10.5061/DRYAD.TK5PH
Paterson, John T.
Montana State University
Rotella, Jay J.
Montana State University
Mannas, Jennifer M.
Montana State University
Garrott, Robert A.
Montana State University
Data from: Patterns of age-related change in reproductive effort differ in
the pre-natal and post-natal periods in a long-lived mammal
Dryad
dataset
2017
reproductive allocation
Leptonychotes weddellii
Weddell seal
terminal allocation
Holocene
2017-07-19T00:00:00Z
2017-07-19T00:00:00Z
en
https://doi.org/10.1111/1365-2656.12577
103483 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Age-related changes in maternal reproductive allocation for long-lived
species are a key prediction from life-history theory. Theoretical and
empirical work suggests that allocation may increase with age due to
constraint (increases with experience) or restraint (increases with age in
the face of declining residual reproductive value), and may decrease among
the oldest aged animals due to senescence in reproductive function. Here,
we use a hierarchical modelling approach to investigate the age-related
patterns of change in maternal reproductive effort in the Weddell seal, a
long-lived marine mammal with a protracted period of maternal care during
which mothers allocate a large proportion of body mass while feeding
little. We find that maternal allocation increases with age for young
mothers during both the pre-natal and post-natal periods. In contrast,
older mothers demonstrate a senescent decline in pre-natal allocation but
allocate more of their declining resources to their offspring during the
post-natal period. We also find strong evidence for the importance of
individual effects in reproductive allocation among mothers: some mothers
consistently produce heavier (or lighter) pups than expected. Our results
indicate that maternal allocation changes over a mother's
reproductive life span and that age-specific differences differ in notable
ways in pre-natal and post-natal periods.
Data for maternal masses near parturition.This file contains the data used
for models of maternal mass near parturition and contains the following
columns: Mass (kg), momAGE.c (maternal ages in years at weighing, centered
using the mean), momAGE.c.sq (the square of the previous term), momAGE.log
(the log transform of maternal age in years, made by subtracting the
minimum age from each animal and adding a small constant), PrevState
(breeding state the previous season), NPrevPup.c (the number of previous
pups for each mother, scaled by the average number of pups at each age),
Season (year of measurement).mommasses_publication.csvData for pup masses
near parturition, and daily gains during early and late lactationThis file
contains the data used for models of pup mass near parturition and
contains the following columns: PartMass (kg), momAGE.c (maternal ages in
years at weighing, centered using the mean), MidGain (kg/day for the first
20 days), LateGain (kg/day for days 20 to 35), Season (year of
measurement), DTA (deviation from target age), Female (indicator variable
for female), Btime.c (birthdate centered using the mean), Btime.c.sq
(square of the previous term), momSPENO (unique identifier for mother),
momAGE.c.sq (the square of the previous term), momAGE.log (the log
transform of maternal age in years, made by subtracting the minimum age
from each animal and adding a small constant), NPrevPup.c (the number of
previous pups for each mother, scaled by the average number of pups at
each age), PrevState (breeding state the previous season), PartMass.c
(parturition mass centered according to the
mean).pupmasses_publication.csv
Ross Sea
Antarctica