Silvina Beatriz Bongiovanni, Marisa Nordenstahl, Carlos Eduardo Borghi
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引用次数: 0
摘要
在某些情况下,地下啮齿动物会改变周围环境,被归类为关键物种和/或生态系统工程师。如果地下啮齿动物在整个物种分布范围内产生的变化是变化的,并且在某些环境条件下更为强烈,那么它们的这种作用可能与环境有关。我们的目的是分析栉水母对植被覆盖度的影响是否与环境有关。鉴于初级生产力可能会提高植物对草食动物的耐受能力或补偿能力,我们假设栉水母对植被覆盖度的影响将沿着初级生产力梯度随环境变化而变化,在生产力高的环境中影响较小,而在生产力低的环境中影响较大。我们比较了 C. mendocinus 在四种不同环境中对植物覆盖率的影响,发现它以可预测的方式取决于初级生产力。在生产力较低的环境中,啮齿动物会显著降低植被覆盖度,而在生产力较高的环境中则没有明显影响。这些发现表明,啮齿动物对植物覆盖率的影响取决于初级生产力水平,并强调了考虑影响啮齿动物与植物相互作用强度的潜在环境因素的重要性。
Effect of an herbivorous subterranean rodent on vegetation in relation to primary productivity
Subterranean rodents modify the surrounding environment being classified, in some cases, as keystone species and/or ecosystem engineers. This role could be context-dependent if the changes produced shift throughout the species distribution range and are stronger under certain environmental conditions. Our objective was to analyse whether the effect of Ctenomys mendocinus on vegetation cover is context-dependent. Given that primary productivity may increase plants' ability to tolerate or compensate following herbivory, we hypothesize that the effect of C. mendocinus on vegetation cover will be context-dependent along a primary productivity gradient, with smaller effects in highly productive environments and larger effects in less productive ones. We compared the effect of C. mendocinus on plant cover among four contrasting environments and found that it depended on primary productivity in a predictable manner. In low productivity environments, the rodent significantly reduces vegetation cover, while it has no discernible effect in highly productive ones. These findings suggest that the effect of C. mendocinus on plant cover depends on primary productivity level and highlights the importance of accounting for the underlying environmental factors that influence the intensity of C. mendocinus–plant interaction.
期刊介绍:
Austral Ecology is the premier journal for basic and applied ecology in the Southern Hemisphere. As the official Journal of The Ecological Society of Australia (ESA), Austral Ecology addresses the commonality between ecosystems in Australia and many parts of southern Africa, South America, New Zealand and Oceania. For example many species in the unique biotas of these regions share common Gondwana ancestors. ESA''s aim is to publish innovative research to encourage the sharing of information and experiences that enrich the understanding of the ecology of the Southern Hemisphere.
Austral Ecology involves an editorial board with representatives from Australia, South Africa, New Zealand, Brazil and Argentina. These representatives provide expert opinions, access to qualified reviewers and act as a focus for attracting a wide range of contributions from countries across the region.
Austral Ecology publishes original papers describing experimental, observational or theoretical studies on terrestrial, marine or freshwater systems, which are considered without taxonomic bias. Special thematic issues are published regularly, including symposia on the ecology of estuaries and soft sediment habitats, freshwater systems and coral reef fish.