Life History and Secondary Production of Caenis latipennis Banks (Ephemeroptera: Caenidae) in Honey Creek, Oklahoma Page: 24
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Relative abundance of nymphs in each of the five development classes over time
showed similar results (Figure 13). The fall generation was defined by an increase in
development class V in conjunction with an emergence peak. Continuous recruitment
from fall ovipostion was represented by a growing abundance of development class II
throughout the winter months followed by a rise in abundance of higher development
classes. In addition, development classes III and IV were well represented throughout
winter. Individuals recruited in early fall over winter at these higher development classes
and emerged in conjunction with the April emergence peak. Individuals recruited later
over winter at lower development classes and emerged during the May peak. An early
summer cohort was recruited in May and completes development in late June
corresponding to a late June peak in emergence. Recruitment of an additional summer
cohort occurs in late June and develops until emergence in August.
Proposed cohort lines from development frequency analysis agreed with egg and
larval development rates based on degree day estimates (Figure 20). Cohort 1 is well
represented by development frequency analysis and degree day estimates. The over
wintering generation (Cohort 2) corresponds well with development frequency analysis
and the three predicted sub cohorts. The two fast developing summer cohorts are clearly
defined by development frequency analysis and degree day estimates.
Multivoltine life cycles are common in Ephemeroptera, especially in warm temperate
and tropical waters (Clifford, 1982; Brittian, 1990). The C. latipennis population in
Honey Creek exhibits a non-seasonal multivoltine life cycle type described by Clifford
(1982). Clifford lists 3 records of this life cycle type for Caenis but does not site
examples or name species. C. luctrosa from Spain is the only other documented non-24
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Taylor, Jason M. Life History and Secondary Production of Caenis latipennis Banks (Ephemeroptera: Caenidae) in Honey Creek, Oklahoma, thesis, August 2001; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc2863/m1/31/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .