Effect of Alternating Temperature on Embryonic Developmental Time of the Mayfly Cloeon triangulifer McDunnough
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Authors
Rader, Margaret
Issue Date
1986
Type
Thesis
Language
en_US
Keywords
Alternative Title
Abstract
The number of generations produced annually by the
parthenogenetic mayfly Cloeon trianqulifer varies
throughout its geographic range. It is hypothesized that
in a polyvoltine species such as this one, the effect of a
given temperature on the rate of development for an
individual should remain constant regardless of life stage.
To test this hypothesis, C. triangulifer eggs were
maintained at a constant temperature (l4.7°C) except for 2
days exposure at a higher temperature (24.0oC). Exposure
to the higher temperature occurred at different stages of
embryonic development. Other eggs were kept constantly at
14.7 or 24.0o C as control treatments.
Mean developmental time for the various treatments was
compared to see if the stimulatory effects of the higher
temperature had changed at some point in development. The
length of the developmental period did not differ
significantly among treatment groups exposed at different
stages to both the high and low temperatures, indicating
that the effect of a given temperature did not change
during embryonic development. Possible causes of variation
in developmental time are discussed.
Description
iv, 14 p.
Citation
Publisher
Kalamazoo College
License
U.S. copyright laws protect this material. Commercial use or distribution of this material is not permitted without prior written permission of the copyright holder.