The collapse of eastern Bering Sea snow crab
Science,
Год журнала:
2023,
Номер
382(6668), С. 306 - 310
Опубликована: Окт. 19, 2023
The
snow
crab
is
an
iconic
species
in
the
Bering
Sea
that
supports
economically
important
fishery
and
undergoes
extensive
monitoring
management.
Since
2018,
more
than
10
billion
have
disappeared
from
eastern
Sea,
population
collapsed
to
historical
lows
2021.
We
link
this
collapse
a
marine
heatwave
during
2018
2019.
Calculated
caloric
requirements,
reduced
spatial
distribution,
observed
body
conditions
suggest
starvation
played
role
collapse.
mortality
event
appears
be
one
of
largest
reported
losses
motile
macrofauna
heatwaves
globally.
Язык: Английский
Those who fail to learn from history are condemned to repeat it: A perspective on current stock assessment good practices and the consequences of not following them
Fisheries Research,
Год журнала:
2023,
Номер
261, С. 106642 - 106642
Опубликована: Фев. 1, 2023
The
ideal
stock
assessment
would
be
able
to
estimate
all
of
the
key
parameters
related
population
processes
within
a
framework
that
assigns
appropriate
weight
data,
fits
data
adequately,
and
captures
sources
uncertainty
estimation,
including
model
uncertainty,
process
observation
uncertainty.
aim
good
practice
guidelines
is
avoid
pitfalls
earlier
analysis
methods,
consequently
provide
assessments
reflect
objective
scientific
information
on
which
management
decisions
can
based.
This
paper
outlines
for
component
fitting
dynamics
models
monitoring
support
decision
making,
follows
from
what
considered
(but
not
necessarily
best)
in
field.
identifies
current
best
practices
selecting
structure,
parameterizing
growth,
recruitment,
natural
mortality
stock-recruitment
relationship,
as
well
how
select
among
configurations
based
diagnostics
priors
existing
literature,
past
Center
Advancement
Population
Assessment
Methodology
(CAPAM)
workshop
reports
results
simulation
studies
explored
performances
different
ways
configure
assessments.
Язык: Английский
It is past time to use ecosystem models tactically to support ecosystem‐based fisheries management: Case studies using Ecopath with Ecosim in an operational management context
Fish and Fisheries,
Год журнала:
2023,
Номер
24(3), С. 381 - 406
Опубликована: Фев. 27, 2023
Abstract
The
implementation
of
ecosystem
management
requires
modelling
within
the
context
a
natural
resource
process.
Ecopath
with
Ecosim
(EwE)
is
most
widely
used
platform
for
investigating
dynamics
marine
ecosystems,
but
has
played
limited
role
in
fisheries
and
multi‐sector
decision‐making.
We
review
10
case
studies
that
demonstrate
use
EwE
to
support
operational
management.
models
are
being
inform
tactical
decision‐making
other
ocean
sectors,
as
well
identify
key
trade‐offs,
develop
appropriate
policy
objectives,
reconcile
conflicting
legislative
mandates
variety
ecosystems.
suggest
following
criteria
enhance
management:
(1)
clear
objective
can
be
addressed
through
modelling;
(2)
an
important
trade‐off
receptive
amenable
evaluation;
(3)
accessible
well‐documented
model
follows
best
practices;
(4)
early
iterative
engagement
among
scientists,
stakeholders,
managers;
(5)
integration
collaborative
process;
(6)
multi‐model
approach;
(7)
rigorous
Our
suggests
existing
frameworks
much
or
more
limitation
than
technical
issues
related
data
availability
uncertainty.
Ecosystem
increasingly
needed
facilitate
effective
transparent
assert
requisite
conditions
currently
exist
enhanced
strategic
Язык: Английский
Natural mortality: Theory, estimation and application in fishery stock assessment models
Fisheries Research,
Год журнала:
2023,
Номер
261, С. 106638 - 106638
Опубликована: Янв. 30, 2023
Язык: Английский
Evaluating ecosystem caps on fishery yield in the context of climate stress and predation
Ecological Applications,
Год журнала:
2025,
Номер
35(3)
Опубликована: Апрель 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.
Язык: Английский
The spatial correlation between trawl surveys and planned wind energy infrastructure on the US Northeast Continental Shelf
ICES Journal of Marine Science,
Год журнала:
2023,
Номер
unknown
Опубликована: Ноя. 2, 2023
Abstract
The
development
of
wind
energy
on
the
US
Northeast
Continental
Shelf
(NES)
may
preclude
resource-monitoring
programmes
from
continuing
in
their
original
study
designs.
We
considered
spatial
requirements
developers
and
autocorrelation
resident
species
as
a
means
to
inform
survey
mitigation.
NES
industry
were
respect
delineation
settled
lease
areas.
suggest
access
metrics
ranging
8
21
km
representing
interquartile
range
chord
distances
across
Using
data
concentrating
commercial
with
stock
assessment
requirements,
we
computed
indices
autocorrelation.
Tests
using
Moran’s
I
join
counts
statistics
significant
(p
<
0.05)
for
most
species,
suggesting
high
level
correlation
distributions.
To
characterize
scalar
extent
correlation,
variograms
fit
estimate
physical
correlated
catches.
These
spatially
well
beyond
distance
derived
area
shapes.
Sampling
by
gears
has
potential
producing
accurate
depictions
distributions
abundance
despite
restrictions
areas
place
sampling
Язык: Английский
Effects of the 2014 – 2016 marine heatwave on Steller sea lions in the Gulf of Alaska and implications for top-down forcing
Marine Ecology Progress Series,
Год журнала:
2024,
Номер
736, С. 129 - 145
Опубликована: Апрель 10, 2024
Marine
heatwaves
can
have
rapid
and
wide-reaching
biological
economic
impacts.
We
explored
the
effects
of
a
recent
severe
marine
heatwave
on
Steller
sea
lions
in
Gulf
Alaska
Southeast
using
biennial
counts
pups
non-pups
from
aerial
surveys
terrestrial
sites
between
2013
2019.
combined
count
data
with
bioenergetic
model
to
explore
potential
lion
responses
prey
populations.
Pup
production
was
anomalously
low
eastern
central
2017
following
end
2016,
33.5
17.4%
reduction
2015
values
respectively.
Based
energetic
costs
pregnancy
lactation,
these
reductions
pup
represent
an
average
difference
6121
metric
tons
2017.
Non-pup
were
No
detected
western
Gulf,
although
they
could
been
masked
by
variability
estimates.
Such
changes
non-pup
abundance
had
induce
predation
pressure
order
thousands
tens
prey,
even
when
assumed
persist
for
relatively
short
time
(1
yr
or
less).
In
addition
short-term
effects,
declining
occurred
2014-2016
heatwave,
suggesting
more
lasting
populations
top-down
forcing
regions.
Язык: Английский
Predicting Predator Abundance from Prey in Estuaries: Insights from Single and Joint Species Distribution Modeling
Estuarine Coastal and Shelf Science,
Год журнала:
2024,
Номер
unknown, С. 109083 - 109083
Опубликована: Дек. 1, 2024
Язык: Английский
Long-term population trend of northern anchovy (Engraulis mordax) in the California Current system
ICES Journal of Marine Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 28, 2024
Abstract
Ecosystem
function
and
variability
of
eastern
boundary
upwelling
systems
is
linked
to
the
population
dynamics
coastal
pelagic
fish.
Developing
models
species
over
many
decades
has
unique
challenges,
can
benefit
from
integration
multiple
disparate
sources
fisheries
resource
survey
information.
Northern
anchovy
(Engraulis
mordax)
are
vital
trophic
links
in
food
web
California
Current
Ecosystem.
Previous
studies
this
had
relatively
narrow
temporal
ranges
or
focused
on
a
single
data
source
(e.g.
larval
abundance
data).
Here,
we
combine
sets
that
have
informed
previous
studies,
into
one
integrated
statistical
catch-at-age
model
estimate
extended
biomass
recruitment
trends,
providing
comprehensive
account
1965–2021.
Our
results
consistent
with
estimates
but
show
an
earlier
peak
1970s
coincided
US
reduction
fishery.
facilitate
in-depth
analysis
environmental
drivers
influencing
successful
recruitment,
serve
parameterize
evaluate
performance
ecological
mechanistically
link
environment
distribution,
provide
basis
for
management
strategy
evaluation
stock.
Язык: Английский