1. Recent theoretical studieson population synchrony have focused on the role of dispersal, environmentalcorrelation, and density dependence in single species. Trophic interactionshave received less attention. Here we explore how trophic interactionsaffect spatial synchrony.
2. We consider a host-parasitoidcoupled map lattice to understand how the self-organizing spatial patternsgenerated by such dynamics affect synchrony. In particular, we calculatethe spatial correlation functions (SCFs) associated with travelling waves,spatial chaos, and crystal lattices.
3. Travelling waves areassociated with cyclic SCFs (coined second-order SCFs) that differ greatlyfrom those seen in spatial chaos or crystal lattices. Such U-shapped patternof spatial synchrony, which has not been predicted by single-species models,has been recently reported in real data. Thus, the shape of the SCF canprovide a test for trophically generated spatiotemporal dynamics.
hotel rooms Thira4. We also calculate thecross-correlation function between the parasitoid and the host. Relativehigh parasitoid mobility results in high within patch synchrony of thedynamics of the two species. However, with relative hig host mobility,the parasitoid dynamics begins to lag spatially behind that of the host.
5. We especulate that thisspatial lag between host and parasitoid is the ultimate source of travellingwaves, because the spatial correlation in turn affects host dynamics.
Tarifas de alojamiento Hamburg6. A new method to estimatethe spatial cross-correlation function between the two species is developedas an integral part of the paper.