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An Assessment Of Plankton Populations, Toxic Cyanobacteria, And Potential Impact Of Introduced Marine Alewife (Alosa Pseudoharengus) In Pawtuckaway Lake, New Hampshire, Jessica V. Trout-Haney
An Assessment Of Plankton Populations, Toxic Cyanobacteria, And Potential Impact Of Introduced Marine Alewife (Alosa Pseudoharengus) In Pawtuckaway Lake, New Hampshire, Jessica V. Trout-Haney
Center for Freshwater Biology
A field study was conducted during the summer, 2005 to evaluate the lake water quality and planktonic communities in Pawtuckaway Lake, NH. Of special concern was the condition of the plankton populations since the lake had been subjected to introductions of adult sea-run alewife
Overall water quality ranged from mesotrophic to eutrophic based on total phosphorus (8-31 !g L-1), chlorophyll a (max South, 5.0 !g L-1) and Secchi disk transparency (max North 5.1 m, min South 2.8 m). Of the three sites sampled, Fundy, North and South, Fundy (Zmax < 2 m) did not stratify and had the highest concentrations of total phosphorus, followed by North and South sites, respectively. North and South sites stratified throughout the summer and developed anoxic hypolimnia, with the most severe oxygen deficit at the North site
Potentially toxigenic cyanobacteria were detected at all three sites. Throughout the …
Migration Of Net Phytoplankton And Zooplankton In Mendum’S Pond, New Hampshire, Amanda L. Murby
Migration Of Net Phytoplankton And Zooplankton In Mendum’S Pond, New Hampshire, Amanda L. Murby
Center for Freshwater Biology
The study examines the vertical distribution and migratory behavior of net phytoplankton and zooplankton of Mendum’s Pond in Barrington, N.H. The cyanobacteria, Microcystis and Aphanocapsa were the dominant net phytoplankton in this lake. Dominant zooplankton included Daphnia ambigua, Daphnia catawba, Bosmina longirostris, and both calanoid and cyclopoid copepods. Vertical distribution of net phytoplankton suggested migratory behavior, but no consistent pattern was observed. The zooplankton migrated nocturnally, however, calanoid copepods seemed to simultaneously migrate nocturnally and reversely at sunset, suggesting the presence of separate species or different age classes. Diel vertical migration (DVM) of zooplankton was not correlated with the distributions …