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15 - Using Network Analysis to Explore the Role of Dispersal in Producing and Maintaining Island Species–Area Relationships

from Part IV - The Species–Area Relationship in Applied Ecology

Published online by Cambridge University Press:  11 March 2021

By
Joseph A. Veech  and
Giovanni Strona
Edited by
Thomas J. Matthews ,
Kostas A. Triantis  and
Robert J. Whittaker
Thomas J. Matthews
Affiliation:
University of Birmingham
Kostas A. Triantis
Affiliation:
National and Kapodistrian University of Athens
Robert J. Whittaker
Affiliation:
University of Oxford
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Summary

By taking advantage of spatially explicit modelling and network analysis, we investigated how species–area relationships (SARs) emerge and are maintained by dispersal and how the spatial arrangement of islands affects colonization/extinction dynamics of SARs. In particular, we generated different archipelagos characterized by varying geometric properties and then we simulated inter-island dispersal/colonization patterns. As the model proceeds through time, species accumulate on different islands according to their dispersal ability and depending on island size and isolation. During each time step, the model fit a power function that thus enabled us to track the emergence of island SARs (ISARs). After equilibrium was reached, we simulated a phase of reduced dispersal. Each simulated archipelago was analysed as a network in which each island was a node connected to other nodes (islands) based on pairwise spatial distances. We found that basic properties of the underlying connectivity network were correlated with ISAR properties, although the best predictor of richness was almost always island area. In nearly all simulations, the ISAR weakened after reducing the dispersal ability of the species. Our study demonstrates that a spatially explicit dispersal simulation model and network analysis can provide meaningful insight into the evolution and robustness of ISARs.

Keywords

Islandsisland species–area relationshipinter-island connectivitydispersalinter-island dispersal/colonizationisland biogeographyspatially explicit dispersal simulation
Type
Chapter
Information
The Species–Area Relationship
Theory and Application
 , pp. 368 - 398
Publisher: Cambridge University Press
Print publication year: 2021

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