摘要
种内竞争是纵坑切梢小蠹重要的生态学特征．该蠹虫种内竞争主要表现为对繁殖场所的占领和划分．研究表明，小蠹虫种内竞争强度受其聚集强度和空间分布的影响．成虫聚集格局属于均匀分布．聚集密度从５０♂／ｍ２到２５０♀／ｍ２产卵量呈线性递减．幼虫之间的竞争往往导致虫体变小，甚至死亡．聚集密度、产卵量和幼虫存活率相互影响。
Intraspecific competition is one of the major ecological features of the pine shoot beetle, Tomicus piniperda (L.) (Col, Scolytidae). Competition of the bark beetle reflectes mainly the adults' occupying and plotting the reproduction site. The researches demostrated that, competive strength is greatly influenced by aggregation density and spatial distribution. On Yunnan pine, spatial distribution of the bark beetle was belong to even pattern. Numbers of eggs decreased linerly when aggregation density ranged from 50♂/m 2 to 250♂/m 2 . During the period of larval development,intraspecific competition resulted always in smaller bodies of larvae, even some larvae died in the shortage of food. Larval fatality rate increased from 20% to 80% with larval density from 1000/m 2 to 7000/m 2 . Aggregation density, reproduction and larval survival rate were integrated and composed as the mechanism of population regulation. Aggregation density ranged from 5♂/m 2 , the population increased withaggregation density more than 100♂/m 2 ,the population was stable.
出处
《云南大学学报（自然科学版）》
CAS
CSCD
1997年第4期388-392,共5页
Journal of Yunnan University(Natural Sciences Edition)
关键词
纵坑切梢小蠹
种群
种内竞争
松树害虫
Tomicus piniperda , population, intraspecific competition
