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Effects of pregnancy on locomotor performance: an experimental study on lizards

  • Behavioural Ecology
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Abstract

Pregnancy is associated with reduced locomotor performance in many types of animals, but we do not know to what degree this correlation is caused by simple physical burdening, versus physiological changes associated with pregnancy, or to confounding variables (such as season or female body size) that simultaneously influence both reproductive investment and locomotor speeds. To identify causal effects of burden on locomotion, we need to experimentally manipulate the size of the load being carried. Injection of sterile fluid into the peritoneal cavities of 84 garden skinks (Lampropholis guichenoti) showed that speeds decreased with increasing burdens. Lizards with a burden equivalent to 25% of their body mass ran about 15% slower, mirroring the situation seen in gravid lizards of this population. Thus, simple physical burdening appears to be the primary causal component of the locomotor cost of reproduction within these animals. A lizard's sex, body size and shape had little effect on its running ability either before or after treatment, but faster lizards showed a greater performance decrement after burdening than did their slower conspecifics.

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References

  • Atchley WR, Gaskins CT, Anderson D (1976) Statistical properties of ratios. I. Empirical results. Syst Zool 25:137–148

    Google Scholar 

  • Bell G (1980) The costs of reproduction and their consequences. Am Nat 116:45–76

    Article  Google Scholar 

  • Berglund A, Rosenqvist G (1986) Reproductive costs in the prawn Palaemon adspesus: effects on growth and predator vulnerability. Oikos 46:349–354

    Google Scholar 

  • Brodie EDI, Brodie ED Jr (1999) Costs of exploiting poisonous prey: evolutionary trade-offs in a predator-prey arms race. Evolution 53:626–631

    Google Scholar 

  • Bull JJ, Shine R (1979) Iteroparous animals that skip opportunities for reproduction. Am Nat 114:296–316

    Article  Google Scholar 

  • Cogger HG (2000) Reptiles and amphibians of Australia, 6th edn. Reed New Holland, Sydney

  • Cooper WE Jr, Vitt LJ, Hedges R, Huey RB (1990) Locomotor impairment and defense in gravid lizards (Eumeces laticeps): behavioural shift in activity may offset costs of reproduction in an active forager. Behav Ecol Sociobiol 27:153–157

    Google Scholar 

  • Diddle AW (1984) Interrelationship of pregnancy and athletic performance. J Tenn Med Assoc 77:265–269

    CAS  PubMed  Google Scholar 

  • Downes SJ, Shine R (2001) Why does tail loss increase a lizard's later vulnerability to snake predators? Ecology 82:1293–1303

  • Foley N (1998) The mommy track. Women's Sports Fitness 20:48–51

  • Gans C (1974) Biomechanics: an approach to vertebrate biology. Lippincott, Philadelphia

  • Greer AE (1989) The biology and evolution of Australian lizards. Surrey Beatty, Australia

  • Gu H, Danthanarayana W (2000) Variations in life history traits and flight capacity among populations of the light brown apple moth Epiphyas postvittana (Walker) (Lepidoptera: Tortricidae). Aust Ecol 25:571–579

    Article  Google Scholar 

  • Isaacs R, Byrne D (1998) Aerial distribution, flight behaviour and eggload: their inter- relationship during dispersal by the sweet potato whitefly. J Anim Ecol 67:741–750

    Google Scholar 

  • Joss JMP, Minard JA (1985) On the reproductive cycles of Lampropholis guichenoti and L. delicata (Squamata: Scincidae) in the Sydney region. Aust J Zool 33:699–704

    Google Scholar 

  • Lee SJ, Witter MS, Cuthill IC, Goldsmith AR (1996) Reduction in escape performance as a cost of reproduction in gravid starlings, Sturnus vulgaris. Proc R Soc Lond Ser B 263:619–623

    Google Scholar 

  • Magnhagen C (1990) Reproduction under predation risk in the sand goby, Pomatoschistus minutus, and the black goby, Gobius niger: the effect of age and longevity. Behav Ecol Sociobiol 26:331–335

    Google Scholar 

  • Magnhagen C (1991) Predation risk as a cost of reproduction. Trends Ecol Evol 6:183–186

    Google Scholar 

  • McLean J, Speakman J (2000) Morphological changes during postnatal growth and reproduction in the brown long-eared bat Plecotus auritus: implications for wing loading and predicted flight performance. J Nat Hist 34:773–791

    Article  Google Scholar 

  • Miles DB, Sinervo B, Frankino WA (2000) Reproductive burden, locomotor performance, and the cost of reproduction in free ranging lizards. Evolution 54:1386–1395

    CAS  PubMed  Google Scholar 

  • Noordwijk AJ van, de Jong G (1986) Acquisition and allocation of resources: their influence on variation in life-history tactics. Am Nat 128:137–142

    Article  Google Scholar 

  • Olsson M, Shine R, Bak-Olsson E (2000) Locomotor impairment of gravid lizards: is the burden physical or physiological? J Evol Biol 13:263–268

  • Pengilley R (1972) Systematic relationships and ecology of some lygosomine lizards from southeastern Australia. PhD dissertation, Australian National University, Canberra

  • Potteiger JA, Welch JC, Byrne JC (1993) From parturition to marathon: a 16-wk study of an elite runner. Med Sci Sports Exerc 25:673–677

    CAS  PubMed  Google Scholar 

  • Qualls CP, Shine R (1998) Costs of reproduction in conspecific oviparous and viviparous lizards, Lerista bougainvillii. Oikos 82:539–551

  • Qualls FJ (1996) Sources of phenotypic variation in an Australian skink, Lampropholis guichenoti. PhD dissertation, University of Sydney

  • Qualls FJ, Shine R (1997) Geographic variation in "costs of reproduction" in the scincid lizard Lampropholis guichenoti. Funct Ecol 11:757–763

    Google Scholar 

  • Roff DA (1992) The evolution of life histories. Chapman and Hall, New York

  • Schaffer WM (1974) Optimal reproductive effort in fluctuating environments. Am Nat 108:783–900

    Article  Google Scholar 

  • Schwarzkopf L (1996) Decreased food intake in lizards: a fecundity dependent cost of reproduction. Aust J Ecol 21:355–362

    Google Scholar 

  • Schwarzkopf L, Shine R (1992) Costs of reproduction in lizards: escape tactics and vulnerability to predation. Behav Ecol Sociobiol 31:1725

    Google Scholar 

  • Seigel RA, Huggins MM, Ford NB (1987) Reduction in locomotor ability as a cost of reproduction in snakes. Oecologia 73:481–465

    Google Scholar 

  • Shaffer L, Formanowicz D (1996) A cost of viviparity and parental care in scorpions: reduced sprint speed and behavioural compensation. Anim Behav 51:1017–1023

    Article  Google Scholar 

  • Shine R (1980) "Costs" of reproduction in reptiles. Oecologia 46:92–100

    Google Scholar 

  • Shine R (1992) Relative clutch mass and body shape in lizards and snakes: is reproductive investment constrained or optimized? Evolution 46:828–833

  • Sinervo B, DeNardo DF (1996) Costs of reproduction in the wild: path analysis of natural selection and experimental tests of causation. Evolution 50:1299–1313

    Google Scholar 

  • Sinervo B, Hedges R, Adolph SC (1991) Decreased sprint speed as a cost of reproduction in the lizard Sceloporus occidentalis—variation among populations. J Exp Biol 155:323–336

    Google Scholar 

  • Swan G (1990) A field guide to the snakes and lizards of New South Wales. Three Sisters, Winmalee

  • Veasey J, Houston D, Metcalfe N (2000) Flight muscle atrophy and predation risk in breeding birds. Funct Ecol 14:115–121

    Article  Google Scholar 

  • Veasey J, Houston D, Metcalfe N (2001) A hidden cost of reproduction: the trade-off between clutch size and escape take-off speed in female zebra finches. J Anim Ecol 70:20–24

    Article  Google Scholar 

  • Vitt LJ, Congdon JD (1978) Body shape, reproductive effort, and relative clutch mass in lizards: resolution of a paradox. Am Nat 112:595–608

    Article  Google Scholar 

  • Williams GC (1966a) Adaptation and natural selection. Princeton University Press, Princeton, N.J.

  • Williams GC (1966b) Natural selection, the costs of reproduction, and a refinement of Lack's principle. Am Nat 100:687–690

    Article  Google Scholar 

  • Winfield IJ, Townsend CR (1983) The cost of copepod reproduction: increased susceptibility to fish predation. Oecologia 60:406–411

    Google Scholar 

Download references

Acknowledgements

I thank Melanie Elphick and George Barrott-Brown for their enthusiastic and highly skilled assistance in all aspects of this study. The work was funded by the Australian Research Council.

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  1. Biological Sciences A08, University of Sydney, NSW 2006, Australia

    Richard Shine

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  1. Richard Shine
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Correspondence to Richard Shine.

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Shine, R. Effects of pregnancy on locomotor performance: an experimental study on lizards. Oecologia 136, 450–456 (2003). https://doi.org/10.1007/s00442-003-1281-9

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  • DOI: https://doi.org/10.1007/s00442-003-1281-9

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