Sex, Reproductive Status, and Cost of Tail Autotomy via Decreased Running Speed in Lizards

Autotomy, voluntary shedding of body parts to permit escape, is a theoretically interesting defense because escape benefit is offset by numerous costs, including impaired future escape ability. Reduced sprint speed is a major escape cost in some lizards. We predicted that tail loss causes decreased...

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Published inEthology Vol. 115; no. 1; pp. 7 - 13
Main Authors Cooper Jr, William E, Wilson, Dawn S, Smith, Geoffrey R
Format Journal Article
LanguageEnglish
Published Oxford, UK Oxford, UK : Blackwell Publishing Ltd 2009
Blackwell Publishing Ltd
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Online AccessGet full text
ISSN0179-1613
1439-0310
DOI10.1111/j.1439-0310.2008.01575.x

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Abstract Autotomy, voluntary shedding of body parts to permit escape, is a theoretically interesting defense because escape benefit is offset by numerous costs, including impaired future escape ability. Reduced sprint speed is a major escape cost in some lizards. We predicted that tail loss causes decreased speed in males and previtellogenic females, but not vitellogenic females already slowed by mass gain. In the striped plateau lizard, Sceloporus virgatus, adults of both sexes are subject to autotomy, and females undergo large increases in body condition (mass/length) during vitellogenesis. Time required for running 1 m was similar in intact autotomized males and previtellogenic females, but increased by nearly half after autotomy. Vitellogenic females were slower than other lizards when intact, but their speed was unaffected by autotomy. Following autotomy, speeds of all groups were similar. Thus, speed costs of autotomy vary with sex and reproductive condition: decreased running speed is not a cost of autotomy in vitellogenic females or presumably gravid females. Costs of autotomy are more complex than previously known. Speed and other costs might interact in unforseen ways, making it difficult to predict whether strategies to compensate for diminished escape ability differ with reproductive condition in females.
AbstractList Autotomy, voluntary shedding of body parts to permit escape, is a theoretically interesting defense because escape benefit is offset by numerous costs, including impaired future escape ability. Reduced sprint speed is a major escape cost in some lizards. We predicted that tail loss causes decreased speed in males and previtellogenic females, but not vitellogenic females already slowed by mass gain. In the striped plateau lizard, Sceloporus virgatus , adults of both sexes are subject to autotomy, and females undergo large increases in body condition (mass/length) during vitellogenesis. Time required for running 1 m was similar in intact autotomized males and previtellogenic females, but increased by nearly half after autotomy. Vitellogenic females were slower than other lizards when intact, but their speed was unaffected by autotomy. Following autotomy, speeds of all groups were similar. Thus, speed costs of autotomy vary with sex and reproductive condition: decreased running speed is not a cost of autotomy in vitellogenic females or presumably gravid females. Costs of autotomy are more complex than previously known. Speed and other costs might interact in unforseen ways, making it difficult to predict whether strategies to compensate for diminished escape ability differ with reproductive condition in females.
Autotomy, voluntary shedding of body parts to permit escape, is a theoretically interesting defense because escape benefit is offset by numerous costs, including impaired future escape ability. Reduced sprint speed is a major escape cost in some lizards. We predicted that tail loss causes decreased speed in males and previtellogenic females, but not vitellogenic females already slowed by mass gain. In the striped plateau lizard, Sceloporus virgatus, adults of both sexes are subject to autotomy, and females undergo large increases in body condition (mass/length) during vitellogenesis. Time required for running 1 m was similar in intact autotomized males and previtellogenic females, but increased by nearly half after autotomy. Vitellogenic females were slower than other lizards when intact, but their speed was unaffected by autotomy. Following autotomy, speeds of all groups were similar. Thus, speed costs of autotomy vary with sex and reproductive condition: decreased running speed is not a cost of autotomy in vitellogenic females or presumably gravid females. Costs of autotomy are more complex than previously known. Speed and other costs might interact in unforseen ways, making it difficult to predict whether strategies to compensate for diminished escape ability differ with reproductive condition in females.
Autotomy, voluntary shedding of body parts to permit escape, is a theoretically interesting defense because escape benefit is offset by numerous costs, including impaired future escape ability. Reduced sprint speed is a major escape cost in some lizards. We predicted that tail loss causes decreased speed in males and previtellogenic females, but not vitellogenic females already slowed by mass gain. In the striped plateau lizard, Sceloporus virgatus, adults of both sexes are subject to autotomy, and females undergo large increases in body condition (mass/length) during vitellogenesis. Time required for running 1 m was similar in intact autotomized males and previtellogenic females, but increased by nearly half after autotomy. Vitellogenic females were slower than other lizards when intact, but their speed was unaffected by autotomy. Following autotomy, speeds of all groups were similar. Thus, speed costs of autotomy vary with sex and reproductive condition: decreased running speed is not a cost of autotomy in vitellogenic females or presumably gravid females. Costs of autotomy are more complex than previously known. Speed and other costs might interact in unforseen ways, making it difficult to predict whether strategies to compensate for diminished escape ability differ with reproductive condition in females. [PUBLICATION ABSTRACT]
AbstractAutotomy, voluntary shedding of body parts to permit escape, is a theoretically interesting defense because escape benefit is offset by numerous costs, including impaired future escape ability. Reduced sprint speed is a major escape cost in some lizards. We predicted that tail loss causes decreased speed in males and previtellogenic females, but not vitellogenic females already slowed by mass gain. In the striped plateau lizard, Sceloporus virgatus, adults of both sexes are subject to autotomy, and females undergo large increases in body condition (mass/length) during vitellogenesis. Time required for running 1m was similar in intact autotomized males and previtellogenic females, but increased by nearly half after autotomy. Vitellogenic females were slower than other lizards when intact, but their speed was unaffected by autotomy. Following autotomy, speeds of all groups were similar. Thus, speed costs of autotomy vary with sex and reproductive condition: decreased running speed is not a cost of autotomy in vitellogenic females or presumably gravid females. Costs of autotomy are more complex than previously known. Speed and other costs might interact in unforseen ways, making it difficult to predict whether strategies to compensate for diminished escape ability differ with reproductive condition in females.
Author Wilson, Dawn S.
Smith, Geoffrey R.
Cooper Jr, William E.
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References_xml – reference: Vitt, L. J., Congdon, J. D. & Dickson, N. A. 1977: Adaptive strategies and energetics of tail autotomy in lizards. Ecology 58, 326-337.
– reference: Caro, T. M. 2005: Antipredator Defenses in Birds and Mammals. Univ. of Chicago Press, Chicago.
– reference: Vitt, L. J. & Price, H. J. 1982: Ecological and evolutionary determinants of relative clutch mass in lizards. Herpetologica 38, 237-255.
– reference: Cooper, W. E. Jr & Wilson, D. S. 2008: How to stay alive after losing your tail. Behaviour 145, 552-555.
– reference: Daniels, C. B. 1984: The importance of caudal lipid in the gecko Phyllodactylus marmoratus. Herpetologica 40, 337-344.
– reference: Fox, S. F. & Rostker, M. A. 1982: Social cost of tail loss in Uta stansburiana. Science 218, 692-693.
– reference: Bauwens, D. & Thoen, C. 1981: Escape tactics and vulnerability to predation associated with reproduction in the lizard Lacerta vivipara. J. Anim. Ecol. 50, 733-743.
– reference: Vinegar, M. B. 1975: Demography of the striped plateau lizard, Sceloporus virgatus. Ecology 56, 172-182.
– reference: Daniels, C. B. 1983: Running: an escape strategy enhanced by autotomy. Herpetologica 39, 162-165.
– reference: Formanowicz, D. R. Jr, Brodie, E. D. Jr & Bradley, P. J. 1990: Behavioral compensation for tail loss in the ground skink, Scincella lateralis. Anim. Behav. 40, 782-784.
– reference: Cooper, W. E. Jr 2007: Compensatory changes in escape and refuge use following autotomy in the lizard Sceloporus virgatus. Can. J. Zool. 85, 99-107.
– reference: Punzo, F. 1982: Tail autotomy and running speed in the lizards Cophosaurus texanus and Uma notata. J. Herpetol. 16, 329-331.
– reference: Cooper, W. E. Jr, Vitt, L. J., Caldwell, J. P. & Fox, S. F. 2001: Foraging modes of some American lizards: relationships among measurement variables and discreteness of modes. Herpetologica 57, 65-76.
– reference: Schwarzkopf, L. & Shine, R. 1992: Costs of reproduction in lizards: escape tactics and susceptibility to predation. Behav. Ecol. Sociobiol. 31, 17-25.
– reference: Downes, S. & Shine, R. 2001: Why does tail loss increase a lizard's later vulnerability to snake predators? Ecology 82, 1293-1303.
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Snippet Autotomy, voluntary shedding of body parts to permit escape, is a theoretically interesting defense because escape benefit is offset by numerous costs,...
AbstractAutotomy, voluntary shedding of body parts to permit escape, is a theoretically interesting defense because escape benefit is offset by numerous costs,...
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SubjectTerms adults
Animal behavior
body condition
Females
gravid females
Lacertilia
Lizards
males
Reptiles & amphibians
Sceloporus
Sceloporus virgatus
Survival analysis
tail
Theory
Title Sex, Reproductive Status, and Cost of Tail Autotomy via Decreased Running Speed in Lizards
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