ISI: Invasive Species Investigation CRIME SCENE: LAKE MEAD Breaking news: A new kind of mussel is found in Lake Mead. ISI: Invasive Species Investigation Grissom Says: FOLLOW THE EVIDENCE!
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Breaking news: A new kind of mussel is found in Lake Mead.
FOLLOW THE EVIDENCE!
For ISI: The “evidence” leads us to important information about: Identity, Impacts, Pathways, and Solutions.
Knowledge of habitat and life history critical to understanding IMPACTS
(a mini-lesson on limnology)
Abiotic factors that structure aquatic ecosystems: temperature, oxygen, sunlight
What evidence of impact would we look for?
ISI tool: analysis of patterns in ecosystems
(biotic and abiotic variables)
Possible biotic patterns? Chlorophyll a
Possible abiotic patterns? Light penetration
Zebra mussels detected
Zebra mussel detected
Problem: Distribution of species keeps expanding.
How did it get into Lake Mead?
Studying invasive species is much like studying a crime scene.
Scientists use “evidence”
to understand its Identity, Impacts, Pathways, and Solutions.
“The evidence never lies”
Analysis: Understanding a species life cycle can help us deduce invasion pathways.
Evidence: Adult mussels and veligers are found in ballast water, on motor boats, and in water from fish hatcheries.