Increased diversity of egg-associated bacteria on brown trout (Salmo trutta) at elevated temperatures.

Abstract:

:The taxonomic composition of egg-associated microbial communities can play a crucial role in the development of fish embryos. In response, hosts increasingly influence the composition of their associated microbial communities during embryogenesis, as concluded from recent field studies and laboratory experiments. However, little is known about the taxonomic composition and the diversity of egg-associated microbial communities within ecosystems; e.g., river networks. We sampled late embryonic stages of naturally spawned brown trout at nine locations within two different river networks and applied 16S rRNA pyrosequencing to describe their bacterial communities. We found no evidence for a significant isolation-by-distance effect on the composition of bacterial communities, and no association between neutral genetic divergence of fish host (based on 11 microsatellites) and phylogenetic distances of the composition of their associated bacterial communities. We characterized core bacterial communities on brown trout eggs and compared them to corresponding water samples with regard to bacterial composition and its presumptive function. Bacterial diversity was positively correlated with water temperature at the spawning locations. We discuss this finding in the context of the increased water temperatures that have been recorded during the last 25 years in the study area.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Wilkins LG,Rogivue A,Schütz F,Fumagalli L,Wedekind C

doi

10.1038/srep17084

subject

Has Abstract

pub_date

2015-11-27 00:00:00

pages

17084

issn

2045-2322

pii

srep17084

journal_volume

5

pub_type

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