Article (Scientific journals)
Bioclimatic factors at an intrabiome scale are more limiting than cyanobiont availability for the lichen‐forming genus Peltigera
Lu, Jade; Magain, Nicolas; Miadlikowska, Jolanta et al.
2018In American Journal of Botany, 105 (7), p. 1198-1211
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Keywords :
boreal biome; cyanobiont; factors shaping spatial symbiotic associations; lichen; mutualism; Nostoc; Peltigera; symbiotic specificity
Abstract :
[en] Premise of the Study Factors shaping spatiotemporal patterns of associations in mutualistic systems are poorly understood. We used the lichen‐forming fungi Peltigera and their cyanobacterial partners Nostoc to investigate the spatial structure of this symbiosis at an intrabiome scale and to identify potential factors shaping these associations. Methods Ninety‐three thalli were sampled in Québec, Canada, along a south–north and an east–west transect of ~1300 km each. We identified the two main partners (Peltigera species and Nostoc phylogroups) using molecular markers and modeled the effects of environmental variables and partner occurrence on Peltigera–Nostoc distributions. Key Results Peltigera species showed a high degree of specialization toward cyanobionts, whereas two Nostoc phylogroups dominated both transects by associating with several Peltigera species. Peltigera species had narrower ranges than these two main cyanobionts. Distributions of three Peltigera species were highly associated with precipitation and temperature variables, which was not detected for Nostoc phylogroups at this spatial scale. Conclusions For these cyanolichens, factors driving patterns of symbiotic associations are scale dependent. Contrary to global‐scale findings, generalist Peltigera species were not more widespread within the boreal biome than specialists. Nostoc availability was not the only driver of Peltigera species’ geographic ranges; environmental factors also contributed to their intrabiome distributions. Climatic conditions (especially precipitation) limited the range of some Peltigera species more than the range of their cyanobacterial partners at an intrabiome (boreal) scale.
Disciplines :
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Lu, Jade;  Duke University > Biology
Magain, Nicolas  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Biologie de l'évolution et de la conservation - aCREA-Ulg
Miadlikowska, Jolanta;  Duke University > Biology
Coyle, Jessica R.;  Stanford > Biology
Truong, Camille;  Duke University > Biology
Lutzoni, François;  Duke University > Biology
Language :
English
Title :
Bioclimatic factors at an intrabiome scale are more limiting than cyanobiont availability for the lichen‐forming genus Peltigera
Publication date :
12 July 2018
Journal title :
American Journal of Botany
ISSN :
0002-9122
eISSN :
1537-2197
Publisher :
Botanical Society of America, United States - Missouri
Volume :
105
Issue :
7
Pages :
1198-1211
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 26 September 2018

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