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

Recommendations

Info

BIOLOGY Algae group distribution by depth Fall 2008 Lake Tahoe supports many types of algae. Different groups grow at various depths below the lake surface, depending on their specific requirements for light and nutrient resources. The three profiles shown below focus on the September-November period when the Depth (feet) 50 100 150 200 250 300 350 22−Sep−2008 TAHOE: STATE OF THE LAKE REPORT 2009 deep chlorophyll layer is beginning to break down as mixing in the upper water column commences (refer to Fig. 10.3 and compare similar dates). Two algal groups, chlorophytes, or green algae, and diatoms were dominant at this time of year. Notice the separation in depth Micrograms chlorophyll per liter 0 1 2 0 1 2 0 1 2 0 8−Oct−2008 between these two groups with the chlorophyte peaks occurring about 50 feet lower. This type of vertical separation is common in lakes as different algae coexist by occupying a unique depth range and thereby avoiding direct competition for resources. 6−Nov−2008 Chlorophytes Diatoms Chrysophytes Dinoflagellates CDOM Total chlorophyll 10.5
BIOLOGY TAHOE: STATE OF THE LAKE REPORT 2009 Algae groups as a fraction of total population Yearly since 1982 The population, or biovolume, of algal cells from different groups varies from year to year. Diatoms are the most common type of alga, comprising 40 to 60 percent of the total biovolume each year. Chrysophytes and cryptophytes are next, comprising 10 to 30 percent of the total. Since 2003 and including 2008, the chlorophytes, or green algae, have increased in abundance, and the relative contribution of each of the major algal groups has remained relatively uniform. 10.6
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: BIOLOGY Depth of chlorophyll maximu
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
show all

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

Create successful ePaper yourself

Delete template?

Save as template?