Opuscula Zoologica,
Journal Year:
2023,
Volume and Issue:
54(1), P. 83 - 90
Published: Jan. 1, 2023
The
earthworm
Proctodrilus
tuberculatus
(Černosvitov,
1935)
on
the
crest
of
slopes
in
central-German
loess-edge
ramp
(Oligochaeta:
Lumbricidae).-The
distribution
(Černosvitov)
along
line
gradient
(fall
line)
(Lössrandstufe)
was
investigated.The
highest
density
ramps
reached
by
species
(max.47
adults/0.25m²)
where
fall
slope
merges
with
plateau
culmination
area.In
these
locations
occurrence
surface
runoff
is
at
its
lowest
and
percolation
into
soil
profile
highest.The
depth
luvisol
preferred
P.
lies
transition
zone
A1/Bt
horizons,
which
are
influenced
leaching
(lessivage)
conspicuously
marked
presence
many
argillans.The
dietary
strategy
apparently
a
specialisation
that
extracts
nutrition
principally
from
mineral
part
luvisols.It
seems
channels
luvisol,
filled
muddy
sediment,
advantageous
to
endogeic
as
it
moves
through
feeds.In
layer
this
probably
takes
up
pluviolessivate,
contains
microorganisms
finely
dispersed
or
unstable
organic
components.This
means
ecological
niche
determined
movements
nutritional
material
soil.Aporrectodea
caliginosa
(Sav.)
Ap.rosea
(Sav.),
were
always
found
association
loess
studied,
can
contribute
flow
nutrients
their
particles
excrement.
Soil Biology and Biochemistry,
Journal Year:
2024,
Volume and Issue:
191, P. 109324 - 109324
Published: Jan. 22, 2024
Soil
food
webs
rely
on
both
brown
and
green
energy,
i.e.,
litter
material
root-derived
resources
such
as
exudates.
Earthworms
have
traditionally
been
viewed
macro-detritivores
fuelled
by
energy
playing
a
central
role
in
nutrient
cycling
belowground
flux.
However,
the
of
for
earthworm
nutrition
remains
controversial.
We
studied
dietary
contribution
from
different
plant
functional
groups
to
earthworms
using
bulk
compound-specific
stable
isotope
analyses
microcosm
experiment
with
five
species,
grasses
legumes
monoculture
mixture,
an
unplanted
control
preventing
leaf
entering
microcosms.
The
presence
plants
consistently
depleted
13C
values
species
suggesting
that
carbon
contributed
each
species.
response
15N
was
less
consistent,
which
is
line
assumption
fuel
soil
mainly
via
carbon-based
root
These
observations
were
corroborated
essential
amino
acids
most
tissue
incorporated
bacterial-
(∼60%)
plant-derived
(∼30%),
enhancing
incorporation
resources.
high
proportion
bacterial
consistent
relative
dominance
bacteria
experimental
suggests
serve
important
link
acquisition
it
open
question
whether
feed
directly
bacteria,
residues
or
nutritional
supplementation
gut
microorganisms.
Overall,
our
results
show
when
are
available,
earthworms,
macro-detritivores,
also
incorporate
these
being
assimilated
channel,
pointing
importance
channelling
ecosystems
biomass.
