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首页> 外文期刊>Oecologia >Parasites boost productivity: effects of mistletoe on litterfall dynamics in a temperate Australian forest
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Parasites boost productivity: effects of mistletoe on litterfall dynamics in a temperate Australian forest

机译：寄生虫提高生产力：槲寄生对温带澳大利亚森林凋落物动态的影响

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摘要

The importance of litter in regulating ecosystem processes has long been recognised, with a growing appreciation of the differential contribution of various functional plant groups. Despite the ubiquity of mistletoes in terrestrial ecosystems and their prominence in ecological studies, they are one group that have been overlooked in litter research. This study evaluated the litter contribution from a hemiparasitic mistletoe, Amyema miquelii (Lehm. ex Miq.) Tiegh., in an open eucalypt forest (Eucalyptus blakelyi, E. dwyeri and E. dealbata), at three scales; the forest stand, single trees and individual mistletoes. Litter from mistletoes significantly increased overall litterfall by up to 189%, the amount of mistletoe litter being proportional to the mistletoe biomass in the canopy. The high litter input was due to a much higher rate of mistletoe leaf turnover than that of host trees; the host litterfall and rate of leaf turnover was not significantly affected by mistletoe presence. The additional litter from mistletoes also affected the spatial and temporal distribution of litterfall due to the patchy distribution of mistletoes and their prolonged period of high litterfall. Associated with these changes in litterfall was an increase in ground litter mass and plant productivity, which reflects similar findings with root-parasitic plants. These findings represent novel mechanisms underlying the role of mistletoes as keystone resources and provide further evidence of the importance of parasites in affecting trophic dynamics.
机译：人们早已认识到凋落物在调节生态系统过程中的重要性，并逐渐意识到各种功能性植物群的不同贡献。尽管在生态系统中无处不在的槲寄生及其在生态学研究中的突出地位，但它们仍是凋落物研究中被忽视的一群。这项研究以三个尺度评估了半开放性桉树森林（Eucalyptus blakelyi，E。dwyeri和E. Dealbata）中的半寄生槲寄生（Amyema miquelii（Lehm。ex Miq。）Tiegh。）的凋落物贡献。森林林地，单棵树和单个槲寄生。槲寄生的凋落物使总体凋落物显着增加高达189％，槲寄生凋落物的量与冠层中的槲寄生生物量成正比。凋落物的大量输入是由于槲寄生叶片周转率比寄主树高得多。槲寄生的存在不会显着影响寄主凋落物和叶片周转率。杂草丛生的额外凋落物也影响了凋落物的时空分布，这是由于杂草丛草的斑片状分布及其长期的高凋落物时期所致。与凋落物的这些变化相关的是地面凋落物质量和植物生产力的增加，这反映了与根寄生植物相似的发现。这些发现代表了槲寄生作为基石资源的作用的新机制，并进一步证明了寄生虫在影响营养动力学方面的重要性。

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