Journal of Marine Science and Engineering,
Год журнала:
2024,
Номер
12(9), С. 1480 - 1480
Опубликована: Авг. 26, 2024
Jeju,
the
largest
island
in
Korea,
is
most
economically
important
terms
of
marine
aquaculture.
We
investigated
viral
composition
adjacent
to
Jeju
Island
over
four
seasons
2022
and
sequenced
DNA
libraries
extracted
from
samples
March,
June,
September,
December
using
Illumina
HiSeq
2000.
obtained
212,402,
186,542,
235,441,
224,513
contigs
four-season
samples,
respectively.
Among
identified
metagenomes,
bacteriophages
were
dominant
all
samples.
Bacillus
phage
G
was
species
March
whereas
Pelagibacter
HTVC
008M
September
December.
Additionally,
number
viruses
that
infected
algal
hosts
higher
than
other
seasons.
Marine
appeared
vertebrates
such
as
fish.
Functional
analysis
MG-RAST
revealed
cell
wall-
capsule-related
metabolism
groups
activated
virulence-,
disease-,
defense-related
Conclusively,
this
study
seasonal
changes
communities
sea
Island.
Our
data
will
be
useful
identifying
emerging
pathogens
for
further
community
studies
on
organisms.
Limnology and Oceanography Letters,
Год журнала:
2024,
Номер
9(5), С. 512 - 523
Опубликована: Июль 17, 2024
Abstract
Understanding
the
patterns
of
marine
microbial
diversity
(Bacteria
+
Archaea)
is
essential,
as
variations
in
their
alpha‐
and
beta‐diversities
can
affect
ecological
processes.
Investigations
from
global
oceanographic
expeditions
basin‐wide
transects
show
positive
correlations
between
either
temperature
or
productivity,
but
these
studies
rarely
captured
seasonality,
especially
polar
regions.
Here,
using
multiannual
alpha‐diversity
data
eight
time
series
northern
southern
hemispheres,
we
that
community
richness
evenness
generally
correlate
more
strongly
with
daylength
than
chlorophyll
a
(a
proxy
for
photosynthetic
biomass).
This
pattern
observable
across
found
hemispheres
regardless
collection
method,
DNA
extraction
protocols,
targeted
16S
rRNA
hypervariable
region,
sequencing
technology,
bioinformatics
pipeline.
Environmental Microbiology Reports,
Год журнала:
2024,
Номер
16(4)
Опубликована: Июль 31, 2024
Abstract
Marine
microbial
communities
differ
genetically,
metabolically,
and
ecologically
according
to
their
lifestyle,
they
may
respond
differently
environmental
changes.
In
this
study,
we
investigated
the
seasonal
dynamics
of
bacterial
assemblies
in
free‐living
(FL)
particle‐associated
(PA)
fractions
across
a
span
6
years
Blanes
Bay
Microbial
Observatory
Northwestern
Mediterranean.
Both
lifestyles
showed
marked
seasonality.
The
trends
alpha
diversity
were
similar,
with
lower
values
spring–summer
than
autumn‐winter.
Samples
from
both
grouped
seasonally
percentage
community
variability
explained
by
measured
variables
was
comparable
(32%
FL
31%
PA).
Canonical
analyses
that
biotic
interactions
determinants
bacterioplankton
relevance
varies
depending
on
lifestyles.
Time‐decay
curves
confirmed
high
degree
predictability
fractions.
Yet,
‘seasonal’
Amplicon
Sequence
Variants
(ASVs)
(as
defined
Lomb
Scargle
time
series
analysis)
PA
represented
46%
total
relative
abundance
while
these
accounted
for
30%
fraction.
These
results
demonstrate
bacteria
inhabiting
exhibit
seasonality,
highlighting
importance
accounting
fully
comprehend
marine
prokaryotic
communities.
Limnology and Oceanography,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 14, 2025
Abstract
Viral
lysis
accounts
for
approximately
50%
of
prokaryotic
mortality,
significantly
influencing
the
diversity,
composition,
and
succession
communities.
Despite
its
importance,
specific
influence
viral
on
seasonal
dynamics
within
aquatic
ecosystems
remains
poorly
understood.
In
this
study,
we
investigated
prokaryotes
in
river–estuary–coastal
ecosystem
surrounding
Xiamen
Island
explored
environmental
factors
virus‐mediated
cell
driving
microbial
successions
across
spatiotemporal
scales.
A
taxon‐specific
was
applied
to
evaluate
contribution
variations
prokaryotes.
Our
findings
revealed
distinct
community
structure,
where
temporal‐related
factors,
spatial‐related
contribute
comparably
variation
The
controls
structures
were
determined
by
a
significant
negative
correlation
between
total
index
(CLI)
from
amplicon
sequence
variant
(ASV)
order
levels.
lytic
shaping
communities
more
pronounced
estuary–coastal
compared
river
region,
with
similar
noted.
Specific
ASVs,
such
as
ASV3
(
Nitrosopumilales
),
ASV2
Synechococcales
ASV16
ASV17
Oceanospirillales
)
correlated
CLI,
highlighting
pivotal
role
their
succession.
This
study
highlights
intricate
interplay
populations
scales,
enhancing
our
understanding
how
top‐down
(virus‐mediated
lysis)
bottom‐up
(environmental
factors)
drive
Environmental Microbiology,
Год журнала:
2023,
Номер
25(9), С. 1713 - 1727
Опубликована: Апрель 30, 2023
Marine
Bacteroidetes
that
degrade
polysaccharides
contribute
to
carbon
cycling
in
the
ocean.
Organic
matter,
including
glycans
from
terrestrial
plants,
might
enter
oceans
through
rivers.
Whether
marine
bacteria
structurally
related
diverse
sources
plants
and
algae
was
previously
unknown.
We
show
bacterium
Flavimarina
sp.
Hel_I_48
encodes
two
polysaccharide
utilization
loci
(PULs)
which
xylans
algae.
Biochemical
experiments
revealed
activity
specificity
of
encoded
xylanases
associated
enzymes
these
PULs.
Proteomics
indicated
genomic
regions
respond
glucuronoxylans
arabinoxylans.
Substrate
specificities
key
suggest
dedicated
metabolic
pathways
for
xylan
utilization.
Some
were
active
on
different
with
conserved
β-1,4-linked
xylose
main
chain.
Enzyme
consistent
growth
curves
showing
uses
xylans.
The
observed
abundance
xylan-degrading
enzyme
repertoires
genomes
other
indicates
similar
activities
are
common
here
presented
data
certain
genetically
biochemically
variable
enough
access
parts
as
well
algal
sources.
Marine Environmental Research,
Год журнала:
2023,
Номер
193, С. 106262 - 106262
Опубликована: Ноя. 18, 2023
The
interactions
between
microalgae
and
bacteria
have
recently
emerged
as
key
control
factors
which
might
contribute
to
a
better
understanding
on
how
phytoplankton
communities
assemble
respond
environmental
disturbances.
We
analyzed
partial
16S
rRNA
18S
genes
from
total
of
42
antibiotic
bioassays,
where
growth
was
assessed
in
the
presence
or
absence
an
active
bacterial
community.
A
significant
negative
impact
observed
18
positive
detected
5
cases,
non-detectable
effect
occurred
19
bioassays.
Thalasiossira
spp.,
Chlorophytes,
Vibrionaceae
Alteromonadales
were
relatively
more
abundant
samples
compared
those
observed.
Phytoplankton
diversity
lower
when
negatively
affect
their
than
beneficial.
phytoplankton-bacteria
co-occurrence
subnetwork
included
many
Chlorophyta-Alteromonadales
Bacillariophyceae-Alteromonadales
associations.
Phytoplankton-bacteria
co-exclusions
not
network,
contrasts
with
frequently
suggesting
strong
competitive
interactions.
Overall,
this
study
adds
evidence
supporting
role
microbial
communities.
Environmental Microbiology,
Год журнала:
2024,
Номер
26(3)
Опубликована: Фев. 28, 2024
Abstract
In
temperate
coastal
environments,
wide
fluctuations
of
biotic
and
abiotic
factors
drive
microbiome
dynamics.
To
link
recurrent
ecological
patterns
with
planktonic
microbial
communities,
we
analysed
a
monthly‐sampled
3‐year
time
series
16S
rRNA
amplicon
sequencing
data,
alongside
environmental
variables,
collected
at
two
stations
in
the
northern
Adriatic
Sea.
Time
multivariate
analyses
allowed
us
to
identify
three
stable,
mature
communities
(climaxes),
whose
recurrence
was
mainly
driven
by
changes
photoperiod
temperature.
Mixotrophs
(e.g.,
Ca.
Nitrosopumilus
,
SUP05
clade,
Marine
Group
II)
thrived
under
oligotrophic,
low‐light
conditions,
whereas
copiotrophs
NS4
NS5
clades)
bloomed
higher
temperatures
substrate
availability.
The
early
spring
climax
characterised
more
diverse
set
sequence
variants,
including
associated
phytoplankton‐derived
organic
matter
degradation,
photo‐auto/heterotrophic
organisms
Synechococcus
sp.,
Roseobacter
clade),
rhythmicity
linked
lengthening.
Through
identification
assemblages,
begin
delineate
typology
ecosystem
based
on
composition
functionality,
allowing
for
intercomparison
assemblages
among
different
biomes,
still
underachieved
goal
omics
era.
