Modeling the Impact of Pollution and Predators on a Population of Northern Leopard Frogs

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Modeling the Impact of Pollution and Predators on
a Population of Northern Leopard Frogs

• By Kevin and Zack

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NORTHERN LEOPARD FROG
Lakes, streams, ponds, and marshes. Green,
sometimes light brown. Mutated frogs,
Minnesota, 1995. Turtles, snakes, lizards,
birds.
Habitat range
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A MATHEMATICAL REPRESENTATION
Life cycle of frog. Damage via pollution.
Predatory animals.
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MODELING THE FROG LIFE CYCLE
Three stages. Lizards eat only adult
frogs. Pollution affects all frogs.
Eggs laid 4.1/day/adult Eggs hatching 12
days Tadpoles maturing 60 days Population
cap 400 for adults, 1250 overall
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MORTALITY DUE TO POLLUTION
Pollution kills 4 tadpoles, eggs. 2 adult
frogs.
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FROGS PREDATORS (LIZARDS)
Lizards live 4 years. Birth rate based on
food. 2 frogs/lizard/day.
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THE COMPLETED MODEL
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POPULATIONS DURING A 1,400-DAY TRIAL
Populations shoot up Lizards catch up
to frogs Equilibrium reached
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FROG MORTALITIES BY CAUSE More deaths due
to pollution Lizards eat more, but only
adults Pollution affects all frogs
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Conclusion Pollution affects a population of
frogs more than predators.
Are there any questions? No? Great!
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Bibliography Dunn, Kyla, Freaky Frogs,
www.pbs.orgfrontline.online, 1998. Oregon State
University, Methroprene, www.ace.orst.edu/info/
extoxnet/pips/methroprene.htm, 1996 Three
Teachers Association, The Northern Leopard
Frog, www.alienexplorer.com/ecology/p146.html,
2000 Province of Nova Scotia, Northern Leopard
Frog, http//museum.gov.ns.ca/mnh/nature/frogs/n
orth.htm, 2000