Bryological and Lichenological Section/ABLS
Shaw, A.J. .
Biodiversity value and patterns of diversification in Sphagnum section Acutifolia.
It is axiomatic that taxa ranked at the level of species are not all
equivalent, and therefore differ in "biodiversity value."
Morphologically defined species of Sphagnum section Acutifoliawere compared with regard to levels of genetic (nucleotide) diversity
they contain, and the degree to which they are isolated from related
species. The latter was quantified in terms of stem branch length
leading to each species, estimated from phylogenetic analyses based on
sequences from eight nuclear and chloroplast loci using Bayesian
inference. Species differ substantially in molecular diversity,
and in their degree of isolation from congeners. These two
parameters of "biodiversity value" were not correlated. Analyses
of molecular variance (AMOVA) indicate that morphospecies account for
60-70% of the total molecular diversity in section Acutifolia,
with a surprising level of consistency among the eight loci.
Lineage-through-time plots suggest that the rate of effective
cladogenesis has been constant over time in the Acutifolia.
1 - Duke University, Department of Biology, 139 Biological Sciences Building, PO Box 90338, Durham, North Carolina, 27708-0338, USA
Presentation Type: Paper
Location: Ballroom 3 (Cliff Lodge)
Date: Tuesday, August 3rd, 2004
Time: 3:45 PM