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EFFECTS OF TEMPERATURE AND COLD STORAGE ON DEVELOPMENT TIME AND VIABILITY OF EGGS OF THE BURROWING MAYFLY HEXAGENIA RIGIDA (EPHEMEROPTERA: EPHEMERIDAE)

Published online by Cambridge University Press:  31 May 2012

M.K. Friesen ,
J.F. Flannagan  and
S.G. Lawrence
M.K. Friesen
Affiliation:
Freshwater Institute, Department of Fisheries and Oceans, Winnipeg, Manitoba R3T 2N6
J.F. Flannagan
Affiliation:
Freshwater Institute, Department of Fisheries and Oceans, Winnipeg, Manitoba R3T 2N6
S.G. Lawrence
Affiliation:
Freshwater Institute, Department of Fisheries and Oceans, Winnipeg, Manitoba R3T 2N6
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Abstract

Eggs of Hexagenia rigida McDunnough transferred directly from 20° to 36°, 32°, 28°, 24°, 20°, 16°, 12°, and 8 °C were monitored for start of hatch, hatching rate, success of hatch, and hatching period. Eggs did not hatch at 36 °C or 8 °C. There was a direct relationship between temperature and start of hatch (from day 7 at 32 °C to day 77 at 12 °C). Over 90% hatch occurred at all temperatures except 12 °C. Hatching periods ranged from about 6 days at the higher temperatures to over 80 days at 16 °C and 12 °C. Hatching occurred at 36 °C when eggs were transferred in increments of 4 °C every 2 days.Storage capabilities of eggs in "early", "middle", and "late" stages of embryonic development were tested at 12 °C and 8 °C using a direct or stepwise transfer method. Hatching parameters monitored were hatch rate, success of hatch, and hatching period up to 90% hatch of total number of eggs. Middle stage eggs transferred in a stepwise manner could be held at 8 °C for up to 52 weeks with least effect on hatching parameters. Middle and late stage eggs could be stored for up to 16 weeks at 8 °C using the direct transfer method, and early stage eggs, which were affected most by cold storage, could be held for 2 days at 12 °C with minimal effect on hatching parameters. The storage of eggs, shown here to be possible, is potentially useful for providing such material for bioassays throughout the year.

Type
Articles
Information
The Canadian Entomologist , Volume 111 , Issue 6 , June 1979 , pp. 665 - 673
Copyright
Copyright © Entomological Society of Canada 1979

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