全文获取类型
收费全文 | 104篇 |
免费 | 1篇 |
国内免费 | 5篇 |
出版年
2021年 | 1篇 |
2015年 | 3篇 |
2014年 | 2篇 |
2013年 | 3篇 |
2012年 | 3篇 |
2011年 | 3篇 |
2010年 | 3篇 |
2009年 | 3篇 |
2008年 | 13篇 |
2007年 | 8篇 |
2006年 | 5篇 |
2005年 | 5篇 |
2004年 | 4篇 |
2002年 | 4篇 |
2001年 | 4篇 |
2000年 | 9篇 |
1999年 | 5篇 |
1998年 | 4篇 |
1997年 | 5篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 5篇 |
1987年 | 4篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
排序方式: 共有110条查询结果,搜索用时 31 毫秒
61.
62.
63.
Laboratory experiments were conducted to examine the role of the egg stalk in host discrimination by Ooencyrtus nezarae Ishii (Hymenoptera: Encyrtidae), an egg parasitoid of the bean bug, Riptortus clavatus Thunberg (Hemiptera: Alydidae). These experiments showed that females that have oviposited in unparasitized hosts within 1 h before the test discriminated between parasitized and unparasitized hosts. When protruding parts of the parasitoid's egg stalks were removed from hosts, the latter were accepted by experienced females. This suggests that the protruding portion of the parasitoid egg stalk functions as an external marker. This part of the egg stalk was responsible for host discrimination up to 8 days after parasitism. Internal discrimination was also observed on hosts 3 or 8 days after parasitism.
Résumé Des expériences de laboratoire ont permis d'examiner l'influence du pédoncule de l'oeuf dans la sélection des hôtes par O. nezarae Ishii (Hym.: Encyrtidae), parasite d'oeufs de Riptortus clavatus Thunberg (Hemip.: Alydidae). Les femelles qui avaient pondu dans un hôte vierge dans l'heure qui avait précédé l'expérience ont été capables de choisir entre des hôtes parasités ou non. Quand la partie saillante du pédoncule de l'oeuf de parasitoïde avait été extraite de l'hôte, ce dernier avait été accepté par les femelles. Ceci laisse supposer que la partie saillante du pédoncule de l'oeuf fonctionne comme marqueur externe. Cette partie du pédoncule de l'oeuf a été responsable de la discrimination des hôtes jusqu'à 8 jours après qu'ils aient été parasités, montrant une plus longue efficacité comme marqueur externe que les phéromones externes observées chez d'autres parasitoïdes.相似文献
64.
Yan-Zhou Zhang Sheng-li Si Jin-Tu Zheng Hong-Liang Li Yu Fang Chao-Dong Zhu Alfried P. Vogler 《Biological Control》2011,58(3):182-191
The genus Anicetus includes economically important biocontrol agents that are introduced for control of soft and wax scale insect agricultural pests (Ceroplastes spp.). Understanding of host–parasitoid associations is critical to the successful outcome of their utilization in biological control projects. However, identification of these parasitoids is often difficult because of their small size and generally similar morphological features, and hence, studies on the host–parasitoid associations. Here, nucleotide sequence data were generated from the mitochondrial COI gene and the D2 region of 28S rRNA to assess genetic variation within and between species of Anicetus occurring in China. The results of this study support the use of the COI and the D2 region of 28S rRNA gene as useful markers in separating species of Anicetus, even in cases where morphological differences are subtle. On the other hand, the COI gene is also useful in recognizing species with much variation in morphology. DNA barcoding reveals high levels of host specificity of endoparasitoids wasps in the genus Anicetus. Our results indicate that each Anicetus species is adapted to a limited set of host species, or even are monospecific in their host choice. 相似文献
65.
66.
Riziero Tiberi Matteo Bracalini Francesco Croci Guido Tellini Florenzano Tiziana Panzavolta 《Ecology and evolution》2015,5(22):5372-5382
Climate change may be affecting the fecundity of phytophagous insects as well as impacting their natural enemies. However, temperature impacts these two insect groups differently, disrupting population regulation mechanisms, and ultimately, possibly culminating in an outbreak of the host. The pine processionary moth (PPM) is one of the most harmful insects of the Mediterranean basin. Not only are PPM larvae harmful to plants, but they are also dangerous to humans because of their urticating hairs. Although some information is available on climate change effects on the PPM, little is known about its potential effects on PPM egg parasitoids, especially on their distribution range or on their role in controlling PPM populations. The aim of this article was to verify the effects of climate on PPM fecundity and on its egg parasitoids. Our results show that climate warming may affect the PPM positively, but not its egg parasitoids. Specifically, during our study mild winters directly favored the PPM, while increasing summer temperatures (over 30°C) also favored the PPM indirectly, by decreasing parasitism rates. We predict that ever‐milder winters will not only favor PPM development, but also encourage it to spread in otherwise previously inhospitable environments. 相似文献
67.
Jana Collatz Andrea Fuhrmann Philipp Selzer Rainer M. Oehme Kathrin Hartelt Peter Kimmig Torsten Meiners Ute Mackenstedt Johannes L.M. Steidle 《Entomologia Experimentalis et Applicata》2010,134(2):131-137
The parasitic wasp Ixodiphagus hookeri Howard (Hymenoptera: Encyrtidae) parasitizes larvae and nymphs of a number of tick species worldwide. Ticks themselves are parasitic on vertebrate hosts. To study the specificity and reliability of vertebrate odours used by I. hookeri for host location, we conducted bioassays in a four‐chamber olfactometer. Wasps were arrested by carbon dioxide and by odours from roe deer faeces and odours from hair of roe deer and wild boar. Odours from faeces of cattle, rabbit, and field mouse as well as odours from hair of cattle and field mouse had no effect. Odours from faeces of the host tick species Ixodes ricinus L. (Acari: Ixodidae) were attractive only up to a distance of 1 cm. Thus, I. hookeri reacts to general (carbon dioxide) and specific vertebrate odours from wild boar and deer. Examination of freshly shot specimens demonstrates that deer and wild boars are infested with a sufficient number of tick nymphs to tap the full reproductive potential of an I. hookeri female, which makes cues from these mammal species reliable. These results indicate that I. hookeri locates its hosts using specific and reliable mammal odours and that ticks are parasitized on their vertebrate hosts. The implications of this host‐finding strategy and its benefits for the parasitoid are discussed. 相似文献
68.
记述采自辽宁省草河口的缺缘跳小蜂属1新种:黑褐缺缘跳小蜂Cowperia subnigraLi,sp.nov.。本新种与其近缘种C.areolata(Walker,1872)的区别在于其额顶与头宽之比为1:2.53;单眼呈直角三角形排列;梗节长于第1索节;腹部卵圆形,尾须板约位于腹基部1/3处等特征。模式标本保存于东北林业大学昆虫标本室。 相似文献
69.
记述采自中国东北地区的阔柄跳小蜂属1新种及2中国新记录种。新种长索阔柄跳小蜂Metaphycus longifuniculus,sp.nov.育自辽宁省普兰店槲栎Quercus alien上的栎绛蚧Kermes sp.;纯黄阔柄跳小蜂Metaphycusalbopleuralis(Ashmead)育自黑龙江省哈尔滨市糖戚盔蚧Parthenolecaniumcorni(Bouche)、槐花球蚧Eulecanium kuwanai(Kanda)和吉林省长春市榆树上的1种蚧虫;软蚧阔柄跳小蜂Metaphycus insidiosus(Mercet)育自黑龙江省尚志市刺五加上的1种软蚧。模式标本保存于东北林业大学昆虫标本室。 相似文献
70.
We examined interspecific competition between the egg-larval polyembryonic parasitoid Copidosoma floridanum (Hymenoptera: Encyrtidae) and the gregarious larval endoparasitoid Glyptapanteles pallipes (Hymenoptera: Braconidae). Approximately 72% of multiparasitized Acanthoplusia agnata (Lepidoptera: Noctuidae) produced C. floridanum adults, 14% produced G. pallipes adults, and 14% died without producing any parasitoids. Development was delayed and the rate of weight gain was reduced in multiparasitized hosts that produced C. floridanum compared with singly-parasitized hosts. In contrast, only weight was reduced in multiparasitized hosts that produced G. pallipes adults. Compared with single parasitism, the brood size of wasps emerging from multiparasitized hosts was reduced in both species. The percentage of hosts containing precocious larvae of C. floridanum, which are considered to be soldiers, did not increase in response to parasitization by G. pallipes. However, developmental cessation and death of G. pallipes eggs and larvae may be closely related to the number of coexisting precocious larvae. 相似文献