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Field and Lab Test of the Hypothesis that Zebra Mussels Release Phytoplankton from P-Limitation

There is considerable evidence that growth and activities of   phytoplankton communities in the Great Lakes are generally limited   by phosphorus availability.  Past investigations have also indicated   that one of the short-term effects of zebra mussels is to greatly   alter the phosphorus availability by remineralizing large quantities   of phosphate, thereby releasing phytoplankton populations from P-  limitation.  Nutrient amended bioassays and natural assemblage   studies were conducted to determine if zebra mussels affected P-  limitation.  It was found that zebra mussels were capable of   relieving P-limited phytoplankton from P-limitation, with amendments   of phosphate alone producing the same results.  It was also shown   that the closer phytoplankton assemblages were to dense populations   of zebra mussels in the lake, the lower the degree of P-limitation   they exhibited in graded physiological responses. 

In progress
Start Date
End Date
Scope of Study
Field Investigation
Laboratory Investigation
Scale of Phenomena
Impact of Pollutants
Nutrients, Including Phosphorus
Annex Numbers
Control of Phosphorus
Research & Development
Annex 17
Impact of water quality and AIS on fish and wildlife populations and habitats

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