Crustaceana,
Год журнала:
2021,
Номер
94(10), С. 1235 - 1262
Опубликована: Окт. 27, 2021
Abstract
We
compiled
known
occurrence
records
of
seven
species
crabs
identified
in
the
literature
and
one
documented
this
report
as
having
undergone
range
extensions
southern
Africa.
Of
these
eight
species,
six
(
Austruca
occidentalis
,
Neosarmatium
africanum
Ocypode
ceratophthalmus
Portunus
segnis
Tubuca
urvillei
Varuna
litterata
)
have
extended
their
ranges
either
across
a
major
biogeographic
boundary
that
separates
subtropical
warm
temperate
ecoregions
coast,
or
into
estuaries
historically
lack
mangrove
forests.
For
seventh
eighth
Charybdis
smithii
Scylla
serrata
we
were
unable
to
find
any
distributional
data
supported
poleward
extension.
In
addition,
contribute
first
record
blue
swimming
crab,
P.
from
south
coast
South
This
early
detection
is
likely
be
part
an
ongoing
regional
trend
tropical-adapted
brachyuran
crab
extending
ecoregions.
The
pet
trade
is
one
of
the
most
important
pathways
by
which
small
mammals
are
introduced
to
non-native
areas.
To
prevent
introduction
and
invasion
pets,
an
impact
assessment
protocol
useful
in
understanding
pets
might
have
potential
negative
impacts
should
they
escape
or
be
released
from
captivity.
In
this
study,
we
used
Generic
Impact
Scoring
System
(GISS)
assess
effects
associated
with
24
mammal
species
sold
South
African
trade.
European
rabbits
Oryctolagus
cuniculus
,
house
mice
Mus
musculus
Norwegian
rats
Rattus
norvegicus
eastern
grey
squirrels
Sciurus
carolinensis
had
highest
for
both
socio-economic
environmental
categories.
We
found
no
statistically
significant
difference
between
overall
scores.
Impacts
on
agricultural
animal
production
(livestock)
were
main
mechanisms
category,
while
animals
(predation),
competition
hybridisation
prevailed
impacts.
high
strictly
regulated
establishment
feral
populations
Africa.
Ecology and Evolution,
Год журнала:
2021,
Номер
11(14), С. 9361 - 9369
Опубликована: Июнь 24, 2021
Abstract
Biological
invasions
are
a
serious
problem
in
natural
ecosystems.
Local
species
that
potential
prey
of
invasive
alien
predators
can
be
threatened
by
their
inability
to
recognize
predator
cues.
Such
an
the
presence
supports
naïve
hypothesis.
We
exposed
eggs
damselfly,
Ischnura
elegans
,
four
treatments:
water
with
no
cue
(control),
native
(perch),
(spinycheek
crayfish)
is
present
damselfly
sampling
site,
and
(signal
absent
site
but
expected
invade
it.
measured
egg
development
time,
mortality
between
ovipositing
hatching,
hatching
synchrony.
Eggs
took
longer
develop
signal
crayfish
group
(however,
this
group,
we
also
observed
high
green
algae
growth),
there
was
trend
shorter
time
spinycheek
than
control
group.
There
difference
perch
Neither
nor
synchrony
differed
groups.
suggest
response
could
general
stress
reaction
unfamiliar
or
artifact
due
The
caused
predation
on
nature.
lack
larvae
rather
eggs.
differences
responses
alternative
cues
have
important
implications
for
understanding
how
insects
responds
biological
invasions,
starting
from
stage.
South African Journal of Science,
Год журнала:
2020,
Номер
116(1/2)
Опубликована: Янв. 28, 2020
CITATION:
Somers,
M.
J.
et
al.
2020.
The
implications
of
the
reclassification
South
African
wildlife
species
as
farm
animals.
Journal
Science,
116(1/2):7724,
doi:10.17159/sajs.2020/7724.
Journal of Experimental Zoology Part A Ecological and Integrative Physiology,
Год журнала:
2020,
Номер
335(1), С. 158 - 172
Опубликована: Дек. 2, 2020
Abstract
One
principle
threat
prompting
the
worldwide
decline
of
amphibians
is
introduction
nonindigenous
amphibians.
The
African
Clawed
Frog,
Xenopus
laevis
,
now
one
widest
distributed
occurring
on
four
continents
with
ongoing
range
expansion
including
large
parts
Europe.
Species
distribution
models
(SDMs)
are
essential
tools
to
predict
invasive
risk
these
species.
Previous
efforts
have
focused
correlative
approaches
but
can
be
vulnerable
extrapolation
errors
when
projecting
species'
distributions
in
nonnative
ranges.
Recent
developments
emphasise
more
robust
process‐based
models,
which
use
physiological
data
like
critical
thermal
limits
and
performance,
or
hybrid
using
both
approaches.
SDMs
different
patterns
potential
future
X.
Europe,
it
likely
that
do
not
assess
its
full
potential.
Based
performance
trials,
we
calculate
size
temperature‐dependent
response
surfaces,
scaled
geographic
layers
matching
limits.
We
then
ecophysiological
a
standard
SDM
framework
southern
Africa
Physiological
traits
(standard
metabolic
rate
endurance
time
adult
frogs)
main
drivers
for
predicted
distribution,
while
locomotor
(maximum
velocity
distance
moved
200
ms)
adults
tadpoles
low
contributions.
African Journal of Ecology,
Год журнала:
2022,
Номер
60(3), С. 456 - 466
Опубликована: Март 30, 2022
Abstract
The
sale
of
live
non‐native
animals
has
become
a
social
norm
and
is
global
concern.
pet
trade
industry
one
the
main
pathways
where
small
mammals
are
introduced
worldwide.
We
conducted
questionnaire
survey
in
South
African
shops
from
September
2018
to
2019
gain
insights
into
mammalian
species
Africa.
also
investigated
whether
shop
owners
were
aware
National
Environmental
Management:
Biodiversity
Act
(NEM:
BA;
No.
10
2004),
which
regulates
provides
management
conservation
country's
biodiversity.
A
total
111
owners/managers
responded
survey,
with
26.6%
reporting
birds,
25.1%
fish
22.5%
mammals.
16
reported
sold,
European
rabbits
(
Oryctolagus
cuniculus
),
Norwegian
rats
Rattus
norvegicus
)
house
mice
Mus
musculus
being
most
commonly
sold
pets.
found
that
breeders,
animal
rescues
major
suppliers
mammal
pets,
terms
regulation,
respondents
(67.8%)
NEM:
BA.
However,
despite
knowledge
regulations,
some
traded
pose
serious
invasion
threat.
As
result,
we
recommend
increased
monitoring
public
awareness
prevent
potential
negative
impacts
associated
