2012年11月
Stage-specific mortality, fecundity, and population changes in Cassida rubiginosa (Coleoptera: Chrysomelidae) on wild thistle
APPLIED ENTOMOLOGY AND ZOOLOGY
- ,
- ,
- 巻
- 47
- 号
- 4
- 開始ページ
- 457
- 終了ページ
- 465
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1007/s13355-012-0143-5
- 出版者・発行元
- SPRINGER JAPAN KK
Cassida rubiginosa Muller (Coleoptera: Chrysomelidae), one of the most conspicuous defoliators of thistle weeds, is capable of severely damaging thistle leaves; however, populations rarely reach sufficient density for effective thistle control under natural conditions. To investigate the impact of natural mortality factors on C. rubiginosa populations, life table studies were conducted between 1996 and 1998 in Kanazawa, Japan. Egg mortality, mortality in early larvae, and lost fertility contributed strongly to total generational mortality in every year studied. Egg mortality was primarily attributable to parasitism by wasps of the genus Anaphes, and the impact of predation and egg inviability was small. Mortality factors that affected the larval and pupal stages were largely unknown. Under field conditions, females only realized approximately 8.1-13.7 % of their potential fecundity, varying from 36.0 to 61.4 eggs per individual. Since annual changes in lost fertility exhibited a similar pattern to those in generational mortality, fertility loss might be the key factor driving C. rubiginosa populations. These results suggest that reproduction is the most important process that determines the level and fluctuation of the C. rubiginosa population.
- リンク情報
- ID情報
-
- DOI : 10.1007/s13355-012-0143-5
- ISSN : 0003-6862
- Web of Science ID : WOS:000310610400020