SEED REMOVAL IN AN ATLANTIC FOREST FRAGMENT AND A RESTORATION SITE IN SOUTHERN BRAZIL

IF 0.1 0 LITERATURE, ROMANCE Revista do Instituto Florestal Pub Date : 2012-12-12 DOI:10.24278/2178-5031.2012242390
R. Cury, C. Shimamoto, Fernanda Fernandes Cordeiro de Lima, J. Torezan
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Abstract

In ecological restoration, the loss of seeds can be a major constraint to the establishment of seedlings and thus for the continuity of the forest succession process. The aim of this study was to evaluate the removal/predation of seeds in an area being restored (6.5 years old). We introduced seeds of six native tree species (five non-pioneers and one pioneer) into the restoration site, and also in an adjacent forest fragment, used as a control. Seed removal was greater in the forest fragment (56%) than in the restoration site (16%) for the whole set of species analyzed, and was more frequent during the first 15 days after exposure. In the forest fragment, four of the six species had more than 65% of their seeds removed. In the restoration site, seed removal did not surpass 40% for a single species and was lower than 5% for two species. The proportion of damaged seeds did not differ between environments (3.6% in the native forest and 7.6% in the area being restored). Our results indicate that post-dispersal seed removal is not a barrier to the establishment of tree species in the restoration site, suggesting that the secondary succession can be constrained by factors related to seed germination and/or seedling establishment.
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大西洋森林碎片的种子移除和巴西南部的恢复地点
在生态恢复中,种子的损失可能是树苗形成的主要制约因素,从而影响森林演替过程的连续性。本研究的目的是评估修复区(6.5年)种子的清除/捕食情况。我们将六种本地树种(五种非先锋树种和一种先锋树种)的种子引入恢复地点,并在邻近的森林片段中作为对照。对所有被分析的物种来说,森林碎片的种子清除率(56%)高于恢复地点(16%),并且在暴露后的前15天内更频繁。在森林碎片中,6个物种中有4个物种的种子被清除了65%以上。在恢复现场,单种种子去除率不超过40%,两种种子去除率低于5%。在不同的环境中,种子受损的比例没有差异(原生林为3.6%,恢复区为7.6%)。研究结果表明,分散后的种子清除并不是恢复地点树种建立的障碍,表明次生演替可能受到种子萌发和/或幼苗建立相关因素的限制。
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