Geomorphological River Characteristics Explain Species Turnover in Amphibians, Reptiles and Lemurs in Madagascar's Eastern Rainforests
Journal of Biogeography,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 19, 2025
ABSTRACT
Aim
The
riverine
barrier
hypothesis
is
often
tested
as
a
driver
for
allopatric
speciation.
Rivers
are
usually
treated
static
landscape
features
characterised
by
their
width
and
elevation
of
headwaters.
We
aim
to
investigate
the
role
rivers
barriers
using
comprehensive
database
geomorphological
characteristics
assessing
influence
on
species
turnover
rates.
Location
Eastern
Madagascar.
Taxon
Sixty‐two
taxa
from
11
genera
lemurs,
amphibians
reptiles.
Methods
compiled
21
variables
45
major
rivers,
estimated
rates
assemblages
either
side
modelled
river
diversity.
Topographic
depressions,
identified
longitudinal
profiles,
heterogeneity
were
further
analysed
potential
palaeoclimatic
refugia
alternative
speciation
drivers.
Results
A
total
24
acted
barriers.
Three
these
had
disproportionately
high
shared
set
distinct
like
maximum
watershed,
flow
accumulation
values
at
outlet
an
800
m
concavity
profile.
Other
along
main
channel
length
coastal
plain
helped
differentiate
between
with
intermediate
Species
richness
peaked
in
northeastern
Madagascar,
region
highest
abundance
topographic
depressions
inferred
palaeo‐wetlands.
Main
Conclusions
Geomorphological
effectively
explained
variations
However,
it
remains
uncertain
whether
functioned
secondary
dispersal
thereby
maintainers
diversity,
rather
than
primary
drivers
Additionally,
we
emphasise
during
oscillations,
which
associated
depressions.
Overall,
integrating
dynamic
fluvial
systems
through
space
time
into
biogeographic
studies
offers
valuable
insights
speciation,
persistence
taxa.
Язык: Английский
A review of the species groups of the Western Hemisphere Onthophagus Latreille (Coleoptera: Scarabaeidae: Scarabaeinae) using COI barcoding and gene trees
Zootaxa,
Год журнала:
2025,
Номер
5604(4), С. 401 - 447
Опубликована: Март 16, 2025
Species
groups
of
Western
Hemispheric
Onthophagus
Latreille
(Coleoptera:
Scarabaeidae:
Scarabaeinae:
Onthophagini)
are
suggested
using
COI
barcoding
and
gene
trees
supported
by
congruence
with
external
morphology,
behavior,
ecology,
biogeographic
evidence.
New
species
groups,
complexes,
taxonomic
statuses
offered,
other
preexisting
proposals
confirmed.
No
gap
w
as
found
between
the
intragroup
intergroup
genetic
distance
blocks,
but
average
(8.38%)
(13.88%)
Kimura-two-parameter
distances
statistically
different.
The
following
seven
were
mtDNA
barcode
analysis
independent
evidence:
O.
chevrolati,
clypeatus,
dicranius,
gazellinus,
hircus,
landolti,
mexicanus.
Eight
new
suggested:
crinitus,
curvicornis,
eulophus,
hecate,
hoepfneri,
marginatus,
nasutus,
velutinus.
Possible
behavioral/ecological
adaptations
morphological
characters
also
discussed.
evolutionary
hypotheses
advanced.
An
identification
key
for
is
presented.
Язык: Английский