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博文

【论文】潜叶昆虫的种内竞争与密度效应

已有 3336 次阅读 2018-4-21 14:12 |个人分类:My Work 我的研究|系统分类:论文交流| 潜叶昆虫, leaf-mining, insects, 种群生态学, population

历经2013-2016四年调查统计,其中受到天气的重大影响,投稿三个期刊,文章终于总算见刊了,不容易啊。但我们还会年复一年的调查下去。


Dai X*, Xu J, Guo Q, Lai S, Liu P, Fan J, Tang P. Density effect and intraspecific competition in a leaf-mining moth on bamboo leaves. Journal of Forestry Research, 2018. 

https://link.springer.com/article/10.1007%2Fs11676-018-0655-0


Abstract

When confined to a single leaf, the larvae of most leafminers should suffer intense intraspecific competition. The survival and performance of individuals are expected to decline with increasing larval density within a leaf, showing a negative density-dependent effect. The maximum density of an Elachista Treitschke (Lepidoptera: Elachistidae) miner on Indocalamus tessellatus (Munro) Keng f. (Poaceae: Bambusoideae) under natural conditions can be greater than 40 per leaf, making this a good system for studying intraspecific competition and density effects. We counted the number of leaves with different mine densities in the field and found a clumped distribution of leafminer larvae among host leaves. The emergence rates of pupae (and last-instar larvae), adults and parasitoids were inversely correlated with larval density. Pupal weight and adult weight also showed negative relationships with larval density. However, pairwise tests showed that there might be no differences in pupal or adult weight at larval densities of 1–10 mines per leaf, indicating that density-dependent effects are more obvious at densities greater than 10 mines per leaf. Intraspecific competition could lead to stable density and consistent body size in surviving individual insects, which would help maintain a sustainable population size. The density threshold could be an indicator of the balance between intraspecific competitive detriments and conspecific aggregation benefits; however, the validity of the threshold density hypothesis requires further testing and confirmation.


Keywords

Leafminer Density-dependent Distribution pattern Sustainable population Threshold density 




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