Individual variation in metabolic reaction norms over ambient temperature causes low correlation between basal and standard metabolic rate

The body temperature (Tb) and standard metabolic rate (SMR) of female Eremias multiocellata Günther, 1872, a viviparous lizard, were measured at 25, 30, and 35 °C during pregnancy and after parturition to assess energy requirement of reproduction. The results showed that the Tbs of female lizards were slightly higher than actual ambient temperature in the 25 and 30 °C groups, while they were slightly lower than ambient temperature in the 35 °C group. Ambient temperature significantly affected SMR and gestation period of females. Energy requirement was constant in nonpregnant females, whereas it was increased in pregnant females. The maximal estimates of maintenance costs of pregnancy (MCP) were 4.219, 4.220, and 4.448 mg CO2·min–1, which accounted for 19.40%, 14.15%, and 12.32% of the total metabolic rate in the 25, 30, and 35 °C group, respectively. The results indicated the MCP was an important component of total energy cost for the lizard E. multiocellata and the MCP in this lizard incurs a relative fixed energetic cost irrespective of ambient temperature.

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Peer Review #2 of "The role of ambient temperature and body mass on body temperature, standard metabolic rate and evaporative water loss in southern African anurans of different habitat specialisation (v0.2)"

10.7287/peerj.7885v0.2/reviews/2 ◽

2019 ◽

Keyword(s):

Body Temperature ◽

Metabolic Rate ◽

Ambient Temperature ◽

Peer Review ◽

Water Loss ◽

Standard Metabolic Rate ◽

Evaporative Water ◽

Habitat Specialisation ◽

Temperature Standard

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Peer Review #1 of "The role of ambient temperature and body mass on body temperature, standard metabolic rate and evaporative water loss in southern African anurans of different habitat specialisation (v0.2)"

10.7287/peerj.7885v0.2/reviews/1 ◽

2019 ◽

Keyword(s):

Body Temperature ◽

Metabolic Rate ◽

Ambient Temperature ◽

Peer Review ◽

Water Loss ◽

Standard Metabolic Rate ◽

Evaporative Water ◽

Habitat Specialisation ◽

Temperature Standard

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Mosaic metabolic ageing: Basal and standard metabolic rate age in opposite directions and independent of environmental quality, sex or lifespan in a passerine

10.1101/844266 ◽

2019 ◽

Author(s):

Michael Briga ◽

Simon Verhulst

Keyword(s):

Metabolic Rate ◽

Ambient Temperature ◽

Environmental Quality ◽

Basal Metabolic Rate ◽

Standard Metabolic Rate ◽

Ageing Process ◽

List Type ◽

Ambient Temperatures ◽

Metabolic Traits ◽

Ageing Rate

AbstractCrucial to our understanding of the ageing process is identifying how traits change with age, which variables alter their ageing process and whether these traits associate with lifespan.We here investigated metabolic ageing in zebra finches. We longitudinally monitored 407 individuals during six years and collected 3213 measurements of two independent mass-adjusted metabolic traits: basal metabolic rate (BMRm) at thermoneutral temperatures and standard metabolic rate (SMRm), which is the same as BMRm but at ambient temperatures below thermoneutrality.BMRmdecreased linearly with age, consistent with earlier reports. In contrast, SMRmincreased linearly with age. To the best of our knowledge, this is the first quantification of SMRm ageing, and thereby of the contrast between SMRm and BMRm ageing.Neither metabolic rate nor metabolic ageing rate were associated with individual lifespan. Moreover, experimental manipulations of environmental quality that decreased BMRm and SMRm and shortened lifespan with 6 months (12%) did not affect the ageing of either metabolic trait. Females lived 2 months (4%) shorter than males, but none of the metabolic traits showed sex-specific differences at any age.Our finding that ageing patterns of metabolic rate vary depending on the ambient temperature illustrates the importance of studying ageing in an ecologically realistic setting.Our results add to the mounting evidence that within an organism ageing is an asynchronous process.

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Relationship between individual variation in morphological characters and swimming costs in brook charr (Salvelinus fontinalis) and yellow perch (Perca flavescens)

Journal of Experimental Biology ◽

10.1242/jeb.205.7.1031 ◽

2002 ◽

Vol 205 (7) ◽

pp. 1031-1036 ◽

Cited By ~ 1

Author(s):

Patrice Boily ◽

Pierre Magnan

Keyword(s):

Metabolic Rate ◽

Individual Variation ◽

Yellow Perch ◽

Body Shape ◽

Perca Flavescens ◽

Standard Metabolic Rate ◽

Morphological Characters ◽

Brook Charr ◽

Indirect Consequence ◽

Thrust Forces

SUMMARY The objective of this study was to examine if individual variation in morphological characters is related to swimming costs in wild and domestic brook charr, and in wild yellow perch. Our results indicate that absolute swimming cost was higher in wild and domestic brook charr individuals having a stout body shape, and these individuals are therefore less efficient swimmers. These results are consistent with field observations that described relationships between individual variation in morphology and habitat use in salmonids. Further analyses indicated that standard metabolic rates were higher in individuals having a stout body shape, and that net swimming cost was not related to body shape. Accordingly, the higher swimming cost of stout individuals is probably an indirect consequence of an increase in standard metabolic rate. In wild yellow perch, absolute and net swimming costs were higher in individuals having a stout body shape and a low aspect caudal fin,and standard metabolic rate was not related to body shape. Therefore, in contrast to brook charr, individual variation in the swimming cost of yellow perch appears to be related to morphological characters that affect drag and thrust forces, which is consistent with previously published inter-specific observations.

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