ECOLOGY STANDARD 6C

FL #6 Populations:THE CAUSES OFFLUCTUATIONS INPOPULATION

A POPULATION INCLUDES ALL THE ORGANISMS OF THE SAME KIND IN AN ECOSYSTEM.

THE 4 THINGS THAT AFFECT POPULATION SIZE:BIRTHIMMIGRATION

EMIGRATION

DEATH

(+) BABIES ARE BORN (+) INDIVIDUALS MOVE IN(-) INDIVIDUALS LEAVE

(-) INDIVIDUALS DIE

BIRTH ADD THESE TWINS TO THE HERD AND THE COUNT IS UP BY 2

WITH THIS CUTE LITTLE GUY THE COUNT IS UP BY 1 MORE – A TOTAL OF 3

IMMIGRATION

IF THESE 3 JOIN THE HERD – HOW MUCH HAS THE HERD INCREASED TOTALLY?

THE HERD IS NOW 6 ELK LARGER

BIRTH AND IMMIGRATION INCREASE A POPULATION

5 ELK + 3 BIRTHS + 3 IMMIGRATIONS

= 11 ELK

EMIGRATIONTHESE ELK ARE LEAVING THE POPULATION IN SEARCH OF GREENER PASTURES

11 – 2 = 9

DEATH

THIS ELK IS DEAD

9 - 1= 8

Did you ever wonder, what happened to Bambi?

BIRTH AND IMMIGRATION INCREASE THE POPULATION

EMIGRATION AND DEATH DECREASE THE POPULATION

A POPULATION IS AFFECTED BY 4 SEPARATE EVENTS. BIRTH AND IMMIGRATION WILL INCREASE THE POPULATION WHILE EMIGRATION AND DEATH WILL DECREASE THE POPULATION.

WHAT 4 EVENTS AFFECT THE SIZE OF A POPULATION?BIRTHIMMIGRATION

EMIGRATIONDEATH

IN A POPULATION THERE ARE 3 BIRTHS, 2 EMIGRATE, 1 DIES AND NONE IMMIGRATE. THE POPULATION WILL CHANGE BY HOW MUCH?

A. 0B. 1C. 2D. 3

FOR A POPULATION TO REMAIN THE SAME WHAT CONDITIONS MUST OCCUR?A. DEATHS MUST EQUAL IMMIGRATIONS AND

BIRTH EQUAL EMIGRATIONS

B. BIRTHS MUST EQUAL IMMIGRATIONS AND DEATHS EQUAL EMIGRATIONS

C. IMMIGRATIONS MUST EQUAL EMIGRATIONS AND BIRTHS EQUAL DEATHS

D. BIRTHS MUST BE GREATER THAN DEATHS AND EMIGRATIONS LESS THAN IMMIGRATIONS