Epigeic earthworms increase soil arthropod populations during first steps of decomposition of organic matter

Earthworms and soil arthropods are major groups involved in soil decomposition processes. Although the interaction between these organisms can influence decomposition rates, little is known about their population dynamics during the decomposition of organic matter. In this study, we used the pig manure decomposition process to evaluate the effects of the presence of the epigeic earthworm Eisenia fetida on seven groups of soil arthropods: springtails, astigmatid, prostigmatid, mesostigmatid and oribatid mites, psocids and spiders. We carried out an experiment in which low and high doses (1.5 and 3 kg, respectively) of pig manure were applied in consecutive layers to small-scale mesocosms with and without earthworms. The presence of E. fetida increased the overall number of soil arthropods regardless of the dose of manure applied. This result was mainly due to the presence of large populations of springtails and mesostigmatid mites. Springtails were more abundant in the new layers of the mesocosms, which indicated a preference for substrates with fresh organic matter and higher microbial biomass. The other arthropod groups were consistently favored by the presence of earthworms, but remained at low densities throughout the decomposition process. Only the psocids were negatively affected by the presence of E. fetida. These results suggest that the development of large populations of soil arthropods, mainly springtails, in the mesocosms with earthworms is a characteristic feature of the initial stages of the earthworm-driven decomposition process.     

中国虱属分类研究 Ⅴ.常见的几种仓储虱与植物检疫

本文是“中国虱属分类研究”系列论文的第5篇,首先对世界仓储虱常见种小眼虱LiposcelispaetaPearman进行了重新描述,并给出了5种常见虱检索表;其次对中国虱属已知种进行了总结;最后初步探讨了虱属研究在植物检疫标准化建设中的地位和意义。     

关于鲍氏虱(虫齿)和地虱(虫齿)的再描述

除危害各种储藏物 ,虱属昆虫也可随活体植物、木材、木质包装、废纸、土壤等进行远距离传播。为便于口岸检疫人员及时、准确鉴定所截获的虱属昆虫 ,本文记述了该属 2种中国新记录 ,即鲍氏虱liposcelisbouilloniBadonnel和地虱L .edaphicaLienhard ,并对其进行了再描述     

广东啮虫五新种(啮目:单啮科、叉啮科)

描述了广东省的啮虫五个新种,隶属于2科2属。