Metabolism: Effect Of Temperature On Edno And Ecto Essay

This essay has a total of 1068 words and 4 pages.

Metabolism: Effect Of Temperature On Edno And Ectotherms

Animal metabolism consists of the utilization of nutrients absorbed from the digestive
tract and their catabolism as fuel for energy or their conversion into substances of the
body. Metabolism is a continuous process because the molecules and even most cells of the
body have brief lifetimes and are constantly replaced, while tissue as a whole maintains
its characteristic structure. This constant rebuilding process without a net change in the
amount of a cell constituent is known as dynamic equilibrium (Grolier1996). In the
combustion of food, oxygen is used and carbon dioxide is given off. The rate of oxygen
consumption indicates the energy expenditure of an organism, or its metabolic rate
(Grolier1996).Metabolic rate is directly linked to the core temperature in an animal. An
ectotherm, or cold blooded animal, warms its body mainly by absorbing heat from its
surroundings. The amount of heat it derives from its metabolism is negligible. In
contrast, endotherms derive most or all of its body heat from its own metabolism
(Campbells,p899). Because ectotherms do not produce their own heat, they cannot actively
ensure their ideal temperature for an ideal metabolic rate (aquacult.htp). In the
following experiment, we will attempt to examine the relationship between metabolic rate
and environmental temperature in both an ectoderm and an endotherm. I predict that for the
ectotherm, the metabolic rate will increase as the outside environment temperature will
increase. I also predict that the metabolic rate in the endotherm will remain relatively
the same as the outside environment temperature changes. I also make the prediction that
the ectotherm will have much lower metabolic rates than the endotherm.The procedures for
this experiment are those that are referred to in Duncan and Townsend, 1996 p9-7. In our
experiment however, each student group chose a temperature of either 5 C, 10 C, 15 C, or
20 C. Each group selected a crayfish, and placed it in an erlenmeyer flask filled with
distilled water. The flask's O2 levels had already been measured. the flask was then
placed in a water bath of the selected temperature for thirty minutes, and then the O2
levels were measured again. Each group shared their findings with the class. The metabolic
rates of the mouse were conducted by the instructor and distributed. We also did not use
the Winkler method to measure the O2 levels. We used a measuring device instead. The
results of this experiment are shown in the compiled student data in Table 1 below. the
metabolic rates of the mouse remained constant with a slight flux, however, the crayfish
metabolic rates were very different from one another.Table 1: Metabolic Rates of Mouse and
Crayfish at Various TemperaturesTemperature C Metabolic Rate of Mouse (ml O2/min/gm)
Metabolic Rate of Crayfish (ml O2/min/gm)5 0.18 1.0410 0.19 0.3815
0.14 0.0520 0.11 0.26The regression equations that were calculated for both
the mouse and the crayfish were determined through the formula Y = bXi a. The results
were Y = -5.2E-3 X 0.22 for the mouse, and Y = -0.05 X 1.1 for the crayfish. To view
the procedures for these calculations, view p9-6 in Duncan and Townsend, 1996. Both of
these equations have a negative slope, though the slope for the crayfish is substantially
larger. The metabolic rates for the crayfish were also higher than the mouse's metabolic
rates.Based on the results of this experiment, it was shown that as the temperature of the
external environment rose, the metabolic rates of both organisms fell. It was also shown
that the crayfish had a higher metabolic rate than the mouse. My hypothesis was completely
incorrect in stating that the crayfish would have a lower metabolic rate than the mouse.
Continues for 2 more pages >>




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