Propagule size is not a good predictor for regional population subdivision or fine-scale spatial structure in lichenized fungi

Werth, Silke; Cheenacharoen, Saran; Scheidegger, Christoph

doi:10.1016/j.funbio.2013.10.009

Cited by 15 publications

(19 citation statements)

References 61 publications

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“…This may agree with the fact that reproductive structures with higher mass generally show higher survival probability, but a similar pattern still needs to be verified for lichen meiospores (Werth et al 2014). Higher lichen colonization on the examined north-facing side of the walls agrees with the dominant wind direction from the north-west quadrant, possibly supporting spore transport from the outcrops within the courtyard.…”

Section: Establishment Limitationssupporting

confidence: 55%

“…At the landscape scale, inferences from genetic population studies and spatial pattern analyses mostly supported this view, suggesting a tradeoff between a higher dispersal of meiospores, effective in landscapes with lower connectivity, and a higher establishment effectiveness of asexual diaspores in continuous landscapes (Ellis M a n u s c r i p t F o r R e v i e w 4 also able to effectively disperse and successfully establish across broad distances (Leavitt & Lumbsch 2016). Accordingly, the propagule size was shown not to be a good predictor of population genetic structures in species of Lobaria, either at local or regional spatial scales (Werth et al 2014).…”

Section: Introductionmentioning

confidence: 92%

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Dispersal patterns of meiospores shape population spatial structure of saxicolous lichens

et al. 2017

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4 Laboratorio analisi scientifica, Direzione ricerca e progetti cofinanziati, Soprintendenza per i beni e le attività culturali, Regione Autonoma Valle d'Aosta -Piazza Narbonne 3, 11100, Aosta, Italy AbstractRelationships between reproductive strategies and population spatial structure have been often suggested for lichens, but still not supported with experimental aerobiological data. For the first time, this study couples aerobiological investigations on meiospore dispersal by Caloplaca crenulatella (Nyl.) H. Olivier and Rhizocarpon geographicum (L.) DC. with the analysis of their local spatial patterns on the walls of a medieval castle in NW-Italy. During a two-year monitoring period carried out in the castle courtyard, a total of 169 polar diblastic spores, 20% of which were morphologically attributable to C. crenulatella, was detected in the mycoareosol, while muriform spores of R. geographicum were never found. Laboratory experiments confirmed that different dispersal patterns characterize the two species, the meiospores of R. geographicum being poorly discharged and only recovered at a short distance from the thalli, whereas those of C. crenulatella were more abundantly discharged, suspended and better dispersed by a moderate air flow. Such a difference was reflected on the castle walls by a random spatial pattern of C. crenulatella, while R. geographicum showed a clustered distribution. Different discharge rates and take-off limitations, possibly related to size differences between the spores, are not sufficient to explain the different colonization patterns and dynamics of the two species, and additional intrinsic and extrinsic factors likely drive the dispersal and establishment success. Nevertheless, information on the relationships between different dispersal patterns of the species and the local spatial structure of their populations may contribute to predict the recovery potential of lichen species exposed to habitat loss or disturbance, or encrusting monumental surfaces. Events of long-distance dispersal, favouring colonization of distant sites, followed by shortdistance dispersal, supporting a more local population expansion, were shown to explain the patchy lichen colonization in a former tree-less landscape (Gjerde et al. 2015). The productions of large asexual diaspores (isidia, soredia) and small sexually-generated meiospores are traditionally related to local and long distance dispersal, respectively (Hedenås et al. 2003;Leavitt & Lumbsch 2016). At the landscape scale, inferences from genetic population studies and spatial pattern analyses mostly supported this view, suggesting a tradeoff between a higher dispersal of meiospores, effective in landscapes with lower connectivity, and a higher establishment effectiveness of asexual diaspores in continuous landscapes (Ellis 2012). In-field measurements on diaspore dispersal generally showed short dispersal capabilities, but evidence on distributional ranges and phylogenetic studies suggested they are (2012) found a spatially structured pattern...

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Section: Establishment Limitationssupporting

confidence: 55%

Section: Introductionmentioning

confidence: 92%

Dispersal patterns of meiospores shape population spatial structure of saxicolous lichens

et al. 2017

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“…Since several studies show that thallus fragments are dispersed at close range by wind [ 73 – 74 ], one would expect that the species with this type of reproduction should have a marked geographic structure in its populations. However, this is not always the case; in species of Lobaria with a varying propagule size, no correlation has been found between the propagule size and the geographic structure [ 75 ]. In C .…”

Section: Discussionmentioning

confidence: 99%

Genetic variation and factors affecting the genetic structure of the lichenicolous fungus Heterocephalacria bachmannii (Filobasidiales, Basidiomycota)

2017

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Heterocephalacria bachmannii is a lichenicolous fungus that takes as hosts numerous lichen species of the genus Cladonia. In the present study we analyze whether the geographical distance, the host species or the host secondary metabolites determine the genetic structure of this parasite. To address the question, populations mainly from the Southern Europe, Southern Finland and the Azores were sampled. The specimens were collected from 20 different host species representing ten chemotypes. Three loci, ITS rDNA, LSU rDNA and mtSSU, were sequenced. The genetic structure was assessed by AMOVA, redundance analyses and Bayesian clustering methods. The results indicated that the host species and the host secondary metabolites are the most influential factors over the genetic structure of this lichenicolous fungus. In addition, the genetic structure of H. bachmannii was compared with that of one of its hosts, Cladonia rangiformis. The population structure of parasite and host were discordant. The contents in phenolic compounds and fatty acids of C. rangiformis were quantified in order to test whether it had some influence on the genetic structure of the species. But no correlation was found with the genetic clusters of H. bachmannii.

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“…Asexually reproducing lichen species disperse both their symbionts together (fungus and photosynthetic alga or cyanobacteria), but their propagules are larger compared to sexually reproducing species, which have a higher likelihood of long‐distance dispersal (Seaward, 2008). However, this broad generalization in dispersal ability and its consequences for gene flow remain contentious owing to contradictory results (Werth et al, 2014). In particular, the majority of epiphyte studies have focused on a single model species— Lobaria pulmonaria (L.) Hoffm.…”

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confidence: 99%

Microsatellite loci in two epiphytic lichens with contrasting dispersal modes: Nephroma laevigatum and N. parile (Nephromataceae)

2014

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• Premise of the study: Microsatellite markers were characterized for two epiphytic cyanolichens, Nephroma laevigatum and N. parile (Nephromataceae), and will be used to investigate population structure and estimate gene flow among populations of these two closely related species with contrasting dispersal modes.• Methods and Results: Twelve and 14 microsatellite loci were characterized for N. laevigatum and N. parile, respectively. Allele number in N. laevigatum ranged from three to 13 per locus, while in N. parile there were from two to six alleles per locus. As expected, the sexually reproducing N. laevigatum had higher genetic diversity than the predominantly asexual N. parile.• Conclusions: This new set of markers is suitable for studying population structure and providing insights into gene flow among populations and for understanding processes of diversification. Compared between the species, they will facilitate an understanding of the influence of contrasting reproductive strategies on population and community structure.

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Propagule size is not a good predictor for regional population subdivision or fine-scale spatial structure in lichenized fungi

Cited by 15 publications

References 61 publications

Dispersal patterns of meiospores shape population spatial structure of saxicolous lichens

Dispersal patterns of meiospores shape population spatial structure of saxicolous lichens

Genetic variation and factors affecting the genetic structure of the lichenicolous fungus Heterocephalacria bachmannii (Filobasidiales, Basidiomycota)

Microsatellite loci in two epiphytic lichens with contrasting dispersal modes: Nephroma laevigatum and N. parile (Nephromataceae)

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