Life Cycle and Synchronization of Nymphal Development of the MayflyEphoron shigaein Japan (Ephemeroptera: Polymitarcyidae)
作者:
Naoshi C. Watanabe,
Akira Ohkita,
期刊:
Aquatic Insects
(Taylor Available online 2000)
卷期:
Volume 22,
issue 2
页码: 108-121
ISSN:0165-0424
年代: 2000
DOI:10.1076/0165-0424(200004)22:2;1-P;FT108
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The life cycle ofE. shigae, including eclosion, nymphal growth, last instar recruitment and adult emergence, was studied in a Japanese river. The synchronization of nymphal development is discussed. Eggs hatched sporadically from mid-March to early April as determined from continuous sampling of eggs from the river substratum. Nymphs attained the last instar in mid- to late August and emerged in mid-September. Size of nymphs at the time of last instar recruitment decreased gradually as did the size of emerging mayflies. Smaller individuals entering the last instar later developed more quickly and required a smaller number of degree-days to complete the last instar than did larger individuals. Consequently, larval development synchronized during the period between last instar recruitment and adult emergence.
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