Limitation of populations by weather-driven changes in food: a challenge to density-dependent regulation

Article Abstract:

There is increasing awareness of the role of the El Nino southern oscillation events and other large-scale variations in weather patterns, like the North Atlantic oscillation, in determining the ecological events. At the same time such extreme events serve to highlight the manner in which the effects of less dramatic changes in weather flow up food chains from plants through herbivores to carnivores.

Science & research, Research, Plant ecology, Food chains (Ecology), Food chains, Herbivores

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Opposing paradigms: regulation or limitation of populations?

Article Abstract:

The author compares the two prevailing paradigms for explaining animal population dynamics, regulation and limitation. Regulation presupposes that certain factors, such as predation or disease, act on populations to contain them within supportable levels of their specific habitats, while limitation presupposes that it is the habitats' support levels themselves which control population numbers.

Australia, Statistical Data Included, Models, Animal populations, Paradigm (Theory of knowledge), Ecological balance

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Nutrient retranslocation hypothesis: a subset of the flush-feeding/senescence-feeding hypothesis

Article Abstract:

The usage of colors by some species of aphids as a signal of the presence of good nitrogenous food is discussed. The unsuitability of nutrient retranslocation hypothesis is described.

Genetic aspects, Nutrient interactions, Aphididae, Aphids

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