Effect of activity duration on recovery and metabolic costs in the desert iguana (Dipsosaurus dorsalis)

Hancock, Thomas V.; Adolph, Stephen C.; Gleeson, Todd T.

doi:10.1016/s1095-6433(01)00365-8

Cited by 21 publications

(39 citation statements)

References 40 publications

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“…More specifically, corticosterone levels produced by stressful situations are associated with the rapid change of free fatty acid concentrations in blood (Harris et al, 1994;Palokangas and Vihko, 1971), which may later be reflected in femoral gland secretions composition. Alternatively, or in addition, the observed changes might be a product of increased physical activity per se during the repeated escape responses (Hancock et al, 2001), which can lead to decreased growth rates in juvenile lizards (Civantos et al, 2010). Whatever the mechanism involved, it is likely that increased corticosterone levels due to the stress of higher predation risk produce metabolic changes that may also be reflected in chemical composition of chemosignals (Fig.…”

Section: Stress Hormonesmentioning

confidence: 99%

Condition-dependent chemosignals in reproductive behavior of lizards

Martı́n

López

2015

Hormones and Behavior

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This article is part of a Special Issue "Chemosignals and Reproduction". Many lizards have diverse glands that produce chemosignals used in intraspecific communication and that can have reproductive consequences. For example, information in chemosignals of male lizards can be used in intrasexual competition to identify and assess the fighting potential or dominance status of rival males either indirectly through territorial scent-marks or during agonistic encounters. Moreover, females of several lizard species "prefer" to establish or spend more time on areas scent-marked by males with compounds signaling a better health or body condition or a higher genetic compatibility, which can have consequences for their mating success and inter-sexual selection processes. We review here recent studies that suggest that the information content of chemosignals of lizards may be reliable because several physiological and endocrine processes would regulate the proportions of chemical compounds available for gland secretions. Because chemosignals are produced by the organism or come from the diet, they should reflect physiological changes, such as different hormonal levels (e.g. testosterone or corticosterone) or different health states (e.g. parasitic infections, immune response), and reflect the quality of the diet of an individual. More importantly, some compounds that may function as chemosignals also have other important functions in the organism (e.g. as antioxidants or regulating the immune system), so there could be trade-offs between allocating these compounds to attending physiological needs or to produce costly sexual "chemical ornaments". All these factors may contribute to maintain chemosignals as condition-dependent sexual signals, which can inform conspecifics on the characteristics and state of the sender and allow making behavioral decisions with reproductive consequences. To understand the evolution of chemical secretions of lizards as sexual signals and their relevance in reproduction, future studies should examine what information the signals are carrying, the physiological processes that can maintain the reliability of the message and how diverse behavioral responses to chemosignals may influence reproductive success.

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Section: Stress Hormonesmentioning

confidence: 99%

Condition-dependent chemosignals in reproductive behavior of lizards

Martı́n

López

2015

Hormones and Behavior

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“…In fact, the number of studies of EPOC in all ectotherms is quite limited (e.g. Heath and Prichard, 1962;Brett, 1964;Smit, 1965;Smit et al, 1971;Scarabello et al, 1991Scarabello et al, , 1992Gleeson, 1991;Reidy et al, 1995;Hancock et al, 2001) compared with mammals (e.g. Bahrm and Maehlum, 1986;Bangsbo et al, 1997;Baker and Gleeson, 1998 The present study measured the excess post-exercise oxygen cost (EPOC) following tests at critical swimming speed (U crit) in three stocks of adult, wild, Pacific salmon (Oncorhynchus sp.)…”

mentioning

confidence: 99%

Excess post-exercise oxygen consumption in adult sockeye(Oncorhynchus nerka) and coho (O. kisutch) salmon following critical speed swimming

Lee

Farrell

Lotto

et al. 2003

Journal of Experimental Biology

233

238

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test temperature. The non-aerobic cost of swimming to Ucrit was estimated to add an additional 21.4-50.5% to the oxygen consumption measured at U crit. While these nonaerobic contributions to swimming did not affect the minimum cost of transport, they were up to three times higher than the value used previously for an energetic model of salmon migration in the Fraser River, BC, Canada. As such, the underestimate of non-aerobic swimming costs may require a reevaluation of the importance of how in-river barriers like rapids and bypass facilities at dams, and year-to-year changes in river flows and temperatures, affect energy use and hence migration success.

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“…For instance, it has been shown that the metabolic costs associated with short and intense activity in the lizard Dipsosaurus dorsalis are large enough to impact the energy budget (Hancock et al, 2001). Thus, the antipredatory response to predator attacks by means of escaping behavior can have significant consequences when there is a high predation pressure in natural conditions.…”

Section: Discussionmentioning

confidence: 99%

Increased predation risk modifies lizard scent‐mark chemicals

2008

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Variation in environmental factors plays a central role on organisms' physiological changes. However, the physiological response to predation risk has rarely been investigated in reptiles. Chemical senses are important for intraspecific communication in squamate reptiles. In male lizards Iberolacerta cyreni the maintenance of relative proportions of lipids in femoral gland secretions is costly, which may ensure honest signalling of quality. We hypothesized that increased predation risk should compromise the maintenance of such lipid proportions, as both a fear response and escaping behavior can have physiological consequences. We simulated predator attacks and found that relative proportions of lipids in femoral gland secretions changed in disturbed lizards but not in control ones. Thus, predator-prey interactions may modulate relative concentrations of chemicals in scents of lizards. Potential consequences of this effect on intraspecific chemical communication are suggested.

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Effect of activity duration on recovery and metabolic costs in the desert iguana (Dipsosaurus dorsalis)

Cited by 21 publications

References 40 publications

Condition-dependent chemosignals in reproductive behavior of lizards

Condition-dependent chemosignals in reproductive behavior of lizards

Excess post-exercise oxygen consumption in adult sockeye(Oncorhynchus nerka) and coho (O. kisutch) salmon following critical speed swimming

Increased predation risk modifies lizard scent‐mark chemicals

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