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.2018 Jun 27;285(1881):20180752.
doi: 10.1098/rspb.2018.0752.

Muscles provide an internal water reserve for reproduction

Affiliations

Muscles provide an internal water reserve for reproduction

George A Brusch 4th et al. Proc Biol Sci..

Abstract

The use of fat to support the energy needs of reproduction (i.e. capital breeding) has been studied in a diversity of taxa. However, despite reproductive output (i.e. young or eggs) being approximately 70% water, little is known about the availability of internal resources to accommodate the hydric demands of reproduction. Recent research suggests that dehydration increases the catabolism of muscle as a means of maintaining water balance. Accordingly, we investigated the interactive effects of reproductive investment and water deprivation on catabolism and reproductive output in female Children's pythons (Antaresia childreni). Both reproductive and non-reproductive females were either provided water ad libitum or were water-deprived for three weeks at the time when reproductive females were gravid. We found that water-deprived reproductive females had, in general, greater body mass loss, epaxial muscle loss, plasma osmolality and plasma uric acid concentrations relative to the other groups. Furthermore, water-deprived females had similar clutch sizes compared with females with access to water, but produced lighter eggs and lower total clutch masses. Our results provide the first evidence that selective protein catabolism can be used to support water demands during reproduction, and, as a result, these findings extend the capital breeding concept to non-energetic resources.

Keywords: bound water; capital breeder; protein catabolism; reproductive costs; water constraints.

© 2018 The Author(s).

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Conflict of interest statement

We have no competing interests.

Figures

Figure 1.
Figure 1.
(a) Average mass change (grams) and (b) average epaxial muscle width change (millimetres) measured in non-reproductive (NR) and reproductive (R) femaleAntaresia childreni with (W) or without (NW) access to water from ovulation to oviposition or its equivalent duration for yoked, non-reproductive females. Error bars represent ±1 s.e.m. Different letters indicate significant differences among groups (HSD post hoc test).
Figure 2.
Figure 2.
Average plasma osmolality change (mOsm kg−1) measured in non-reproductive (NR) and reproductive (R) femaleAntaresia childreni with (W) or without (NW) access to water from ovulation to oviposition or its equivalent duration for yoked, non-reproductive females. Error bars represent ±1 s.e.m. Different letters indicate significant differences among groups (HSD post hoc test).
Figure 3.
Figure 3.
Mean plasma concentrations of (a) total triglycerides, (b) ketones, (c) total protein and (d) uric acid measured during late vitellogenesis and late gravidity in non-reproductive (NR) and reproductive (R) femaleAntaresia childreni with (W) or without (NW) access to water from ovulation to oviposition, or its equivalent duration for yoked, non-reproductive females. Error bars represent ±1 s.e.m. Different letters indicate significant differences among groups (HSD post hoc test).
Figure 4.
Figure 4.
Influence of treatment on clutch mass (grams) measured in reproductive (R) femaleAntaresia childreni with (W) or without (NW) access to water from ovulation to oviposition. Plotted values are LS means adjusted for maternal size (SVL) and relative clutch size (see text for statistics). Error bars represent ±1 s.e.m. Different letters indicate significant differences among groups (HSD post hoc test).
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