Figure 2 Geographic range of the Eastern Fence Lizard Sceloporus undulatus' Diamonds indicate approx

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Figure 2 - Geographic range of the Eastern Fence
Lizard (Sceloporus undulatus). Diamonds indicate
approximate locations of published field studies.
The STAR is the Pine Barrens site in New Jersey.
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Figure 4A - As an observer viewed the tape, s/he
tracked the lizards movements by moving a
commercially available plan scanner
(Scale-LinkTM) exactly over the image of the
lizard as it moved back and forth in the chamber
(Figure 4). We wrote a LINUX driver for this
device and a C program to log the scaler output
into a computer file.http//www.scalex.com/
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Figure 4A - Time lapse video image of lizards in
their metabolic chambers. Observers used these
images to track a lizards movements as it moved
back and forth in the chamber.
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75 actual size
Figure 4B - Observers tracked the lizards
movements by moving a plan scanner (Scale-LinkTM,
www.scalex.com) over the video image of the
lizard as it moved back and forth in the chamber.
Bob Neveln wrote a LINUX driver for this device
and a C program to log the scaler output - the
full documentation to this software is available
in Neveln, B. 2000. Linux Assembly Language
Programming. Prentice Hall. (example 11.4,
pages 197-211). software available from the
author, neveln_at_cs.widener.edu
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Specific Dynamic Effect
Metabolic Rate digesting
Metabolic Rate (oxygen consumption/ time
Metabolic Rate fasting
fed
defecated
time
Figure 1 - The Specific Dynamic Effect (SDE) is
the integrated difference between an animals fed
and fasting metabolic rates.
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B
A
metabolic rate (ml O2/h)
C
total distance (cm)
Figure 7 Representative data showing the
relationship between the total distance of
movements in the chamber and metabolic rate (for
lizard 4, unfed runs, 35oC, on 6/17/98). Each
datum stems from a 24 minute O2 consumption run
and analysis of the corresponding segment of the
video tape movement record. The actual movement
traces for points marked A, B, and C appear in
Figure 8.
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Figure 10 Adjusted metabolic rates for the
fed and unfed runs versus time over the time from
feeding to defecation for lizard 4 (6/17-19/98,
35oC).
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using adjusted metabolic rates
Lizard ID
using unadjusted metabolic rates
Lizard ID
Table 2 - Estimates of Specific Dynamic Effect
(? SDE), the of ingested food energy spent on
digestion, and the rise in metabolism due to
digestion using the adjusted metabolic rates
(after removing the effects of activity) and
using the raw metabolic rate measurements.
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adjusted unfed
unadjusted unfed
adjusted fed
unadjusted fed
Figure 11 - Average adjusted and unadjusted
metabolic rates for four lizards in fed and unfed
states at 300C. There was a significant
difference between the means of adjusted fed and
unfed metabolic rates (t-test, t 3.38, Plt0.03),
but no difference between the means of unadjusted
fed and unfed metabolic rates of these four
lizards.