Life history and production of Ephoron album (Say) (Ephemeroptera: Polymitarcidae) in the Valley River, Manitoba
1985; NRC Research Press; Volume: 63; Issue: 7 Linguagem: Inglês
10.1139/z85-248
ISSN1480-3283
AutoresDonna Giberson, Terry D. Galloway,
Tópico(s)Aquatic Invertebrate Ecology and Behavior
ResumoEphoron album was the dominant summer mayfly in shallow riffles in the agricultural zone of the Valley River, Manitoba, in 1982 and 1983. There was one generation per year; eggs deposited in August hatched in late May of the following year and nymphs developed rapidly during the summer months. The eggs required a cold period to promote hatching and hatching success of eggs treated in the laboratory at −2 °C for varying periods of time was positively correlated to the length of the exposure period. No eggs hatched following exposure to 4 or 10 °C. Production for 1982 was estimated by four methods for the production interval of only 72 days: the instantaneous growth rate method (1.32 ± 0.44 g fresh dry weight∙m −2 ∙year −1 ), the Allen curve method (1.32 g∙m −2 ∙year −1 ), the removal – summation method (1.43 ± 0.41 g∙m −2 ∙year −1 ), and the size–frequency method (1.48 ± 0.51 g∙m −2 ∙year −1 ). Confidence intervals (95%) were calculated using the method of C. C. Krueger and F. B. Martin for the size–frequency estimate of production and by bootstrapping for the removal–summation and instantaneous growth estimates.
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