Global
changes
can
profoundly
affect
the
sex
determination
and
reproductive
output
of
marine
organisms,
disrupting
population
structure
ecosystems.
High
CO2driven
low
pH
in
context
ocean
acidification
(OA)
has
been
shown
to
severely
various
calcifiers,
but
less
is
known
about
extent
which
influences
reproduction
particularly
mollusks.
This
study
first
report
a
biased
ratio
over
multiple
generations
toward
females,
driven
by
exposure
high
CO2-induced
environments,
using
ecologically
economically
important
Portuguese
oyster
(Crassostrea
angulata)
as
model.
phenomenon,
we
term
pH-mediated
(PSD),
no
consequences
for
fecundity,
gonadal
development,
or
function
offspring.
Moreover,
PSD
persisted
into
second
year
was
inherited
across
generations.
Transcriptomic
analysis
indicates
associated
with
activation
Wnt
signaling
pathway
females
inhibition
spermiogenesis-related
functions
males.
work
expands
our
understanding
environmental
highlights
possible
impact
global
on
dynamics
mollusks
other
organisms.
Biology,
Journal Year:
2025,
Volume and Issue:
14(2), P. 132 - 132
Published: Jan. 27, 2025
The
West
Coast
rock
lobster,
Jasus
lalandii,
is
a
key
ecological
species
and
provides
an
important
fishery
resource
in
South
Africa
Namibia.
It
found
along
the
west
coast
of
southern
dynamic
Benguela
Current
upwelling
system.
low
seawater
pH
this
system
expected
to
decline
further
due
ocean
acidification
increase
terms
frequency
severity.
lobster
has
therefore
respond
frequent
rapid
changes
other
environmental
impacts
that
are
predicted
become
more
adverse
future.
Although
responses
such
conditions
known
for
mature
male
juvenile
lobsters,
there
lack
information
on
females
later
embryonic
development.
We
addressed
by
analysing
sensitivity
ovigerous
(“berried”)
female
WCRLs
their
eggs/embryos
hypercapnia
(high
pCO2,
pH)
formulated
following
research
questions:
(1)
Can
berried
swiftly
large
pH?
(2)
What
physiological
mechanisms
facilitate
potential
response
rapidly
declining
pH,
i.e.,
acute
hypercapnia?
(3)
Does
persist
during
prolonged
(4)
Are
impacted
To
investigate
this,
we
exposed
(pH
7.5)
chronic
(up
60
days
at
7.5
7.8)
hypercapnia.
applied
extracellular
acid–base
analysis,
microscopic
examination
egg
growth
development,
SEM
exoskeleton
structure
membranes.
results
revealed
efficiently
means
increasing
bicarbonate
concentrations
haemolymph.
Moreover,
embryo
development
not
hypercapnia,
but
shows
geographical
area-specific
differences.
conclude
embryos
J.
lalandii
as
resilient
previously
shown
males
juveniles.
Frontiers in Climate,
Journal Year:
2025,
Volume and Issue:
7
Published: Feb. 19, 2025
The
effects
of
climate
change,
including
temperature
and
precipitation
changes,
the
retreat
ice
sheets,
rising
sea
levels
are
more
evident
today.
It
emphasizes
that
greenhouse
gases
primary
drivers
these
changes.
In
this
context,
some
international
organizations
such
as
United
Nations
(UN)
others
have
been
making
significant
efforts
to
combat
considered
information
communication
technologies
(ICTs)
an
alternative
for
monitoring
mitigating
change.
However,
role
ICTs
in
change
has
not
analyzed
detail.
Accordingly,
article
presents
research
progress
on
evidence
effective
tools
reducing
gas
emissions
from
different
sectors.
Additionally,
provides
a
cost-benefit
analysis
ICT
applications
various
sectors,
emphasizing
Sustainable
Development
Goals
(SDGs).
Biology Open,
Journal Year:
2023,
Volume and Issue:
12(3)
Published: Jan. 30, 2023
Ocean
acidification
(OA)
resulting
from
anthropogenic
CO2
emissions
is
impairing
the
reproduction
of
marine
organisms.
While
parental
exposure
to
OA
can
protect
offspring
via
carryover
effects,
this
phenomenon
poorly
understood
in
many
invertebrate
taxa.
Here,
we
examined
how
acidified
(pH
7.40)
versus
ambient
7.72)
seawater
influenced
and
performance
across
six
gametogenic
cycles
(13
weeks)
estuarine
sea
anemone
Nematostella
vectensis.
Females
exhibited
reproductive
plasticity
under
acidic
conditions,
releasing
significantly
fewer
but
larger
eggs
compared
females
after
4
weeks
exposure,
two
four
following
spawning
despite
recovering
fecundity,
indicating
long-term
acclimatization
greater
investment
eggs.
Males
showed
no
changes
fecundity
conditions
produced
a
percentage
sperm
with
high
mitochondrial
membrane
potential
(MMP;
proxy
for
elevated
motility),
which
corresponded
higher
fertilization
rates
relative
males.
Finally,
did
not
influence
development
rates,
respiration
or
heat
tolerance.
Overall,
study
demonstrates
that
impacts
gamete
production
physiology
N.
vectensis,
suggesting
increased
individual
gametes
may
promote
fitness.
bioRxiv (Cold Spring Harbor Laboratory),
Journal Year:
2024,
Volume and Issue:
unknown
Published: June 13, 2024
Gametogenesis
is
the
process
by
which
germ
cells
differentiate
into
mature
sperm
and
oocytes,
essential
for
sexual
reproduction.
The
sex-specific
molecular
programs
that
drive
spermatogenesis
oogenesis
can
also
serve
as
sex
identification
markers.
Platynereis
dumerilii
a
research
organism
has
been
studied
in
many
areas
of
developmental
biology.
However
investigations
often
disregard
sex,
P.
juveniles
lack
dimorphism.
mechanisms
gametogenesis
segmented
worm
are
largely
unknown.
In
this
study,
we
used
RNA
sequencing
to
investigate
transcriptomic
profiles
juveniles.
Our
analysis
revealed
sex-biased
gene
expression
becomes
increasingly
pronounced
during
advanced
stages,
particularly
meiotic
phases
gametogenesis.
We
identified
conserved
genes
associated
with
spermatogenesis,
such
dmrt1,
novel
psmt,
oogenesis.
Additionally,
putative
long
non-coding
RNAs
were
upregulated
both
male
female
gametogenic
programs.
This
study
provides
foundational
resource
cell
dumerilii,
markers
identification,
offers
comparative
data
enhance
our
understanding
evolution
across
species.
Integrative and Comparative Biology,
Journal Year:
2024,
Volume and Issue:
unknown
Published: June 13, 2024
Synopsis
Marine
organisms
have
complex
life
histories.
For
broadcast
spawners,
successful
continuation
of
the
population
requires
their
small
gametes
to
make
contact
in
water
column
for
sufficiently
long
periods
fertilization
occur.
Anthropogenic
climate
change
has
been
shown
impact
success
various
marine
invertebrates,
including
sea
urchins,
which
are
key
grazers
habitats.
Gamete
performance
both
sexes
declined
when
exposed
elevated
temperatures
and/or
pCO2
levels.
Examples
reduced
included
slower
sperm
swimming
speed
and
thinning
egg
jelly
coat.
However,
such
responses
stress
were
not
uniform
between
individuals.
Such
variations
could
serve
as
basis
selection.
Fertilization
kinetics
modeled
a
particle
collision
process.
Here,
we
present
modified
model
that
incorporates
individual
more
environmentally
relevant
regime,
groups
with
different
traits
can
be
separately
tracked
mixture.
Numerical
simulations
highlight
outcomes
influenced
by
changes
gamete
they
age
presence
competition
(multiple
dams
or
sires).
These
results
importance
considering
multiple
individuals
at
time
points
during
vivo
assays.
We
also
applied
our
show
interspecific
variation
vulnerabilities
elevates
risk
hybridization.
By
making
numerical
open-source,
aim
help
us
better
understand
fate
face
enabling
community
consider
mean
variance
response
capture
adaptive
potential.
Toxics,
Journal Year:
2023,
Volume and Issue:
11(11), P. 924 - 924
Published: Nov. 11, 2023
The
continuous
and
unregulated
discharge
of
wastes
pollutants
into
the
aquatic
environment
has
required
constant
monitoring
risks
incurred
by
ecosystems.
Alarmism
arises
from
plastic
pollution
as
larger
artifacts
release
nanoscale
fragments
that
can
contact
free-living
stages
such
gametes,
embryos,
larvae.
Specifically,
interaction
between
spermatozoa,
released
in
water
externally
fertilizing
species,
surrounding
microenvironment
is
essential
for
successful
fertilization.
Activation
kinematics
movement,
proper
maintenance
ionic
balance,
chemotactism
are
processes
highly
sensitive
to
even
minimal
perturbations
caused
polystyrene
nanoplastics.
Spermatozoa
Mytilus
galloprovincialis
(M.
galloprovincialis),
an
excellent
ecotoxicological
model,
undergo
structural
(plasma
membrane
ruptures,
DNA
damage)
metabolic
(reduced
motility,
capacity)
damage
upon
exposure
50
nm
amino-modified
nanoplastics
(nPS-NH2).
Nanoplastics
diameter
(100
nm)
did
not
affect
sperm
parameters.
findings
highlighted
negative
impact
pollution,
related
nanoparticle
concentration,
could
have
on
quality
reproductive
potential
organisms,
altering
equilibrium
bioRxiv (Cold Spring Harbor Laboratory),
Journal Year:
2024,
Volume and Issue:
unknown
Published: April 8, 2024
Ocean
acidification
significantly
affects
marine
calcifiers
like
oysters,
warranting
the
study
of
molecular
mechanisms
DNA
methylation
that
contribute
to
adaptive
plasticity
in
response
environmental
change.
However,
a
consensus
has
not
been
reached
on
extent
which
modules
gene
expression,
and
turn
plasticity,
invertebrates.
In
this
study,
we
investigated
impact
pCO
2
expression
eastern
oyster,
Crassostrea
virginica
.
After
30-day
exposure
control
(572
ppm)
or
elevated
(2,827
ppm),
whole
genome
bisulfite
sequencing
(WGBS)
RNA-Seq
data
were
generated
from
adult
female
gonad
tissue
male
sperm
samples.
Although
differentially
methylated
loci
(DML)
identified
females
(89)
males
(2,916),
there
no
expressed
genes,
only
one
transcript
females.
body
impacted
other
forms
activity
sperm,
such
as
maximum
number
transcripts
per
changes
predominant
expressed.
Elevated
increased
variability
(transcriptional
noise)
but
decreased
noise
females,
suggesting
sex-specific
role
regulation.
Functional
annotation
genes
with
transcript-level
containing
DML
revealed
several
enriched
biological
processes
potentially
involved
response,
including
apoptotic
pathways
signal
transduction,
well
reproductive
functions.
Taken
together,
these
results
suggest
may
regulate
maintain
homeostasis
conditions
could
play
key
resilience
