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2016 ; 25
(14
): 3453-68
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Escape from the cryptic species trap: lichen evolution on both sides of a
cyanobacterial acquisition event
#MMPMID27037681
Schneider K
; Resl P
; Spribille T
Mol Ecol
2016[Jul]; 25
(14
): 3453-68
PMID27037681
show ga
Large, architecturally complex lichen symbioses arose only a few times in
evolution, increasing thallus size by orders of magnitude over those from which
they evolved. The innovations that enabled symbiotic assemblages to acquire and
maintain large sizes are unknown. We mapped morphometric data against an
eight-locus fungal phylogeny across one of the best-sampled thallus size
transition events, the origins of the Placopsis lichen symbiosis, and used a
phylogenetic comparative framework to explore the role of nitrogen-fixing
cyanobacteria in size differences. Thallus thickness increased by >150% and
fruiting body core volume increased ninefold on average after acquisition of
cyanobacteria. Volume of cyanobacteria-containing structures (cephalodia), once
acquired, correlates with thallus thickness in both phylogenetic generalized
least squares and phylogenetic generalized linear mixed-effects analyses. Our
results suggest that the availability of nitrogen is an important factor in the
formation of large thalli. Cyanobacterial symbiosis appears to have enabled
lichens to overcome size constraints in oligotrophic environments such as acidic,
rain-washed rock surfaces. In the case of the Placopsis fungal symbiont, this has
led to an adaptive radiation of more than 60 recognized species from related
crustose members of the genus Trapelia. Our data suggest that precyanobacterial
symbiotic lineages were constrained to forming a narrow range of phenotypes,
so-called cryptic species, leading systematists until now to recognize only six
of the 13 species clusters we identified in Trapelia.