Rare fish species in European lakes – patterns and processes
Biodiversity and Conservation,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 1, 2025
Язык: Английский
Identifying and conserving sympatric diversity in trout of the genus Salmo, with particular reference to Lough Melvin, Ireland
Ecology Of Freshwater Fish,
Год журнала:
2022,
Номер
31(2), С. 177 - 207
Опубликована: Янв. 12, 2022
Abstract
Salmonid
(Salmonidae)
sympatric
diversity
is
the
co‐occurrence,
in
a
lake
or
river,
of
two
more
reproductively
isolated
populations/subpopulations,
phenotypes
resulting
from
phenotypic
plasticity.
Sympatric
populations
can
arise
through
allopatric
and/or
evolution.
Subsequently,
lineages
occur
sympatry
due
to
independent
colonisation
anthropogenic
introduction.
divergence
often
driven
by
feeding
opportunities,
with
segregating
as
planktivorous,
benthivorous
and
piscivorous
ecotypes
(“trophic
polymorphism”),
further
segregation
occurring
depth
body
size.
Subpopulations
evolve
natal
homing
where
water
has
discrete
spawning
areas,
phenotypically
ecologically
cryptic
sympatry.
Most
known
populations/phenotypes
trout
genus
Salmo
(Eurasian
aka
brown
trout)
involve
(ferox)
lifetime
invertivorous
trout.
Segregation
on
benthic–limnetic
axis
been
poorly
studied
Eurasian
compared
other
salmonids
but
likely
commoner
than
currently
described.
While
three
populations/species
are
recognised
Lake
Ohrid
(Albania/North
Macedonia),
limited
ecological
information
available
there
only
lakes
four
described
benthic,
limnetic
trophic
segregation:
Lough
Melvin
(Ireland)
Loch
Laidon
(Scotland),
latter
having
identified
case
profundal
benthic
populations,
possibly
absence
Arctic
charr
(
Salvelinus
alpinus
)
lake.
Many
thousands
waters
yet
be
examined.
Some
extinct,
others
vulnerable
conservation
action
being
urgently
required.
This
should
ideally
based
populations/conservation
units,
lack
recognition
intraspecific
units
most
legislations
native
range
necessitates
pragmatic
approach,
species
classification,
appropriate,
integrative
taxonomy.
clearly
merit
status
formally
classified
such
if
valid
previous
name
not
available.
Язык: Английский
Population genetics of the African snakehead fishParachanna obscuraalong West Africa's water networks: Implications for sustainable management and conservation
Ecology and Evolution,
Год журнала:
2023,
Номер
13(1)
Опубликована: Янв. 1, 2023
An
essential
factor
for
aquatic
conservation
is
genetic
diversity
or
population
divergence,
which
in
natural
populations
reflects
the
interplay
between
geographical
isolation
with
restricted
gene
flow
and
local
evolution
of
populations.
The
long
geological
history
Africa
may
induce
stronger
among-population
divergence
lower
within-population
fish
African
watersheds.
As
an
example,
we
studied
structure
snakehead
Язык: Английский
The ecology and fishery of the vendace (Coregonus albula) in the Baltic Sea
Journal of Fish Biology,
Год журнала:
2023,
Номер
103(6), С. 1463 - 1475
Опубликована: Авг. 29, 2023
Brackish
water
ecosystems
often
have
high
primary
production,
intermediate
salinities,
and
fluctuating
physical
conditions
therefore
provide
challenging
environments
for
many
of
their
inhabitants.
This
is
especially
true
the
Baltic
Sea,
which
a
large
body
brackish
under
strong
anthropogenic
influence.
One
freshwater
species
that
able
to
cope
these
in
northern
Sea
vendace
(Coregonus
albula),
small
salmonid
fish.
Here,
we
review
current
knowledge
its
ecology
fishery
this
environment.
The
literature
shows
that,
by
competing
resources
with
other
planktivores
being
an
important
prey
range
larger
species,
C.
albula
plays
notable
role
ecosystem.
It
also
sustains
significant
fisheries
coastal
waters
Sweden
Finland.
We
identify
need
better
understand
populations
terms
predator-prey
interactions,
distributions
anadromous
sea
spawning
putative
(eco)morphs,
extent
gene
exchange
between
populations,
effects
climate
change
on
future.
In
regard,
recommend
strengthening
albula-related
research
management
efforts
improved
collaboration
coordination
institutions,
governmental
agencies,
fishers,
as
well
harmonization
policies
across
national
borders.
Язык: Английский
Genetic-based evaluation of management units for sustainable vendace (Coregonus albula) fisheries in a large lake system
Fisheries Research,
Год журнала:
2021,
Номер
246, С. 106173 - 106173
Опубликована: Ноя. 16, 2021
The
goal
of
the
processing
industry,
trade
and
consumers
is
to
get
eco-labelled
freshwater
fish
products
from
sustainable
fisheries
into
market
as
soon
possible.
fourth
largest
natural
lake
system
in
Europe,
Saimaa
supports
a
fishery
for
vendace
(Coregonus
albula).
Certification
requires
an
understanding
population
structure
help
determine
number
spatial
extent
management
units.
In
this
study,
we
analysed
genetic
diversity
local
populations
aimed
identify
conservation
units
vendace.
Within
Saimaa,
divergence
between
was
weak
their
did
not
follow
isolation
by
geographic
distance
pattern.
Vendace
has
potential
disperse
effectively
within
different
basins.
Even
if
observed
subtle
our
study
systems,
available
information
showed
no
significant
evidence
that
had
unique
evolutionarily
traits.
seem
have
similar
life
history
morphological
traits
whole
Central
Finland
district.
seemed
require
basin-specific
actions
conclude
one
unit
advisable.
Язык: Английский
Vendace populations on the life table: between-lake variation and the association between early life and mature survival and growth
International Journal of Limnology,
Год журнала:
2024,
Номер
60, С. 11 - 11
Опубликована: Янв. 1, 2024
The
vital
rates
related
to
reproduction
and
survival
dictate
the
resistance
persistence
of
a
population
under
perturbations.
Freshwater
fishes
perform
high
levels
phenotypic
plasticity
thus
these
may
differ
widely
between
populations
temporally
within
population.
Knowledge
their
ranges
enables
understanding
scope
predicting
effects
environmental
stressors.
Time
series
vendace
(
Coregonus
albula
)
catch
samples
from
22
lakes
were
applied
estimate
lake-specific
average
length-at-age
in
mature
age
groups
(mS).
Assuming
an
age-at-maturity
2
yr
constant
length–fecundity
relationship,
spawning
1
(firstS)
(premS,
prematurity
survival)
estimated
using
life
table
assuming
stable
state.
length
at
(L2)
varied
two-fold
populations,
<100
–
>
200
mm,
fecundity
approximately
eight-fold.
Also,
mS
considerably,
<10–70%a
−1
.
L2
positively
associated.
premS
∼30-fold
among
lakes,
<0.01
0.2%
per
yr,
being
highest
with
low
combined
mS.
range
firstS
was
even
higher,
0.01–2%.
This
between-lake
variability
seems
occur
especially
after
hatching
during
first
summer.
Its
level
is
set
by
factors
external
population,
e.g.
,
abundance
key
predators.
Persistence
early
possible
because
wide
compensation
size-
fecundity-at-age
Early
expected
decrease
due
climate
change
while
has
its
limits,
increasing
risk
local
extinctions.
Язык: Английский
Lack of panmixia of Bothnian Bay vendace - Implications for fisheries management
Frontiers in Marine Science,
Год журнала:
2022,
Номер
9
Опубликована: Ноя. 7, 2022
Overexploitation
of
fisheries
is
recognized
as
a
major
environmental
and
socioeconomic
problem
that
threats
biodiversity
ecosystem
functioning.
Inappropriate
management
policies
fish
stocks
have
been
applied
consequence
inadequate
characterization
subtle
genetic
structure
in
many
species.
In
this
study,
we
aim
to
assess
the
extent
differentiation
vendace
(
Coregonus
albula
)
collected
from
eight
locations
Bothnian
Bay,
northernmost
part
Baltic
Sea.
Specifically,
test
if
species
forms
single
panmictic
population
or
divided
into
several
genetically
distinct
units.
We
used
restriction
site-associated
DNA
sequencing
(RAD-seq)
identify
21,792
SNPs
based
on
266
individuals.
identified
clear
pattern
between
River
Kalix
other
sampling
locations,
weak
structuring
samples
Swedish
Finnish
coast.
Outlier
analysis
detected
41
putatively
under
divergent
selection,
mainly
reflecting
divergence
samples.
The
outlier
were
located
within
near
25
genes,
including
voltage-dependent
calcium
channel
subunit
alpha-2
(CACNA2D2),
cadherin
26
(CDH26)
carbonic
anhydrase
4-like
(CA4)
earlier
associated
with
salt-tolerance
salinity
stress.
Our
study
provides
first
genome-wide
perspective
Sea
rejects
hypothesis
panmixia
Bay.
As
such,
our
work
demonstrates
power
RAD-sequencing
detect
low
but
significant
relevant
for
management.
Язык: Английский
Population response of pelagic fishes (ciscoes, Coregonus spp.) to rapidly accelerated eutrophication of an originally oligotrophic deep lake
Inland Waters,
Год журнала:
2023,
Номер
13(4), С. 596 - 613
Опубликована: Окт. 2, 2023
Not
much
is
known
about
early
responses
of
pelagic
fish
populations
to
rapidly
increasing
nutrient
concentrations
in
originally
oligotrophic
lakes.
Here
we
report
on
population
parameters
a
pair
ciscoes
(Coregonus
spp.)
exposed
accelerating
eutrophication
the
deep
(69.5
m)
and
stratified
Lake
Stechlin
(NE
Germany),
which
total
phosphorus
(TP)
concentration
increased
from
15
mg
m-3
>60
within
10
years.
With
TP
concentrations,
lower
Secchi
depths,
declining
oxygen
deeper
water
layers,
higher
phytoplankton
zooplankton
biomass
were
observed.
Correlation
analyses
supported
strong
bottom-up
directed
effects
primary
secondary
producers,
negative
quality
parameters.
Annual
hydroacoustic
records
midwater
trawling
showed
an
increase
average
individual
size.
There
was
no
temporal
trend
biomass,
but
observed
cyclic
annual
fluctuations.
Diel
vertical
migration
(DVM)
amplitudes
declined,
primarily
by
occurrence
shallower
waters
than
previous
years
during
daytime.
We
propose
that
release
density-dependent
food
limitation,
due
plankton
abundances,
resulted
sizes
for
both
cisco
species,
turn
increasingly
blurs
species
discrimination
because
length
distributions
are
longer
substantially
different.
Our
data
show
value
long-term
lake
monitoring
including
surveys,
understand
initially
subtle
changes
biotic
communities,
may
precede
more
drastic
potentially
irreversible
anthropogenic
pressures.
Язык: Английский