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Mark and Recapture
- Sources of error
- Human interference
- Nature (i.e. genetic drift)
- Small sample size
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Anticipated population size=>
necessary sample size
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What is a species?
Members of populations that either produce viable offspring or have the potential to do so
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Population and community
- Population: Group of a single species living in the same area
- Communities: Group of interacting organisms sharing the same environment
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Lincoln-Peterson method
the two visits to the study area are close enough in time so that no individuals die, are born, move into the study area(immigrate) or move out of the study area (emigrate) between visits. The model also assumes that no marks fall off animals between visits to the field site bythe researcher, and that the researcher correctly records all marks.
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Seine
Water column community
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Kick Nets
Benthic community
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YSI
- Temperature
- Dissolved oxygen
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Secchi disk
- Visbility/turbidity
- depth
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Water quality parameters
-Dissolved Oxygen (DO)-Nitrates-Salinity -Temperature-Turbidity -Flow-pH
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Know some common water quality issues and what they cause
- (low DO, eutrophication/runoff)
- Agricultural runoff
- Deforestation
- Introduced species
- Other point source pollution
- Watershed protection
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Long term vs. short term
Replication and longer observation should mean greater accuracy
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Characteristics of a wetland
- Delineation is marked area where characteristics of wetland are met
- Plants adapted for saturated soil conditions
- Drainage pattern that results in saturated soil
- Poorly drained soil with organics and mineral material in top 12 inches of soil
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Plant succession
The newcomers will, in turn, establish conditions that no longer favor them but promote the growth of still other species.
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Field vs. controlled advantages/disadvantages
- More realistic, but uncontrollable factors
- Environmental noise (ditch)
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What is phenotypic plasticity?
ability of an organism to change its phenotype in response to changes in the environment.
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What is phenotypic plasticity?
- ability of an organism to change its phenotype in response to changes in the environment.
- Changes in the expression of genes Morphology vs. environment
- Direct effect from environment i.e. Lack of nutrients => smaller sizeAdaptive responses Based off cues
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Null hypothesis**
- You can fail to reject, not accept
- Alternative hypothesis
- If you reject null hypothesis, move forward with alternative
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standard deviation
squareroot of variance
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