Recovery and Degradation Drive Changes in the Dispersal Capacity of Stream Macroinvertebrate Communities
Global Change Biology,
Journal Year:
2025,
Volume and Issue:
31(1)
Published: Jan. 1, 2025
ABSTRACT
Freshwater
ecosystems
face
significant
threats,
including
pollution,
habitat
loss,
invasive
species,
and
climate
change.
To
address
these
challenges,
management
strategies
restoration
efforts
have
been
broadly
implemented.
Across
Europe,
such
resulted
in
overall
improvements
freshwater
biodiversity,
but
recovery
has
stalled
or
failed
to
occur
many
localities,
which
may
be
partly
caused
by
the
limited
dispersal
capacity
of
species.
Here,
we
used
a
comprehensive
dataset
comprising
1327
time
series
macroinvertebrate
communities
ranging
from
1968
2021
across
23
European
countries
investigate
whether
changes
with
ecological
quality
riverine
systems.
Sites
experiencing
exhibited
net
gain
species
tended
containing
stronger
(e.g.,
active
aquatic
aerial
dispersers,
frequent
propensity
drift,
insects
larger
wings).
In
contrast,
sites
degradation
loss
reduction
proportion
strong
dispersers.
However,
this
response
varied
extensively
among
local
sites,
some
improving
exhibiting
no
parallel
gains
macroinvertebrates
higher
capacity.
Dispersal
pool
can
affect
success
ecosystem
projects.
Management
should
focus
on
enhancing
landscape
connectivity
create
accessible
“source”
areas
refugia
for
sensitive
taxa,
especially
as
change
reshapes
suitability.
Additionally,
biodiversity
initiatives
must
incorporate
adaptive
decision‐making
approaches
that
account
site‐specific
responses
quality.
Language: Английский
Environmental and Biological Drivers of Fish Beta Diversity and Tropical River Conservation in Northern Australia
Diversity and Distributions,
Journal Year:
2025,
Volume and Issue:
31(5)
Published: May 1, 2025
ABSTRACT
Aim
This
study
examines
how
species
traits
and
landscape
features
shape
beta
diversity
in
Northern
Australia's
freshwater
fish
communities,
with
implications
for
identifying
high‐conservation‐value
river
basins.
Location
ecosystems,
covering
58
basins
draining
into
the
Timor
Sea,
Arafura
Gulf
of
Carpentaria,
Coral
Sea.
Methods
We
analysed
four
species‐level
traits—saltwater
tolerance,
body
size,
shape,
caudal
throttle,
habitat
use—to
assess
their
influence
on
at
basin
scale.
Additionally,
we
examined
five
features—basin
area,
elevation,
terrain
slope,
ruggedness,
floodplain
connectivity—using
regression
analysis
to
identify
significant
predictors
diversity.
Results
A
total
138
freshwater‐associated
were
recorded,
including
76
freshwater‐exclusive,
27
freshwater‐brackish,
35
diadromous
species.
Saltwater
tolerance
was
a
key
driver
beta‐diversity,
showing
higher
Species
Contribution
Beta
Diversity
(SCBD)
values,
indicating
role
connecting
aquatic
communities.
Freshwater
obligates
contributed
less
SCBD,
highlighting
restricted
distributions
endemism.
Steeper,
more
rugged
had
turnover,
while
connectivity
did
not
homogenise
communities
as
expected.
Species‐rich
necessarily
correspond
lower
unique
assemblages,
high‐nestedness
dominated
by
common
Sites
intermediate
nestedness
high
alpha
act
biodiversity
reservoirs.
Main
Conclusions
complexity
Australia.
topography
strongly
distribution,
obligate
contribute
significantly
regional
Conservation
strategies
should
prioritise
compositions
reservoirs,
particularly
Daintree,
Victoria,
Daly,
Finniss,
Roper
rivers,
maintain
ecological
distinctiveness
resilience
amid
increasing
development
pressures.
Language: Английский
Phylogenetic Diversity of Live‐Bearing Fishes (Poeciliidae) Peaks on Peninsulas, Isthmuses, and in Deserts
Journal of Biogeography,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 4, 2024
ABSTRACT
Aim
Poeciliids
are
ecologically
important,
widely
used
as
pets,
and
also
have
value
model
organisms.
To
understand
diversity
within
this
family,
we
study
their
phylogenetic
(PD)
at
regional
local
scales
to
delimit
bioregions
identify
patterns
of
biodiversity.
Location
The
Americas.
Taxon
Poeciliidae
(Actinopterygii:
Cyprinodontiformes).
Methods
We
expanded
an
existing
dated
phylogeny
from
164
261
species
with
distributional
data
for
1
o
×
latitude
longitude
cells
(~111
km
2
)
conducted
a
cluster
analysis
(phylo‐jaccard
distance)
delineate
bioregions.
For
individual
cells,
mapped
richness
(SR),
(PD),
weighted
endemism
(WE)
(PE).
randomisation
tests
map
clustering
over‐representation
short‐branch
by
cell.
categorical
neo‐
palaeo‐endemism
neo‐,
palaeo‐,
mixed
super
(mixed)
endemism.
Results
delineated
six
Highest
density
PD
occurred
on
the
Isthmus
Panamá
(IOP).
At
grid‐cell
scale,
Grijalva–Usumacinta
drainage
is
hotspot
SR,
PD,
PE
WE;
IOP
has
high
PE;
Tehuantepec
(IOT)
WE
moderately
SR;
western
Hispaniola
SR.
includes
palaeoendemism,
while
widespread
in
Middle
America
Greater
Antilles.
Phylogenetic
widespread,
whereas
concentrated
Chihuahuan
Desert–Sierra
Madre
Oriental
region
Hispaniola,
both
hotspots
neoendemism.
Main
Conclusions
found
diversification
genera
intermixed
relict
(mixed
endemism).
Furthermore,
SR
were
strongly
correlated.
Centres
include
Oriental,
IOT,
(most
all)
drainage.
However,
conservation
efforts
must
occur
each
bioregion
genus.
Language: Английский