Abstract
Rapid
urbanization
is
drastically
altering
ecosystem
processes
in
landscapes
around
the
world.
In
particular,
suburban
residential
neighborhoods
comprise
novel
ecosystems
with
water
and
nutrient
inputs
that
differ
greatly
from
surrounding
land
area.
These
impacts
generate
concern
over
sustainability
of
urban
ecosystems,
especially
whether
they
will
be
characterized
by
net
carbon
gain
or
loss
time.
To
address
this
knowledge
gap,
we
established
a
chronosequence
yards
Southern
California
to
test
how
soils
change
after
development.
We
predicted
urbanized
would
experience
shifts
physical
characteristics
microbial
function
time
consistent
ecological
succession
theory,
but
maintain
moisture
regimes
compared
undeveloped
soils,
never
“recovering”
pre‐developed
state.
different
vegetation
types
quantify
homeowner
landscaping
choices
yard
their
communities.
found
were
nutrient‐
moisture‐enriched
an
adjacent
ecosystem,
turfgrass
was
associated
higher
levels
nitrogen.
Despite
high
respiration
rates,
accumulated
nitrogen
conclude
dynamic
heterogeneous
are
highly
influenced
management
practices,
warrant
closer
study
at
small
management‐relevant
scales.
Journal of Lake Sciences,
Год журнала:
2024,
Номер
36(2), С. 523 - 535
Опубликована: Янв. 1, 2024
河流生物群落组成由多种环境因子共同作用形成,但其影响机制尚不清楚。本研究基于环境DNA技术,选择黄河流域下游4条山区河流(锦绣川、锦阳川、锦云川和三川汇合后河流)的10个样点开展大型底栖动物监测。结果发现:不同溪段水质状况有所差异,锦云川盐化程度(以电导率EC表征)和营养盐浓度较高,锦阳川抗生素浓度较高,锦绣川水质较好。山区河流大型底栖动物群落组成差异明显,锦绣川以水生昆虫为主,软体动物占比较低。其中,昆虫纲的大蚊(Tipula
abdominalis)、天角蜉(Uracanthella
punctisetae)和寡毛纲的顠体虫(Aeolosoma
sp.)是造成锦绣川与其他河流大型底栖动物群落结构差异的关键物种。冗余分析和变差分解分析结果表明,盐化、营养盐和抗生素均会对大型底栖动物群落组成产生影响。其中,EC的解释率为22.86%,营养盐中的TP、NH3-N和TN的解释率分别为20.12%、13.25%和7.81%;此外,盐化可与营养盐和抗生素通过耦合效应对大型底栖动物群落组成产生影响,贡献率分别为21.60%和16.20%;抗生素与营养盐的贡献率为19.60%。逐步判别回归模型结果显示,Margalef指数(d)受盐化(EC)和营养盐(NH3-N和NO3--N)的共同影响;随着河流中EC浓度升高,d
与NH3-N之间的正响应关系及其与NO3--N之间的负响应关系显著增强。因此,多环境因子对水生生物的影响不容忽视,在大型底栖动物生物多样性保护中应关注各类环境因子的影响贡献。;Biological
community
composition
in
rivers
is
driven
jointly
by
multiple
environmental
factors,
however,
the
mechanism
largely
unknown.
For
this,
an
eDNA-based
technology
was
used
to
investigate
macroinvertebrate
and
biodiversity
at
10
sampling
sites
from
4
mountainous
(Jinxiuchuan,
Jinyangchuan,
Jinyunchuan
after
their
confluence)
lower
Yellow
River
Basin.
Results
showed
that
water
quality
varied
different
rivers.
example,
concentrations
of
dissolved
salt
nutrients
were
higher
antibiotics
Jinyangchuan.
Compared
with
other
two
rivers,
Jinxiuchuan
had
better
quality.
The
macroinvertebrates
exhibited
significant
difference.
dominated
aquatic
insects
small
proportion
molluscs.
Among
these
organisms,
Insects
(Tipula
abdominalis
Uracanthella
punctisetae)
Oligochaeta
(Aeolosoma
sp.)
key
species
contributed
greatly
differences
between
Redundancy
analysis
(RDA)
variance
partitioning
(VPA)
revealed
salinization,
antibiotic
significantly
affected
changes
composition.
Of
electrical
conductivity
(EC)
most
important
factors
for
driving
a
contribution
rate
22.86%,
followed
TP
(20.12%),
NH3-N
(13.25%)
TN
(7.81%).
In
addition,
rates
coupling
effects
salinization
nutrient
21.60%
19.60%,
respectively,
16.20%.
Stepwise
regression
models
Margalef
index
(d)
(NH3-N
NO3--N).
As
EC
concentration
increased,
positive
response
relationship
d
NH3-N,
negative
NO3-
enhanced.
Therefore,
effect
multi-environmental
on
organisms
should
not
be
ignored,
more
attention
paid
various
protection
macroinvertebrates.
Abstract
Rapid
urbanization
is
drastically
altering
ecosystem
processes
in
landscapes
around
the
world.
In
particular,
suburban
residential
neighborhoods
comprise
novel
ecosystems
with
water
and
nutrient
inputs
that
differ
greatly
from
surrounding
land
area.
These
impacts
generate
concern
over
sustainability
of
urban
ecosystems,
especially
whether
they
will
be
characterized
by
net
carbon
gain
or
loss
time.
To
address
this
knowledge
gap,
we
established
a
chronosequence
yards
Southern
California
to
test
how
soils
change
after
development.
We
predicted
urbanized
would
experience
shifts
physical
characteristics
microbial
function
time
consistent
ecological
succession
theory,
but
maintain
moisture
regimes
compared
undeveloped
soils,
never
“recovering”
pre‐developed
state.
different
vegetation
types
quantify
homeowner
landscaping
choices
yard
their
communities.
found
were
nutrient‐
moisture‐enriched
an
adjacent
ecosystem,
turfgrass
was
associated
higher
levels
nitrogen.
Despite
high
respiration
rates,
accumulated
nitrogen
conclude
dynamic
heterogeneous
are
highly
influenced
management
practices,
warrant
closer
study
at
small
management‐relevant
scales.
