Molecular Ecology,
Journal Year:
2019,
Volume and Issue:
28(6), P. 1394 - 1411
Published: Jan. 11, 2019
Abstract
Genetic
divergence
among
populations
arises
through
natural
selection
or
drift
and
is
counteracted
by
connectivity
gene
flow.
In
sympatric
populations,
isolating
mechanisms
are
thus
needed
to
limit
the
homogenizing
effects
of
flow
allow
for
adaptation
speciation.
Chromosomal
inversions
act
as
an
important
mechanism
maintaining
barriers,
yet
their
role
in
with
not
entirely
understood.
Here,
we
revisit
question
whether
play
a
connected
marine
fish
Atlantic
cod
(
Gadus
morhua
),
exploring
unique
data
set
combining
whole‐genome
sequencing
behavioural
obtained
acoustic
telemetry.
Within
confined
fjord
environment,
find
three
genetically
differentiated
types
belonging
oceanic
North
Sea
population,
western
Baltic
population
local
fjord‐type
cod.
Continuous
tracking
over
4
year
revealed
temporally
stable
sympatry
these
within
fjord.
Despite
overall
weak
genetic
differentiation
consistent
high
levels
flow,
detected
significant
frequency
shifts
previously
identified
inversions,
indicating
adaptive
barrier
addition,
indicated
that
individuals
homozygous
LG
12
inversion
had
lower
fitness
environment.
However,
also
occupy
different
depths,
possibly
contributing
prezygotic
reproductive
isolation
representing
Our
results
provide
first
insights
into
complex
interplay
genomic
barriers
establish
new
model
system
towards
understanding
structural
variants
diversification.
Evolutionary Applications,
Journal Year:
2019,
Volume and Issue:
12(10), P. 1881 - 1899
Published: July 29, 2019
Resolving
stock
structure
is
crucial
for
fisheries
conservation
to
ensure
that
the
spatial
implementation
of
management
commensurate
with
biological
population
units.
To
address
this
in
economically
important
European
lobster
(Homarus
gammarus),
genetic
was
explored
across
species'
range
using
a
small
panel
single
nucleotide
polymorphisms
(SNPs)
previously
isolated
from
restriction-site-associated
DNA
sequencing;
these
SNPs
were
selected
maximize
differentiation
at
both
broad
and
fine
scales.
After
quality
control
filtering,
1,278
lobsters
38
sampling
sites
genotyped
79
SNPs.
The
results
revealed
pronounced
phylogeographic
break
between
Atlantic
Mediterranean
basins,
while
within
also
apparent,
partitioned
central
Aegean
Sea.
In
addition,
cline
north-east
putatively
neutral
outlier
SNPs,
but
precise
driver(s)
clinal
pattern-isolation
by
distance,
secondary
contact,
selection
an
environmental
gradient,
or
combination
factors-remains
undetermined.
Putatively
markers
differentiated
Oosterschelde,
estuary
on
Dutch
coast,
finding
likely
explained
past
bottlenecks
limited
gene
flow
adjacent
North
Sea
populations.
Building
findings
our
analysis,
we
able
test
accuracy
assigning
various
scales,
including
basin
origin
(Atlantic
Mediterranean),
region
location.
predictive
model
assembled
correctly
assigned
99.7%
not
used
build
their
origin,
decreased
again
These
are
direct
relevance
managers
hatcheries,
provide
basis
tool
tracing
food
supply
chain.
ICES Journal of Marine Science,
Journal Year:
2023,
Volume and Issue:
80(1), P. 173 - 184
Published: Jan. 1, 2023
Abstract
We
developed
and
validated
a
mixed-stock
analysis
(MSA)
method
with
59
single-nucleotide
polymorphisms
selected
from
genome-wide
data
to
assign
individuals
populations
in
samples
of
Atlantic
herring
the
North
Baltic
seas.
analysed
3734
spawning
locations
scientific
catches
mixed
feeding
stocks
demonstrate
“one-fits-all”
tool
unprecedented
accuracy
for
monitoring
spatio-temporal
dynamics
throughout
large
geographical
range
complex
stock
mixing.
re-analysed
time-series
(2002–2021)
compared
inferences
about
composition
estimates
morphological
data.
show
that
contributions
western
spring-spawning
complex,
which
is
under
management
concern,
have
likely
been
overestimated.
also
genetically
distinctive
population
autumn
spawners,
ascribed
low
fisheries
importance,
contributes
non-negligible
potentially
temporally
increasing
proportions
aggregations,
calling
re-evaluation
definitions.
MSA
can
be
implemented
assessment
variety
applications,
including
marine
ecosystem
description,
impact
specific
fleets,
stock-rebuilding
plans.
Annual Review of Animal Biosciences,
Journal Year:
2023,
Volume and Issue:
12(1), P. 1 - 20
Published: Oct. 31, 2023
Maintenance
of
genetic
diversity
in
marine
fishes
targeted
by
commercial
fishing
is
a
grand
challenge
for
the
future.
Most
these
species
are
abundant
and
therefore
important
ecosystems
food
security.
Here,
we
present
road
map
how
population
genomics
can
promote
sustainable
fisheries.
In
species,
development
reference
genomes
whole
genome
sequencing
key,
because
differentiation
at
neutral
loci
usually
low
due
to
large
sizes
gene
flow.
First,
baseline
allele
frequencies
representing
genetically
differentiated
populations
within
must
be
established.
These
then
used
accurately
determine
composition
mixed
samples,
forming
basis
demographic
analysis
inform
sustainably
set
fish
quotas.
SNP-chip
cost-effective
method
determining
identification
samples.
Finally,
describe
marker
transform
stock
management.
Ecology and Evolution,
Journal Year:
2021,
Volume and Issue:
11(16), P. 11477 - 11490
Published: July 26, 2021
Abstract
Coexistence
of
ecotypes,
genetically
divergent
population
units,
is
a
widespread
phenomenon,
potentially
affecting
ecosystem
functioning
and
local
food
web
stability.
In
coastal
Skagerrak,
Atlantic
cod
(
Gadus
morhua
)
occur
as
two
such
coexisting
ecotypes.
We
applied
combination
acoustic
telemetry,
genotyping,
stable
isotope
analysis
to
72
individuals
investigate
movement
ecology
niche
putative
“Fjord”
oceanic
“North
Sea”
ecotypes—thus
named
based
on
previous
molecular
studies.
Genotyping
individual
origin
assignment
suggested
41
were
Fjord
31
North
Sea
Both
ecotypes
found
throughout
the
fjord.
Seven
percent
ecotype
left
study
system
during
while
42%
left,
homing
natal
spawning
grounds.
Home
range
sizes
similar
for
but
highly
variable
among
individuals.
had
significantly
higher
δ
13
C
15
N
values
than
cod,
suggesting
they
exploited
different
niches.
The
results
suggest
may
possess
innate
differences
in
feeding
ecologies
thus
fill
functional
roles
marine
ecosystems.
This
highlights
importance
conserving
interconnected
populations
ensure
structures.
Evolutionary Applications,
Journal Year:
2022,
Volume and Issue:
15(7), P. 1162 - 1176
Published: May 22, 2022
Identifying
how
physical
and
biotic
factors
shape
genetic
connectivity
among
populations
in
time
space
is
essential
to
our
understanding
of
the
evolutionary
trajectory
as
well
management
marine
species.
Atlantic
cod
a
widespread
commercially
important
species
displaying
several
ecotypes
with
different
life
history
strategies.
Using
three
sets
SNPs:
neutral,
informative,
genome-inversion
linked,
we
studied
population
structure
~2500
coastal
(CC)
from
40
locations
along
Norway's
2500
km
coastline,
including
nine
fjords.
We
observed:
(1)
cline,
suggesting
mechanism
isolation
by
distance,
characterized
declining
Wellcome Open Research,
Journal Year:
2025,
Volume and Issue:
9, P. 189 - 189
Published: April 28, 2025
We
present
a
genome
assembly
from
an
individual
male
Gadus
morhua
(the
Atlantic
cod;
Chordata;
Actinopteri;
Gadiformes;
Gadidae).
The
sequence
is
669.9
megabases
in
span.
Most
of
the
scaffolded
into
23
chromosomal
pseudomolecules.
Gene
annotation
this
on
Ensembl
identified
23,515
protein
coding
genes.
Ecology and Evolution,
Journal Year:
2018,
Volume and Issue:
8(24), P. 12547 - 12558
Published: Dec. 1, 2018
Abstract
The
use
of
genetic
markers
under
putative
selection
in
population
studies
carries
the
potential
for
erroneous
identification
populations
and
misassignment
individuals
to
origin.
Selected
are
nevertheless
attractive,
especially
marine
organisms
that
characterized
by
weak
structure
at
neutral
loci.
Highly
fecund
species
may
tolerate
cost
strong
selective
mortality
during
early
life
stages,
potentially
leading
a
shift
offspring
genotypes
away
from
parental
proportions.
In
Atlantic
cod,
recent
have
uncovered
different
genotype
clusters
apparently
representing
phenotypically
cryptic
coexist
coastal
waters.
Here,
we
tested
if
high‐graded
SNP
panel
specifically
designed
classify
individual
cod
origin
be
unreliable
because
natural
acting
on
SNPs
or
their
linked
background.
Temporal
samples
were
collected
two
fjords,
starting
earliest
stage
(pelagic
eggs)
carried
until
late
autumn
(bottom‐settled
juveniles),
covering
period
summer
high
mortality.
Despite
study
period,
found
no
evidence
selection,
as
both
types
occurred
throughout
season,
already
egg
samples,
there
was
season
proportions
one
other
type.
We
conclude
marker
panels
represent
valid
useful
tool
identifying
biological
this
highly
presumably
others.
