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BMR and Body Mass Comparison between Endothermic and Ectothermic Organisms…
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Abstract
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Background
Kleiber's law explains that an organisms' metabolic rate is equivalent to the animal's body mass raised to the 3/4 power.
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Introduction
Question Hypothesis
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One can state that ectotherms are dependent on external sources of heat; endotherms support themselves by the internal generation of heat. Under these conditions, one could hypothesize that reptiles and amphibians have a slower mass-specific metabolic rate.
Background
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Basal metabolic rate can be computed by quantifying the amount of energy expended by an animal at rest
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Methods
Materials
Several species were removed (prior to graphing) from the dataset because their data points were far greater or smaller than the mean data-point. Potential factors that could alter the outcome of this experiment are outliers.
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Design
An excel sheet was created to statistically analyze and assess the relationships between the dataset.
This data was obtained by utilizing the query forum to retrieve data (body-mass and BMR) for the Amphibia, Aves, and Mammalia classes.
The independent variable would be the body masses of the amphibians and birds; the dependent variable would be the basal metabolic rate.
Procedure
Several species were removed (prior to graphing) from the dataset because their data points were far greater or smaller than the mean data-point.
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Discussion
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Middle Paragraph
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Data demonstrates no correlational relationship (among Amphibia) between the basal metabolic rate and body mass.
Concluding Paragraph
This study proves there is a significant relationship between body mass and metabolic rate in homeotherms and poikilotherms.
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Results
Figures
Figure 1a. Mammalia: BMR vs Body Mass
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BMR vs. Body Mass
Figure 1b. Aves: BMR vs Body Mass
Paragraphs
In the classes Mammalia and Aves, there is a negative correlation between mass-specific BMR and body mass.
In the classes Mammalia and Aves, there is a positive correlation between BMR and body mass.
Literature Cited
End Citation
Glazier DS. 2008. Effects of Metabolic Level on the Body Size Scaling of Metabolic Rate in Birds and Mammals. Royal Society. 275:1405–1410.
Speakman J. 2005. Body size, energy metabolism and lifespan. The Journal of Experimental Biology 208 (9): 1717-1730.
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Zari TL. 2016. Seasonal metabolic acclimatization in the herbivorous desert lizard Uromastyx philbyi (Reptilia: Agamidea) from western Saudi Arabia. Journal of Thermal Biology. 60:180–185. doi:https://doi.org/10.1016/j.jtherbio.2016.07.014
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