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

Recommendations

Info

BIOLOGY Algae concentration by depth In 2008 The highest concentrations of algae (as measured by chlorophyll a concentration) occur in summer between the 100 and 200-foot depths. This discrete layer, known as the TAHOE: STATE OF THE LAKE REPORT 2009 deep chlorophyll maximum, forms in spring and persists until winter mixing redistributes algae. In 2008, winter mixing began in late-November and early-December. The deep chlorophyll layer is below the Secchi depth (Figs. 11.1 and 11.2), and does not influence lake clarity until winter mixing relocates chlorophyll into the range of the Secchi disk (50 to 80 feet). 10.3
BIOLOGY Depth of chlorophyll maximum Yearly since 1984 The depth at which the deep chlorophyll maximum occurs varies from year to year. In 2008, the deep chlorophyll maximum was relatively shallow at about 115 feet. The deep Depth (feet) 0 50 100 150 200 250 300 1984 1986 1988 1990 TAHOE: STATE OF THE LAKE REPORT 2009 chlorophyll maximum depth has generally been getting shallower over time, a trend believed to be linked to the decline in water clarity. 1992 1994 1996 1998 2000 2002 2004 2006 2008 10.4
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: BIOLOGY Algae abundance Yearly sinc
Page 55 and 56: BIOLOGY TAHOE: STATE OF THE LAKE RE
Page 57 and 58: BIOLOGY Nutrient limitation of alga
Page 59 and 60: BIOLOGY Shoreline algae distributio
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

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

Create successful ePaper yourself

Delete template?

Save as template?