local trait dissimilarity should have a positive humpback shape, while regional trait dissimilarity should have an upturned-humpback relationship with a dispersal trait gradient. We found strong empirical support for this concept in trait distribution patterns of stream macroinvertebrates from five basins across China. These findings are discussed in terms of metacommunity theory and merit further testing of our concept across ecosystems and organism worldwide.