Lecture : Lecture 9

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mickeymousehotdog

13 Jul 2022

School

Dalhousie University

Department

Biology

Course

BIOL 2060

Professor

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Document Summary

Delays between crowding and its effects on population growth. It is a mathematical approx. based on a very simplified model. The real world is much more complicated and carriable. Many pop do not behave according to the logistic equation. Carrying capacity is not a hard and fast constant. A model is a way to summarize what is known about a pop, it is a formal description of an idea. All models are wrong, but some are useful- george box. It allows to describe and understand past and present trends, and project them into the future. Models are always a simplification of nature. Underlying assumptions have to be made explicit. The model can be refined as one understands the situation better. Logistic does predict an equilibrium, a density dependent equilibrium, so that when the density is too high when there too many individuals per unit area or volume, the pop will decline until it comes back into equilibrium.

Related Questions

General Ecology

What is meant by the carrying capacity of a population? Describe where it appears, and why, in (a) S-shaped population growth, (b) the logistic equation, and (c) dome-shaped net-recruitment curves.

According to the logistic model, a population grows fastest when: A. Birth rates are lowest and Death rates are highest. B. In a course-grained environment. C. It is close to its environmental carrying capacity. D. It is well above its environmental carrying capacity. E. It is well below the environmental carrying capacity.

byzantiumguinea-pig547

Question :Mutations that cause sickness and/or death after reproduction has occurred:

Question 1

options: can be passed on to future generations.

will not be passed on to future generations. are unlikely to occur.

are only passed on to future generations in species that have short life spans.

Question 2

In a population exhibiting logistic growth, what happens when the carrying capacity is exceeded?

Question 2 options:

The growth rate becomes zero until the population is back within the carrying capacity.

The growth rate becomes negative until the population is back within the carrying capacity.

The population crashes and becomes extinct.

The population's fertility drops to zero.

Question 3 How does exponential growth differ from logistic growth?

Question 3 options:

Logistic growth models take the population's age structure into account.

Long-term exponential growth is more commonly observed than long-term logistic growth in nature.

The logistic model of growth incorporates environmental limitations on population size.

Logistic growth generally comes with infinite expansion.

Question 4 Density-dependent and density-independent growth factors influence the size of a population by causing changes in the:

Question 4 options:

death rate and pattern of dispersion.

birth rate and death rate.

age structure and birth rate.

carrying capacity and age structure.

Question 5 The life history of an organism does not include the organism's

Question 5 options:

reproduction

All of these are included in an organism's life history.

death

birth

Lecture : Lecture 9

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