Proposed Solution: Phytoplankton community in Lake Fulmor, CA Proposed Solution: Phytoplankton community in Lake Fulmor, CA Characterization of the phytoplankton.

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Proposed Solution: Phytoplankton community in Lake Fulmor, CA Proposed Solution: Phytoplankton community in Lake Fulmor, CA Characterization of the phytoplankton community in Lake Fulmor, CA, using embedded sensor networks Beth Stauffer, Stefanie Moorthi, Bin Zhang, Amit Dhariwal, Carl Oberg, Arvind Pereira, David Caron, Gaurav Sukhatme University of Southern California Introduction: Phytoplankton communities in aquatic & marine ecosystems Introduction: Phytoplankton communities in aquatic & marine ecosystems Highly variable phytoplankton communities Chemical & physical forcing of phytoplankton communities Phytoplankton populations can be limited by chemical nutrients such as nitrate, phosphate, and silicate. They are also strongly impacted by changes in physical parameters, including wind speed & direction (which directly affects mixing depth & water column stratification), light regime, & water flow Harmful algal & cyanobacterial blooms in aquatic environments Previous & current NAMOS work has focused on the Brown Tide organism, Aureococcus anophagefferens, & a Red Tide dinoflagellate, Lingulodinium polyedrum. In addition, some cyanobacteria produce hepatotoxins & neurotoxins that can have deleterious effects on animal & human health Study Site: Lake Fulmor, San Jacinto Mountains, CA Networked Aquatic Microbial Observing System (NAMOS) NAMOS deployments in 2005 & 2006Results & Figures UCLA – UCR – Caltech – USC – CSU – JPL – UC Merced Center for Embedded Networked Sensing Network of 10 buoys provides chlorophyll & temperature data from several locations with high temporal resolution Robotic boat fills in gaps spatially & can collect samples for further analysis Seasonal changes in water column stratification & chlorophyll concentration Relative chlorophyll in LF increased from a daily mean of 12 to 158 µg/L from May to October, 2005 (Figure 1a). Water column temperature stratification in LF decreased over the year Increasing the accessibility of nutrients to phytoplankton? Also increasing the amount of time spent outside of the euphotic zone (and thus promoting vertical migration)? Diel variations in chlorophyll concentration at single stations in lake (vertical migration) Maximum fluorescence measurements were observed at 1m depth from dusk  dawn (18:00-06:00) on a diel cycle. Additional sensing & sampling is underway in 2006 season to investigate the constituency & dynamics of migration Phytoplankton community composition LF was heavily dominated by cyanobacteria in July 2005, including species in the genera Microcystis (3b), Anabaena (3c,d), & Spirulina (3e). The dinoflagellate Ceratium was also abundant (3a). In October 2005 Anabaena (3i,j) was dominant in the surface scum, while the cyanobacterium Aphanizomenon (3g,h) was abundant in water collected from 0.5m depth. Diatoms of the genus Amphipleura (3f) were also present in the surface sample. Preliminary analyses of samples from the May 2006 deployment show dominance by diatoms (likely Asterionella) & cladocerans (mainly Daphnids). Problem Description: Sensor networks provide in situ presence at high resolution Problem Description: Sensor networks provide in situ presence at high resolution Altitude: ~ 5000 feet Maximum depth: 6m Low flow but relatively strong discrete wind events Observed surface scum formation during wind events Clockwise, from top left: Aerial photograph of Lake Fulmor (LF); Bathymetric map of LF (depths in meters); NAMOS buoys deployed in LF; Surface scum along shore. Components Turner Designs Cyclops 7 chlorophyll fluorometer at 0.5m depth Thermistor array to 2.5 m depth 6-port surface water sampler (on boat) Figure 2: Temperature stratification in LF (a-c) in May, July, & October 2005, respectively. Visualization display of surface chlorophyll concentrations along LF during October deployment (d). d cba Figure 1: Mean daily relative chlorophyll (& standard deviation) at Node 107 during 2005 deployments (a). Relative chlorophyll concentration at Node 107 during the October deployment (b), showing diel cycle. ba b a e c d g f h j i Figure 3: Dominant LF phytoplankton in July (a-e) & October (f-j) 2005