Abstract
Members of the nonbiting midge family Chironomidae have been used worldwide as water-quality indicators or toxicity test organisms. The purpose of this study was to establish the chironomid Glyptotendipes tokunagai Sasa as a new test species by conducting successive rearing under laboratory conditions. We monitored biological and genetic aspects of >42 successive generations over 7 yr, and also compared the development of the 39th generation with the fourth generation under five constant temperatures of 15, 20, 25, 30, and 35°C. We observed that the number of eggs in an egg mass and the adult body sizes decreased rapidly in the early generations, and thereafter tended to stabilize from the fifth generation to the 42nd generation. In all generations, the mean hatching rate was >75%. Males were predominant in the early generations, but the sex ratio increased to 0.5 (ranged 0.240.61) in later generations. The genetic divergence of the reared generations, analyzed by using the mitochondrial cytochrome c oxidase subunit I gene, decreased from 0.0049 to 0.0004 as the generations progressed. In comparison with the fourth generation, the mortality and developmental time of the 39th generation were generally greater, and the adult body sizes were generally smaller. The estimated low developmental threshold temperatures of eggs, male larvae to male adults, and female larvae to female adults were 9.6, 11.3, and 9.7°C, respectively. The optimal rearing temperature was determined to be 25°C. This is the first record of domesticated rearing of a wild chironomid species under laboratory conditions for >7 yr.
| Original language | English |
|---|---|
| Pages (from-to) | 1406-1418 |
| Number of pages | 13 |
| Journal | Environmental Entomology |
| Volume | 43 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2014 |
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Keywords
- Chironomidae
- Glyptotendipes tokunagai
- Optimal rearing temperature
- Successive rearing
- Toxicity test species
ASJC Scopus subject areas
- Insect Science
- Ecology, Evolution, Behavior and Systematics
- Ecology
Cite this
Biological and genetic characteristics of Glyptotendipes tokunagai (Diptera : Chironomidae) on the basis of successive rearing of forty-two generations over seven years under laboratory conditions. / Baek, Min Jeong; Yoon, Tae Joong; Kang, Hyo Jeong; Bae, Yeon Jae.
In: Environmental Entomology, Vol. 43, No. 5, 2014, p. 1406-1418.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Biological and genetic characteristics of Glyptotendipes tokunagai (Diptera
T2 - Chironomidae) on the basis of successive rearing of forty-two generations over seven years under laboratory conditions
AU - Baek, Min Jeong
AU - Yoon, Tae Joong
AU - Kang, Hyo Jeong
AU - Bae, Yeon Jae
PY - 2014
Y1 - 2014
N2 - Members of the nonbiting midge family Chironomidae have been used worldwide as water-quality indicators or toxicity test organisms. The purpose of this study was to establish the chironomid Glyptotendipes tokunagai Sasa as a new test species by conducting successive rearing under laboratory conditions. We monitored biological and genetic aspects of >42 successive generations over 7 yr, and also compared the development of the 39th generation with the fourth generation under five constant temperatures of 15, 20, 25, 30, and 35°C. We observed that the number of eggs in an egg mass and the adult body sizes decreased rapidly in the early generations, and thereafter tended to stabilize from the fifth generation to the 42nd generation. In all generations, the mean hatching rate was >75%. Males were predominant in the early generations, but the sex ratio increased to 0.5 (ranged 0.240.61) in later generations. The genetic divergence of the reared generations, analyzed by using the mitochondrial cytochrome c oxidase subunit I gene, decreased from 0.0049 to 0.0004 as the generations progressed. In comparison with the fourth generation, the mortality and developmental time of the 39th generation were generally greater, and the adult body sizes were generally smaller. The estimated low developmental threshold temperatures of eggs, male larvae to male adults, and female larvae to female adults were 9.6, 11.3, and 9.7°C, respectively. The optimal rearing temperature was determined to be 25°C. This is the first record of domesticated rearing of a wild chironomid species under laboratory conditions for >7 yr.
AB - Members of the nonbiting midge family Chironomidae have been used worldwide as water-quality indicators or toxicity test organisms. The purpose of this study was to establish the chironomid Glyptotendipes tokunagai Sasa as a new test species by conducting successive rearing under laboratory conditions. We monitored biological and genetic aspects of >42 successive generations over 7 yr, and also compared the development of the 39th generation with the fourth generation under five constant temperatures of 15, 20, 25, 30, and 35°C. We observed that the number of eggs in an egg mass and the adult body sizes decreased rapidly in the early generations, and thereafter tended to stabilize from the fifth generation to the 42nd generation. In all generations, the mean hatching rate was >75%. Males were predominant in the early generations, but the sex ratio increased to 0.5 (ranged 0.240.61) in later generations. The genetic divergence of the reared generations, analyzed by using the mitochondrial cytochrome c oxidase subunit I gene, decreased from 0.0049 to 0.0004 as the generations progressed. In comparison with the fourth generation, the mortality and developmental time of the 39th generation were generally greater, and the adult body sizes were generally smaller. The estimated low developmental threshold temperatures of eggs, male larvae to male adults, and female larvae to female adults were 9.6, 11.3, and 9.7°C, respectively. The optimal rearing temperature was determined to be 25°C. This is the first record of domesticated rearing of a wild chironomid species under laboratory conditions for >7 yr.
KW - Chironomidae
KW - Glyptotendipes tokunagai
KW - Optimal rearing temperature
KW - Successive rearing
KW - Toxicity test species
UR - http://www.scopus.com/inward/record.url?scp=84923093096&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84923093096&partnerID=8YFLogxK
U2 - 10.1603/EN14052
DO - 10.1603/EN14052
M3 - Article
VL - 43
SP - 1406
EP - 1418
JO - Environmental Entomology
JF - Environmental Entomology
SN - 0046-225X
IS - 5
ER -