Phylogenetic analysis of viviparity, matrotrophy, and other reproductive patterns in chondrichthyan fishes
Biological reviews/Biological reviews of the Cambridge Philosophical Society,
Journal Year:
2024,
Volume and Issue:
99(4), P. 1314 - 1356
Published: April 1, 2024
ABSTRACT
The
reproductive
diversity
of
extant
cartilaginous
fishes
(class
Chondrichthyes)
is
extraordinarily
broad,
reflecting
more
than
400
million
years
evolutionary
history.
Among
their
many
notable
specialisations
are
viviparity
(live‐bearing
reproduction)
and
matrotrophy
(maternal
provision
nutrients
during
gestation).
However,
attempts
to
understand
the
evolution
these
traits
have
yielded
highly
discrepant
conclusions.
Here,
we
compile
analyse
current
knowledge
on
in
Chondrichthyes
with
particular
foci
frequency,
phylogenetic
distribution,
directionality
changes
modes
reproduction.
To
characterise
transformations,
amassed
largest
empirical
data
set
parameters
date
covering
nearly
800
species
analysed
it
via
a
comprehensive
molecular‐based
phylogeny.
Our
reconstructions
indicated
that
ancestral
pattern
for
‘short
single
oviparity’
(as
found
holocephalans)
which
females
lay
successive
clutches
(broods)
one
or
two
eggs.
Viviparity
has
originated
at
least
12
times,
10
origins
among
sharks,
batoids,
(based
published
evidence)
another
potential
origin
fossil
holocephalan.
Substantial
evolved
six
including
placentotrophy,
three
separate
oophagy
(egg
ingestion),
histotrophy
(uptake
uterine
secretions).
In
clades,
placentation
was
replaced
by
histotrophy.
Unlike
past
reconstructions,
our
analysis
reveals
no
evidence
ever
reverted
oviparity
this
group.
Both
arisen
variety
sequences.
addition,
given
rise
distinct
egg‐laying
patterns
increased
clutch
(brood)
size
and/or
involved
deposition
eggs
advanced
stages
development.
Geologically,
oviparous
arose
Paleozoic.
Most
Mesozoic,
while
few
represented
low
taxonomic
levels
Cenozoic
origin.
Coupled
other
recent
work,
review
points
way
towards
an
emerging
consensus
chondrichthyans
offering
basis
future
functional
analyses.
This
also
contributes
conservation
efforts
highlighting
taxa
whose
reflect
distinctive
trajectories
deserve
special
protection
further
investigation.
Language: Английский
Global habitat predictions to inform spatiotemporal fisheries management: Initial steps within the framework
Marine Policy,
Journal Year:
2024,
Volume and Issue:
164, P. 106155 - 106155
Published: April 29, 2024
Tuna
Regional
Fishery
Management
Organizations
(tRFMOs)
are
increasingly
interested
in
spatiotemporal
management
as
a
tool
to
reduce
interaction
rates
with
vulnerable
species.We
use
blue
shark
(Prionace
glauca)
case
study
demonstrate
the
critical
first
steps
implementation
process,
highlighting
how
predictions
of
global
habitat
for
life
stages
can
be
transformed
into
publicly-accessible
spatial
bycatch
mitigation
tool.By
providing
examples
possible
goals
and
an
associated
threshold
identify
essential
habitats,
we
show
these
key
areas
represent
relatively
low
percentage
oceanic
area
on
monthly
basis
(16-24%
between
50
•
S
60
N),
yet
have
high
potential
protection
efficiency
(~
42%)
if
fishing
effort
is
redistributed
elsewhere.While
has
demonstrable
sharks
effectively
mitigate
mortality
sensitive
stages,
inherent
challenges
sequential
that
require
careful
consideration
by
tRFMOs
work
proceeds.We
also
discuss
our
single-species
framework
could
easily
extended
multispecies
approach
assigning
relative
conservation
risk
before
layering
model
integrated
analysis.Such
broader
application
address
related
reducing
ecosystem
effects
pave
way
efficient
fisheries
co-management
using
ecosystem-based
approach.
Language: Английский
Blue shark (Prionace glauca) movements, habitat use, and vertical overlap with longline fishing gears in the southwestern Atlantic Ocean
Marine Biology,
Journal Year:
2024,
Volume and Issue:
171(5)
Published: March 28, 2024
Language: Английский
Size structure, age, and growth of the blue shark, Prionace glauca (Linnaeus, 1758) in southern Brazil
Journal of Fish Biology,
Journal Year:
2024,
Volume and Issue:
105(1), P. 46 - 58
Published: April 15, 2024
Abstract
The
blue
shark
is
a
highly
migratory
species
with
worldwide
distribution,
making
it
susceptible
to
multiple
fishing
fleets
across
the
globe.
In
southern
Brazil,
an
important
target,
comprising
up
40%
of
total
biomass
landed
by
commercial
surface
longline
fleet.
This
study
aims
contribute
better
understanding
how
uses
region
and
update
its
life‐history
information
available
for
future
assessments.
Over
five
consecutive
years
(2018–2022)
landings
onboard
monitoring,
we
gathered
size
data
vertebral
samples
describe
composition
in
region,
as
well
seasonal
interannual
variability
estimated
parameters.
results
showed
that
Brazil
mainly
inhabited
large
juvenile
males
arrive
during
winter
(July–September)
stay
until
spring
(October–December),
when
their
frequency
decreases.
Small
adult
are
present
throughout
year
but
higher
frequencies
summer.
A
small
number
females
summer,
which
decreases
austral
autumn
winter.
Some
presence
each
life
stage
was
observed
among
years.
parameters
were
follows:
L
∞:
255.02
cm
fork
length
(FL),
k
:
0.20,
0
:35.68
FL
males;
246.47
FL,
0.23,
:36.77
females;
269.58
0.18,
:36.19
pooled
sexes.
However,
values
must
be
cautiously
interpreted,
obtained
cannot
construed
representative
entire
harvested
stock
due
lack
consistent
some
stages
region.
Language: Английский