Effects of individual variation of host plants on the pattern of host selection in a phytophagous ladybird beetle species.
| Project/Area Number |
04640600
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
生態学
|
|---|
| Research Institution | Hokkaido University |
|---|
Principal Investigator |
KATAKURA Haruo Hokkaido University ; Faculty of Science ; Associate Professor, 理学部, 助教授 (40113542)
|
|---|
| Project Period (FY) |
1992 – 1993
|
| Project Status |
Completed (Fiscal Year 1993)
|
| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1993: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1992: ¥900,000 (Direct Cost: ¥900,000)
|
|---|
| Keywords | Phytophagous insects / Epilachna pustulosa / Host selcetion / Individual variation / Thistle / Blue cohosh / チシマアザミ / 被選好性 / 生存率 |
|---|
| Research Abstract |
Effects of individual variation and interspecific difference of plants on host selection by polyphagous phytophagous insects were studied using a ladybird beetle Epilachna pustulosa and its host plants thistle (Cirsium kamtschaticum) and blue cohosh (Caulophyllum robustum) in Sapporo, central Hokkaido. Through adult food choice tests and rearing of larvae using leaves from a number of individual plants, it was shown that thistle and blue cohosh constitute a continuous series of food resource for E.pustulosa and that the beetles select, irrespective of the plant species, the plants on which their larvae will perform well. However, the results obtained by laboratory experiments were contradictory to the patterns of host selction realized in the field ; the plants preferred in the laboratory were not always utilized in the field, and vice versa. Host selection by E.pustulosa is thus governed not only by the factors clarified in the laboratory but also by certain other factors whose effects are not yet clarified. Spatial distribution patterns and biomasses of host plants, habitat preference of beetles, and phenological correspondence between beetles and plants are possible candidates of such unknown factors. We also conducted preliminary host choice tests by E.pustulosa using thistles and blue cohosh collected in southern Hokkaido where E.niponica and E.yasutomii, closely related species to E.pustulosa but specialized to thistle and blue cohosh, respectively. In this case, too, E.pustulosa chose particular stocks irrespective of the plant species.
|
Report
(3 results)
Research Products
(10 results)
