Ecology Letters,
Год журнала:
2021,
Номер
24(11), С. 2364 - 2377
Опубликована: Авг. 22, 2021
Biodiversity-ecosystem
functioning
and
food-web
complexity-stability
relationships
are
central
to
ecology.
However,
they
remain
largely
untested
in
natural
contexts.
Here,
we
estimated
the
links
among
environmental
conditions,
richness,
structure,
annual
biomass
its
temporal
stability
using
a
standardised
monitoring
dataset
of
99
stream
fish
communities
spanning
from
1995
2018.
We
first
revealed
that
both
richness
average
trophic
level
positively
related
biomass,
with
effects
similar
strength.
Second,
found
community
is
fostered
by
mean
level,
while
contrary
expectation,
it
decreased
species
richness.
Finally,
conditions
affect
mainly
via
on
network
structure.
Strikingly,
effect
was
mediated
population
rather
than
synchrony,
which
contrasts
results
single
communities.
discuss
hypothesis
could
be
characteristic
multi-trophic
Ecological Research,
Год журнала:
2018,
Номер
33(5), С. 825 - 837
Опубликована: Май 25, 2018
Abstract
Knowledge
of
the
diet
source
and
trophic
position
organisms
is
fundamental
in
food
web
science.
Since
1980s,
stable
isotopes
light
elements
such
as
13
C
15
N
have
provided
unique
information
on
structure
a
variety
ecosystems.
More
recently,
novel
isotope
tools
heavy
elements,
radioisotopes,
compound‐specific
analysis,
been
examined
by
researchers.
Here
I
reviewed
use
nitrogen
analysis
amino
acids
(CSIA‐AA)
useful
dietary
tracer
ecology.
Its
three
key
features—(1)
offsetting
against
isotopic
variation;
(2)
universality
discrimination
factor;
(3)
sensitivity
to
mixing—were
compared
with
conventional
for
bulk
tissue
organisms.
These
advantages
CSIA‐AA
will
allow
future
researchers
(1)
estimate
integrated
(
iTP
)
animal
communities;
infer
transfer
efficiency
TTE
webs;
quantify
contributions
from
different
resources
animals,
all
which
are
crucial
understanding
relationship
between
biodiversity
multi‐trophic
ecosystem
functioning.
Further
development
ecology
be
facilitated
both
methodological
refinement
its
application
wider
range
organisms,
webs,
Abstract
Intraguild
predation
(
IGP
),
that
is,
feeding
interaction
between
two
consumers
share
the
same
resource
species,
is
commonly
observed
in
natural
food
webs.
expands
vertical
niche
space
and
slows
down
energy
flows
from
lower
to
higher
trophic
levels,
which
potentially
affects
diversity
dynamics
of
Here,
we
use
food‐web
models
investigate
effects
on
species
ecosystem
functioning.
We
first
simulate
a
five‐species
module
with
different
strengths
at
herbivore
and/or
carnivore
level.
Results
show
as
strength
within
level
increases,
biomass
its
increases
because
release;
this
increased
turn
alters
fluxes
other
levels.
These
results
are
then
extended
by
subsequent
simulations
more
diverse
As
simulated
webs
maintain
(1)
(2)
total
biomasses
(3)
larger
across
Our
challenge
intuitive
hypothesis
structure
should
maximize
efficiency
transfer
levels;
instead,
they
suggest
assembly
be
governed
balance
(of
transfer)
persistence
(i.e.,
maintenance
biomasses).
also
relationship
biodiversity
functioning
(e.g.,
or
primary
production)
much
stronger
presence
,
reconciling
contrast
recent
studies
based
food‐chain
models.
findings
shed
new
light
functional
role
contribute
resolving
debate
structure,
complex
Journal of Animal Ecology,
Год журнала:
2020,
Номер
89(6), С. 1497 - 1510
Опубликована: Март 12, 2020
The
concept
of
biodiversity-ecosystem
functioning
(BEF)
has
been
studied
over
the
last
three
decades
using
experiments,
theoretical
models
and
more
recently
observational
data.
While
revealed
that
species
richness
is
best
metric
summarizing
ecosystem
functioning,
it
clear
function
explained
by
other
variables
besides
richness.
Additionally,
rarely
focus
on
than
one
function,
limiting
to
biomass
or
production.
There
a
lack
background
verify
how
components
biodiversity
interactions
support
functioning.
Here,
simulations
from
food
web
model
based
community
assembly
process
trait-based
approach,
we
test
biodiversity,
structure
predator-prey
determine
several
functions
(biomass,
metabolism,
production
productivity).
Our
results
demonstrate
relationship
between
depends
type
considered
importance
diversity
differs
across
functions.
Particularly,
show
dominance
plays
major
role
in
determining
level
biomass,
at
least
as
important
number
species.
We
find
occurs
when
do
not
experience
strong
predation.
By
manipulating
web,
wider
trait
space
(generalist
communities)
result
connected
webs
generally
reach
same
with
less
shows
generalist
versus
specialist
communities
BEF
relationships,
such,
empirical
studies
should
quantifying
diet/habitat
use
study
provides
better
understanding
underlying
mechanisms
generates
research
hypotheses
can
be
tested
studies.
recommend
investigating
links
include
metrics
dominance,
composition,
trophic
possibly
environmental
space.
also
advise
effort
made
into
calculating
properties
data
natural
multitrophic
systems.
Ecology Letters,
Год журнала:
2021,
Номер
24(11), С. 2364 - 2377
Опубликована: Авг. 22, 2021
Biodiversity-ecosystem
functioning
and
food-web
complexity-stability
relationships
are
central
to
ecology.
However,
they
remain
largely
untested
in
natural
contexts.
Here,
we
estimated
the
links
among
environmental
conditions,
richness,
structure,
annual
biomass
its
temporal
stability
using
a
standardised
monitoring
dataset
of
99
stream
fish
communities
spanning
from
1995
2018.
We
first
revealed
that
both
richness
average
trophic
level
positively
related
biomass,
with
effects
similar
strength.
Second,
found
community
is
fostered
by
mean
level,
while
contrary
expectation,
it
decreased
species
richness.
Finally,
conditions
affect
mainly
via
on
network
structure.
Strikingly,
effect
was
mediated
population
rather
than
synchrony,
which
contrasts
results
single
communities.
discuss
hypothesis
could
be
characteristic
multi-trophic
