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Seed Removal Rates in Forest Remnants Respond to Forest Loss at the Landscape Scale

Forests(2020)SCI 3区

Univ Liege | Univ Estadual Santa Cruz UESC

Cited 7|Views8
Abstract
Seed removal is a key component of seed dispersal and may be influenced by both landscape-scale and local attributes, and it has been used as an indicator of the intensity of interactions between ecosystem components. We examined how the seed removal rates, which integrate the activity of seed dispersers and seed predators, vary with landscape-scale forest cover. We collected data under 34 trees belonging to two zoochoric species (Helicostylis tomentosa (Poepp. and Endl.) J. F. Macbr. and Inga vera Willd.) in 17 remnants in the Brazilian Atlantic forest, with different percentages of forest cover. The seed removal rate was estimated using a fast method based on the abundance of intact fruits and fruit scraps on the ground. The amount of forest cover affected the rate of seed removal in a humpbacked shape, with a maximum seed removal rate at intermediate forest cover. Seed removal rates must be related to the amount of food resources offered and diversity of dispersers and predators in the region. In landscapes with intermediate forest amount, there is a better balance between supply and demand for fruits, leading to a higher seed removal rate than more deforested or forested landscape. Our results also show that local factors, such as crop size and canopy surface, together with forest cover amount, are also important to the removal rate, depending on the species. In addition, our results showed that plant–animal interactions are occurring in all fragments, but the health status of these forests is similar to disturbed forests, even in sites immersed in forested landscapes.
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animal extirpation,forest health indicator,frugivory,satiation,tropical forest
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要点】:研究探讨了森林片段中的种子移除率如何随着景观尺度上的森林覆盖率变化,发现种子移除率呈现中间森林覆盖率最高。

方法】:通过在巴西大西洋森林的17个片段下34棵树上收集两种动物传播种子(Helicostylis tomentosa和Inga vera)的数据,使用基于地面完整果实和果实残渣丰富度的快速方法估计种子移除率。

实验】:在17个不同森林覆盖率(百分比未具体提及)的森林片段中开展实验,使用的数据集为现场收集的果实和果实残渣数据,实验结果表明种子移除率与森林覆盖率呈现驼峰形关系,并在中间覆盖率时达到最高。