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Changes in the pelagic food web of southern Lake Michigan (CPFWSLM): Afood web under stress from non-indigenous species?

A major goal of this project is characterize seasonal dynamics of  nutrients and plankton in southern in southern Lake Michigan. We seek  to document recent  (1 + years) and long-term (3  years) changes.   Second, we propose to correlate these changes to impacts of   non-indigenous species, interannual variability in weather, and  oligtrophication.  The observations in this project expanded the  research monitoring program at Muskegon to include nearshore waters  before invasion of Cercopagis pengoi, which has its center of  abundance in nearshore waters.  The transect approach we pioneered  using standard and advanced technology is becoming standard practice  in other research monitoring efforts. We plan to use these data to  examine the role of  weather induced changes in zooplankton abundance  and community structure during a 1994-2  3, a period that includes the  warmest years and one of the coldest years on record (see figure  below). This period also saw varying planktivorus fish abundance (e.g.  Madenjian et al. 2  2), and in recent years an extreme drop in  chlorophyll concentration possibly associated with massive increase in  dreisseinid abundance.  Ultimately all observations will allow  documentation of long-term changes zooplankton by comparing our data  with those from the Cook Power Plant study (southeastern Lake  Michigan) of 1972-1983.  Work in CY2  8 will focus on analysis of our  Lake Michigan database which includes: invertebrate predatory  cladocerans, Leptodora kindti, Bythotrephes longimanus (thought to be  an important driver of zooplankton dynamics), and Cercopagis pengoi  along with all other zooplankton, chlorophyll, nutrient and physical  data. Time trends will be described and driving factors identified.   Past and recent surveys of dreissenids will be important for  understanding patterns.

Status
In progress
Type
Project
Start Date
End Date
Scope of Study
Field Investigation
Literature / Existing Data
Scale of Phenomena
Community
Impact of Pollutants
Exotic Species
Processes
Natural Ecological Processes
Lake Basin Connecting Channels
Lake Michigan
Purpose of Project
Trend Assessment
Resource Being Monitored
Habitat
Wildlife
Biology And Life History
Population Dynamics
Control And Mitigation
Biological Interactions (Predator/Prey)
Ecosystem Effects
Community Structure
Prevention and Introduction
Identification of Potential Invaders
Spread of Established ANS Populations
Predictive Models
Annex Numbers
Remedial Action Plans and Lakewide Management Plans
Research & Development
Annex 17
Impact of water quality and AIS on fish and wildlife populations and habitats
General
Aquatic Nuisance Species
Annex
  • Annex Numbers
    Annex Numbers
    Remedial Action Plans and Lakewide Management Plans
    Research & Development
  • Annex 17
    Annex 17
    Impact of water quality and AIS on fish and wildlife populations and habitats

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Great Lakes - St. Lawrence Region.