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The role of population inertia in predicting the outcome of stage-structured biological invasions.

Authors :
Guiver, Chris
Dreiwi, Hanan
Filannino, Donna-Maria
Hodgson, Dave
Lloyd, Stephanie
Townley, Stuart
Source :
Mathematical Biosciences. Jul2015, Vol. 265, p1-11. 11p.
Publication Year :
2015

Abstract

Deterministic dynamic models for coupled resident and invader populations are considered with the purpose of finding quantities that are effective at predicting when the invasive population will become established asymptotically. A key feature of the models considered is the stage-structure, meaning that the populations are described by vectors of discrete developmental stage- or age-classes. The vector structure permits exotic transient behaviour—phenomena not encountered in scalar models. Analysis using a linear Lyapunov function demonstrates that for the class of population models considered, a large so-called population inertia is indicative of successful invasion. Population inertia is an indicator of transient growth or decline. Furthermore, for the class of models considered, we find that the so-called invasion exponent, an existing index used in models for invasion, is not always a reliable comparative indicator of successful invasion. We highlight these findings through numerical examples and a biological interpretation of why this might be the case is discussed. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00255564
Volume :
265
Database :
Academic Search Index
Journal :
Mathematical Biosciences
Publication Type :
Periodical
Accession number :
102982716
Full Text :
https://doi.org/10.1016/j.mbs.2015.04.005