Dispersal syndromes drive the formation of biogeographical regions, illustrated by the case of Wallace’s Line
Open Access
- 6 January 2021
- journal article
- research article
- Published by Wiley in Global Ecology and Biogeography
- Vol. 30 (3), 685-696
- https://doi.org/10.1111/geb.13250
Abstract
Aim Biogeographical regions (realms) reflect patterns of co‐distributed species (biotas) across space. Their boundaries are set by dispersal barriers and difficulties of establishment in new locations. We extend new methods to assess these two contributions by quantifying the degree to which realms intergrade across geographical space and the contributions of individual species to the delineation of those realms. As our example, we focus on Wallace’s Line, the most enigmatic partitioning of the world’s faunas, where climate is thought to have little effect and the majority of dispersal barriers are short water gaps. Location Indo‐Pacific. Time period Present day. Major taxa studied Birds and mammals. Methods Terrestrial bird and mammal assemblages were established in 1‐degree map cells using range maps. Assemblage structure was modelled using latent Dirichlet allocation, a continuous clustering method that simultaneously establishes the likely partitioning of species into biotas and the contribution of biotas to each map cell. Phylogenetic trees were used to assess the contribution of deep historical processes. Spatial segregation between biotas was evaluated across time and space in comparison with numerous hard realm boundaries drawn by various workers. Results We demonstrate that the strong turnover between biotas coincides with the north‐western extent of the region not connected to the mainland during the Pleistocene, although the Philippines contains mixed contributions. At deeper taxonomic levels, Sulawesi and the Philippines shift to primarily Asian affinities, resulting from transgressions of a few Asian‐derived lineages across the line. The partitioning of biotas sometimes produces fragmented regions that reflect habitat. Differences in partitions between birds and mammals reflect differences in dispersal ability. Main conclusions Permanent water barriers have selected for a dispersive archipelago fauna, excluded by an incumbent continental fauna on the Sunda shelf. Deep history, such as plate movements, is relatively unimportant in setting boundaries. The analysis implies a temporally dynamic interaction between a species’ intrinsic dispersal ability, physiographic barriers, and recent climate change in the genesis of Earth’s biotas.Keywords
Funding Information
- Division of Graduate Education (DGE‐1746045, DGE‐1144082)
- Office of Postsecondary Education (P200A150101)
- National Human Genome Research Institute (HG002585)
This publication has 55 references indexed in Scilit:
- An Update of Wallace’s Zoogeographic Regions of the WorldScience, 2013
- THE BIOGEOGRAPHY OF SULAWESI REVISITED: IS THERE EVIDENCE FOR A VICARIANT ORIGIN OF TAXA ON WALLACE'S “ANOMALOUS ISLAND”?Evolution, 2012
- Wallace's Line and plant distributions: two or three phytogeographical areas and where to group Java?Biological Journal of the Linnean Society, 2011
- Quantitative and Qualitative β Diversity Measures Lead to Different Insights into Factors That Structure Microbial CommunitiesApplied and Environmental Microbiology, 2007
- FAST‐TRACK: Integrating QTL mapping and genome scans towards the characterization of candidate loci under parallel selection in the lake whitefish (Coregonus clupeaformis)Molecular Ecology, 2004
- The concept of the taxon cycle in biogeographyGlobal Ecology and Biogeography, 2002
- Maps of Pleistocene sea levels in Southeast Asia: shorelines, river systems and time durationsJournal of Biogeography, 2000
- THE ROLE OF INTRODUCED SPECIES IN THE DEGRADATION OF ISLAND ECOSYSTEMS: A Case History of GuamAnnual Review of Ecology and Systematics, 1998
- Conservation evaluation and phylogenetic diversityBiological Conservation, 1992
- Evidence from mitochondrial DNA that African honey bees spread as continuous maternal lineagesNature, 1989