PMID- 32849442 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20200928 IS - 1664-302X (Print) IS - 1664-302X (Electronic) IS - 1664-302X (Linking) VI - 11 DP - 2020 TI - Microbiomes and Specific Symbionts of Social Spiders: Compositional Patterns in Host Species, Populations, and Nests. PG - 1845 LID - 10.3389/fmicb.2020.01845 [doi] LID - 1845 AB - Social spiders have remarkably low species-wide genetic diversities, potentially increasing the relative importance of microbial symbionts for host fitness. Here we explore the bacterial microbiomes of three species of social Stegodyphus (S. dumicola, S. mimosarum, and S. sarasinorum), within and between populations, using 16S rRNA gene amplicon sequencing. The microbiomes of the three spider species were distinct but shared similarities in membership and structure. This included low overall diversity (Shannon index 0.5-1.7), strong dominance of single symbionts in individual spiders (McNaughton's dominance index 0.68-0.93), and a core microbiome (>50% prevalence) consisting of 5-7 specific symbionts. The most abundant and prevalent symbionts were classified as Chlamydiales, Borrelia, and Mycoplasma, all representing novel, presumably Stegodyphus-specific lineages. Borrelia- and Mycoplasma-like symbionts were localized by fluorescence in situ hybridization (FISH) in the spider midgut. The microbiomes of individual spiders were highly similar within nests but often very different between nests from the same population, with only the microbiome of S. sarasinorum consistently reflecting host population structure. The weak population pattern in microbiome composition renders microbiome-facilitated local adaptation unlikely. However, the retention of specific symbionts across populations and species may indicate a recurrent acquisition from environmental vectors or an essential symbiotic contribution to spider phenotype. CI - Copyright (c) 2020 Busck, Settepani, Bechsgaard, Lund, Bilde and Schramm. FAU - Busck, Mette Marie AU - Busck MM AD - Section for Microbiology, Department of Biology, Aarhus University, Aarhus, Denmark. FAU - Settepani, Virginia AU - Settepani V AD - Section for Genetics, Ecology and Evolution, Department of Biology, Aarhus University, Aarhus, Denmark. FAU - Bechsgaard, Jesper AU - Bechsgaard J AD - Section for Genetics, Ecology and Evolution, Department of Biology, Aarhus University, Aarhus, Denmark. FAU - Lund, Marie Braad AU - Lund MB AD - Section for Microbiology, Department of Biology, Aarhus University, Aarhus, Denmark. FAU - Bilde, Trine AU - Bilde T AD - Section for Genetics, Ecology and Evolution, Department of Biology, Aarhus University, Aarhus, Denmark. FAU - Schramm, Andreas AU - Schramm A AD - Section for Microbiology, Department of Biology, Aarhus University, Aarhus, Denmark. LA - eng PT - Journal Article DEP - 20200731 PL - Switzerland TA - Front Microbiol JT - Frontiers in microbiology JID - 101548977 PMC - PMC7412444 OTO - NOTNLM OT - 16S sequencing OT - Borrelia OT - Mycoplasma OT - Stegodyphus OT - fluorescence in situ hybridization OT - microbiome OT - spider OT - symbiosis EDAT- 2020/08/28 06:00 MHDA- 2020/08/28 06:01 PMCR- 2020/07/31 CRDT- 2020/08/28 06:00 PHST- 2020/03/06 00:00 [received] PHST- 2020/07/14 00:00 [accepted] PHST- 2020/08/28 06:00 [entrez] PHST- 2020/08/28 06:00 [pubmed] PHST- 2020/08/28 06:01 [medline] PHST- 2020/07/31 00:00 [pmc-release] AID - 10.3389/fmicb.2020.01845 [doi] PST - epublish SO - Front Microbiol. 2020 Jul 31;11:1845. doi: 10.3389/fmicb.2020.01845. eCollection 2020.