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首页> 外文期刊>Ecological research >Edge effects in a tropical montane forest mosaic: experimental tests of post-dispersal acorn removal
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Edge effects in a tropical montane forest mosaic: experimental tests of post-dispersal acorn removal

机译：热带山地森林马赛克中的边缘效应：分散橡子去除后的实验测试

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Forest edges created by scattered-patch clear-cutting have become common in tropical montane cloud forests in the highlands of Chiapas, Mexico. It was hypothesised that forest edges may influence regeneration of oak species, which are canopy dominants in these forests, by affecting the activities of small mammal species. Acorns of different oak species varying in germination timing were offered to predators and/or dis-persers at different positions along replicated forest edges during 2 consecutive years. We investigated the effects of (1) edge type (hard and soft), (2) distance from the edge (0, 15, 30, 45 and 60 m inside forest fragments) and (3) oak species, on the rate of acorn removal mainly by small mammals. During a non-masting year, acorn removal was affected by the interaction of edge type and distance from the edge (P < 0.05), with acorn removal being highest near hard edges compared to adjacent forest interiors. As predicted, acorn removal was greater along soft (100%) than along hard edges (82%), but this pattern was recorded only during the non-masting year. This study partly supports previous studies of rodents preferentially consuming acorns with early germination rather than acorns exhibiting dormancy, however these patterns may change with variation in acorn abundance. These results suggest that patch clear-cutting affects regeneration processes within forest fragments by influencing the activities of small mammals, but the nature of this effect also depends on acorn abundance and the characteristics of the forest edge created.
机译：在墨西哥恰帕斯州高地的热带山地云雾森林中，由零散的斑块砍伐所形成的森林边缘已经很普遍。假设森林边缘可能通过影响小型哺乳动物物种的活动来影响橡树种的再生，而橡树种是这些森林中的树冠优势。在连续2年中，沿着复制森林的边缘，在不同位置向捕食者和/或分散者提供不同萌发时间的不同橡子的橡子。我们调查了（1）边缘类型（硬和软），（2）距边缘（森林碎片内部的0、15、30、45和60 m）和（3）橡树种对橡果率的影响主要由小型哺乳动物清除。在非成熟年份，橡子的去除受到边缘类型和到边缘的距离的交互作用的影响（P <0.05），与相邻森林内部相比，硬边缘附近的橡子去除率最高。如预测的那样，沿软边缘（100％）的橡子去除率大于沿硬边缘（82％）的橡子去除率，但是这种模式仅在非成熟年份记录。这项研究部分支持先前关于啮齿类动物优先食用具有早期发芽而不是表现出休眠状态的橡子的研究，但是这些模式可能会随着橡子丰度的变化而改变。这些结果表明，斑块清除通过影响小型哺乳动物的活动而影响森林碎片内的再生过程，但这种作用的性质还取决于橡子的丰度和所形成的森林边缘的特征。

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