Chemotaxis-induced spatio-temporal heterogeneity in multi-species host-parasitoid systems.
When searching for hosts, parasitoids are observed to aggregate in response to chemical signalling cues emitted by plants during host feeding. In this paper we model aggregative parasitoid behaviour in a multi-species host-parasitoid community using a system of reaction-diffusion-chemotaxis equations. The stability properties of the steady-states of the model system are studied using linear stability analysis which highlights the possibility of interesting dynamical behaviour when the chemotactic response is above a certain threshold. We observe quasi-chaotic dynamic heterogeneous spatio-temporal patterns, quasi-stationary heterogeneous patterns and a destabilisation of the steady-states of the system. The generation of heterogeneous spatio-temporal patterns and destabilisation of the steady state are due to parasitoid chemotactic response to hosts. The dynamical behaviour of our system has both mathematical and ecological implications and the concepts of chemotaxis-driven instability and coexistence and ecological change are discussed.
Pearce
Ian G
IG
Division of Mathematics, University of Dundee, Dundee DD1 4HN, UK. ipearce@maths.dundee.ac.uk
Chaplain
Mark A J
MA
Schofield
Pietà G
PG
Anderson
Alexander R A
AR
Hubbard
Stephen F
SF
D000465:Algorithms; D000818:Animals; D001937:Brassica / Q000469:parasitology; D002080:Butterflies; D002633:Chemotaxis / Q000502:physiology*; D003198:Computer Simulation; D004058:Diffusion; D017753:Ecosystem; D005247:Feeding Behavior; D006790:Host-Parasite Interactions; D006927:Hymenoptera; D007814:Larva / Q000502:physiology; D008954:Models, Biological; D011156:Population Density; D011157:Population Dynamics