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Ecology Week 4 Class Notes

by: Naomi Hampton

Ecology Week 4 Class Notes BIOL 3060

Marketplace > Auburn University > Ecology > BIOL 3060 > Ecology Week 4 Class Notes
Naomi Hampton

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About this Document

These notes cover the lecture material for week 4.
Principles of Ecology
Dr. John Feminella
Class Notes
Ecology, decomposition, hydrologic
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This 6 page Class Notes was uploaded by Naomi Hampton on Wednesday September 21, 2016. The Class Notes belongs to BIOL 3060 at Auburn University taught by Dr. John Feminella in Fall 2016. Since its upload, it has received 5 views. For similar materials see Principles of Ecology in Ecology at Auburn University.


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Date Created: 09/21/16
BIOL 3060 9/6/16  Surface-Fresh Water <0.05% o Distribution  Aquatic (61%)  Lakes/reservoirs (60%)  Streams (1%)  Terrestrial (33%)  Atmospheric (6%)  Hydrologic Cycle-interactions of all sources of2H O o o When precipitation>infiltration, will have overland flow o Urbanization ↑, permeability ↓ o ↑ urbanization ↓ infiltration & interception o ↓permeability→↑overland flow ↑flooding ↑erosion ↑sedimentation & nutrient runoff ↑pollution ↓water quality  Nutrient=energy source/fuel=element  ~60 elements common in Biosphere; 30-40 in organism  Sources of Nutrients: o Terrestrial system  Inorganicchemical weathering rocks/soil  Organicorganismsdecompositionsliberates nutrients o Aquatic  Dissolved/precipitated in sediments  Organic/inorganic o Atmosphere  O, P,S, H, N  Sources for organisms o Plants (autotrophs)-(local ambient environment) o Animals/microbes (heterotrophs)  18 essential nutrients/elements o Carbon o Hydrogen o Oxygen o K o Calcium o Mg o Nitrogen o Phosphorous o Sulfur o Fe o Mn o Boron o Iodine o Cu o Zn o Nickel o Mo o Cl  Macronutrients o Need >1000mg/kg o C HOPKiNS Car Is an Mg  Micronutrients o A Festive MoB Comes in Clapping Nicely  Decomposition o Breakdown of organic matter o Food webs  o Decomposition=nutrient cycling  Simple cycle: living organismdeathdecomposers nd colonizebreakdownnutrient transformation/releaseuptake by 2 organismdeathetc.  Energy passes through system only once whereas nutrients are continually recycled  Carbon Cycle: Think P and R o  Leaf litter decomposition o Stages of breakdown:  Leaching (first 24hrs)  Microbial conditioning (weeks)  Fragmentation/skeletonization (months) 9/8/16  Quantifying Breakdown Rule o K=-ln(x/xt)0t o Natural experiment, no control group, just treatments o Time-series experiment o Why the difference?  Differences in temp/moisture  Role of Physical and Chemical actors in Breakdown o Soft leaves w/higher nitrogen content lost more mass o Tough leaves w/lower nitrogen content lost less mass o N content vs. Toughness (lignin) o  Role of Leaf Lignin in Breakdown o Leaves with higher lignin content decompose at much slower rate o  Common Pattern of Breakdown o “Exponential Decay” model o Each time x increases by 1, y decreases by half its previous value  Role of Abiotic Factors in Forest Litter Breakdown o Which shows the better fit?  Use of linear regression to test strength of a relationship  R =1 means all points are on the line  Regression or correlation does not imply causation  K vs. K  Decomposition Experimentrature Precipitation o Question: Do leaves containing more carbon compounds (lignin) degrade more slowly?  Bigleaf magnolia vs. southern magnolia o Question: Does presence of macroinvertebrates accelerate leaf decomposition?  Coarse vs. fine mesh bags  Physiological Ecology o Essential nutrients o Sequestration:  P:~1.5x more abundant in organism  C:~367x  N:~220x  Limiting Factors o Factor governing success of organism (population) o Key points:  Success limited by supply  If limitednegative effect (impact) o Types of Limiting Factors:  Condition: (eg. Temperature)  Varies in space & time  Can’t be lowered by organism  Resource: (eg. Water, nutrients, space)  Varies spatially & temporally  Can be lowered by organism  Limiting resources: o H O2(moisture) o O 2 o Light o Nutrients (some) Limiting Factor Desert Stream H2O (moisture) Resource Condition O Condition Resource 2 Light Condition Resource Nutrients Resource Resource o von Liebig  limiting factorslaw of the minimumthe most limiting nutrientgoverns success  PNK-most limiting in the environment


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