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A study on the dispersal, morphological responses, reproductive performance, and survival in …


Biology Articles » Protistology » Evolution of dispersal and life history strategies – Tetrahymena ciliates » Table 02

Table 02
- Evolution of dispersal and life history strategies – Tetrahymena ciliates

List of variables used in statistical analyses

Experiment
Variable name
Definition
Estimation method and level

Growth
K
Carrying capacity (see eqn 1)
Logistic function fitted at the replicate level to successive densities (time > 0) estimated at the picture level (5 values per time step)
  r
Growth rate (see eqn 1)
Logistic function fitted at the replicate level to successive densities (time > 0) estimated at the picture level (5 values per time step)
  Final cell density (at K)
Mean density of cells at the last time step (192 hours)
Mean of 5 pictures per replicate
  Final cell size (at K)
Mean size of cells at the last time step (192 hours)
Mean of all cells of the 5 pictures per replicate
  Final cell shape (at K)
Mean shape of cells at the last time step (192 hours)
Mean of all cells of the 5 pictures per replicate
Starvation
Survival as a density sum over time
Area between the density curve and the density at time = 0 line, starting at time = 8 h which was the mean peak density for all strains
Curves defined by successive values through time of the mean of the 5 pictures per replicate
  Mean maximal cell elongation
Difference between longest shape and start shape, expressed in percentages of start shape
Estimated on means of all cells in the 5 pictures per replicate
  Variance in maximal cell elongation
Difference between the 95th upper percentile and the mean of the shape distribution at the time when the maximal elongation is reached, expressed as percentage of the same difference at start
Estimated on means of all cells in the 5 pictures per replicate
  Elongation persistence
Sum of elongation over time, i.e. area between the shape curve and the shape at time = 0 line, starting at time = 8 h
Curves defined by successive values through time of the mean of the 5 pictures per replicate
  Frequency of putative disperser morphs
Frequency of disperser morphs observed at time = 8 h
Mean of the 5 values per replicate (recorded on each sample just after picture was taken)
Dispersal
Initial cell shape
Mean shape of cells in the initial tube
Mean of all cells of the 10 pictures per block
  Dispersal rate
Proportion of cells in the target tube at the end of the experiment
Computed as a combination of parameter values at the replicate level
  Cell elongation
Difference between mean cell shape in target tube and start tube, expressed as percentage of the shape in start tube 1
Computed as a combination of parameter values at the replicate level
Colonization
Colonization probability
Proportion of tubes where a cell population developed from the single cell added to the tube
 

1 Estimating cell elongation relative to initial shape gave nearly identical results (results not shown).


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