Ecological differentiation and sympatry of cryptic species in the Sphagnum magellanicum complex (Bryophyta).
DNA barcoding
Sphagnaceae
Sphagnum diabolicum
Sphagnum divinum
Sphagnum magniae
Sphagnum medium
community assembly
peatmoss
Journal
American journal of botany
ISSN: 1537-2197
Titre abrégé: Am J Bot
Pays: United States
ID NLM: 0370467
Informations de publication
Date de publication:
12 Sep 2024
12 Sep 2024
Historique:
revised:
05
06
2024
received:
30
01
2024
accepted:
06
06
2024
medline:
15
9
2024
pubmed:
15
9
2024
entrez:
13
9
2024
Statut:
aheadofprint
Résumé
Sphagnum magellanicum (Sphagnaceae, Bryophyta) has been considered to be a single semi-cosmopolitan species, but recent molecular analyses have shown that it comprises a complex of at least seven reciprocally monophyletic groups, that are difficult or impossible to distinguish morphologically. Newly developed barcode markers and RADseq analyses were used to identify species among 808 samples from 119 sites. Molecular approaches were used to assess the geographic ranges of four North American species, the frequency at which they occur sympatrically, and ecological differentiation among them. Microhabitats were classified with regard to hydrology and shade. Hierarchical modelling of species communities was used to assess climate variation among the species. Climate niches were projected back to 22,000 years BP to assess the likelihood that the North American species had sympatric ranges during the late Pleistocene. The species exhibited parallel morphological variation, making them extremely difficult to distinguish phenotypically. Two to three species frequently co-occurred within peatlands. They had broadly overlapping microhabitat and climate niches. Barcode- versus RADseq-based identifications were in conflict for 6% of the samples and always involved S. diabolicum vs. S. magniae. These species co-occur within peatlands at scales that could permit interbreeding, yet they remain largely distinct genetically and phylogenetically. The four cryptic species exhibited distinct geographic and ecological patterns. Conflicting identifications from barcode vs. RADseq analyses for S. diabolicum versus S. magniae could reflect incomplete speciation or hybridization. They comprise a valuable study system for additional work on climate adaptation.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e16401Informations de copyright
© 2024 Botanical Society of America.
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