Evolutionary theory of parent-offspring conflict

Article Abstract:

Resolution models study parent-offspring conflict using assumptions about the phenotypic interactions between the parents and the offsprings to determine evolutionarily stable strategies (ESSs). Parent-offspring conflict is either taken as being affected by the actions of both the parents and the offsprings or by the parents' actions in response to offspring behavior. Resolution studies are complicated by dynamic conflicts, sibling conflicts and within-brood cannibalism and siblicide. Parent-offspring conflict arises due to the difference in the action of natural selection on genes in the parents and the offsprings.

Models, Cover Story, Genetic aspects, Animal behavior, Familial behavior in animals, Animal familial behavior

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Long time series reveal density dependence

Article Abstract:

A time series study of aphids and moths shows a significant dependence of population size on population density. I.P. Woiwod and I. Hanski showed the relationship in a study of nearly 6,000 time series of 263 species of moths and 94 species of aphids. All time series were longer than 10 years, and many were longer than 20 years. The dependence shown in the study undermines the assertion that insect populations vary randomly and emphasizes the need for long-term data collection.

Population density

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Hosts and parasitoids in space

Article Abstract:

Population dynamics researchers adapt a spatial theory governing the host-parasitoid relationship of Glanville fritillary butterfly (Melitaea cinxia) and its specific parasite, the parasitoid wasp (Cotesia melitaearum). The theory contests that host density and the extent of forest fragmentation influence the host-parasitism dynamics in a given metapopulation.

Analysis, Reports, Host-parasite relationships, Parasitological research

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