1.2 Studying Populations

[object Object],[object Object]

What is POPULATION DENSITY? ,[object Object]

The number of individuals in an area ,[object Object]

How do ecologists determine the size of a population? ,[object Object]

[object Object],Direct Observations Counting one by one all members of a species in an area.

[object Object],Indirect Observations Observing tracks or other signs rather than the organisms themselves.

[object Object],Sampling Ecologists make an estimate. Count the number in a small area then multiply to find for a larger area

[object Object],Mark-and-Recapture Animal is captured, marked, and then released into the environment. They are then recaptured and counted.

What is an ESTIMATE? ,[object Object]

An approximation of a number, based on reasonable assumptions. ,[object Object]

When is sampling used to estimate a population? ,[object Object]

Sampling is used when it is not possible to count every member of a population because there are too many, they are too spread out, or not all the members of the population can be found. ,[object Object]

What causes populations to change in size? ,[object Object]

New members enter the population or members leave the population. ,[object Object]

What do scientists mean by BIRTH RATE & DEATH RATE? ,[object Object]

Birth Rate Number of births in a population in a certain amount of time. ,[object Object],Death Rate Number of deaths in a population in a certain amount of time.

What is IMMIGEATION? ,[object Object]

Moving into a population. ,[object Object]

What is EMIGRATION? ,[object Object]

Leaving a population ,[object Object]

What is a LIMITING FACTOR? ,[object Object]

An environmental factor that prevents a population from increasing. ,[object Object]

What factors limit population growth? ,[object Object]

Food Space Weather Conditions ,[object Object]

What is an environments CARRYING CAPACITY? ,[object Object]

The largest population that an environment can support. ,[object Object]

How can space & weather limit population growth? ,[object Object]

Space – If organisms are crowded, some will not be ale to reproduce or even survive. ,[object Object],Weather – Severe weather conditions can kill many members of the population.

1.2 Studying Populations

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1.2 Studying Populations