Functional Ecology,
Journal Year:
2024,
Volume and Issue:
38(8), P. 1739 - 1750
Published: May 21, 2024
Abstract
Increasing
human
pressures
threaten
fish
diversity,
with
potentially
severe
but
unknown
consequences
for
the
functioning
of
riverine
food
webs.
Using
a
17‐year
dataset
from
multi‐trophic
communities,
we
investigated
long‐term
effects
pressure
on
diversity
and
web
functioning.
Combining
metabolic
scaling
ecological
network
principles,
calculate
annual
energy
fluxes
through
trophic
compartments
(top‐carnivore,
mesocarnivore,
detritivore
omnivore).
Energy
link
compartments,
thus
represents
functions
such
as
carnivory,
omnivory,
herbivory
detritivory.
Species
richness
across
all
was
positively
associated
flux.
However,
species
decreased
over
time,
did
flux
at
whole‐network
level,
which
reduced
by
75%.
Human
negatively
affected
both
Moreover,
negative
impacts
have
intensified
time.
Our
results
illustrate
how
can
reduce
erode
webs,
implications
ecosystem
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Neotropical Ichthyology,
Journal Year:
2025,
Volume and Issue:
23(1)
Published: Jan. 1, 2025
Abstract
Adaptations
in
the
head
structures
of
fishes
can
influence
food
item
selection
and
consumption
aquatic
ecosystems.
In
this
study,
we
tested
relationship
between
morphology
bony
structure
(suspensorium,
mandibular,
hyoid,
branchial
arches)
items
Loricariinae
species.
We
hypothesize
that
osteological
specializations
(i.e.,
mouth)
lead
to
differential
resources.
Despite
relatively
high
trophic
similarity,
was
not
uniform
among
The
phylogenetic
reconstruction
recovered
morphological
patterns
already
expected
for
Loricariinae,
such
as
sister
taxa
Hemiodontichthys
Reganella.
Phylogenetic
characters
associated
with
shape,
width,
suspensorium,
arches
were
correlated
differences
detritus,
sediment,
invertebrates
consumption.
Specifically,
terrestrial
invertebrates,
while
suspensorium
linked
superior
plants,
invertebrates.
These
findings
suggest
specialization
loricariines
is
strongly
influenced
by
differentiation
these
structural
features.
Marine and Freshwater Research,
Journal Year:
2025,
Volume and Issue:
76(7)
Published: May 1, 2025
Context
Reservoirs
offer
diverse
ecosystem
services;
however,
in
semiarid
regions,
maintaining
these
services
and
preserving
freshwater
biodiversity
face
challenges
because
of
the
conflicts
related
to
use
water,
land
climate
changes.
Aim
This
study
aimed
develop
a
tool,
reservoirs
assessment
system
(SARAS),
assess
provided
by
reservoirs,
their
functions
habitat.
Methods
To
build
we
selected
relevant
indicators
for
constructed
scoring
classification
system.
After
that,
applied
SARAS
case
(the
reservoir
Epitácio
Pessoa)
test
it.
Key
results
has
5
sections,
8
divisions
41
indicators.
Scores
are
calculated
dividing
maximum
section
score
then
standardised
into
percentage
intervals
converted
final
scores
per
division
section,
offering
comprehensive
assessment.
Conclusions
high
potential,
providing
information
on
conservation
status
aiding
decision-making.
It
also
supports
new
research
highlighting
gaps,
such
as
lack
data
some
taxa.
Implications
can
be
continuously
fed
with
data,
improving
tool
potential.
Although
it
is
primarily
focused
widely
adaptable
other
regions
world.
Neotropical Ichthyology,
Journal Year:
2024,
Volume and Issue:
22(2)
Published: Jan. 1, 2024
Abstract
The
Tocantins-Araguaia
River
basin
hosts
an
elevated
number
of
fish
species,
and
new
species
have
been
continuously
described.
In
this
basin,
we
investigated
patterns
endemic
descriptions
examining
their
association
with
distribution
range,
altitudinal
gradient,
fluvial
hierarchy
watercourses,
sampling
effort.
For
each
collected
its
year
taxonomic
description,
geographical
coordinates
holotype,
body
size
(a
proxy
for
range),
both
altitude
effort
related
to
the
locality
holotype.
was
positively
correlated
effort,
better-sampled
regions
accumulated
more
over
time.
Moreover,
whereas
negatively
it.
While
recent
were
associated
first
third
order
streams,
older
high-order
rivers.
Therefore,
broader
distributions
tend
in
lower
altitude,
restricted
at
higher
altitudes.
Increasing
efforts
upper
seems
be
a
good
fruitful
strategy
reducing
Linnean
shortfall.
Global Change Biology,
Journal Year:
2024,
Volume and Issue:
30(10)
Published: Oct. 1, 2024
ABSTRACT
Recent
decades
have
witnessed
substantial
changes
in
freshwater
biodiversity
worldwide.
Although
research
has
shown
that
can
be
shaped
by
habitat
diversity
and
human‐induced
pressure,
the
potentials
for
interaction
between
these
drivers
at
large
spatial
extents
remain
unclear.
To
address
issues,
we
employed
a
spatially
extensive
multitrophic
fish
insect
database
from
3323
stream
sites
across
United
States,
to
investigate
ability
of
modulate
effect
human
pressure
on
richness
abundance
insects.
We
found
evidence
high
levels
were
associated
with
increased
insects
(including
whole‐assemblage
individual
trophic
guilds).
also
show
effects
tend
become
positive
diversity.
Where
is
low,
strongly
reduces
abundance,
whereas
reductions
are
attenuated
Structural
equation
modeling
revealed
reduced
diversity,
indirectly
negatively
affecting
These
findings
illustrate
that,
addition
promoting
greater
biodiversity,
may
mitigate
deleterious
pressures
two
assemblages.
Overall,
our
study
suggests
maintaining
useful
way
protect
ongoing
increases
pressure.
However,
if
continue
increase,
this
will
reduce
further
threatening
