1. The ecosystem impacts of cyanobacterial blooms: a pan-GLEON sampling and analysis program Cayelan Carey 1 1 Cornell University, Ithaca, NY USA Photo: Louise Miles

2. What happens to a lake ecosystem during a cyanobacterial bloom? Toxins, scums, odors all well documented But, what about lake biogeochemical cycles (C, N, P)? Phytoplankton, zooplankton dynamics? Cyanobacterial blooms significantly impact many ecosystem variables

3. Expanding my analysis to the GLEON network Survey indicates that ~55% of GLEON lakes consistently exhibit blooms every year Range of trophic status and cyanobacterial species represented

4. Soliciting historical & limnological data from GLEON (and non-GLEON) lakes I am collecting: 1.Historical weekly datasets 2.Weekly plankton samples If you can take a weekly plankton sample at your GLEON lake, I will count and ID the phytos for you. I will acknowledge you and your site on any publications that result from this project.

5. Lake/data requirements Lake must experience at least one bloom/summer. Plankton sample must be collected weekly throughout bloom season using a standardized sampling protocol. After bloom season ends, we will identify when bloom events occurred, and you will mail me the samples. I will count the phytos and send you the data.

6. Why this is a cool thing Cyanobacterial blooms are increasing every year in geographical range and frequency; there is much we do not know One of the first attempts to utilize the GLEON network to conduct large-scale, collaborative biology; perhaps a model for future GLEON research?

7. Interested in participating? Talk to me this week, come see my poster, or email me at: ccc99@cornell.edu