>Deep Green - Data Matricies
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Data Availability Matrices (DAMs)

The primary purpose of the GPPRCG is to coordinate research across an open-ended, and self-selected community of researchers. One of the biggest impediments to coordinated phylogenetic research in this area is the lack of standardization of exemplar taxa and characters for study. Large data sets exist, but are only partially overlapping in the taxa studied, thus not rigorously combinable.

The first thing needed was a new kind of matrix, one that indicates clearly the places where further research is most needed. These Data Availability Matrices (DAMs), instead of the actual data, indicate whether or not the particular character information is available for a particular taxon (and in most cases, where the data are available).

They take the form of a simple table that indicates the existence of comparative data (published and unpublished) for all exemplar taxa (living and extinct). Also included are fields for comments and pointers to other entities such as literature citations and individual specialists or labs, as well as sources of living material, bulk DNA, herbarium specimens, and archival material (notes, photos, preserved or embedded material, permanent slides). Data domains are based on the interests of particular specialist groups (e.g., molecular, morphological). These domains are further subdivided along specialty (e.g., rbcL (chloroplast), 18S rRNA (nuclear), spermatozoid ultrastructure, spore morphology, wood anatomy, floral morphology, etc.). The actual data availability columns should each indicate a suite of characters that can be gathered at one time by one kind of technology (these of course will vary between groups to some extent).

The representative exemplar taxa were chosen, and given a priority ranking (a number from 1-3 with 1 high), in open discussion at several GPPRCG meetings (see minutes and summaries of these meetings, especially http://ucjeps.berkeley.edu/bryolab/GPphylo/summary1.html and http://ucjeps.berkeley.edu/bryolab/GPphylo/summary4.html for rationale for choice). We strongly suggest that anyone contemplating research in this area should consider studying these exemplar taxa, for maximum comparability with existing data.

The green plant DAMs thus summarize known data for exemplar taxa and highlight shortcomings in current knowledge and thereby pinpoint areas in need of further investigation. We welcome all suggestions and additions; send these to Brent Mishler at bmishler@socrates.berkeley.edu

Data Availability Matrices

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Data Set Web
Last Update
Chlorophyceae Data View Download not available Microsoft Excel Oct 1, 1998
Prasinophyte Data View Download not available Microsoft Word Oct 1, 1998
Charophyte Data View Download not available Microsoft Excel Oct 10, 1998
Fern Data View Download HTML Document July 26, 1997
Fossil 'Bryophyte' and Basal Vascular Plants View Download RTF Document August 15, 1996
Moss Data View Download Microsoft Excel File March 1, 1999
Lycophyte Data View Download RTF Document November 12, 1996
Fossil Basal Euphyllophytes View Download RTF Document August 15, 1996
Ferns, Sphenopsids and Psilotaceae View Download RTF Document November 12, 1996
Seed Plants minus Angiosperms View Download RTF Document August 15, 1996
Angiosperms View Download RTF Document November 18, 1996