r-strategists stable environment reproductive strategies & • lots...
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Reproductive Strategies & Survivorship
Stable Environment
K-strategists• Few offspring• Lots of parental care
Chaotic Environment
r-strategists• Lots of offspring• Very little if any
parental care
Name That Strategy!
r-selected
K-selected
K-selected
r-selected
It’s a Spectrum
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Why These Methods?
Survivorship!
Survivorship Curves
• Type I = K-selected species • Type II = In Between • Type III = r-selected species
It’s All About Habits and Habitats• Endangered species tend to be K-selected species.
• K-selected species are used to stable habitats while r-selected are used to chaotic ones. • r-selected is better at rebounding after a habitat
disturbance.
• K-selected • Niche Specialists • Commercial Value
What About Invasive Species?• Invasive species are one of our major concerns.
HIPCO• They have a specific niche, survivorship, and
reproductive strategy that make them invasive.
Use Tribbles to figure out what these characteristics are!
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Invasive Species Meet the Cane Toad!
• Introduced to Australia in 1935 as a form of pest control.
Greyback cane beetle was eating all the sugar cane!
• Not all of the details of the situation were considered before introducing them into the environment.
Here’s The Story!• Sugar cane is 6-8 feet tall and the cane beetle likes
to eat at the top of the stalk.Cane toads can’t fly or climb!
• Timing is everything! • Cane beetles are out during the day but cane
toads feed at night. • Don’t follow the same seasons either!
• They are niche generalists and are r-strategists laying 8,000-30,000 eggs per year, and are poisonous to Australian predators.
Who can compete with that??
Be Careful!!