State of the Lake 2009 - Tahoe Environmental Research Center ...

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BIOLOGY Shoreline algae populations Yearly since 2000 Periphyton, or attached algae, makes rocks around the shoreline of Lake Tahoe green and slimy. Periphyton is measured eight times each year, and this graph shows the maximum biomass measured at four sites. In 2008, concentrations were near or Chlorophyll (milligrams per square meter) 300 250 200 150 100 50 0 TAHOE: STATE OF THE LAKE REPORT 2009 above average. The two sites with the most periphyton (Tahoe City and Pineland) are closest to urban areas. Peak annual biomass at the less urbanized Zephyr Point site was about 2-3 times higher than found previously. To date, no statistically Sugar Pine Pt. Zephyr Pt. Pineland significant long-term tend in maximum periphyton biomass has been detected at these locations. However, the higher biomass at the more urban sites has been dramatic year after year. Tahoe City 2000 2001 2002 2003 2004 2005 2006 2007 2008 10.9
BIOLOGY Shoreline algae distribution In 2008 Periphyton biomass was surveyed around the lake during the spring of 2008, when it was at its annual maximum. Nearly 45 locations were surveyed by snorkel in 1.5 feet of water. A Periphyton Biomass Index TAHOE: STATE OF THE LAKE REPORT 2009 (PBI) was developed as an indicator to reflect what the casual observer would visually detect looking into the lake from the shoreline. The PBI is defined as the percent of the local bottom area covered by periphyton multiplied by the average length of the algal filaments (cm). Zones of elevated PBI are clearly seen. (The width of the colored band does not represent the actual dimension of the onshoreoffshore distribution.) 10.10
Page 1 and 2:
TAHOE: STATE OF THE LAKE REPORT 200
Page 3 and 4:
INTRODUCTION The University of Cali
Page 5 and 6:
EXECUTIVE SUMMARY (CONTINUED FROM P
Page 7 and 8: ABOUT LAKE TAHOE AND THE TAHOE BASI
Page 9 and 10: MAP OF TAHOE BASIN DATA COLLECTION
Page 11 and 12: Rainbow, Brook, Brown and Lake trou
Page 13 and 14: 100% 90% 80% 70% 60% 50% 40% 30% 20
Page 15 and 16: ASIAN CLAM Asian Clam Excretion Exp
Page 17 and 18: ASIAN CLAM Asian Clam Size Distribu
Page 19 and 20: Temperature ( o F) 60 55 50 35 30 M
Page 21 and 22: Temperature ( o F) 70 60 50 40 30 2
Page 23 and 24: Inches 70 60 50 40 30 20 10 0 METEO
Page 25 and 26: Percent 80 70 60 50 40 30 20 10 0 M
Page 27 and 28: PHYSICAL PROPERTIES TERC.UCDAVIS.ED
Page 29 and 30: Feet 6232 6230 6228 6226 6224 6222
Page 31 and 32: Temperature ( o F) TERC.UCDAVIS.EDU
Page 33 and 34: Temperature ( o F) TERC.UCDAVIS.EDU
Page 35 and 36: Density Difference (kilograms per c
Page 37 and 38: Mean daily streamflow (cubic feet p
Page 39 and 40: NUTRIENTS AND PARTICLES TERC.UCDAVI
Page 41 and 42: TERC.UCDAVIS.EDU NUTRIENTS AND PART
Page 43 and 44: Metric Tons TERC.UCDAVIS.EDU 10 8 6
Page 45 and 46: Dissolved inorganic nitrogen (micro
Page 47 and 48: Nitrate−nitrogen (micrograms per
Page 49 and 50: BIOLOGY 10
Page 51 and 52: BIOLOGY Algae abundance Yearly sinc
Page 53 and 54: BIOLOGY Depth of chlorophyll maximu
Page 55 and 56: BIOLOGY TAHOE: STATE OF THE LAKE RE
Page 57: BIOLOGY Nutrient limitation of alga
Page 61 and 62: TERC.UCDAVIS.EDU CLARITY Annual ave
Page 63 and 64: Depth (feet) TERC.UCDAVIS.EDU CLARI
Page 65: TERC.UCDAVIS.EDU OUTREACH AND EDUCA
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State of the Lake 2009 - Tahoe Environmental Research Center ...

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