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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Host-parasitoid persistence over variable spatio-temporally susceptible habitats: bottom-up effects of ephemeral resources

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Reigada, Carolina [1] ; de Aguiar, Marcus A. M. [1]
Total Authors: 2
[1] Univ Estadual Campinas, UNICAMP, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: OIKOS; v. 121, n. 10, p. 1665-1679, OCT 2012.
Web of Science Citations: 2

We experimentally and theoretically investigated the persistence of hosts and parasitoids interacting in a metapopulation structure consisting of ephemeral local patches (MELPs). We used a hostparasitoid system consisting of necrophagous Diptera species and their pupal parasitoids. The basal resources used by the host species were assumed to be ephemeral, supporting only one generation of individuals before completely disappearing from the environment. We experimentally measured the hostparasitoid persistence and the effects of local demographic processes in two scenarios: 1) constant occurrence of basal resources at a single site (no dispersion or colonization of other sites) and 2) variable occurrence of basal resources between two sites (colonization of a new patch requiring species dispersal). The experimental setup and findings were then formalized into a mathematical model describing the interaction dynamics in a MELP structure. We evaluated the contribution of several factors to the hostparasitoid coexistence, such as resource allocation probability (probability of resource appearance in a site), variation in resource size and number of sites available to receive resources in the MELP. We found that demographic fluctuations and environmental stochasticity affected the density of migrants, patch habitat connectivity, persistence and spatial distribution of interacting species. (AU)

FAPESP's process: 09/05743-6 - Persistence of host-parasitoid interaction mediated by spatial structure and density-dependent factors
Grantee:Carolina Reigada Montoya
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 09/11032-5 - Population dynamics and semiclassical methods
Grantee:Marcus Aloizio Martinez de Aguiar
Support type: Research Projects - Thematic Grants