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POPULATION ECOLOGY.  Kathy DeWet-Oleson / NOAA. Steve Lonhart / NOAA MBNMS . Steve Lonhart / NOAA MBNMS . LEVELS OF ECOLOGY. Population = all the individuals of a species that live in the same area. M/Y/D/S Animal Graphics. POPULATION SIZE. Steve Choy / NOAA MBNMS. CA Fish & Game.

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population ecology
POPULATION ECOLOGY

 Kathy DeWet-Oleson / NOAA

Steve Lonhart / NOAA MBNMS 

Steve Lonhart / NOAA MBNMS 

levels of ecology
LEVELS OF ECOLOGY

Population = all the individuals of a species that live in the same area

M/Y/D/S Animal Graphics

population size
POPULATION SIZE

Steve Choy / NOAA MBNMS

CA Fish & Game

I

E

How does population size change?

Births

Deaths

Immigration

Emigration

population size1
POPULATION SIZE

+

-

+

-

Steve Choy / NOAA MBNMS

CA Fish & Game

Nt+1= NtBDIE

population size2
POPULATION SIZE

+

Nt+1= NtBDIE

-

+

-

2,813 +328 – 430 + 0 - 0 = 2,711

Information from Otter Project & USGS

Scientists observed 2,813 sea otters along the Central Coast in 2009. 430 otters died and 328 pups were born. If there is no immigration or emigration, how many sea otters were there in 2010?

population size3
POPULATION SIZE

+

Nt+1= NtBDIE

-

+

-

2,711+2-10=2,703

If 10 sea otters leave the Central Coast population and 2 enter, what would the 2010 population be?

population size4
POPULATION SIZE

Steve Choy / NOAA MBNMS

US Geological Survey

population growth1
POPULATION GROWTH

Exponential Growth

Population Size

Time

population growth2
POPULATION GROWTH

Why don’t populations usually grow exponentially?

Limited resources – light, water, nutrients, food, space

Disease

Predation

population growth3
POPULATION GROWTH

Exponential Growth

Carrying Capacity

K

Population Size

Logistic Growth

Time

population growth4
POPULATION GROWTH

Carrying capacity

Elephant Seals

Number of pups born

Year

Photos by Kristin McCully

http://www.nmfs.noaa.gov/pr/pdfs/sars/po2007sene-ca.pdf

activity
ACTIVITY

Map of Average Annual Population Growth Rate, 1980-1998

(http://www.worldbank.org/depweb/english/modules/social/pgr/)

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