The Thermal Dependence of Feeding Behaviour, Food Consumption and Gut-Passage Time in the Lizard Lacerta vivipara Jacquin

Damme, Raoul Van; Bauwens, Dirk; Verheyen, R.F.

doi:10.2307/2389633

Cited by 206 publications

(185 citation statements)

References 44 publications

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“…Gut passage time decreased with higher body temperatures (Table 3), as found in other herbivorous reptiles (cf. Windell and Sarokon 1976;Harwood 1979;Waldschmidt et al 1986Waldschmidt et al , 1987Van Damme et al 1991).…”

Section: Digestive Physiologymentioning

confidence: 99%

Ontogenetic changes in food intake and digestion rate of the herbivorous marine iguana (Amblyrhynchus cristatus, Bell)

Wikelski

Gall²,

Trillmich³

1993

Oecologia

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Abstract. Young reptiles have higher relative energy demands than adults, but the proposed ontogenetic changes in diet to fulfil these demands were not found in the algae-eating Galfipagos marine iguanas on Santa F6. Feeding and digestion rates were investigated to analyse how young achieve higher energy intake. Daily food intake of free ranging marine iguana hatchlings (6-11 months old) was about one third that of adults, but relative intake (g dry mass 9 g-1 wet mass 9 day-1) was four times higher in the hatchlings. During feeding experiments, relative daily food intake of hatchling marine iguanas was approximately three times higher than that of adults (0.042 vs 0.013 g dry mass" g-O.8 wet mass" day-1), and mean gut passage time was two times shorter (5 vs 10 days). The hatchlings also maintained high body temperatures (36.7 ~ C) even under relatively cool daytime air temperatures of 32 ~ C. Apparent digestibility of algal food measured both during feeding trials and by Mn 2+ AAS (atomic absorption spectrometry) for freeranging iguanas was 70%, independent of body size and temperature. The red algae prevailing in the diet were high in protein (30% dry mass) and energy (12.1 kJ/g dry mass). Diving iguanas had higher rates of energy intake than intertidal foragers, but daily intake was less. Maintenance of high body temperature enabled hatchlings to achieve high digestion rates and, combined with high relative intake, thus achieve sufficient energy intake for rapid growth despite higher mass specific metabolic rates. Estimates of biomass of marine iguanas and their algal food are given for a section of coastline on Santa F6.

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Section: Digestive Physiologymentioning

confidence: 99%

Ontogenetic changes in food intake and digestion rate of the herbivorous marine iguana (Amblyrhynchus cristatus, Bell)

Wikelski

Gall²,

Trillmich³

1993

Oecologia

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“…Heliothermy is most frequently employed by animals inhabiting environments that do not offer sufficient opportunities to heat convectively (Navas 1997). Heliothermic lizards are able to maintain T b s over 15˚C despite ambient temperatures (T a ) of 0˚C (Van Damme et al 1990) or achieve T b s 30˚C above T a (Cole 1943;Pearson 1977). Several terms are also employed to refer to specific and critical thermal limits of an animal (Table 8.1).…”

Section: Thermoregulatory Terminologymentioning

confidence: 99%

“…The rate of food processing is well known to increase with temperature in ectotherms (Avery et al 1993;Skoczylas 1970;Van Damme et al 1991;Waldschmidt et al 1986). However, like locomotion, its rate is dependent on several components including rates of food intake, mechanical digestion, chemical digestion, and gastric clearance.…”

Section: Food Processingmentioning

confidence: 99%

“…However, like locomotion, its rate is dependent on several components including rates of food intake, mechanical digestion, chemical digestion, and gastric clearance. While appetite is generally increased (Greenwald 1974;Lang 1979) and prey-handling times are generally reduced with increased temperature (Avery et al 1982;Van Damme et al 1991), much less is known about the specific mechanisms accounting for accelerated food processing with increased temperature (Greenwald and Kanter 1979).…”

Section: Food Processingmentioning

confidence: 99%

“…Many of these biological responses are simply the converse of the effects caused by high temperatures. For example, at certain temperatures, relatively demanding activities like digestion (Harwood 1979;Skoczylas 1970) or locomotion can be reduced or even halted (Emshwiller and Gleeson 1997;JohnAlder et al 1989;Rome 1990;Van Damme et al 1991).…”

Section: Cool Temperaturesmentioning

confidence: 99%

See 2 more Smart Citations

Temperature-Dependent Sex Determination in Vertebrates

Valenzuela¹,

Lance²

2018

Open Monographs

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Do boating and basking mix? The effect of basking disturbances by motorboats on the body temperature and energy budget of the northern map turtle

Jain-Schlaepfer

Blouin‐Demers

Cooke

et al. 2016

Aquatic Conservation

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1. Basking is the primary mechanism used by many freshwater turtles to maintain their body temperature (T b ) in a range that maximizes physiological performance. Basking turtles are easily disturbed by motorboats, but the consequences of the increasingly popular use of motorboats on turtles is largely unknown.2. In this work, predictive models built from field and laboratory data were used to assess the effects of the frequency of basking disturbance by motorboats on T b and metabolic rate (MR) of female northern map turtles (Graptemys geographica), a species of conservation concern.3. Simulations revealed that the effects of boat disturbance vary seasonally. In early May, a conservative estimate of the disturbance rate (0.15 per hour) resulted in a 0.34°C decrease in mean daily T b , which translated to a 7.8% reduction in mean MR. In June, July and August, owing to warmer lake temperatures, the effect of disturbance was less marked and the observed disturbance rates (0.32, 0.96 and 1.23 per hour, respectively) reduced the mean MR of an adult female by 2.1%, 0.5%, and 0.4 %, respectively. 4. Reduction in MR decreases the rate of energy assimilation, which could translate into sublethal effects on turtles, such as reduced growth and reproductive output.5. Motorboat usage is increasing in many areas and is probably affecting other species of freshwater turtles that use aerial basking. This study offers important insights on the implications of disturbances for species that bask.

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The Thermal Dependence of Feeding Behaviour, Food Consumption and Gut-Passage Time in the Lizard Lacerta vivipara Jacquin

Cited by 206 publications

References 44 publications

Ontogenetic changes in food intake and digestion rate of the herbivorous marine iguana (Amblyrhynchus cristatus, Bell)

Ontogenetic changes in food intake and digestion rate of the herbivorous marine iguana (Amblyrhynchus cristatus, Bell)

Temperature-Dependent Sex Determination in Vertebrates

Do boating and basking mix? The effect of basking disturbances by motorboats on the body temperature and energy budget of the northern map turtle

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