【作者】 张晶；

【导师】 王淑霞； 李后魂；

【作者基本信息】 南开大学 ， 动物学， 2012， 博士

【摘要】 头细蛾属Epicephala昆虫与叶下珠族Phyllantheae植物之间存在着不同类型的协同进化关系。在长期的协同进化历程中，不同寄主与头细蛾之间形成了不同的机制来维持互利共生体系中利益的平衡，以保证系统的稳定。本文通过研究分布于海南和福建的头细蛾属昆虫及相关黑面神属Breynia和算盘子属Glochidion植物的协同进化关系，发现头细蛾属昆虫与叶下珠族植物之间既存在着1对1的专一性协同进化关系，又存在1对2及2对2的发散型协同进化关系。通过对头细蛾属成虫和幼虫的形态特征、访花行为和生物学特性及相关寄主的花部形态特征、开花物候和种子产量等方面的调查和研究，探讨了不同模式下头细蛾与寄主之间的协同进化关系及其稳定机制。本文主要包括以下三方面：（1）记述头细蛾昆虫4新种（已发表）：寄生黑面神属植物的宽瓣头细蛾Epicephala lativalvaris Li, Wang et Zhang,2012，奇瓣头细蛾E. mirivalvaris Li,Wang et Zhang,2012和小叶头细蛾E. vitisidaea Li, Wang et Zhang,2012，以及寄生毛果算盘子Glochidion eriocarpum的毛果头细蛾Epicephala eriocarpa Li, Wanget Zhang,2012，给出了成虫和雌雄外生殖器特征图及分布；解剖并详细描述了头细蛾属14种老熟幼虫的头部和体节的毛序特征，提供了毛序特征图，给出了分种检索表，比较了不同寄主上头细蛾幼虫之间的差异。（2）通过对分布于海南和福建的头细蛾属昆虫及相关寄主植物的研究，发现小叶头细蛾E. vitisidaea与小叶黑面神B. vitis-idaea之间存在1对1的专一性协同进化关系；宽瓣头细蛾E. lativalvaris和奇瓣头细蛾E. mirivalvaris与黑面神B. fruticosa和喙果黑面神B. rostrata之间存在2对2的发散型协同进化关系；双向头细蛾E. bipollenella与香港算盘子G. zeylanicum和厚叶算盘子G. hirsutum之间存在1对2的发散型协同进化关系。在小叶头细蛾——小叶黑面神协同进化关系中，小叶黑面神的花粉和柱头均被萼片包围的特殊结构导致除头细蛾之外的其他访花昆虫无法为其传粉；雄花开放时间与小叶头细蛾的活动时间相协调及小叶黑面神和小叶头细蛾生活周期一致，保证了传粉昆虫的专一性；小叶头细蛾的羽化高峰长于小叶黑面神的盛花期、小叶头细蛾的主动采粉行为及高效率的传粉保证了小叶黑面神子房的发育率。小叶黑面神通过果实基部果梗的有无调控小叶头细蛾幼虫的成活率，而小叶头细蛾幼虫只取食部分种子保证了小叶黑面神有足够完好的种子维持种群大小。在宽瓣头细蛾和奇瓣头细蛾——黑面神和喙果黑面神发散型协同进化关系中，两种头细蛾共同并主动地为两种黑面神植物传粉，幼虫均需消耗果实内全部的种子才能发育成熟，但在整个种群内会有一部分完好的果实留下以保证植物的繁殖。头细蛾与植物的生活周期不但高度协调，而且黑面神在海南和福建两地不同的开花物候导致了两地头细蛾生活史的不同。两种头细蛾互为竞争关系，奇瓣头细蛾的种群大小远不及宽瓣头细蛾的种群大小。文中探讨了两种黑面神植物产生的自然杂交个体与其共享头细蛾传粉的关系。在双向头细蛾——香港算盘子和厚叶算盘子发散型协同进化关系中，双向头细蛾的生活史与两种算盘子的开花物候相协调，活动时间与开花时间一致。香港算盘子的结实率和双向头细蛾寄生率均高于厚叶算盘子，但厚叶算盘子单个果实中的完好种子多于香港算盘子，维持了两种植物种群大小的平衡。（3）根据20种头细蛾属昆虫的CO1基因序列和22种叶下珠族植物的matK基因序列，分析探讨了头细蛾属昆虫和叶下珠族黑面神属、算盘子属及叶下珠属植物之间的协同进化历程。更多还原

【Abstract】 Different coevolution mutualisms exist between Epicephala moths andPhyllantheae plants. In the long course of coevolution, various kinds of mechanismshave been developed to maintain the balance of interest and the stabilization of themutualism between them. The present dissertation focuses on the study of theEpicephala moths associated with Glochidion and Breynia plants in Hainan andFujian. The results showed that “one-to-two” and “two-to-two” diffuse coevolutionsalso exist in the Epicephala—Phyllantheae mutualisms except “one-to-one” specificcoevolution. Based on the morphological characters, the flower-visiting behavior andthe biological characters of the Epicephala adults and larvae, as well as themorphological characters of flowers, the phenology and the seed production of theassociated hosts, we discussed the different coevolution models between theEpicephala moths and the corresponding hosts, and the mechanisms to keep theirstability. This dissertation consists of the following three aspects:(1) Four new species of the genus Epicephala are described and illustrated, ofwhich E. lativalvaris Li, Wang et Zhang,2012, E. mirivalvaris Li, Wang et Zhang,2012and E. vitisidaea Li, Wang et Zhang,2012parasitized on Breynia plants, and E.eriocarpa Li, Wang et Zhang,2012parasitized on Glochidion eriocarpum. TheEpicephala mature larvae of14species are dissected; the head and body chaetotaxy ofthe mature larvae are described in detail and illustrated, along with a key for theidentification of these larvae; and the differences among the Epicephala mature larvaeon different hosts are compared.(2) Based on the study of the Epicephala moths and the related hosts in Hainanand Fujian, we found “one-to-one” specific coevolution between E. vitisidaea and B.vitis-idaea;“two-to-two” diffuse coevolution between two Epicephala moths species(E. lativalvaris and E. mirivalvaris) and two of Breynia plant species (B. fruticosa andB. rostrata), and “one-to-two”diffuse coevolution between E. bipollenella and twoGlochidion plant species (G. zeylanicum and G. hirsutum).In E. vitisidaea—B. vitis-idaea coevolution system, the special characters of bothpollen grains and stigma concealed in the sepal lobes made other pollinators unable topollinate B. vitis-idaea flowers except Epicephala moths; the flower-visiting time of E.vitisidaea coincides with the blossom of two B. vitis-idaea male flowers, and the lifehistory of E. vitisidaea coincides with the phenology of B. vitis-idaea ensured thespecifity of pollinators; the peak emergence of E. vitisidaea is longer than theblooming period of B. vitis-idaea, and the active and high efficiency of pollinationensured the development of ovaries. Breynia vitis-idaea controled the survival rate ofE. vitisidaea larvae by the presence or absence of the basal stalk, and the E. vitisidaealarvae consumed a portion of seeds so that Breynia vitis-idaea would have enoughintact seeds left to maintain the population size. In Epicephala—Breynia diffuse coevolution system, the two Epicephala mothsspecies jointly and actively pollinated the two Breynia species, and a singleEpicephala larva could develop to maturity by consuming all six seeds of each fruit,whereas a fraction of intact fruits were left to ensure the reproduction of the plantswithin the whole population. The life history of Epicephala species highly coincideswith the phenology of Breynia plants, and the different phenology of B. fruticosaresulted in different life history of the two Epicephala species in Hainan and Fujian.The two Epicephala species are competitive for resources, and the population of E.mirivalvaris is much smaller than that of E. lativalvaris. The natural hybridization ofthe two host plants, possibly induced by sharing pollination of Epicephala moths, isbriefly discussed.In Epicephala—Glochidion diffuse coevolution system, the life history of E.bipollenella coincides with the phenology of the two Glochidion plant species, and theflower-visiting time of E. bipollenella highly coincides with the blossom of the twoGlochidion flowers. The seed setting rate of G. zeylanicum and the parasitic rate of E.bipollenella are higher than those of G. hirsutum, but G. hirsutum possesses moreintact seeds per fruit than G. zeylanicum, which maintained the balance of the twoGlochidion species population.(3) Based on CO1genes of20Epicephala species and matK genes of22Phyllantheae species, we discussed the coevolution process of Epicephala andPhyllantheae (Breynia, Glochidion and Phyllanthus).更多还原