Life-cycle and production of the burrowing mayfly, Ephemera danica: a new method for estimating degree-days required for growth.

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Abstract

A maximum likelihood method was used to estimate the number of degree-days required to complete E. danica nymphal growth in the River Tud, Norfolk. Minimum threshold temperatures for growth were 2.6oC for males and 3.1oC for remales. From the estimates of degree-days required to reach maturity and the temperature regime of the study site, it was concluded that some larger males should emerge as adults in 1yr, whereas the rest, and all females, should take 2yr to mature. This agrees with the pattern observed in size-frequency distribution of E. danica nymphs throughout the year. Annual population production of the 2yr classes combined was 5.58g dry weight m-2yr-1, with the older year-class contributing approx 85% of the total. Females accounted for 60-70% of production. Monthly production in summer was as much as 10- times that in winter. Production biomass ratios showed relatively low values (<2.1), a pattern that may be general in semi-voltine species.-from Author

Original languageEnglish
Pages (from-to)919-930
Number of pages12
JournalJournal of Animal Ecology
Volume54
Issue number3
DOIs
Publication statusPublished - Jan 1 1985
Externally publishedYes

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Ephemera danica
mayfly
burrowing
Ephemeroptera
heat sums
life cycle (organisms)
life cycle
nymphs
biomass production
temperature
rivers
winter
summer
biomass
methodology
river
method

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

Cite this

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title = "Life-cycle and production of the burrowing mayfly, Ephemera danica: a new method for estimating degree-days required for growth.",
abstract = "A maximum likelihood method was used to estimate the number of degree-days required to complete E. danica nymphal growth in the River Tud, Norfolk. Minimum threshold temperatures for growth were 2.6oC for males and 3.1oC for remales. From the estimates of degree-days required to reach maturity and the temperature regime of the study site, it was concluded that some larger males should emerge as adults in 1yr, whereas the rest, and all females, should take 2yr to mature. This agrees with the pattern observed in size-frequency distribution of E. danica nymphs throughout the year. Annual population production of the 2yr classes combined was 5.58g dry weight m-2yr-1, with the older year-class contributing approx 85{\%} of the total. Females accounted for 60-70{\%} of production. Monthly production in summer was as much as 10- times that in winter. Production biomass ratios showed relatively low values (<2.1), a pattern that may be general in semi-voltine species.-from Author",
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T2 - a new method for estimating degree-days required for growth.

AU - Tokeshi, Mutsunori

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N2 - A maximum likelihood method was used to estimate the number of degree-days required to complete E. danica nymphal growth in the River Tud, Norfolk. Minimum threshold temperatures for growth were 2.6oC for males and 3.1oC for remales. From the estimates of degree-days required to reach maturity and the temperature regime of the study site, it was concluded that some larger males should emerge as adults in 1yr, whereas the rest, and all females, should take 2yr to mature. This agrees with the pattern observed in size-frequency distribution of E. danica nymphs throughout the year. Annual population production of the 2yr classes combined was 5.58g dry weight m-2yr-1, with the older year-class contributing approx 85% of the total. Females accounted for 60-70% of production. Monthly production in summer was as much as 10- times that in winter. Production biomass ratios showed relatively low values (<2.1), a pattern that may be general in semi-voltine species.-from Author

AB - A maximum likelihood method was used to estimate the number of degree-days required to complete E. danica nymphal growth in the River Tud, Norfolk. Minimum threshold temperatures for growth were 2.6oC for males and 3.1oC for remales. From the estimates of degree-days required to reach maturity and the temperature regime of the study site, it was concluded that some larger males should emerge as adults in 1yr, whereas the rest, and all females, should take 2yr to mature. This agrees with the pattern observed in size-frequency distribution of E. danica nymphs throughout the year. Annual population production of the 2yr classes combined was 5.58g dry weight m-2yr-1, with the older year-class contributing approx 85% of the total. Females accounted for 60-70% of production. Monthly production in summer was as much as 10- times that in winter. Production biomass ratios showed relatively low values (<2.1), a pattern that may be general in semi-voltine species.-from Author

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