z-logo
open-access-imgOpen Access
Lichen myco‐ and photobiont diversity and their relationships at the edge of life ( M c M urdo D ry V alleys, A ntarctica)
Author(s) -
PérezOrtega Sergio,
OrtizÁlvarez Rüdiger,
Allan Green T.G.,
los Ríos Asunción
Publication year - 2012
Publication title -
fems microbiology ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.377
H-Index - 155
eISSN - 1574-6941
pISSN - 0168-6496
DOI - 10.1111/j.1574-6941.2012.01422.x
Subject(s) - lichen , biology , bryophyte , thallus , botany , ecology , biodiversity , taxon
Lichen‐forming fungi are among the most diverse group of organisms in A ntarctica. Being poikilohydric, lichens are able to cope with harsh environmental conditions that exclude other organisms like vascular plants. The M c M urdo D ry V alleys ( V ictoria L and, C ontinental A ntarctica) are a hyperarid cold desert where macroscopic life is reduced to a few lichens and bryophyte species. We investigated the diversity of lichen‐forming fungi and their associated photobionts in three valleys ( G arwood, M arshall, and M iers). Correct identification of lichen‐forming fungi from extreme ecosystems is complicated by the presence of numerous sterile and extremely modified thalli. To overcome this problem, we used a combined approach for the identification of the species present in the area, the first involving identification by means of standard characters and the second, two DNA ‐based ( ITS region) species delimitation methods (General Mixed Y ule‐Coalescent model and genetic distances). In addition, we also used ITS sequences for the identification of the photobionts associated with the mycobionts. We studied the relationships between both bionts and assessed the degree of selectivity and specificity found in those associations. We also looked for landscape level spatial patterns in these associations. The two DNA ‐based methods performed quite differently, but 27 species of lichen‐forming fungi and five putative species of photobionts were found in the studied area. Although there was a general trend for low selectivity in the relationships, high specificity was found in some associations and differential selectivity was observed in some lichen‐forming fungi. No spatial structure was detected in the distribution of photobionts in the studied area.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.
Having issues? You can contact us here