Physical, chemical and biological features of seven New Hampshire lakes were examined in September and October of 1997. Zooplankton communities exhibited evidence of “top-down” control in Milton Three Ponds (Depot, Norteast, and Townhouse Ponds), showing effects of a planktivorous fish, Alosa pseudoharengus: small mean body size, dominance of small grazers such as Bosmina, and absence of large grazers such as Daphnia. Phosphorus concentrations were positively correlated to fluorescence of all water fractions, chlorophyll a and a phytoplankton biotic pollution index (modified from Hillsenhoff, 1978), revealing a level of “bottom-up” control.
UNH Center for Freshwater Biology Research
Bradt, S. R. and Chungu, C., "The effects of alewife (Alosa pseudoharengus) on zooplankton community
structure in Depot Pond NH and a comparison of seven New Hampshire
lakes" (1999). Center for Freshwater Biology. 15.