[tdwg-tapir] Abundance data
trobertson at gbif.org
Fri Nov 28 17:14:27 CET 2008
Hi T. Bar
You might consider the OBIS extensions for Darwin Core since you are
concerned with marine stuff.
SampleSize: the size of the sample from which the collection/
observation was drawn. It can be a volume (e.g. for a phytoplankton
sample), a linear distance (e.g. for a visual transect or net haul), a
surface area (e.g. for a benthic core), etc. This field must also
include the units, e.g. 200 mfor a transect, or 0.25 m^2 for a benthic
grab (use ^ to denote a superscript). Note that when multiple
collections/observations are reported from the same physical sample, a
code identifying the sample can be placed in the Field_Number field to
allow all collections/observations from a single sample to be connected.
IndividualCount is a count of specimens (e.g. not a count of
species). If you want to indicate multiple species, then you would
have a record for each along with the identification and the count of
individuals of that species.
So in the OBIS schema you have:
ObservedIndividualCount: The number of individuals (abundance) found
in a collection/record event.
On 28 Nov 2008, at 17:05, bar tomas wrote:
> Sorry if this question is misplaced in this discussion list, but I
> haven't been able to find a mailing list on the conceptual aspects
> of Darwin Core.
> I am interested to know if there are any recommendations on how to
> represent abundance in Darwin Core. I have seen some datasets using
> IndividualCount and SampleSize. For instance, for a fishing survey,
> would you use IndividualCount for the number of species in a catch,
> and SampleSize for the distance towed?
> Thank you very much
> tdwg-tapir mailing list
> tdwg-tapir at lists.tdwg.org
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