Forest conversion to oil palm compresses food chain length in tropical streams.

Forest conversion to oil palm compresses food chain length in tropical streams.
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森林转变为油棕压缩了热带溪流的食物链长度。

DOI:
10.1002/ecy.3199
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发表时间:
2021
期刊:
影响因子:
4.8
通讯作者:
Wilkinson CL
Wilkinson CL
中科院分区:
环境科学与生态学1区
文献类型:
--
作者:
Wilkinson CL

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在东南亚,生物多样性丰富的森林正在被广泛砍伐,并转变为油棕单一种植。虽然这些变化对生物多样性的影响在很大程度上是有据可查的,但除了我们在201年收集的样本外,我们对这些大规模影响如何影响淡水营养生态知之甚少。我们使用稳定同位素分析(SIA)来确定土地利用变化对19个河流食物网中外来和本地基础资源相对贡献的影响。我们还应用化合物特异性SIA和散装SIA来确定鱼类顶端捕食者和中捕食者(反食动物和杂食动物)的营养位置。在不同土地利用类型的溪流中,两个消费群体的本地资源贡献(70-82%)没有差异。有没有变化的中-捕食者的营养位置,但营养位置下降的顶端捕食者在油棕榈种植园流相比,森林流。最大食物链长度的这种变化是由于土地利用类型中顶端捕食者身份的更替。水生营养生态的破坏,通过减少食物链长度和转移基础资源,可能会导致生物多样性以及生态系统功能和服务的重大变化。了解这一变化有助于制定更有重点的优先事项,以缓解人类活动对淡水生态系统的负面影响。
In Southeast Asia, biodiversity‐rich forests are being extensively logged and converted to oil palm monocultures. Although the impacts of these changes on biodiversity are largely well documented, we know addition to samples we collected in 201 little about how these large‐scale impacts affect freshwater trophic ecology. We used stable isotope analyses (SIA) to determine the impacts of land‐use changes on the relative contribution of allochthonous and autochthonous basal resources in 19 stream food webs. We also applied compound‐specific SIA and bulk‐SIA to determine the trophic position of fish apex predators and meso‐predators (invertivores and omnivores). There was no difference in the contribution of autochthonous resources in either consumer group (70–82%) among streams with different land‐use type. There was no change in trophic position for meso‐predators, but trophic position decreased significantly for apex predators in oil palm plantation streams compared to forest streams. This change in maximum food chain length was due to turnover in identity of the apex predator among land‐use types. Disruption of aquatic trophic ecology, through reduction in food chain length and shift in basal resources, may cause significant changes in biodiversity as well as ecosystem functions and services. Understanding this change can help develop more focused priorities for mediating the negative impacts of human activities on freshwater ecosystems.
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