Annual Variation of Survival Advantage of Large Juvenile Side-Blotched Lizards, Uta stansburiana: Its Causes and Evolutionary Significance

Ferguson, Gary W.; Fox, Stanley F.

doi:10.2307/2408492

Cited by 133 publications

(103 citation statements)

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“…In our study no such e¡ect was detected (table 1), whereas other studies suggest that the putative advantages of larger o¡spring size apply only in some places (e.g. Sinervo & Huey 1990) at some times (Ferguson & Fox 1984;Laurie & Brown 1990;Sinervo et al 1992;Sinervo & Doughty 1996).…”

Section: Discussioncontrasting

confidence: 85%

“…Fox 1975;Ferguson et al 1982;Ferguson & Fox 1984;Olsson 1992;Janzen 1993). In our study no such e¡ect was detected (table 1), whereas other studies suggest that the putative advantages of larger o¡spring size apply only in some places (e.g.…”

Section: Discussionmentioning

confidence: 98%

“…Reptiles have been the study organisms for a number of these studies (e.g. Fox 1975;Ferguson et al 1982;Ferguson & Fox 1984;Volkl 1989;Jayne & Bennett 1990;Laurie & Brown 1990;Brodie 1992;Janzen 1993;Sinervo & Huey 1990;Sinervo et al 1992;Sinervo & Doughty 1996;Olsson et al 1996). In combination, these studies suggest that phenotypic traits such as hatchling size, colour and locomotor performance can in£uence survival rates of free-living reptiles.…”

Section: Introductionmentioning

confidence: 99%

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Quantity or quality? Determinants of maternal reproductive success in tropical pythons (Liasis fuscus)

Madsen

Shine

1998

Proc. R. Soc. Lond. B

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A female's reproductive output (size and number of o¡spring) may say little about her reproductive success; the`quality' of her progeny and the time that they are produced may be more important in this respect. We marked and released 1224 hatchling water pythons (Liasis fuscus) from 116 clutches of laboratory-incubated eggs, in a study site in tropical Australia. Clutches varied widely in the number of eggs, mean o¡spring sizes, the proportion of eggs that hatched, and recapture rates of o¡spring. Clutch size was not signi¢cantly correlated with the number of recaptured hatchlings in either year, nor was mean o¡spring size related to recapture probability. Instead, o¡spring recapture rates varied as a function of the time of hatching. Recapture rates were higher for hatchlings released in a year with high prey availability than in a year with few prey. In addition, recapture rates were higher for earlier-hatching clutches in the year with few prey. The other signi¢cant e¡ect on recapture rates involved o¡spring viability: some clutches had a much higher proportion of surviving o¡spring than did others, and recapture rates were higher from clutches with higher hatching success (i.e. proportion of eggs hatching). Hence, the usual measures of reproductive output (clutch size and o¡spring size) o¡er only a poor index of a female's reproductive success in this system.

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Section: Discussioncontrasting

confidence: 85%

Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Quantity or quality? Determinants of maternal reproductive success in tropical pythons (Liasis fuscus)

Madsen

Shine

1998

Proc. R. Soc. Lond. B

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“…Faster-growing snakes are likely to attain sexual maturity earlier (or at a larger body size) and increase litter or egg size (Ford and Seigel, 1989;Beaupre et al, 1998;Rivas and Burghardt, 2001). Accelerated growth may also increase survival rate by reducing vulnerability to predation (risk of predation in reptiles is size dependent; Ferguson and Fox, 1984;Forsman, 1993;Webb and Whiting, 2005). Consequently, such individuals may rapidly prevail in the colonising population.…”

Section: Discussionmentioning

confidence: 99%

Island colonisation and the evolutionary rates of body size in insular neonate snakes

Aubret

2014

Heredity

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Island colonisation by animal populations is often associated with dramatic shifts in body size. However, little is known about the rates at which these evolutionary shifts occur, under what precise selective pressures and the putative role played by adaptive plasticity on driving such changes. Isolation time played a significant role in the evolution of body size in island Tiger snake populations, where adaptive phenotypic plasticity followed by genetic assimilation fine-tuned neonate body and head size (hence swallowing performance) to prey size. Here I show that in long isolated islands (46000 years old) and mainland populations, neonate body mass and snout-vent length are tightly correlated with the average prey body mass available at each site. Regression line equations were used to calculate body size values to match prey size in four recently isolated populations of Tiger snakes. Rates of evolution in body mass and snout-vent length, calculated for seven island snake populations, were significantly correlated with isolation time. Finally, rates of evolution in body mass per generation were significantly correlated with levels of plasticity in head growth rates. This study shows that body size evolution occurs at a faster pace in recently isolated populations and suggests that the level of adaptive plasticity for swallowing abilities may correlate with rates of body mass evolution. I hypothesise that, in the early stages of colonisation, adaptive plasticity and directional selection may combine and generate accelerated evolution towards an 'optimal' phenotype.

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“…Further, hatchlings of ''dry nest'' appear to be superior to those of the other two groups based on their phenotypic traits. It is believed that in nature larger hatchlings of lizards have greater survival than the smaller ones (Ferguson andFox 1984, Van Damme et al 1992). Larger hatchlings with longer limbs run faster and thus better at escaping from the predators (Losos 1990, Sinervo andLosos 1991).…”

Section: Discussionmentioning

confidence: 99%

Expressão da plasticidade fenotípica em filhotes do lagarto Calotes versicolor (Squamata: Agamidae): influência da umidade do ninho.

Pandav¹,

Saidapur²,

Shanbhag³

2012

Phyllomedusa

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Expression of phenotypic plasticity in hatchlings of the lizard Calotes versicolor (Squamata: Agamidae): influence of nest moisture. Calotes versicolor breed from late May to early October. The breeding activity begins with the onset of the southwest monsoon. The eggs laid in early breeding season experience more wet conditions than those of the late breeding season. We studied the influence of nest moisture levels on the phenotypic traits of hatchlings by burying the eggs in 5-cm-deep sand nests with ~50% (wet nest) or ~20% (relatively dry nest) moisture to simulate nesting conditions of early and late breeding seasons. A group of eggs were subjected to standard laboratory incubation procedure in which eggs are half-buried in the moist sand and the other half exposed to air. Hatching time and hatchling body size varied with the treatment. The eggs from dry nests hatched later and hatchlings were the biggest but possessed least amount of residual yolk compared to those of ''wet nest'' and also ''lab incubated'' groups. In these hatchlings head and limb sizes were significantly larger than that of the other two groups. The findings show: (1) a developmental plasticity in the lizard, (2) that under low moist conditions larger body size is preferred, and (3) that the trade-off between somatic growth of embryos and future energy reserves (residual yolk) of hatchlings is influenced by the soil moisture in C. versicolor. profundidade com ~50% (ninho úmido) ou ~20% (ninho relativamente seco) de umidade para simular as condições de nidificação do início e do final da estação reprodutiva. Um grupo de ovos foi submetido a um procedimento padronizado de incubação laboratorial em que os ovos são semienterrados na areia úmida enquanto a outra metade permanece exposta ao ar. O tempo de eclosão e o tamanho corporal dos filhotes recém-eclodidos variaram com o tratamento. Os ovos dos ninhos secos eclodiram mais tarde e os filhotes foram os maiores, mas possuíam menor quantidade de vitelo residual comparados com os grupos de ''ninhos úmidos'' e também de ''incubação laboratorial''. Nesses filhotes, os tamanhos da cabeça e dos membros foram significativamente maiores do que os dos outros dois grupos. Os resultados mostram: (1) uma plasticidade de desenvolvimento no lagarto, (2) que sob condições de baixa umidade um tamanho corporal maior é preferível e (3) que o compromisso entre o crescimento somático dos embriões e as reservas energéticas futuras (vitelo residual) dos filhotes é influenciado pela umidade do solo em C. versicolor. KeywordsPalavras-chave: fenótipo, filhotes, incubação laboratorial, plasticidade do desenvolvimento, umidade do ninho, vitelo residual.

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Annual Variation of Survival Advantage of Large Juvenile Side-Blotched Lizards, Uta stansburiana: Its Causes and Evolutionary Significance

Cited by 133 publications

References 0 publications

Quantity or quality? Determinants of maternal reproductive success in tropical pythons (Liasis fuscus)

Quantity or quality? Determinants of maternal reproductive success in tropical pythons (Liasis fuscus)

Island colonisation and the evolutionary rates of body size in insular neonate snakes

Expressão da plasticidade fenotípica em filhotes do lagarto Calotes versicolor (Squamata: Agamidae): influência da umidade do ninho.

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