2024-03-29T11:51:39Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1328672021-12-27T16:08:26Zcom_10261_88com_10261_8col_10261_341
http://hdl.handle.net/10261/132867
10.3389/fmicb.2016.00752
311932
Snapshot of a Bacterial Microbiome Shift during the Early Symptoms of a Massive Sponge Die-Off in the Western Mediterranean
Frontiers Media
2016
artículo
Blanquer, Andrea
Uriz, María Jesús
rp07004
Cebrian, Emma
rp06981
Galand, Pierre E.
Ircinia fasciculata
Western Mediterranean
Mass die-off
Keratose sponges
Early disease symptoms
Microbiome profiling
Microbiome shifts
Bacterial symbionts
2016-05-19
30 páginas, 7 figuras, 1 tabla.
Ocean warming is affecting marine benthic ecosystems through mass mortality events
that involve marine invertebrates, in particular bivalves, corals, and sponges. Among
these events, extensive die-offs of Ircinia fasciculata sponges have been recurrently
reported in western Mediterranean. The goal of our study was to test whether the
temperature-related mass sponge die-offs were associated with or preceded by an
early unbalanced bacterial microbiome in the sponge tissues. We took advantage of
the early detection of disease and compared the microbiomes of healthy vs. early
diseased I. fasciculata tissues. Our results showed a microbiome shift in early diseased
tissues. The abundance of Gammaproteobacteria and Acidobacteria increased and
that of Deltaproteobacteria decreased in diseased vs. healthy tissues. The change in
community composition was also noticeable at the operational taxonomic unit (OTU)
level. Diseased tissues contained more bacterial sequences previously identified in
injured or stressed sponges and corals than healthy tissues. Bacterial diversity increased
significantly in diseased tissues, which contained a higher number of low abundance
OTUs. Our results do not support the hypothesis of one particular pathogen, whether a
Vibrio or any other bacteria, triggering the Northwestern Mediterranean mass mortalities
of I. fasciculata. Our data rather suggest an early disruption of the bacterial microbiome
balance in healthy sponges through a shift in OTU abundances, and the purported
consequent decline of the sponge fitness and resistance to infections. Opportunistic
bacteria could colonize the sponge tissues, taking benefit of the sponge weakness,
before one or more virulent pathogens might proliferate ending in the mass sponge
die-off.
Frontiers in Microbiology
2016
7
752