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Mapping the condition of Diporeia: Insights to mechanisms of declines

The holo-arctic amphipod, Diporeia spp., historically constituted a   large component of benthic invertebrate communities throughout the   Great Lakes region. However, since the early 199 's, this species-  group has experienced a precipitous decline in abundance in not only   lake Michigan, but also lakes Huron, Erie, and Ontario. Despite  intense research efforts, mechanisms of these declines remain   enigmatic. However, declines have occurred coincident with the   establishment of invasive dreissenid mussels, suggesting that  dreissenid-induced changes to lower trophic levels or alteration of   lake physical properties may be contributing mechanisms.    Interestingly, Diporeia declines have not progressed in a spatially   uniform manner, and there are areas within the aforementioned lakes   (especially offshore sites) and Lake Superior where Diporeia   persist. Further, Diporeia remains abundant in other systems (e.g.,  New York's Finger Lakes) despite invasion by dreissenids. This   suggests that Diporeia population characteristics and/or   environmental conditions critical for persistence vary across and   within systems.    Sampling of Diporeia from Lakes Michigan, Huron, Ontario, Superior,   as well as New York Finger Lakes will commence in Spring 2  8 --  Laboratory studies exposing Diporeia to different environmental   stressors will also begin Spring 2  8.    (AIS); (aquatic invasive species); (ANS); (aquatic nuisance   species); (zebra mussel); (zebra mussels); (Dreissena polymorpha);   (dreissenid); (dreissenids); (diporeia); (benthic); (benthos);   (Diporeia spp.); (Diporeia spp); (Lake Michigan); (Lake Huron);   (Lake Ontario); (Lake Superior)

In progress
Start Date
End Date
Maria S. SepulvedaResearcher
Associated with 5 projects
Tomas HookPrincipal Investigator
Associated with 2 projects
Steven PothovenResearcher
Associated with 3 projects
Thomas NalepaResearcher
Associated with 2 projects
Great Lakes Fishery Trust $ 569,689.00USDEstimates

Funding 4 projects for a total of $935,071.00
Scope of Study
Field Investigation
Laboratory Investigation
Scale of Phenomena
Impact of Pollutants
Exotic Species
Lake Basin Connecting Channels
Lake Huron
Lake Michigan
Lake Ontario
Lake Superior
Purpose of Project
Special Survey
Trend Assessment
Region Being Monitored
Near and OpenShore Waters
Resource Being Monitored
Plankton / Microorganisms
Biology And Life History
Ecosystem Effects
Nutrient / Contaminant Cycles
Annex Numbers
Research & Development
Surveillance and Monitoring
Annex 17
Impact of water quality and AIS on fish and wildlife populations and habitats
  • Annex Numbers
    Annex Numbers
    Research & Development
    Surveillance and Monitoring
  • Annex 17
    Annex 17
    Impact of water quality and AIS on fish and wildlife populations and habitats

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