Bark thickness of host pine trees and female body size affecting ovipositional success ofSirex nitobei matsumura (hymenoptera: Siricidae)     

Hideshi Fukuda  Naoki Hijii 《Journal of Forest Research》1998,3(3):185-186

We examined the effect of bark thickness of host trees on the ovipositional success ofSirex nitobei in relation to female body size by analyzing the relationships between female body-weight and ovipositor length and between bark thickness ofP. densiflora andP. thunbergii trees and oviposition proportion (the proportion of eggs laid to the potential female lifetime fecundity) of the woodwasp. The ovipositor length ranged from 6 to 14 mm and was correlated positively with the fresh body-weight of females. The bark thickness of host trees had no significant correlation with the oviposition proportion of large females of more than 100 mg f.wt, whereas it was correlated negatively with that of small females of less than 100 mg f.wt. Thus,P. densiflora, which has thinner bark as a whole thanP. thunbergii, may be more suitable for oviposition, especially for smaller females. Research Fellow of the Japan Society for the Promotion of Science. This study was supported in part by a Grant-in-Aid for Scientific Research from the Japanese Ministry of Education, Science, Sports, and Culture (No. 80003292).  相似文献   

Genetic variation in resistance of the tiger pufferfish Takifugu rubripes to a host-specific monogenean parasite Heterobothrium okamotoi     

Kim  Dong In  Hosoya  Sho  Mizuno  Naoki  Ito  Kotaro  Ieda  Risa  Kikuchi  Kiyoshi 《Fisheries Science》2019,85(6):1019-1025

Fisheries Science - The tiger pufferfish Takifugu rubripes is one of the most valuable aquaculture species in Japan. In this study, we investigated the genetic variation in resistance to...  相似文献   

Cloning and nutritional regulation of polyunsaturated fatty acid desaturase and elongase of a marine teleost,the nibe croaker <Emphasis Type="Italic">Nibea mitsukurii</Emphasis>     

Yoji Yamamoto  Naoki Kabeya  Yutaka Takeuchi  Alimuddin  Yutaka Haga  Shuichi Satoh  Toshio Takeuchi  Goro Yoshizaki 《Fisheries Science》2010,76(3):463-472

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Repeatable immersion infection with <Emphasis Type="Italic">Photobacterium damselae</Emphasis> subsp. <Emphasis Type="Italic">piscicida</Emphasis> reproducing clinical signs and moderate mortality     

Ichiro?Nagano  Seiko?Inoue  Kenji?Kawai  Syun-ichirou?OshimaEmail author 《Fisheries Science》2009,75(3):707-714

Pseudotuberculosis is a bacterial septicaemia caused by Photobacterium damselae subsp. piscicida in several marine fish species. Yellowtail Seriola quinqueradiata is the most sensitive fish species to this disease. The internal organs of naturally infected yellowtail exhibit whitish spots, tubercle-like tissue structures, consisting of bacterial accumulations. There have been many trials for experimental infection, however adequate method of infection that reproduces moderate mortality and primary clinical signs has not yet established. Present investigation evaluated an immersion infection method by using logarithmic culture-phase bacteria resulting in higher mortality than that using stationary culture-phase bacteria. Typical white spots on the spleen and kidney were also observed constantly in dead fish. Transmission electron microscopy and fluorescent antibody microscopy showed bacterial clusters not only in the spleen and kidney but also in the blood channels in the secondary gill filaments. These results were confirmed repeatedly by plural experiments. The use of logarithmic-phase bacteria in immersion infection is an appropriate technique to reproduce moderate mortality and primary clinical signs, which will be a reliable infection method also for the challenge test of pseudotuberculosis vaccine.  相似文献