 Observations of Degrowth in Zebra Mussels (Dreissena polymorpha) During Field Studies in Kentucky Lake, Kentucky
Description: Abstract:
One hundred zebra mussels were collected from a site located near Kentucky Dam in the Kentucky portion of the Tennessee River on 20 April 1997 to study in situ growth rates. Four chambers, each containing 25 individual compartments, were secured to the substrate. A 100% survival rate was observed during this study. Initial measurements of shell length, shell height, shell width, and whole wet weight were compared with measurements obtained on 12 June 1997 when chambers were removed and zebra mussels were sacrificed. Chamber one had a change in mean shell length of +1.7 mm, in chamber two +1.8 mm, in chamber three +1.7 mm, and chamber four +2.5 mm. All four chambers contained individuals (%) that exhibited degrowth in shell height. Change in mean shell height in chamber one was 0.0 mm with 52% exhibiting degrowth, in chamber two 0.0 mm with 52%, in chamber three +0.6 mm with 20%, and in chamber four +0.9 mm with 8%. Chambers one and two contained individuals (%) that exhibited degrowth in shell width. Change in mean shell width in chamber one was +1.7 mm with 4%, in chamber two +1.9 mm with 8%, in chamber three +1.1 mm, and in chamber four +1.7 mm. Change in mean whole wet weight in chamber one was +0.541 g, in chamber two +0.555 g, in chamber three +0.556 g, and in chamber four +0.564 g. Zebra mussels do exhibit shell growth and increases in mass in Kentucky Lake. Negative values were observed for some shell parameters. Further studies need to evaluate the principle components involved in degrowth under various laboratory and field conditions.
Resource Type: Issue Overviews, Journal Articles
Resource Format: PDF
Publisher: United States Geological Survey, Florida Integrated Science Center (USGS FISC) |
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