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Species delimitation and evolution of metal bioaccumulation in the lichenized Acarospora smaragdula (Ascomycota, Fungi) complex

Wedin, Mats; Westberg, Martin LU ; Crewe, Anna T.; Tehler, Anders and Purvis, O. William (2009) In Cladistics 25(2). p.161-172
Abstract
The crustose lichenized fungi in the Acarosporaceae are splendid examples of organisms managing to survive in extremely harsh environments, such as highly mineralized rocks and low-pH habitats. Some representatives of the Acarospora smaragdula complex are known to accumulate substantial amounts of potentially toxic metals including iron and copper, resulting in populations with highly divergent coloration and morphology. These populations have often been treated as distinct species by lichen taxonomists. Parsimony and parsimony jackknifing analyses of beta-tubulin, nuclear ITS rDNA, and mtSSU rDNA sequence data sets was used to investigate the evolution of iron and copper accumulation and the production of the secondary compound norstictic... (More)
The crustose lichenized fungi in the Acarosporaceae are splendid examples of organisms managing to survive in extremely harsh environments, such as highly mineralized rocks and low-pH habitats. Some representatives of the Acarospora smaragdula complex are known to accumulate substantial amounts of potentially toxic metals including iron and copper, resulting in populations with highly divergent coloration and morphology. These populations have often been treated as distinct species by lichen taxonomists. Parsimony and parsimony jackknifing analyses of beta-tubulin, nuclear ITS rDNA, and mtSSU rDNA sequence data sets was used to investigate the evolution of iron and copper accumulation and the production of the secondary compound norstictic acid in populations within the A. smaragdula species complex in Sweden, with additional samples mainly from Norway and the UK. Phylogenetic species recognition (concordance of single-gene phylogenies) was used to investigate species delimitations. Seven species are recognized in the complex. Atypically green, copper-accumulating samples, often given species rank, do not form a distinct group but are nested within A. smaragdula s. str., indicating that this ability is widespread in this species. Rust-coloured, iron-accumulating samples form two well supported separate groups, indicating that two morphologically distinct, obligate, iron-accumulating species are present, but facultatively iron-accumulating populations occur in at least one additional species. Norstictic acid, sometimes claimed to characterize the whole A. smaragdula complex, is only present in A. smaragdula s. str. The evolutionary significance of metal accumulation in Acarospora is discussed, as is the significance of our results for the application of phylogenetic species recognition/gene tree concordance-based species recognition, and DNA barcoding. (C) The Willi Hennig Society 2009. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Cladistics
volume
25
issue
2
pages
161 - 172
publisher
Wiley-Blackwell
external identifiers
  • wos:000265032500004
  • scopus:64649104183
ISSN
1096-0031
DOI
10.1111/j.1096-0031.2009.00240.x
language
English
LU publication?
yes
id
8e768c80-c674-4dc4-ad32-8012e64fe59a (old id 1400701)
date added to LUP
2009-06-12 10:44:46
date last changed
2017-02-26 03:37:27
@article{8e768c80-c674-4dc4-ad32-8012e64fe59a,
  abstract     = {The crustose lichenized fungi in the Acarosporaceae are splendid examples of organisms managing to survive in extremely harsh environments, such as highly mineralized rocks and low-pH habitats. Some representatives of the Acarospora smaragdula complex are known to accumulate substantial amounts of potentially toxic metals including iron and copper, resulting in populations with highly divergent coloration and morphology. These populations have often been treated as distinct species by lichen taxonomists. Parsimony and parsimony jackknifing analyses of beta-tubulin, nuclear ITS rDNA, and mtSSU rDNA sequence data sets was used to investigate the evolution of iron and copper accumulation and the production of the secondary compound norstictic acid in populations within the A. smaragdula species complex in Sweden, with additional samples mainly from Norway and the UK. Phylogenetic species recognition (concordance of single-gene phylogenies) was used to investigate species delimitations. Seven species are recognized in the complex. Atypically green, copper-accumulating samples, often given species rank, do not form a distinct group but are nested within A. smaragdula s. str., indicating that this ability is widespread in this species. Rust-coloured, iron-accumulating samples form two well supported separate groups, indicating that two morphologically distinct, obligate, iron-accumulating species are present, but facultatively iron-accumulating populations occur in at least one additional species. Norstictic acid, sometimes claimed to characterize the whole A. smaragdula complex, is only present in A. smaragdula s. str. The evolutionary significance of metal accumulation in Acarospora is discussed, as is the significance of our results for the application of phylogenetic species recognition/gene tree concordance-based species recognition, and DNA barcoding. (C) The Willi Hennig Society 2009.},
  author       = {Wedin, Mats and Westberg, Martin and Crewe, Anna T. and Tehler, Anders and Purvis, O. William},
  issn         = {1096-0031},
  language     = {eng},
  number       = {2},
  pages        = {161--172},
  publisher    = {Wiley-Blackwell},
  series       = {Cladistics},
  title        = {Species delimitation and evolution of metal bioaccumulation in the lichenized Acarospora smaragdula (Ascomycota, Fungi) complex},
  url          = {http://dx.doi.org/10.1111/j.1096-0031.2009.00240.x},
  volume       = {25},
  year         = {2009},
}