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The Effects of Elevated CO 2 and UV Radiation on Carbon Cycling in the Microbial Loop. Dina M. Leech Dept. of Environ. Sciences and Engineering UNC-Chapel Hill. Whale Bone Bay, Bermuda. Limnology- study of inland waters. Lake Tahoe, CA. COMMUNITY Species diversity Abundance

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the effects of elevated co 2 and uv radiation on carbon cycling in the microbial loop

The Effects of Elevated CO2 and UV Radiation on Carbon Cycling in the Microbial Loop

Dina M. Leech

Dept. of Environ. Sciences and Engineering

UNC-Chapel Hill

Whale Bone Bay, Bermuda

slide3
COMMUNITY

Species diversity

Abundance

Distribution

Predator/prey interactions

ECOSYSTEM

Energy or Carbon cycling

Nutrient cycling

Ecological Stressors and Aquatic Ecosystems

Lake Tahoe, CA USA

abiotic environment
Abiotic Environment
  • Climate
    • Summation of weather conditions over long period of time
      • Temperature
      • Moisture
      • Wind
biomes and climate
Biomes and Climate

Temperature (oC)

slide8
Chemical Environment
    • Carbon Cycling
    • Nutrient Cycling
distribution and abundance of organisms
Distribution and abundance of organisms

A species’ tolerance for the abiotic environment is one of many factors that affect where it lives and how common it is

distribution and abundance of organisms1
Distribution and abundance of organisms
  • A species’ tolerance for the abiotic environment is one of many factors that affect where it lives and how common it is
  • Some species are widespread and common

pigeons

distribution and abundance of organisms2
Distribution and abundance of organisms
  • A species’ tolerance to the abiotic environment is one of many factors that affect where it lives and how common it is
  • Some species are widespread and common
  • Other species are localized and rare

Marine Iguana

distribution and abundance of organisms3
Distribution and abundance of organisms
  • The distribution and abundance of species changes over time
  • Some species decline in abundance and extent of geographic range
distribution and abundance of organisms4
Distribution and abundance of organisms
  • The distribution and abundance of species changes over time
  • Some species decline in abundance and range
  • Other species increase in abundance and expand in range
distribution and abundance of organisms5
Distribution and abundance of organisms
  • The distribution and abundance of species changes over time
  • Some species decline in abundance and range
  • Other species increase in abundance and expand in range
  • The causes of these changes include geological change, climate change, and “anthropogenic” factors
my research
My Research…
  • Increases in atmospheric CO2 concentrations
  • Effects on global climate

Manoa Record

increased uv radiation
Increased UV Radiation

ftp://jwocky.gsfc.nasa.gov/pub/eptoms/images/global/y2003/FULLDAY_GLOB.GIF

what does this mean for plants
What does this mean for plants?
  • Plants growing under elevated CO2 are higher in lignin content, shifting the C:N ratio
  • Basically, this plant material is tougher to break down and less nutritious to microbes
  • HOWEVER, UV can help the microbes by aiding in the degradation of this plant material

Elevated CO2, 780 ppm

Ambient CO2, 360 ppm

slide25

Effects of Climate Alterations on

Energy Transfer within the Microbial Loop

DOC from plant leachate

Bacteria

Protists

Rotifers

experimental setup
Experimental Setup

Solar simulator

Quartz tubes

light treatments
Light Treatments
  • Quartz- UV-B, UV-A, Visible
  • Mylar- UV-A, Visible
  • Acrylic- Visible
  • Exposed for 6hrs
experimental design
Experimental Design
  • Inoculate the DOC treatments with bacteria
  • Grow the bacteria for 3 days
    • Sample every day to observe changes in abundance
  • On the third day, feed the bacteria to protists (i.e. flagellates and ciliates)
  • Grow the protists for a few weeks
    • Watch how community changes
in summary
In Summary…
  • Abiotic factors and the physical environment vs. biotic factors
  • Organismal tolerance
    • Abundance and distribution patterns
  • CO2 and UV radiation as ecological stressors