【摘要】 参照Giga的方法在28℃和33℃下研究玉米象与谷蠹的种内和种间竞争,结果表明单独饲养下玉米象与谷蠹的生殖曲线均为抛物线型,属于资源利用竞争型,种内竞争强度取决于初始虫口密度。玉米象与谷蠹混合饲养的种群数量均明显小于单独饲养的种群数量,两物种为争夺有限的资源产生竞争,种间竞争强度取决于初始虫口密度和温度条件。在28℃下玉米象生殖曲线为凸型,是强竞争者,将长期占据统治地位;在33℃下谷蠹的竞争能力增强,生殖曲线由28℃下的凹型转变为33℃下的凸型,将有可能占据决定地位,但玉米象在较高虫口密度下生殖曲线仍为凸型,竞争结果最终可能会导致两物种共存。更多还原

【Abstract】 Intraspecific and interspecific competition of Sitophilus zeamais and Rhizopertha dominica were studied at 28℃ and 33℃ according to the method of Giga in laboratory.The results showed that the reproductive curves of S.zeamais and R.dominica under single rearing condition were quadratic curves,and the competition types belonged to resource competition type.Hence the intensity of intraspecific competition was affected by initial density.Population numbers of S.zeamais and R.dominica under mixture rearing condition were less than those of single rearing condition,there was remarkable competition between the two species for limited resources,and the intensity of interspecific competition was affected by initial density and temperature.The S.zeamais with convex reproduction curve was stronger competitor and would be the dominant species for a long period at 28℃;the competition ability of R.dominica became stronger at 33℃ than that at 28℃,the reproduction curve changed from concave at 28℃ to convex at 33℃,it would be the dominant species,but the reproduction curve of S.zeamais was also convex at higher density,so that co-existence was possible finally.更多还原