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Communication at the NABS Annual meeting, Keystone, 2000
(257) THE EFFECT OF SEDIMENT NUTRIENT ENRICHMENT AND GRAZERS ON THE MYRIOPHYLLUM SIBIRICUM EPIPHYTE COMMUNITY.
A. Pinowska1,2 and R.L. Lowe1,2. 1Department of Biological Sciences, Bowling Green State University, Bowling Green, OH, 43403-0212, 2University of Michigan Biological Station, Pellston, MI, 49769
Submerged macrophytes are unique substrata for development and growth of epiphytic algae. Addition of nutrients to the sediments in which macrophytes are growing can stimulate the growth of macrophytes and epiphytic algae. In this study cuttings of Myriophyllum sibiricum were planted in pots and placed in 90 liter plastic mesocosms. The experiment consisted of four treatments representing different combinations of nutrients (low and high nutrient concentration in sediments) and snails (no snails and 200 snails added) in a complete factorial design. After 4 weeks epiphyte samples were collected for chlorophyll a analysis and algal enumeration. Macrophyte samples with associated epiphytic algae were analyzed for CHN and total phosphorus content. Biomass of epiphytic algae expressed as chlorophyll a per plant surface area was highest in the high sediment nutrient treatment without snails. Nitrogen and phosphorus concentration in the macrophyte-epiphyte complex was high in the high nutrient treatments and low in the low nutrient treatments. Snails did not have significant effect on nitrogen and phosphorus content of the macrophyte-epiphyte complex.
Presented at 9:15 AM on Thursday, June 1, 2000 in Factors Affecting Algal and Macrophyte Growth I
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