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HLLT hosts Highland Lake Science Roundtable on Dec 1

posted Jan 28, 2018, 5:44 PM by Joseph Bickard
A group of researchers, scientists, water quality experts, representatives from the towns,
Inland Fisheries and Wildlife and the Department of Marine Resources. met at the Inland
Fisheries and Wildlife building in Gray, Maine, on Friday, December 1, 2017, for a day long
Highland Lake Science Roundtable. Dr. Karen Wilson, Professor of Environmental Studies
(USM) served as Facilitator. (see attached program for a list of all invitees)

The morning session focused on “The science behind why the Picocyanobacteria (Pcy)
bloom and why now at HL?” Jeff Dennis presented a power point that gave in in-depth view
of the data accumulated from HL since 1974. It was pointed out due to the efforts of Keith
Williams, and other dedicated water quality monitors at HL, that there is no other lake in
Southern Maine that has as significant a cache of data available for study, as is available on

The afternoon session focused on developing several hypotheses regarding the relative
contributors to the Pcy bloom. These hypotheses included:
Increase in phosphorus causes Pcy bloom - What are possible sources of P?
Fish, Bottom sediments, Pcy - Can Pcy mobilize P from bottom and deliver to water
Other hypotheses:
a. Climate change is driving the Pcy bloom
b. Timing of alewive spawning, growth, outmigration
c. Food Chain Dynamics cause Pcy bloom
d. Pcy migration from bottom of lake impacts Secchi Disk Transparency (SDT)