R* rule (ecology)

A bear with a salmon. Interspecific interactions such as predation are a key aspect of community ecology.

Hypothesis in community ecology that attempts to predict which species will become dominant as the result of competition for resources.

- R* rule (ecology)

4 related topics


Universal adaptive strategy theory

Evolutionary theory developed by J. Philip Grime in collaboration with Simon Pierce describing the general limits to ecology and evolution based on the trade-off that organisms face when the resources they gain from the environment are allocated between either growth, maintenance or regeneration – known as the universal three-way trade-off.

Plants with an S-strategy: In the foreground Juncus effusus, and behind that Vaccinium uliginosum, Athyrium filix-femina and Betula pubescens. Bog habitat in Tversted Plantation, Denmark.

Understanding the differences between the CSR theory and its major alternative the R* theory has been a major goal in community ecology for many years.

Size-asymmetric competition

Size-asymmetric competition refers to situations in which larger individuals exploit disproportionately greater amounts of resources when competing with smaller individuals.

A steam turbine with the case opened. Such turbines produce most of the electricity used today. Electricity consumption and living standards are highly correlated.

Contrasting assumptions about size-asymmetry characterise the two leading and competing theories in plant ecology, the R* theory and the CSR theory.

Invader potential

Qualitative and quantitative measures of a given invasive species probability to invade a given ecosystem.

This is shown directly through Tilman's R* rule.

Plant strategies

Plant strategies include mechanisms and responses plants use to reproduce, defend, survive, and compete on the landscape.

Here the relation between genotype and phenotype is illustrated, using a Punnett square, for the character of petal colour in a pea plant. The letters B and b represent alleles for colour and the pictures show the resultant flowers. The diagram shows the cross between two heterozygous parents where B represents the dominant allele (purple) and b represents the recessive allele (white).

G. David Tilman developed the R* rule in support of resource competition theory.