What is resource-ratio hypothesis?

The resource-ratio hypothesis assumes that each plant species is a superior competitor for a particular proportion of the limiting resources and predicts that community composition should change whenever the relative availability of two or more limiting resources changes.

How do you calculate R ecology?

The net reproductive rate for a set cohort is obtained by multiplying the proportion of females surviving to each age (lx) by the average number of offspring produced at each age (mx) and then adding the products from all the age groups: R0 = Σlxmx.

What is resource competition?

Resource competition is a negative interaction between individuals associated with a requirement for shared limiting resources (light, nutrients, and water) resulting in a reduction in one or more fitness components at the individual or at the population level (see Glossary; Goldberg et al., 1999).

What is the resource ratio hypothesis quizlet?

Resource ratio hypothesis. Species coexist by using resources in different proportions. processes that mediate resource availability.

What does R mean in ecology?

r is for reproduction. Such a species puts only a small investment of resources into each offspring, but produces many such low effort babies. Such species are also generally not very invested in protecting or rearing these young. Often, the eggs are fertilized and then dispersed.

What is R ecology?

The R* rule (also called the resource-ratio hypothesis) is a hypothesis in community ecology that attempts to predict which species will become dominant as the result of competition for resources. The hypothesis was formulated by American ecologist David Tilman.

What does R represent in ecology?

What is resource competition theory?

Resource competition theory is a simple but mechanistic building block that encompasses the essence of consumer–resource interactions, and thus has been used to construct a wide variety of more complex models (e.g. Tilman 1990, 1994; Holt et al. 1994; Grover 1997; Chase & Leibold 2003).

Which statement about Huston’s dynamic equilibrium model is most accurate?

Which statement about Huston’s dynamic equilibrium model is most accurate? It is an elaboration of the intermediate disturbance hypothesis and predicts that species diversity will be highest in communities with low levels of both disturbance and competitive displacement.

What type of model emphasizes the role of chance and should be used in determining species diversity if species have equivalent interaction strengths?

Competing species coexist by using resources in different ways. includes rate of competitive displacement to determine species diversity. Lottery models emphasize. the role of chance in maintaining species diversity.

Which is true of the resource ratio hypothesis?

How are supply vectors used in Tilman’s model?

Tilman’s Model- Supply Vectors The supply vectors measure the rate of supply of resources in the environment The supply vectors depend upon The current resource levels The Resource Supply Point (S) 10.

Is the likelihood ratio on the X or y axis?

On the x-axis are values of a, while the y-axis is the value of the likelihood at the appropriate value of a. Most models have more than one parameter, but, if the values of all the other coefficients in the model are fixed, changes in a given a will show a similar picture.

What kind of test is the likelihood ratio?

There are three common tests that can be used to test this type of question, they are the likelihood ratio (LR) test, the Wald test, and the Lagrange multiplier test (sometimes called a score test).