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Çѱ¹ÇÏõȣ¼öÇÐȸ / v.32, no.3, 1999³â, pp.253-253
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( Comparisons of Temperature-Related Life Histories in Two Ephemerid Mayflies (Ephemera separigata and E. strigata: Ephemeridae, Ephemeroptera, Insecta) from a Mountain Stream in Korea ) |
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| Temperature-related life history adaptations in two ephemerid mayflies, Ephemera separigata and E. strigata, were studied from a mountain stream in Korea. Three study sites were chosen based on the attitudinal distributions, of the Ephemera populations (upstream and midstream sites: E. separigata ; downstream site: E. strigata). Samplings were taken monthly front February 1997 to January 1998, but semimonthly during the emergence period. Water temperature was monitored hourly from May 1997 to January 1998. As results, three sites represented their own temperature regimes (mean temperature upstream: $9.39^{circ}C$; midstream: $10.38^{circ}C$; downstream: $12.70^{circ}C$). Both E. separigata and E. strigata showed evident univoltine life history pattern and two cohorts were recognized in each population based on the analyses of body length and larval developmental stages. The emergences took place from late May to late June, but earlier at the lower sites. Larval recruitments occurred during the emergence period (summer cohort) and $5{sim}6$ months later from the emergence period (winter cohort). It was hypothesized that either egg diapause or parthenogenesis could be the cause of the two periodically different early instar recruitments. Total accumulated degree day of E. separigata was 2380 and 2668 at the upstream and midstream site, respectively, and that of E. strigata was 3220 at the downstream site. It was estimated that the egg hatching and average larval growth of E. separigata could be delayed to ca. 22 days and ca. 15 days, respectively, as the annual average water temperature drops to $1^{circ}C$. Ephemera separigata showed a cold adapted life history pattern, and more discussions on the intraspecific and interspecific life history adaptations were provided with other Korean and Japanese congeners. |
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| Ű¿öµå |
| Ephemera separigata;Ephemera strigata;Ephemeroptera;Life history;Temperature;Korea; |
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Çѱ¹ÇÏõȣ¼öÇÐȸÁö / v.32, no.3, 1999³â, pp.253-253
Çѱ¹ÇÏõȣ¼öÇÐȸ
ISSN : 1976-8087
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO199910102424369)
¾ð¾î : ¿µ¾î |
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| ³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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