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【目的】研究外来入侵物种西花蓟马与本地物种烟蓟马的种间竞争。【方法】在实验室条件下,将西花蓟马与烟蓟马的紫甘蓝种群作为研究对象,以不同的种群数量混合或单独饲养,繁殖1代或多代后检查并比较2种蓟马的产卵数量、种群数量及后代性比的变化情况,分析2种蓟马的种群增长竞争和生殖能力竞争。【结果】当烟蓟马与西花蓟马个体数分别以40﹕20、30﹕30、20﹕40的种群比例在紫甘蓝上共存竞争时,西花蓟马分别在4代、4代和5代后被烟蓟马完全取代,并且在竞争过程中伴随着西花蓟马种群雌虫比例的逐代下降。生殖能力竞争的结果表明烟蓟马可以显著降低西花蓟马的产卵量和后代的雌雄比例。当1对西花蓟马分别与1、2、3头烟蓟马雌虫共存时,西花蓟马的日均产卵量由5.7粒分别下降到2.6、1.9和0.8粒;1头西花蓟马雌虫分别与1、2、3头烟蓟马雌虫共存时,西花蓟马的日均产卵量由7.6粒分别下降到3.6、2.5和1.4粒;而当1对西花蓟马分别与3头和5头烟蓟马雌虫共存时,西花蓟马后代的雌雄比例由3.1分别下降到2.4和1.3。【结论】在以紫甘蓝为寄主植物的竞争体系中,烟蓟马试验种群在短时间内取代了西花蓟马试验种群。烟蓟马除自身具有更强的繁殖力,其对西花蓟马生殖的抑制作用也是产生这一现象的重要原因。
【Objective】 The objective of this study was to study the interspecific competition between the invasive alien species West-thrips tabaci and the native species Thrips tabaci. 【Method】 Under laboratory conditions, the populations of Lypyllis thrips and Thrips tabaci were studied. The populations of Lysimachiae viola and Thrips tabaci were mixed with or separately fed, and were examined one generation or more after breeding and compared with two species of thrips The number of spawning population, the number of the population and the ratio of progeny to progeny were analyzed. The population growth competition and reproductive capacity competition of two species of thrips were analyzed. 【Result】 The results showed that when the individuals of Thrips tabaci and F. occidentalis compete with each other in the population of 40:20, 30:30 and 20:40 respectively, After 5 generations, it was completely replaced by Thrips tabaci and was accompanied by a gradual decrease in the proportion of female Thrips tabaci populations during the competition. The results of competition for reproductive capacity show that Thrips tabaci can significantly reduce the fecundity of the western flower thrips and the proportion of the male and the female of the offspring. When one pair of western flower thrips coexisted with one, two thirteen thrips thirteen females, the average daily fecundity of western flower thrips decreased from 5.7 to 2.6, 1.9 and 0.8 respectively. Thrips female and 1, 2 and 3 thrips female co-exist, the average daily fecundity of western flower thrips from 7.6 to 3.6,2.5 and 1.4, respectively; and when a pair of West flower thistle When the horses coexisted with 3 and 5 Thrips tabaci respectively, the proportion of male and female of F. thrips decreased from 3.1 to 2.4 and 1.3, respectively. 【Conclusion】 In the competitive system with purple cabbage as host plant, the test population of Thrips testi replaces the tested population of F. occidentalis in a short period of time. Thrips tabaci, in addition to its own more fertility, its inhibitory effect on western flower thrips reproduction is also an important reason for this phenomenon.