Information collection and spread by networks of patrolling ants

Article Abstract:

A model present a communication network of an ant colony and explains how the flow of information is maintained. Patrolling ants are responsible for the collection and distribution of information throughout their domain. The efficiency of this information system depends on the network size and spatial patterns taken by this patrols. A larger network with greater numbers of patrolling ants provide the colony with more informations on its environment. More straighter paths taken by this scouts would increase the number of territories explored and would reduce the frequency of encounters among the patrols.

Models, Telecommunications systems, Animal communication, Ants, Insect societies

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Migration alone can produce persistence of host-parasitoid models

Article Abstract:

A study of unstable equilibrium in host-parasite systems is presented. It is believed that unstable equilibrium of a single-patch host-parasite model can persist only if there is asynchrony among the populations to buffer crashes. The three mechanisms for the maintenance of asynchrony are heterogeneity among patches, low but non-zero mifration rates and large numbers of patches. The specific type of heterogeneity arising from different initial conditions of coupled systems is discussed. It was shown that migration alone can allow persistence of host-parasite models.

Analysis, Animal migration, Animal populations, Host-parasite relationships

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Stumped by trees? A generalized null model for patterns of organismal diversity

Article Abstract:

An integration of several biological probabilities such as the independence of speciation over history of a specific lineage by the Markovian model of branching diversification makes it possible to predict the null possibility of origination of a tree of a particular topology. The generation of asymmetric trees is a rare process and identical speciation rates for all lineages contribute to the failure of this null model.

Biodiversity, Evolution (Biology), Origin of species, Species diversity

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