Jeff PatriarcheJohn C. PriscuCristina D. Takacs-VesbachLuke WinslowKrista F. MyersHeather BuelowRachael M. Morgan-KissPeter T. Doran 2019-10-18 tabular digitial data McMurdo Dry Valleys LTER McMurdo Dry Valleys LTER 10.6073/pasta/961988b61f4deed59d18980287bf65b0 https://mcm.lternet.edu/content/phytoplankton-water-column-profiles-lake-bonney-antarctica-2004-2015 Lake Bonney (McMurdo Dry Valleys, east Antarctica) represents a year-round refugia for life adapted to extreme conditions. Lake level has risen by more than 3 m since 2004, but impacts of rapid lake level rise on phytoplankton community structure is also poorly understood. From 2004 to 2015, in concert with the summer limnological samplings, an in situ submersible spectrofluorometer (bbe FluoroProbe) was used to profile phytoplankton throughout the water columns of east and west lobes Lake Bonney to quantify the vertical structure of four functional algal groups (green algae, brown/mixed algae, cryptophytes, cyanobacteria). Our findings showed that phytoplankton communities were differentially impacted by physical and chemical factors over long-term vs. seasonal time scales. Following a summer of rapid lake level rise (2010-11), an increase in depth integrated chlorophyll a (chl-a) occurred in Lake Bonney caused by stimulation of photoautotrophic green algae. Collectively our data reveal that phytoplankton groups possessing variable trophic abilities are differentially competitive during seasonal and long-term time scales owing to periods of higher nutrients (photoautotrophs) vs. light/energy limitation (mixotrophs). 2004-12-13 2015-01-16 ground condition As needed Lake Bonney is a saline lake with permanent ice cover at the western end of Taylor Valley in the McMurdo Dry Valleys of Victoria Land, Antarctica. It is 7 kilometres or 4.3 mi long and up to 900 metres or 3,000 ft wide. A narrow channel only 50 metres or 160 ft wide. Lake Bonney at Narrows separates the lake into East Lake Bonney 3.32 square kilometres or 1.28 sq mi and West Lake Bonney, 0.99 square kilometres or 0.38 sq mi. The west lobe is flanked by Taylor glacier. Valley: Taylor Distance to Sea : 25 Maximum Length (km): 4.8 Maximum Width (km): 0.9 Maximum Depth (m): 37 Surface Area (km^2): 3.32 Ice Thickness Average Surface (m): 3 - 4.5 Volume (m^3 * 10^6): 54.7 162.536209106445 162.353210449219 -77.697700500488 -77.724441528320 57m 57m meter Lake Bonney is a saline lake with permanent ice cover at the western end of Taylor Valley in the McMurdo Dry Valleys of Victoria Land, Antarctica. It is 7 kilometres or 4.3 mi long and up to 900 metres or 3,000 ft wide. A narrow channel only 50 metres or 160 ft wide. Lake Bonney at Narrows separates the lake into East Lake Bonney 3.32 square kilometres or 1.28 sq mi and West Lake Bonney, 0.99 square kilometres or 0.38 sq mi. Valley: Taylor Distance to Sea : 28 Maximum Length (km): 2.6 Maximum Width (km): 0.9 Maximum Depth (m): 40 Surface Area (km^2): 0.99 Ice Thickness Average Surface (m): 2.8-4.5 Volume (m^3 * 10^6): 10.1 162.354934692383 162.269104003906 -77.714805603027 -77.727287292480 57m 57m meter LTER Core Areas organic matter population dynamics None <cntperp> <cntper>McMurdo Dry Valleys LTER Information Manager</cntper> </cntperp> <cntemail>im@mcmlter.org</cntemail> Name: Renée F. Brown Role: data manager Not Applicable Not Applicable Field and/or Lab Methods A submersible spectrofluorometer (bbe Moldaenke Fluoroprobe; Beutler et al., 2002; Li et al., 2019) was lowered through the water columns in Lake Bonney beginning in the 2004-2005 field season. This instrument employs five light emitting diodes (LEDs) calibrated to the known excitation spectra of light harvesting antennae pigments of the following specific algal groups: 470 nm = green algae; 525 = brown/mixed algae; 570 nm = cryptophytes; 610 nm = cyanobacteria. An additional LED excited at 370 nm to estimate colored dissolved organic matter (CDOM), which was used to correct chl-a fluorescence.  The Fluoroprobe collected data continuously as it was lowered through the water column at approximately 20 cm s-1 yielding measurements at ~10 cm depth intervals. A submersible spectrofluorometer (bbe Moldaenke Fluoroprobe; Beutler et al., 2002; Li et al., 2019) was lowered through the water columns in Lake Bonney beginning in the 2004-2005 field season. This instrument employs five light emitting diodes (LEDs) calibrated to the known excitation spectra of light harvesting antennae pigments of the following specific algal groups: 470 nm = green algae; 525 = brown/mixed algae; 570 nm = cryptophytes; 610 nm = cyanobacteria. An additional LED excited at 370 nm to estimate colored dissolved organic matter (CDOM), which was used to correct chl-a fluorescence.  The Fluoroprobe collected data continuously as it was lowered through the water column at approximately 20 cm s-1 yielding measurements at ~10 cm depth intervals. unknown LIMNO_PHYTO_PROFILE Dataset code Internal dataset code. The data provider Internal dataset code. Sample ID Sample identification code The data provider Sample identification code Location Location of sample The data provider Location of sample Date Date sample was collected The data provider calendar date/time MM/DD/YYYY gregorian calendar Depth Depth sample was taken. The data provider meter Cyanobacteria Calculated concentration of Cyanobacteria at fluorescence value of 610 nm, measured as Chlorophyll-a. The data provider microGramsPerLiter Cryptophytes Calculated concentration of Cryptophytes at fluorescence value of 570 nm, measured as Chlorophyll-a. The data provider microGramsPerLiter Brown/Mixed Algae Calculated concentration of Brown/Mixed Algae at fluorescence value of 525 nm, measured as Chlorophyll-a. The data provider microGramsPerLiter Green Algae Calculated concentration of Green Algae at fluorescence value of 470 nm, measured as Chlorophyll-a. The data provider microGramsPerLiter McMurdo Dry Valleys LTER The data distributor shall not be liable for innacuracies in the content http 1 0 1 column , https://mcm.lternet.edu/sites/default/files/data/LIMNO_PHYTO_PROFILE.csv None 2019-10-18 2019-10-18 McMurdo Dry Valleys LTER http://mcmlter.org/ Biological Data Profile of the Content Standards for Digital Geospatial Metadata devised by the Federal Geographic Data Committee. Drupal Ecological information Management Systems, version D7, Biological Data Profile module