Flora S. Bacelar

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tlsb-1%Males are often the 'sicker' sex with male biased parasitism found in a taxonomically diverse range of species. There is considerable interest in the processes that could underlie the evolution of sex-biased parasitism. Mating system differences along with differences in lifespan may play a key role. We examine whether these factors are likely to(More)
Savannas are characterized by a discontinuous tree layer superimposed on a continuous layer of grass. Identifying the mechanisms that facilitate this tree–grass coexistence has remained a persistent challenge in ecology and is known as the ‘‘savanna problem’’. In this work, we propose a model that combines a previous savanna model Calabrese et al., 2010,(More)
Murine typhus or endemic typhus is a wide spread infectious disease, with a low prevalence in developed countries, but surely underdiagnosed. Its relative benignity, the similarity to other infectious diseases and the discretion of its epidemiologic chain, as well as the usual unexpectedness of its existence, makes its diagnosis more difficult. The clinical(More)
Network science has helped to understand the organization principles of the interactions among the constituents of large complex systems. However, recently, the high resolution of the data sets collected has allowed to capture the different types of interactions coexisting within the same system. A particularly important example is that of systems with(More)
We analyze the joint effect of contaminants and nutrient loading on population dynamics of marine food chains by means of bifurcation analysis. Contaminant toxicity is assumed to alter mortality of some species with a sigmoidal dose-response relationship. A generic effect of pollutants is to delay transitions to complex dynamical states towards higher(More)
Pristine coastal shallow systems are usually dominated by extensive meadows of seagrass species, 14 which are assumed to take advantage of nutrient supply from sediment. An increasing nutrient input is 15 thought to favour phytoplankton, epiphytic microalgae, as well as opportunistic ephemeral macroalgae 16 that coexist with seagrasses. The primary cause of(More)
In this work we introduce a differential equation model with time-delay that describes the three-stage dynamics and the two time scales observed in HIV infection. Assuming that the virus has high mutation and rapid reproduction rates that stress the immune system throughout the successive activation of new responses to new undetectable strains, the delay(More)
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