Composition and Functional Diversity of Juvenile Groundfish Assemblages in the California Current
Journal of Biogeography,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 15, 2025
ABSTRACT
Aim
Long‐term
monitoring
data
at
the
biogeographic
scale
are
essential
for
developing
baselines
of
biodiversity
patterns
and
tools
to
diagnose
natural
cycles,
trends,
anomalous
events
assess
threats
from
climate
change.
However,
studies
using
these
often
limit
their
analyses
relatively
few
metrics
that
may
not
adequately
capture
breadth
biodiversity.
Here,
we
calculate
a
suite
compositional
functional
metrics—collectively
comprising
ecoscapes—to
better
resolve
assemblage‐level
responses
environmental
variability
test
spatiotemporal
lability
faunal
provinces.
Location
California
Current
Large
Marine
Ecosystem
(CCLME).
Taxon
Young‐of‐the‐year
juvenile
groundfish
assemblages
(
n
=
45
taxa).
Methods
Species
composition
abundance
two
long‐term
fisheries‐independent
surveys
were
collated
with
trait
database
pelagic
taxa.
Distinct
identified
through
cluster
analysis.
Compositional
alpha‐
beta‐level
then
calculated
characterise
identify
regional
community
turnover
in
space
time.
Results
Ecoscapes
revealed
assemblage
structure,
diversity,
1990
2023.
Canonical
CCLME
provinces
mostly
supported,
but
notable
variation
differences
across
diversity
metrics.
Highly
productive
(unproductive)
years
associated
widespread
extent
characterised
by
high
(low)
abundance.
Main
Conclusions
The
between
highlight
potential
ecoscapes
promising
applications
future
studies.
provide
explicit
links
ecosystem
functioning
services,
additional
insights
into
resilience
can
aid
rapidly
disseminate
management‐relevant
information
changing
climate.
Language: Английский
Evaluating the robustness of generalized additive models as a tool for threshold detection in variable environments
Ecosphere,
Journal Year:
2025,
Volume and Issue:
16(3)
Published: March 1, 2025
Abstract
As
global
climate
change
and
anthropogenic
activities
amplify
widespread
environmental
variability,
there
is
a
strong
need
for
management
strategies
that
incorporate
relationships
between
ecosystem
components.
This
especially
apparent
when
changes
in
drivers
cause
threshold
responses
(abrupt,
nonlinear
changes)
ecosystems.
Such
ecological
thresholds
can
provide
useful
reference
points
decisions.
However,
methods
detecting
empirical
datasets
may
fail
to
find
an
existing
threshold,
one
does
not
exist,
or
be
biased
their
estimates
of
locations.
These
types
misspecifications
result
high
conservation
socioeconomic
costs.
Simulation
studies
mitigate
these
risks
by
providing
information
about
method
performance
across
different
scenarios.
Here,
we
constructed
series
simulations
evaluate
the
robustness
detection
with
generalized
additive
models
(GAMs)
exposed
variety
common,
real‐world
data
characteristics.
GAMs
generally
performed
best
time
were
long,
observation
error
was
low,
crossed
fairly
frequently,
covariates
accounted
for.
Over
realistic
ranges
values,
frequency
crossing
had
stronger
effects
on
detectability
than
length.
Importantly,
found
depend
both
shape
relationship
statistical
definition
location.
case
study,
applied
this
dataset
relating
ocean
temperature
spatial
distribution
Pacific
hake
(
Merluccius
productus
),
largest
volume
fishery
US
West
Coast.
While
suggest
no
evidence
relationship,
our
indicated
approximately
equal
chances
true
false
given
currently
available
data.
Our
results
general
guidelines
where
likely
robust
are
context
indicator
development
ecosystem‐based
variable
world.
Language: Английский
Harnessing the value of near-term actions for achieving climate-ready fishery management
Frontiers in Marine Science,
Journal Year:
2025,
Volume and Issue:
12
Published: April 9, 2025
Climate
change
requires
managers
to
bolster
long-term
resilience
of
fisheries
and
concurrently
improve
short-term
responsiveness
management
systems
prevailing
ecological
conditions,
all
while
avoiding
unintended
harm
stocks
in
a
highly
uncertain
context.
There
has
been
substantial
effort
dedicated
developing
the
scientific
information
tools
needed
inform
climate-ready
fisheries,
yet
implementation
these
approaches
limited
United
States
system.
Meanwhile,
climate
impacts
on
are
already
occurring,
making
fish
fishing
communities
vulnerable
sudden,
often
detrimental,
changes.
is
need
accelerate
adaptation
efforts,
near-term
action
critical
even
without
full
complement
hand.
Here,
existing
were
compiled
synthesized
offer
comprehensive
structured
perspective
priority
actions
that
can
be
taken
next
1-2
years
increase
adaptability
rely
them.
From
review
there
three
main
findings:
1)
45%
implemented
this
short
timeframe,
2)
Nearly
identified
current
fishery
regulatory
framework,
3)
While
new
needed,
should
proceed
with
caution
avoid
maladaptation
choose
no-
or
low-
risk
approach
wherever
possible.
Language: Английский
Evaluating ecosystem caps on fishery yield in the context of climate stress and predation
Ecological Applications,
Journal Year:
2025,
Volume and Issue:
35(3)
Published: April 1, 2025
Abstract
Ecosystem‐based
fisheries
management
strives
to
account
for
species
interactions
and
ecosystem
processes
in
natural
resource
conservation.
In
this
context,
ecosystem‐wide
caps
on
total
fishery
catches
have
been
proposed
as
one
tool
manage
multispecies
with
an
approach.
However,
determining
effective
is
complicated
because
fish
stock
production
influenced
by
environmental
conditions,
interactions,
fishing.
Consequently,
the
implementation
of
frameworks
remains
uncommon.
We
investigated
whether
should
climate
variability
predator–prey
dynamics
achieve
objectives
complex
marine
ecosystems.
considered
example
Gulf
Alaska
(United
States),
a
North
Pacific
large
where
annual
groundfish
are
managed
using
“optimum
yield”
cap
800,000
t.
simulated
yield
12
most
abundant
commercially
valuable
stocks
under
selected
fishing
scenarios
end‐to‐end
model
(Atlantis),
which
accounts
dynamics.
found
that
was
never
projected
exceed
mt
optimum
across
mortalities.
Projected
change
led
decreased
yield,
predation
from
underexploited
predator
arrowtooth
flounder
(
Atheresthes
stomias
)
foregone
catches.
Groundfish
removals
had
negative
indirect
effects
predators,
despite
exceeding
cap,
highlighting
ineffective
may
not
protect
non‐target
species.
These
results
suggest
currently
used
be
too
high
constrain
future
low
exploitation
rates
predators.
propose
reviewed
when
productivity,
or
change.
Language: Английский
A performance measure framework for ecosystem-based management
ICES Journal of Marine Science,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 21, 2024
Abstract
Effective
management
of
ocean
resources
is
crucial
for
achieving
desired
ecological,
economic,
and
social
outcomes.
Marine
ecosystem-based
(EBM)
offers
a
comprehensive
approach
to
achieve
these
goals,
yet
its
implementation
has
been
challenging
effectiveness
unclear.
Therefore,
we
need
performance
measures
assess
the
EBM
strategies.
We
developed
semi-quantitative
assessment
framework
using
existing
indicators
from
business
project
world
(e.g.
Key
Performance
Indicators;
KPIs),
national
regional
economic
wellbeing
GDP,
food
security),
ecosystem
status
assessments
overfishing,
biodiversity)
evaluate
success
The
consists
four
main
categories:
(1)
sector
performance;
(2)
marine
status;
(3)
tradeoffs;
(4)
human
dimensions,
each
flexible
enough
accommodate
suitable
reference
points.
show
how
responds
real
case
studies
Southern
New
England,
Gulf
Maine,
Hawaiian
Islands,
USA;
Baltic
Sea;
Red
Sea,
Saudi
Arabia.
observation
that
higher
scores
in
tradeoffs
consideration
correlate
with
status.
Additionally,
dimensions
tend
lead
sectoral
scores.
Although
it
not
certain
one
leads
other,
this
suggests
functioning
as
intended.
results
there
are
many
possible
indicators,
targets,
associated
directionalities
can
be
combined
form
across
ocean-use
sectors
inform
EBM.
challenge
lies
different
operational
strengths
weaknesses
approaches.
Language: Английский