Life History and Ecology of the Five-Lined Skink, Eumeces fasciatusFitch, Henry S. (Henry Sheldon)
Science
Life History and Ecology of the Five-Lined Skink, Eumeces fasciatus
Fitch, Henry S. (Henry Sheldon)
Eumeces fasciatus
The one caught had suffered but little injury in the fight.
Numerous tooth marks were discernible as minute abrasions on the surface
of the scales, but the bony dermal armor had not been perceptibly
penetrated during the prolonged and violent struggle.
EGGS
The eggs of _Eumeces fasciatus_ are like diminutive chicken eggs in
appearance. They are white when first laid, slightly translucent when
held to the light. Within a day or two after they are laid, these eggs
are soiled to a dull tan color, somewhat mottled, as a result of being
rolled and dragged about in contact with the floor and wall of the nest
burrow. Like the eggs of most other reptiles, those of _Eumeces
fasciatus_ have parchmentlike shells. These shells are thin and easily
punctured. As incubation proceeds, the egg enlarges by gradual
absorption of moisture and the somewhat elastic shell is stretched. An
egg left in water for as much as a day does not gain in weight
appreciably. Except for occasional abnormal ones, the eggs of any one
clutch are notably uniform in size and shape at the time they are laid.
As incubation proceeds, some eggs enlarge more rapidly than others, and
attain larger ultimate size. Differences in shape also appear, some eggs
becoming relatively elongate and thin, while others are thick and blunt.
Some become distorted to asymmetrical shapes. In nests that have been
deserted by the females, eggs of irregular shape are especially
noticeable. It seems probable that the frequent shifting of the eggs by
the female prevents unequal drying or stretching in different areas of
the shell. Normal young were observed to hatch from grossly misshapen
eggs. Under conditions of drought, the eggs may not enlarge normally
during the latter part of incubation, and may become indented or partly
collapsed, and yet apparently normal young hatch from them. Both in the
field, and in laboratory experiments, eggs were found to have remarkable
tolerance for excess moisture. After heavy rains of summer
thunderstorms, nests were sometimes found to have water trickling
through them, and on occasion eggs were found to be partly submerged in
water in the nest cavity. Exposed rocks at the heads of small gullies
often were chosen by the female skinks as the shelter for their nests.
In these situations the nests were exposed to run-off water. In July,
1951, especially, unusually heavy precipitation resulted in the flooding
of many nests. In some instances desertion by the females and
destruction of the eggs seemed to have been caused by this flooding,
even in the well-drained hillside situations where this study was made.
Table 5.--Measurements in Millimeters and Weights in Grams of Eggs
in the Same Clutch at Different Stages During Their Incubation,
Showing Gradual Increase in Size.
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