Fungal-algal association patterns in lichen symbiosis linked to macroclimate

2016 ◽  
Vol 214 (1) ◽  
pp. 317-329 ◽  
Author(s):  
Garima Singh ◽  
Francesco Dal Grande ◽  
Pradeep K. Divakar ◽  
Jürgen Otte ◽  
Ana Crespo ◽  
...  
Keyword(s):  
Association Patterns ◽  
Lichen Symbiosis

scholarly journals A case study on the re-establishment of the cyanolichen symbiosis: where do the compatible photobionts come from?

2019 ◽  
Vol 124 (3) ◽  
pp. 379-388 ◽  
Author(s):  
J L H Cardós ◽  
M Prieto ◽  
M Jylhä ◽  
G Aragón ◽  
M C Molina ◽  
...  
Keyword(s):  
Fungal Spores ◽  
Free Living ◽  
Association Patterns ◽  
Genetic Analyses ◽  
Lichen Symbiosis ◽  
Ascospore Germination

AbstractBackground and AimsIn order to re-establish lichen symbiosis, fungal spores must first germinate and then associate with a compatible photobiont. To detect possible establishment limitations in a sexually reproducing cyanolichen species, we studied ascospore germination, photobiont growth and photobiont association patterns in Pectenia plumbea.MethodsGermination tests were made with ascospores from 500 apothecia under different treatments, and photobiont growth was analysed in 192 isolates obtained from 24 thalli. We determined the genotype identity [tRNALeu (UAA) intron] of the Nostoc cyanobionts from 30 P. plumbea thalli from one population. We also sequenced cyanobionts of 41 specimens of other cyanolichen species and 58 Nostoc free-living colonies cultured from the bark substrate.Key ResultsNot a single fungal ascospore germinated and none of the photobiont isolates produced motile hormogonia. Genetic analyses revealed that P. plumbea shares Nostoc genotypes with two other cyanolichen species of the same habitat, but these photobionts were hardly present in the bark substrate.ConclusionsDue to the inability of both symbionts to thrive independently, the establishment of P. plumbea seems to depend on Dendriscocaulon umhausense, the only cyanolichen species in the same habitat that reproduces asexually and acts as a source of appropriate cyanobionts. This provides support to the hypothesis about facilitation among lichens.

scholarly journals Bacterial communities in an optional lichen symbiosis are determined by substrate, not algal photobionts

2019 ◽  
Vol 95 (3) ◽  
Author(s):  
Samantha Fernández-Brime ◽  
Lucia Muggia ◽  
Stefanie Maier ◽  
Martin Grube ◽  
Mats Wedin
Keyword(s):  
Bacterial Communities ◽  
Lichen Symbiosis

Mathematical Modeling of Dynamic Cellular Association Patterns in Seminiferous Tubules

2021 ◽  
Vol 83 (4) ◽  
Author(s):  
Mari Kawamura ◽  
Kei Sugihara ◽  
Hisako Takigawa-Imamura ◽  
Toshiyuki Ogawa ◽  
Takashi Miura
Keyword(s):  
Mathematical Modeling ◽  
Seminiferous Tubules ◽  
Association Patterns

Variability in the spatial association patterns of sponge assemblages in response to environmental heterogeneity

2010 ◽  
Vol 157 (11) ◽  
pp. 2503-2509 ◽  
Author(s):  
James J. Bell ◽  
Jade Berman ◽  
Timothy Jones ◽  
Leanne J. Hepburn
Keyword(s):  
Environmental Heterogeneity ◽  
Spatial Association ◽  
Association Patterns

scholarly journals Postinoculation Protozoan Establishment and Association Patterns of Methanogenic Archaea in the Ovine Rumen

2007 ◽  
Vol 73 (14) ◽  
pp. 4609-4618 ◽  
Author(s):  
Samuel Ohene-Adjei ◽  
Ronald M. Teather ◽  
Michael Ivan ◽  
Robert J. Forster
Keyword(s):  
Phylogenetic Analysis ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Methanogenic Archaea ◽  
Type A ◽  
Negative Control ◽  
Rrna Gene ◽  
Association Patterns ◽  
Clone Libraries ◽  
Symbiotic Relationships ◽  
The Impact

ABSTRACT Association patterns between archaea and rumen protozoa were evaluated by analyzing archaeal 16S rRNA gene clone libraries from ovine rumen inoculated with different protozoa. Five protozoan inoculation treatments, fauna free (negative control), holotrich and cellulolytic protozoa, Isotricha and Dasytricha spp., Entodinium spp., and total fauna (type A) were tested. We used denaturing gradient gel electrophoresis, quantitative PCR, and phylogenetic analysis to evaluate the impact of the protozoan inoculants on the respective archaeal communities. Protozoan 18S ribosomal DNA clone libraries were also evaluated to monitor the protozoal population that was established by the inoculation. Phylogenetic analysis suggested that archaeal clones associated with the fauna-free, the Entodinium, and the type A inoculations clustered primarily with uncultured phylotypes. Polyplastron multivesiculatum was the predominant protozoan strain established by the holotrich and cellulolytic protozoan treatment, and this resulted predominantly in archaeal clones affiliated with uncultured and cultured methanogenic phylotypes (Methanosphaera stadtmanae, Methanobrevibacter ruminantium, and Methanobacterium bryantii). Furthermore, the Isotricha and Dasytricha inoculation treatment resulted primarily in archaeal clones affiliated with Methanobrevibacter smithii. This report provides the first assessment of the influence of protozoa on archaea within the rumen microbial community and provides evidence to suggest that different archaeal phylotypes associate with specific groups of protozoa. The observed patterns may be linked to the evolution of commensal and symbiotic relationships between archaea and protozoa in the ovine rumen environment. This report further underscores the prevalence and potential importance of a rather large group of uncultivated archaea in the ovine rumen, probably unrelated to known methanogens and undocumented in the bovine rumen.

Investigating Language Use Through Corpusbased Analyses of Association Patterns

1996 ◽  
Vol 1 (2) ◽  
pp. 171-197 ◽  
Author(s):  
Douglas Biber
Keyword(s):  
Language Use ◽  
Linguistic Features ◽  
Association Patterns ◽  
Research Questions ◽  
Empirical Approaches

The present paper argues that analyses of language use provide an important complementary perspective to traditional linguistic descriptions, and that empirical approaches are required for such investigations. Corpus-based techniques are particularly well suited to these research purposes, enabling investigation of research questions that were previously disregarded. Specifically, the paper discusses the use of corpus-based techniques to identify and analyze complex "association patterns": the systematic ways in which linguistic features are used in association with other linguistic and non-linguistic features. Several illustrative analyses are discussed, investigating the use of lexical features, grammatical features, and the overall patterns of variability among texts and registers.

scholarly journals Anthropogenic food patches and association patterns of Tursiops truncatus at Lampedusa island, Italy

2011 ◽  
Vol 23 (2) ◽  
pp. 254-264 ◽  
Author(s):  
Daniela Silvia Pace ◽  
Marina Pulcini ◽  
Francesca Triossi
Keyword(s):  
Tursiops Truncatus ◽  
Association Patterns ◽  
Anthropogenic Food
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