Roseate Spoonbill

What is it?

• A “wading” bird• Lives in Florida• Feeds on:– Invertebrates

– Amphibians

– Fish

Feeding

• http://vimeo.com/19732047

Population Biology

• Population:– Individuals of the same species in an area

• Birth Rate:– The number of individuals that are born in a year

• Death Rate:– The number of individuals that die in a year

Spoonbill Scientist

Florida Everglades• 5 Spoonbills• Birth Rate = 2 • Death Rate = 1

• How many birds in 5 yrs?

• Hypothesis?

X-axis

x-axis

y-axis

x-axis

y-axis

Data point

Year 1

• 10 Spoonbills

Population Growth of Spoonbills

• You are a scientist in the Florida Everglades

• Number of birds = 5 spoonbills• Birth Rate = 2• Death Rate = 1• How many birds after 5 years?

Year 2

• 20 Spoonbills

Population Growth of Spoonbills

• You are a scientist in the Florida Everglades

• Number of birds = 5 spoonbills• Birth Rate = 2• Death Rate = 1• How many birds after 5 years?

Year 3

• 40 Spoonbills

0 1 2 3 4 5 60

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170

YEAR

POPU

LATI

ON

SIZ

E (In

divi

dual

s)

Year 4

• 80 Spoonbills

Population Growth of Spoonbills

• You are a scientist in the Florida Everglades

• Number of birds = 5 spoonbills• Birth Rate = 2• Death Rate = 1• How many birds after 5 years?

Year 5

• 160 Spoonbills

Population Growth of Spoonbills

• You are a scientist in the Florida Everglades

• Number of birds = 5 spoonbills• Birth Rate = 2• Death Rate = 1• How many birds after 5 years?

0 1 2 3 4 5 60

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

170

YEAR

POPU

LATI

ON

SIZ

E (In

divi

dual

s)

0 1 2 3 4 5 60

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

170

YEAR

POPU

LATI

ON

SIZ

E (In

divi

dual

s)

Growth Curve

EXPONENTIAL GROWTH

Year 6

• 320 Spoonbills

Year 7

• 640 Spoonbills

Year 20

• 5,242,880 Spoonbills

Question

• What would prevent exponential growth?

http://www.mathcs.org/java/programs/PopDynamics/index.html