Effects of Periodically Repeated Heat Events on Reproduction and Ovary Development of Agasicles hygrophila (Coleoptera: Chrysomelidae).
Insect development occurs within a specific temperature range. Constant temperature studies may produce misleading information on the eco-physiological impacts of temperature on the population dynamics of an insect species, as in most natural environments, temperature usually undergoes daily variation. In China, field surveys showed that the decline in the Agasicles hygrophila (Selman & Vogt) (Coleoptera: Chrysomelidae) population from early August to late September in summer resulted in difficulties in effectively controlling the population of Alternanthera philoxeroides (Mart.) Griseb (Amaranthaceae). Previous studies have largely ignored more natural, fluctuating conditions. In our study, we first investigated the impacts of different temperature conditions (25°C constant temperature for 20 h with a 4-h period of a high temperature of either 30°C, 33°C, 36°C, or 39°C) on adult reproduction and longevity, egg development time, egg hatch rate, female ovarian development, and oogenesis of A. hygrophila. Our results indicated that high temperatures of 30°C and 33°C did not affect the female ovarian development and oogenesis of A. hygrophila Contrarily, high temperatures of 36°C and 39°C negatively affected the population development of A. hygrophila. At 36°C and 39°C, the egg hatch rates were very low, and the egg development times significantly lengthened. The frequency of abnormal ovaries significantly rose at 39°C. We concluded that the decline in the A. hygrophila population during August and September may be related to the extreme high temperatures that frequently occur in summer. These results help provide a better understanding of A. hygrophila population dynamics under natural conditions.
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China (luyan5122@sina.com; yaowang1013@163.com; zs.zh@126.com; r.wang@cgiar.org; guojy406@163.com; wanfanghaocaas@163.com), guojy406@163.com.
Mei-Ting
MT
Zhao
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China (luyan5122@sina.com; yaowang1013@163.com; zs.zh@126.com; r.wang@cgiar.org; guojy406@163.com; wanfanghaocaas@163.com).
Yao
Y
Wang
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China (luyan5122@sina.com; yaowang1013@163.com; zs.zh@126.com; r.wang@cgiar.org; guojy406@163.com; wanfanghaocaas@163.com).
Zhong-Shi
ZS
Zhou
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China (luyan5122@sina.com; yaowang1013@163.com; zs.zh@126.com; r.wang@cgiar.org; guojy406@163.com; wanfanghaocaas@163.com).
Ren
R
Wang
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China (luyan5122@sina.com; yaowang1013@163.com; zs.zh@126.com; r.wang@cgiar.org; guojy406@163.com; wanfanghaocaas@163.com), guojy406@163.com.
Jian-Ying
JY
Guo
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China (luyan5122@sina.com; yaowang1013@163.com; zs.zh@126.com; r.wang@cgiar.org; guojy406@163.com; wanfanghaocaas@163.com), Qingdao Agricultural University, Qingdao, Shandong Province, China.
Fang-Hao
FH
Wan
D000818:Animals; D001517:Coleoptera / Q000254:growth & development / Q000502:physiology*; D005260:Female; D006358:Hot Temperature / Q000009:adverse effects*; D008136:Longevity; D008297:Male; D010053:Ovary / Q000254:growth & development; D010507:Periodicity; D011157:Population Dynamics; D012098:Reproduction
Agasicles hygrophila; daily high temperature; oogenesis; ovarian development