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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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Presentation Transcript
slide2

CRIME SCENE: LAKE MEAD

Breaking news: A new kind of mussel is found in Lake Mead.

slide3

ISI: Invasive Species Investigation

Grissom Says:

FOLLOW THE EVIDENCE!

For ISI: The “evidence” leads us to important information about: Identity, Impacts, Pathways, and Solutions.

the investigation begins idenity
The investigation begins:IDENITY?
  • Evidence: a specimen from the crime scene.
  • Analysis method: Attention to detail. Taxonomic identification.
knowledge of habitat and life history critical to understanding impacts

The investigation continues:BACKGROUND CHECK

Knowledge of habitat and life history critical to understanding IMPACTS

background check quagga mussel biology
BACKGROUND CHECKQuagga Mussel Biology
  • Voracious filterfeeders. They remove particles from the water column, increasing water clarity.
  • Accumulate environmental contaminants in their tissues.
  • Attach to most substrates including sand, silt, and harder substrates.
  • Quagga mussel prefers the deeper, cooler water as compared to zebra mussels.
  • They can stay alive for several days out of water in cool, moist conditions.
  • High fecundity: producing up to 1 million eggs per year!
slide8

BACKGROUND CHECKQuagga mussel habitat

(a mini-lesson on limnology)

Abiotic factors that structure aquatic ecosystems: temperature, oxygen, sunlight

slide13

What are some potential IMPACTS of quagga mussels on aquatic ecosystems?

What evidence of impact would we look for?

evidence of impacts
Evidence of IMPACTS?

ISI tool: analysis of patterns in ecosystems

(biotic and abiotic variables)

Possible biotic patterns? Chlorophyll a

Possible abiotic patterns? Light penetration

pathways
PATHWAYS?

Problem: Distribution of species keeps expanding.

How did it get into Lake Mead?

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ISI: Summary

Studying invasive species is much like studying a crime scene.

Scientists use “evidence”

  • knowledge of the species,
  • patterns in ecosystems,
  • observations from the field

to understand its Identity, Impacts, Pathways, and Solutions.

“The evidence never lies”

pathways19
PATHWAYS?

Analysis: Understanding a species life cycle can help us deduce invasion pathways.

pathways20
PATHWAYS?

Evidence: Adult mussels and veligers are found in ballast water, on motor boats, and in water from fish hatcheries.