Geographic Differences of Growth Rate of Sceloporus Lizards (Sauria: Iguanidae)

Ferguson, Gary W.; Brockman, Todd

doi:10.2307/1444002

Cited by 52 publications

(35 citation statements)

References 10 publications

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“…in other studies [Ferguson and Brockman, 1980;Sinervo and Adolph, 1989;Ferguson and Talent 1993;Niewiarowski and Roosenburg, 1993]. Therefore, using either crickets or mealworms as prey items provided adequate nutrition for hatchling western fence lizards.…”

Section: Discussionmentioning

confidence: 73%

The effects of prey species on food conversion efficiency and growth of an insectivorous lizard

Rich

Talent

2008

Zoo Biology

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Little is known about the effects of different prey species on lizard growth. We conducted a 6-week study to determine the relative effects of prey species on growth parameters of hatchling western fence lizards, Sceloporus occidentalis. Lizards were fed house cricket nymphs, Acheta domesticus, or mealworm larvae, Tenebrio molitor. The effects of prey species on growth were determined by measuring prey consumption, gross conversion efficiency of food [gain in mass (g)/food consumed (g)], gain in mass, and gain in snout-vent length. Lizards grew well on both the prey species. However, lizards that fed on crickets consumed a significantly higher percentage of their body mass per day than those fed mealworms. Nevertheless, lizards that consumed mealworms ingested significantly more metabolizable energy, had significantly higher food conversion efficiencies, significantly higher daily gains in mass, and significantly greater total growth in mass than lizards that fed on crickets.

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Section: Discussionmentioning

confidence: 73%

The effects of prey species on food conversion efficiency and growth of an insectivorous lizard

Rich

Talent

2008

Zoo Biology

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“…The other variable growth rate model used the relationship between b and a, which is more likely to be a developmental or genetic constraint, with late maturity and high longevity being incompatible with rapid growth. Environmental and genetic in¯uences on growth rate are not exclusive (Ferguson & Brockman, 1980), a situation which is suggested in T. hermanni as the observed size data were bracketed by the two variable growth rate models.…”

Section: Survival Rate and Body Sizementioning

confidence: 92%

Variation in adult survival rate of the tortoise Testudo hermanni in Greece: implications for evolution of body size

Willemsen¹,

Hailey

2001

Journal of Zoology

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Adult annual survival rates estimated by mark±recapture for eight Greek populations of the tortoise Testudo hermanni were in the range 0.80±1.0 (mean 0.886). Estimates from growth rings for the same populations were in a similar range (0.84±0.95, mean 0.899). The average survival rate from the two methods was signi®cantly positively related to mean adult body size (r = 0.815) and negatively related to effective temperature (r = 70.880). A life table model was used to investigate the consequences of adult survival rate for optimum age at maturity and mean adult size of females. The basis of the model was the trade-off between increased reproduction from large adult size, and decreased survival to maturity from delayed age at maturity. The model showed that the observed variation in adult survival rates was more than suf®cient to account for the variation of adult size among populations. The model thus predicted an even greater range of mean adult size than that observed. A negative correlation between growth rate and adult survival rate or age at maturity, as observed, was needed to ®t the size data. The model supports the hypothesis that variation in adult size of T. hermanni in Greece is adaptive (rather than a non-adaptive environmental or phylogenetic effect) and due to variation in adult survival rates (rather than other factors such as juvenile survival).

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“…Different populations of a species may often show considerable differences in growth rates, even from more or less adjacent areas, for reasons that are usually not entirely apparent [27,28]. Food supplementation in nature often increases growth rates [29][30][31][32] and food quality can also be important [33,34]. The dietary requirements of reptiles have not been studied in the same detail as those of some Fishes, however, although this may change with increasing interest in farming crocodilians, marine turtles and iguana liz ards as sources of animal protein in tropical environments.…”

Section: Food and Watermentioning

confidence: 99%

Growth in Reptiles

Avery¹

1994

Gerontology

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This paper reviews the literature on growth in reptiles. The current consensus is that growth data for small and medium-sized reptiles are best fitted by logistic-by-mass equations, data for larger reptiles by the von Bertalanffy equation. Experiments on the relationships between behavioural thermoregulation, food consumption and growth in both the laboratory and field are described, and an account is given of some recent work on individual differences in growth rates and their adaptive significance. In general, it may be said that in almost all areas of biology relating to growth, less is known about reptiles than about equivalent phenomena in fishes.

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Geographic Differences of Growth Rate of Sceloporus Lizards (Sauria: Iguanidae)

Cited by 52 publications

References 10 publications

The effects of prey species on food conversion efficiency and growth of an insectivorous lizard

The effects of prey species on food conversion efficiency and growth of an insectivorous lizard

Variation in adult survival rate of the tortoise Testudo hermanni in Greece: implications for evolution of body size

Growth in Reptiles

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