posted Mar 27, 2017, 4:22 PM by Joseph Bickard

The Northeastern Association of Environmental Biologists held its annual meeting in Hartford on March 14 - 16, over 60 technical sessions. I attended five, on Wednesday, and Thursday morning. 

Jeremy Deeds of Maine DEP used our Highland Lake as an example in a statistical study to predice conditions for the bottom layer of a lake (hypolimnion) to deplete of oxygen (anoxia).

Matt Devine said the hatchling alewifes of Highland Lake are smaller than typical as they mature over days, weeks, months, probably because there are so many of them that they eat all the available zooplankton in the lake, and food shortage stunts their growth.

Nippo Lake in New Hampshire is suffering picoplankton blooms like we are. The presentation included a story about the local people believing a golf course and dirt road to be the source of phosphorus pollution, when in fact extensive sampling over months revealed the phosphorus was recycling from the sediments when the oxygen is depleted from the bottom layer (hypolimnion) of the lake water (anoxia).

Doug Suitor of Maine DEP lectured about a project DEP has under way to examine the influence of shoreline development on nearby lake plants, and has a preliminary list of "indicator species" that so far seem influenced. I expect to also make use of that list on data VLMP has collected for many years on several lakes.

Greg Bugbee talked about invasive aquatic plants in Connecticut. Nearly two-thirds of the lakes and ponds are infested with at least one invasive, the most common being Eurasian milfoil, curly-leaf pondweed, and minor niad. In the state's largest lake, 80 percent of the shoreline is infested.

Nancy Leland of LimTex, and cooperates with Prof. Jim Haney at Univ. New Hampshire, had a PowerPoint presentation of the kit that I expect to use this coming summer to collect and concentrate samples of the picoplankton that cause an algal bloom in Highland Lake for about four weeks during the summer.

Regards, Keith Williams