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Forschungsseminar Systemwissenschaft

Sommersemester 2015

Das Seminar findet jeweils dienstags um 10:15 Uhr im Fachbereich Biologie/Chemie, Barbarastr. 11, Raum 35/E25 statt.

Das Forschungsseminar ist eine Lehrveranstaltung, an der MSc-Studenten/-innen teilnehmen und dort ihre Masterarbeit präsentieren. Im Rahmen des Seminars stellen zudem Mitarbeiter/-innen und Promovierende des USF aktuelle Forschungsarbeiten vor.

Research Seminar Systems Science

Summer Semester 2015

The Research Seminar takes place on Tuesdays at 10:15 AM in room 35/E25 (School of Biology/Chemistry, Barbarastr. 11).

Timetable

* Target audiences

Abstracts of selected talks

Eduardo Liz, Departamento de Matemática Aplicada II, Universidad de Vigo (España)

Logistic population models revisited

The logistic equation is one of the best known models of population growth. The original ODE proposed by Verhulst inspired other related models which exhibit rich dynamics; for example, the discrete logistic equation (quadratic map) became a paradigm of chaos after the seminal papers of May.

In this talk, we consider logistic models of exploited populations, focusing on the changes in the dynamics as the harvesting effort is increased. In this way, we discuss the global dynamics and highlight the link among different logistic equations usually employed in population models.

Virgile Baudrot, Antoine Perasso, Clémentine Fritsch and Francis Raoul

Laboratoire Chrono-environnement – UMR 6249, Université de Franche-Comté / CNRS, 16 route de Gray, 25000 Besançon (France)

The foraging behavior on trophically transmitted parasites

Small mammal populations display fluctuating patterns of densities in many ecosystems worldwide, leading their predators to adapt their foraging strategy (the multi-species functional response, MSFR). The predator-preys relationship is the route of transmission of a large number of zoonotic parasites with a complex life cycle (infecting different hosts during their life), like the cestode Echinococcus multilocularis (Em). This parasite is widely distributed in the Northern Hemisphere and is the causative agent of the emerging zoonosis alveolar echinococcosis in humans. The red fox Vulpes vulpes is a typical definitive host (DH) of Em, with, in eastern France, the rodents Microtus arvalis and Arvicola scherman as intermediate hosts. We described this eco-epidemiological system with ODEs and we computed the basic reproductive number R₀, i.e., the number of secondary infections caused by a single primary infection into an otherwise susceptible population. We developed a general approach to model MSFR including accessibility to resources and switching of prey preference by predator. In this framework, we investigated the importance of MSFR and intermediate host diversity on the transmission patterns of Em. Few works have coupled adaptive predator-prey interactions with parasite transmissions, and the inclusion of switching behavior is a first attempt to feed hot topics linking adaptive foraging behavior and IHs diversity. We showed that switching of prey preference may have a dilution or amplification effect, that is a decrease, resp. increase, of the disease risk with an increase of IHs diversity.

Archive: Research Seminars of previous semesters