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Feeding and substrate preferences of the Japanese shore crab, hemigrapsus sanguineus / Scott R....
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Feeding and substrate preferences of the Japanese shore crab, hemigrapsus sanguineus / Scott R. Percival
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Description
Identifier
Thesis
1662
Author
Percival, Scott R
Title
Feeding
and
substrate
preferences
of the
Japanese
shore
crab
,
hemigrapsus
sanguineus
/
Scott
R
.
Percival
Publisher
Central Connecticut State University
Date of Publication
2002
Resource Type
Master's Thesis
Abstract
Hemigrapsus
sanguineus
, the
Japanese
shore
crab
,
is
native
to the
western
Pacific
Ocean
and was
first
reported
in
Long
Island
Sound
in
1992
.
Since
then,
it
has
become
firmly
established
and, in
many
locations
,
is
the
most
common
crab
in the
rocky
intertidal
zone
.
H
.
sanguineus
commonly
feeds
on a
variety
of
prey
including
the
northern
rock
barnacle
(Semibalanus
balanoides)
and
is
found
in
large
numbers
in
cobble
size
substrate
. This
study
tested
the
hypothesis
that
substrate
preference
and the
ability
to
consume
a
wide
range
of
barnacle
sizes
by
Hemigrapsus
sanguineus
may
lead
to
competition
with the
native
mud
crab
(Eurypanopeus
depressus)
and the
established
introduced
green
crab
(Carcinus
maenas)
.
Based
on
field
observations
,
experiments
were
designed
to
determine
substrate
preference
and
aspects
of the
diet
of the
crab
.
Crabs
were
collected
from
Connecticut
rocky
shores
,
sexed
, and
measured
across
the
widest
portion
of the
carapace
.
Three
size
grouping
were
created
based
on
carapace
width
(6-12
mm
,
13-19
mm
, and
20-26
mm)
in the
lab
.
Experiments
were
conducted
to
determine
the
influence
or
crab
sex
or
size
on
1)
preference
of
cobble-size
substrate
and
2)
preference
for
specific
size
ranges
of the
northern
rock
barnacle
,
Semibalanus
balanoides
, for
food
.
Individual
crabs
from
each
size
class
were
simultaneously
offered
three
different
substrate
sizes
based
(diameter
sizes
of
<1
cm
,
2
cm
, and
5
cm)
. In the
feeding
experiments
,
crabs
were
allowed
to
feed
individually
on a
range
of
sizes
of
barnacles
for
24
hours
. In the
barnacle
feeding
experiment
all
sizes
of
barnacle
were
consumed
by the
three
crab
size
classes
.
Analysis
of
variance
showed
statistically
significant
differences
among
crab
size
classes
in the
mean
size
barnacle
eaten
but
no
difference
between
the
sexes
. A
post-hoc
Scheffe
'
analysis
of the
average
size
eaten
/
average
size
offered
ratio
identified
statistically
significant
differences
in
barnacle
size
eaten
between
crab
size
class
1
and
3
and
2
and
3
.
Smaller
crabs
were
eating
barnacles
smaller
than the
average
size
offered
whereas
larger
crabs
were
eating
barnacles
larger
than the
average
size
offered
. The
largest
size
substrate
was
chosen
by
63%
of the
crabs
and
chosen
the
most
often
by
crabs
in
each
size
class
.
Males
and
females
showed
similar
substrate
selection
with
63%
of the
males
and
62%
of the
females
choosing
the
largest
substrate
. The
presence
or
absence
of
light
does
not
appear
to
affect
the
substrate
choice
.
Analysis
of the
results
(chi-square)
revealed
a
statistical
significance
relationship
between
substrate
class
and
crab
size
class
in
5
of
6
trials
. The
largest
substrate
(5
cm)
was
chosen
most
often
across
the
three
crab
classes
during
experiments
with and
without
light
. The
substrate
experiments
clearly
show
a
preference
by
H
.
sanguineus
for
largersized
particles
. These
results
are
consistent
with
several
reports
of
crabs
observed
in the
field
that
H
.
sanguineus
shows
a
preference
for the
cobble
size
substrate
.
H
.
sanguineus
demonstrated
a
feeding
preference
with
regards
to the
mean
barnacle
size
offered
. In
all
three
classes
there were
several
occasions
where
all
barnacles
, of
various
sizes
, were
consumed
. This
ability
to
clear
entire
rocks
of
barnacles
,
regardless
of
size
, in
such
a
short
period
of
time
,
may
mean
that
H
.
sanguineus
could
influence
barnacle
recruitment
and
population
size
.
Based
on
substrate
preference
and the
ability
to
consume
a
wide
range
of
barnacle
sizes
by
Hemigrapsus
sanguineus
,
I
predict
that
H
.
sanguineus
will
successfully
compete
with and
potentially
alter
the
current
distribution
of
crab
species
in the
rocky
intertidal
zone
in
southern
New
England
.
Subject
Crabs -- Long Island Sound (N.Y. and Conn.)
Introduced animals -- Long Island Sound (N.Y. and Conn.)
Department
Department of Biological Sciences
Advisor
Wilson, Kim A.
Type
Text
Digital Format
application/pdf
Language
eng
OCLC number
50658143
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