期刊
LICHENOLOGIST
卷 52, 期 4, 页码 287-303出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0024282920000225
关键词
glacial refugia; global distribution; pioneer vegetation on rock; subantarctic subregion
资金
- Austrian Science Fund (FWF) [P26638]
- Austrian Science Fund (FWF) [P26638] Funding Source: Austrian Science Fund (FWF)
Saxicolous, lecideoid lichenized fungi have a cosmopolitan distribution but, being mostly cold adapted, are especially abundant in polar and high-mountain regions. To date, little is known of their origin or the extent of their trans-equatorial dispersal. Several mycobiont genera and species are thought to be restricted to either the Northern or the Southern Hemisphere, whereas others are thought to be widely distributed and occur in both hemispheres. However, these assumptions often rely on morphological analyses and lack supporting molecular genetic data. Also unknown is the extent of regional differentiation in the southern polar regions. An extensive set of lecideoid lichens (185 samples) was collected along a latitudinal gradient at the southern end of South America. Subantarctic climate conditions were maintained by increasing the elevation of the collecting sites with decreasing latitude. The investigated specimens were placed in a global context by including Antarctic and cosmopolitan sequences from other studies. For each symbiont three markers were used to identify intraspecific variation (mycobiont: ITS, mtSSU,RPB1; photobiont: ITS, psbJ-L, COX2). For the mycobiont, the saxicolous generaLecidea,Porpidia,PoeltideaandLecidellawere phylogenetically re-evaluated, along with their photobiontsAsterochlorisandTrebouxia. For several globally distributed species groups, the results show geographically highly differentiated subclades, classified as operational taxonomical units (OTUs), which were assigned to the different regions of southern South America (sSA). Furthermore, several small endemic and well-supported clades apparently restricted to sSA were detected at the species level for both symbionts.
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