التفاصيل البيبلوغرافية
| العنوان: |
Dynamic feedbacks among tree functional traits, termite populations and deadwood turnover. |
| المؤلفون: |
Guo, Chao1,2 (AUTHOR), Tuo, Bin1,2 (AUTHOR), Ci, Hang1,2 (AUTHOR), Yan, En‐Rong1,2 (AUTHOR) eryan@des.ecnu.edu.cn, Cornelissen, Johannes H. C.3 (AUTHOR), Bartomeus, Ignasi (AUTHOR) |
| المصدر: |
Journal of Ecology. Apr2021, Vol. 109 Issue 4, p1578-1590. 13p. |
| مصطلحات موضوعية: |
*TERMITES, *WOOD quality, *FOOD animals, *PLANT species, *FOOD quality, *PSYCHOLOGICAL feedback, *FOOD preferences |
| مصطلحات جغرافية: |
CHINA |
| الملخص (بالإنجليزية): |
Changes in the composition of plant functional traits may affect ecosystem processes through influencing trophic interactions. Bottom‐up control by plant species through food availability to animals may vary with time. However, such dynamics and their consequences for deadwood turnover are poorly known for detrital food webs.We introduce a dynamic conceptual model of the feedback of tree functional traits, (deadwood‐feeding) termite populations and deadwood decomposition. We hypothesized that tree functional diversity (in terms of a wood resource economic spectrum [WES]) supports the sustenance of termite populations via complementary food supplied through time, as deadwood varies in traits both initially across species and because of different decomposition rates. Simultaneously, driven by this temporal dynamics of food quality, the consumption of deadwood by termites should hypothetically sustain deadwood turnover in a functionally diverse forest over time.We tested our hypothesis through an 18‐month termite‐exclusion decomposition experiment by incubating coarse (i.e. 5 cm diameter) deadwood of 34 woody species in two subtropical forests in East China. One site still sustained a healthy population of pangolins as the keystone termite predator, whereas another had lost its pangolins due to hunting and illegal wildlife trade.The results supported our hypothesis: in the first 12 months, termites amplified the positive linear relationship between % wood mass loss and initial wood quality (WES). In contrast, between 12 and 18 months, termite‐mediated consumption, and associated wood mass loss, showed a humpback relation with the initial WES. This shift in termite preference of deadwood species along the WES reflects complementary food availability to termites through time.Synthesis. Our findings imply that tree functional composition, with variation in deadwood quality through decomposition time, can help to sustain termite populations and thereby forest carbon turnover. Future studies need to test whether and how our conceptual model may apply to other detrital systems and food webs. In general, food web research would benefit from a stronger focus on temporal patterns for better understanding the interactions of basal resource functional traits and consumers on ecosystem functions. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
摘要: 植物功能性状成分的变化可通过影响营养级间的相互作用而对生态系统过程产生影响。植物通过上行效应来影响动物的食物资源可获得性, 且这种上行效应会随时间而变化。然而, 我们对碎屑食物网中这种动态的上行效应, 及其对木质残体分解的影响的理解尚非常有限。本研究提出了一个反映树木功能性状、白蚁种群和木质残体分解之间相互动态反馈的概念模型。我们假设, 由于木质残体初始性状和分解速率的种间差异, 根据木质经济型谱确定的树木功能多样性, 通过食物资源的互补性, 在不同分解时间为白蚁提供充足的食物供应, 从而维持白蚁种群。同时, 由于这种食物质量的时间动态驱动, 白蚁对木质残体的消耗维持了功能多样的森林中不同时间的木质残体周转。我们选择中国亚热带常绿阔叶林的两个样点, 利用34种木本植物的粗枝残体 (直径5厘米) 进行了为期18个月的白蚁排除分解实验, 来检验上述概念模型的科学假说。其中, 一个样点仍保留着白蚁的捕食者: 穿山甲, 而另一个样点由于狩猎和非法野生动物贸易行为, 穿山甲几近绝迹。研究结果支持以上科学假说, 即: 在分解前12个月, 白蚁消耗对木质残体质量损耗和木质经济型谱的正向线性关系具有放大效应。相比, 在分解12到18个月期间, 白蚁消耗的介导作用导致了木质残体质量损耗与木质经济型谱的驼背关系。白蚁取食偏好沿木质经济型谱的这种变化表明了食物资源的互补性在维持森林白蚁种群方面的重要性。本研究发现表明, 树木种间功能组成的不同, 介导了木质残体的基质质量随分解时间的变化, 从而可以帮助维持白蚁种群和森林碳周转。在未来的研究中, 仍需要检验我们的概念模型是否和如何适用于其他碎屑食物网。总之, 在食物网研究中, 聚焦于时间动态模式, 将有助于更好地理解植物基础资源功能性状和消费者的相互作用如何影响生态系统功能。 [ABSTRACT FROM AUTHOR] |
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