Ecological speciation with gene flow followed initial large‐scale geographic speciation in the enigmatic afroalpine giant senecios (Dendrosenecio)
New Phytologist,
Journal Year:
2025,
Volume and Issue:
246(5), P. 2307 - 2323
Published: Feb. 1, 2025
Summary
Mountains
have
highly
heterogeneous
environments
that
generate
ample
opportunities
for
lineage
differentiation
through
ecological
adaptation,
geographic
isolation
and
secondary
contact.
The
of
the
afroalpine
vegetation
fragments
on
East
African
mountain
tops
makes
them
an
excellent
system
to
study
speciation.
initial
diversification
within
endemic
genus
Dendrosenecio
was
shown
occur
via
allopatric
divergence
among
four
isolated
groups,
but
potential
role
speciation
these
groups
gene
flow
in
remained
uncertain.
Here
we
extend
sampling
use
phylogenomics
assess
importance
genus.
Then,
population
genomics,
demographic
modelling
habitat
analyses
are
used
two
sister
species
occurring
Mount
Kenya.
We
found
sympatric
Mt
Kenya
occupy
distinct
microhabitats,
our
support
they
originated
situ
with
flow.
In
addition,
obtained
signals
admixture
history
between
groups.
Taken
together,
results
suggest
shaped
main
lineages,
while
ecologically
mediated
occurred
a
single
mountain.
Language: Английский
Mountain Bogs of Costa Rica
Published: Jan. 17, 2025
High-altitude
mountain
bogs,
located
in
the
Central
and
Talamanca
Mountain
Ranges
of
Costa
Rica
(1200–3100
m
a.s.l.),
remain
one
least
explored
inland
aquatic
ecosystems
potentially
most
geographically
restricted.
These
unique
wetlands
are
confined
to
topographic
depressions
with
limited
drainage,
rely
solely
on
rainfall
for
maintenance
their
water
bodies,
can
dry
up
entirely
during
prolonged
spells.
Since
they
specific
soil
conditions
maintain
a
characteristic
biota
many
endemic
species,
bogs
deserve
urgent
conservation
attention.
Unfortunately,
human
activities
have
significantly
impacted
these
fragile
(e.g.
drainage
agricultural
purposes,
illicit
extraction
plant
fragmentation,
pollution,
fire).
Concentrated
predominantly
Talamanca,
represent
discrete
biomes
embedded
within
oak
forests
páramos,
reflecting
complex
interplay
between
parent
material,
topography,
climatic
factors.
Here,
we
discuss
ecological
traits,
biogeographic
significance,
limnological
characteristics,
representative
organisms,
climate
change
vulnerability
propose
key
research
areas
enhance
management
this
ecosystem.
We
compiled
list
108
vascular
species
(27%
endemics),
analyzed
bird
composition,
listed
amphibians
reptiles,
particularly
Bolitoglossa
salamanders.
present
preliminary
expected
mammals
(57
18
endemics,
3
bat
genera).
Aquatic
insects
crustaceans
just
beginning
be
explored,
but
several
new
reports
were
reported.
diverse
characterized
by
high
levels
endemism.
They
important
carbon
reservoirs
serve
as
comprehensive
paleobotanical
pollen
record
showing
fluctuations
location
tree
line
extension
páramos
geologic
past.
Climate
may
cause
significant
turnover
elevational
shifts
due
decreasing
increasing
temperatures,
further
compounded
risk
biological
invasions
habitat
loss
mediated
such
road
construction
powerline
installation.
Urgent
scientific
strategies
imperative
safeguard
endangered
bog
ecosystem,
ensuring
its
continued
existence
resilience
amidst
escalating
environmental
pressures
anthropogenic
disturbances.
Language: Английский
Global variability in LGM cooling amongst paleoclimate datasets affects biome reconstructions in mountains
Frontiers of Biogeography,
Journal Year:
2025,
Volume and Issue:
18
Published: May 29, 2025
Downscaled
paleoclimate
datasets
are
widely
used
in
biogeographical
research,
aiding
our
understanding
of
past
environmental
shifts
and
species’
responses
to
climate
change.
Numerous
exist,
varying
spatiotemporal
resolution
underlying
methodologies,
resulting
variation
estimated
temperature.
Understanding
this
variability
is
important
for
accurately
reconstructing
dynamics,
especially
complex
regions
like
mountains.
We
compare
the
Mean
Annual
Temperature
(MAT)
at
Last
Glacial
Maximum
(LGM)
from
five
different
downscaled
—
Beyer,
CHELSA-TraCE21k,
EcoClimate,
PALEO-PGEM-series,
WorldClim
against
MAT
estimates
paleoenvironmental
proxy
records
(fossil
pollen
plant
macrofossils)
within
outside
Additionally,
we
test
performance
a
‘global
grid
cooling’
method
(i.e.
lowering
local
temperatures
by
global
LGM
estimate)
records.
Then,
evaluate
implications
inter-dataset
temperature-delimited
biomes
mountains
treeline
elevations.
find
that
temperature
cooling
reconstructions
strongly
vary
amongst
between
The
gradient
with
elevation
poorly
captured
coarser
spatial
resolution.
Paleoclimate
generally
suggest
warmer
than
records,
mountains,
while
more
closely
aligns
Inter-dataset
can
affect
outcome
their
boundaries,
such
as
treelines.
call
greater
awareness
transparency
about
limitations
mountainous
areas
further
research
be
aimed
capturing
small-scale
heterogeneity
paleotemperature
datasets.
globally
both
over-
underestimated
datasets,
overestimation
too
high)
underestimation
low)
Differences
range
288
2779
metres,
depending
on
dataset.
several
unsuitable
capture
regions.
median
difference
larger
mountain
ranges,
substantial
differences
dataset
choice
impacts
hypotheses,
conclusions
should
carefully
evaluated.
Language: Английский
Past, present, and future of mountain and island systems
Journal of Systematics and Evolution,
Journal Year:
2024,
Volume and Issue:
62(2), P. 195 - 200
Published: March 1, 2024
Language: Английский
Hybrids as mirrors of the past: genomic footprints reveal spatio-temporal dynamics and extinction risk of alpine extremophytes in the mountains of Central Asia
Frontiers in Plant Science,
Journal Year:
2024,
Volume and Issue:
15
Published: April 17, 2024
Hybridization
is
one
of
the
key
processes
shaping
lineage
diversification,
particularly
in
regions
that
experienced
strong
climate
oscillations.
The
alpine
biome
with
its
rich
history
glacial-interglacial
cycles
and
complex
patterns
species
distribution
shifts
offers
an
excellent
system
to
investigate
impact
gene
flow
on
population
dynamics
speciation,
important
issues
for
evolutionary
biology
biodiversity
conservation.
In
this
study,
we
combined
genomic
data
(DArTseq),
chloroplast
markers,
morphology
examine
phylogenetic
relationships
permeability
boundaries
their
outcomes
among
extremophilic
Puccinellia
(Poaceae)
Pamir
Mountains,
a
part
Mountains
Central
Asia
hotspot.
We
determined
occurrence
interspecific
hybrids
between
P.
himalaica
pamirica,
which
demonstrated
almost
symmetric
ancestry
from
parental
did
not
show
signals
introgression.
According
our
integrative
revision,
natural
pamirica
should
be
classified
as
×vachanica
(pro
species).
Using
approximate
Bayesian
computation
inference,
uncovered
hybridized
independently
multiple
localities
over
Holocene.
Hybrids
inherited
fine-scale
genetic
structure
species,
developed
these
earlier,
during
Late
Pleistocene.
had
different
consequences
involved
lineages,
likely
playing
role
continuing
decline
Our
results
considered
critically
endangered
could
also
retreating
across
entire
range
High
Mountain
Asia.
comparative
phylogeographic
framework,
revealed
risk
extinction
cold-adapted
global
This
study
highlights
genomics
unravel
diversity
trends
under
change
provides
valuable
evidence
conservation
management.
Language: Английский
Different resource partitioning explains plant species richness patterns in tropical alpine ecosystems
bioRxiv (Cold Spring Harbor Laboratory),
Journal Year:
2024,
Volume and Issue:
unknown
Published: June 27, 2024
Abstract
Species
co-existence
based
on
resource
partitioning
modulates
biodiversity
patterns
across
latitudes
and
altitudes.
Resource
can
occur
via
specialisation
or
separation
in
the
geographic
range
niche.
Here,
we
compare
two
tropical
alpine
ecosystems
with
similar
climates
to
test
for
climatic
niche
strategies
explaining
species
richness
difference.
We
species-rich
ecosystem
South
American
Andes
more
species-poor
one
eastern
African
mountains.
combine
phylogenomic
data
three
locally
diversified
plant
lineages
each
region
occurrence
records
estimate
metrics
(size
overlap).
found
that
Andean
have
overall
larger
niches
than
species,
thus
smaller
indicating
is
not
explanation
higher
Andes.
Instead,
overlapping
ranges,
tend
show
less
overlap
effective
separation.
Taken
together,
propose
different
degrees
of
geographically
hence,
a
pattern
partitioning,
explain
differences
between
ecosystems.
Language: Английский