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EkaterinaKONDRATYUK EkaterinaLITVINOVA EugeneNOVIKOV DmitryPETROVSKI IreneKOLOSOVA MikhailMOSHKIN 《动物学报》2004,50(5):714-722
作者研究了胸腺依赖抗原 (SRBC) (羊红血细胞 ,sheepredbloodcells ,SRBC)和非胸腺依赖抗原 (细菌脂多糖 ,lipopolysaccharide ,LPS)的免疫活化对黑线毛足鼠气味信号和内分泌状态的影响。成年雄鼠注射SRBS5天后 ,其气味的性吸引力下降 ,这种结果伴随着粪便中睾酮含量的下降。SRBC处理后 ,雄性气味吸引力降低 ,这在体液免疫反应低的雄性个体中最明显。与SRBC的作用相反 ,注射LPS的雄性个体的气味吸引力增加 ,成熟雌性个体用于嗅闻嗅觉刺激上的时间差异与经LPS和盐处理过的雄鼠的粪便中睾酮浓度的差异呈正相关。作者讨论了这两种相反的嗅觉效应的适应性意义 相似文献
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我孩子现在4岁,每个星期都要去两三次动物园。很多孩子都是这样,动物园对他们来说具有非凡的吸引力,因此其教育作用不可低估。包括我自己,还有不少从事动物以及相关方面研究的学者和活动家,喜欢动物、关心动物、研究动物,最初都是从动物园开始的。可以说,动物园是我们启蒙的地方,如今我们又把所学的知识应用在动物园的动物身上。从这个意义上说,动物园的教育作用是不可取代的。 相似文献
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Recent studies have revealed that sexually selected traits may signal sperm quality and hence male fertilisation ability. There is also evidence that the expression of male sexual ornamentation and associated sperm characteristics depend on an indi- vidual's ability to cope with oxidative stress. Carotenoids are known for their antioxidant properties and carotenoid-based orna- ments might represent honest signals as these pigments can be traded offbetween the investment in sexual ornamentation, sperm function as well as immune response. In this study, we examined the relationship between sexual ornamentation (breeding colo- ration) and sperm characteristics (e.g., velocity and morphology) in the three-spined stickleback Gasterosteus aeuleatus, an ex- ternally fertilising fish species, in which sperm competition commonly occurs. During the breeding season males are sperm limi- ted and develop a conspicuous carotenoid-based coloration, which is under strong pre-copulatory sexual selection due to female mate choice and male-male competition. The results of the present study show that the expression of stickleback male breeding coloration is significantly positively associated with the linearity of sperm movement, whereas sperm morphology (head length to tail length ratio) is significantly negatively related to the trajectory of sperm movement. Moreover, there is some support for the phenotype-linked fertility hypothesis as the intensity of male red breeding coloration is significantly positively correlated with sperm velocity, which is supposed to be an important determinant of fertilisation success in external fertilisers, indicating the honesty of the sexually selected nuptial red coloration. 相似文献
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