Microbial Ecology · 5 authors, 4 centres
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This laboratory study compared the bacterial communities of Daphnia galeata genotypes from two genetic clusters reared in a common garden. The central finding was that bacterial community composition differed between host genotypes, but this variation did not correlate with the genetic distance between the host genotypes.
The study investigated the host-associated bacterial communities in the zooplankton Daphnia galeata. Using 16S rDNA sequencing, they analyzed bacterial communities from guts, bodies, and the culturing medium. Results showed that beta diversity of gut and body bacterial communities differed significantly between genotypes, confirming a host-genetic component. However, this variation did not correlate with the genetic distance between host genotypes. ZOTU richness varied by genotype, largely driven by one divergent genotype (GR053), while Shannon Index did not vary. The bacterial communities were dominated by Betaproteobacteria in guts and Actinobacteria in the medium. A key limitation is that the study is confined to a single species in a laboratory common garden, and the functional implications of the observed genotype-specific diversity are unknown.
