ammonites
Basic options Subsampling options Raw data columns Subsampling columns Graphing options

Diversity curve request form

File name:
Required if you entered a name when you downloaded the data.
Time scale:
Bin size in millions of years:
Required if you selected one of the Neptune options above; otherwise ignored.
Taxonomic level:
If the family or order name is missing, use the immediate parent taxon's name instead? yes
Count references instead of taxa?
Range extant taxa through to the Recent? yes

This form allows you to request a diversity curve with assorted statistics.

  • A diversity curve shows the number of taxa that are counted in different time intervals such as epochs
  • You must download an occurrence data file before you submit this form
  • If you only want to see the raw data, press submit
  • To run a standardized subsampling analysis instead, fill out the required fields under "Subsampling options"
  • Subsampling methods and diversity measures are explained in Alroy 2010 (Paleontological Society Papers 16:55-80)
  • Note: our server is fast, but requests may still take a minute or two to process

Subsampling method:
Required for subsampling. See Alroy (2010) for a discussion of the alternatives.
Weighting exponent:
Required for occurrences-weighted subsampling, and otherwise ignored.
2.0 = occurrences-squared weighting; 0.0 = unweighted subsampling;
1.0 = simple occurrences-weighted subsampling.
Sampling quorum (for SQS) or quota of data records (for other methods):
Required for subsampling. A quorum is a fraction; a quota is a count.
Good's u options:
Count taxa     Ignore most common taxon?      Ignore largest collection?
Number of subsampling trials:
Required for subsampling.
Draw fewer collections from references yielding many of them? yes
Sampled item counts to report in subsampling curves:
Not required and can't be computed by SQS.
Print subsampling stats for intervals that do not meet the quorum or quota?
Not required.

Base (Ma) Midpoint (Ma) Sampled taxa Range-through taxa Boundary-crosser taxa
First appearances Last appearances Singletons Two timers Three timers Part timers
3T origination rate (Alroy 2008) BC origination rate (Foote 1999) 3T extinction rate BC extinction rate
One-occurrence taxa One-reference taxa Good's u
Gap analysis sampling stat (Paul 1982) Gap analysis diversity estimate
Three timer sampling stat (Alroy 2008) Three timer diversity estimate
Dominance Dominant taxon Evenness of occurrences (PIE)
Chao-2 estimate Incidence-based coverage estimate Jolly-Seber estimate
Collections Occurrences Occurrences-squared or exponentiated Specimens or individuals
Mean richness Median richness
Check all    Check counts    Check diversity estimates

Base (Ma) Midpoint (Ma) Items sampled
Median sampled diversity 1-sigma CI Mean sampled diversity
Range-through diversity Boundary-crosser diversity
First appearances Last appearances Singletons Two timers Three timers Part timers
3T origination rate BC origination rate RT origination percentage BC origination percentage
3T extinction rate BC extinction rate RT extinction percentage BC extinction percentage
Gap analysis sampling stat Gap analysis diversity estimate
Three timer sampling stat Three timer diversity estimate
Chao-2 estimate Incidence-based coverage estimate Jolly-Seber estimate Michaelis-Menten estimate
Check all    Check counts    Check diversity estimates

To compute Michaelis-Menten diversity estimates, set the diversity measure to "sampled-in-bin" and the subsampling method to "by collection (unweighted)."


Choose line colors and scalings for the variables you want to graph.

Sampled taxa
Range-through taxa
Boundary-crosser taxa
First appearances
Last appearances
Singletons
Dominance
Collections
Occurrences
Plot
Compute correlations between each pair of lines