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The viability of Sphaeridiotrema pseudoglobulus (Digenea) eggs following cold water storage as a possible overwintering strategy

Title:

The viability of Sphaeridiotrema pseudoglobulus (Digenea) eggs following cold water storage as a possible overwintering strategy

McKindsey, Christopher W and McLaughlin, J. Daniel (1993) The viability of Sphaeridiotrema pseudoglobulus (Digenea) eggs following cold water storage as a possible overwintering strategy. Parasitology, 107 (4). pp. 441-447. ISSN 0031-1820

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Official URL: http://dx.doi.org/10.1017/S0031182000067809

Abstract

Sphaeridiotrema pseudoglobulus is a digenean parasite believed to be involved in a yearly fall die-off of ducks in Québec, Canada. Hatching characteristics of eggs stored at 7°C for 0–28 weeks in the lab and following maintenance overwinter in a lake are described. The hatching success of eggs stored for 4–28 weeks remained constant (71–81 %) but slightly less than that observed in fresh eggs (90%). The hatching success of eggs kept overwinter under natural conditions did not differ from that of eggs stored an equivalent length of time in the lab at 7°C (74·7 and 75·8%, respectively). With the exception of fresh eggs (17·7 days), the mean hatch time of eggs steadily decreased with increased storage time (18·9 days following 4 weeks storage to 11·4 days at 28 weeks storage) due to a slow embryonation of the eggs at 7°C. Hatching characteristics of a subsample of eggs incubated at 10, 15 and 20°C were compared and the embryonation rate was found to increase with incubation temperature. The majority of eggs stored at 10°C embryonated but failed to hatch. When their incubation temperature was raised to 15°C, a further 46% hatched within the following week. The survivorship functions of miracidia hatching from eggs stored for 8, 12, 16 and 20 weeks differed but the mean expected life-span of the miracidia did not decline with increasing storage time as expected. The results of these experiments are discussed in relation to the potential importance of overwintered eggs in the development of the infective pool of metacercariae.

Divisions:Concordia University > Faculty of Arts and Science > Biology
Item Type:Article
Refereed:Yes
Authors:McKindsey, Christopher W and McLaughlin, J. Daniel
Journal or Publication:Parasitology
Date:November 1993
Keywords:Sphaeridiotrema pseudoglobulus; overwintering; trematode eggs; dabbling ducks
ID Code:6791
Deposited By:DANIELLE DENNIE
Deposited On:13 Jul 2010 16:03
Last Modified:08 Dec 2010 10:53
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