Nogueira Denis Silva, Calvão Lenize Batista, de Assis Montag Luciano Fogaça, Juen Leandro, De Marco Paulo
Programa de Pós-Graduação em Ecologia e Evolução, Universidade Federal de Goiás, Instituto de Ciências Biológicas (Bloco ICB V), Campus II/UFG, Goiânia, Goiás, CEP: 74001-970, Brazil.
Laboratório de Ecologia e Conservação, Universidade Federal do Pará, Instituto de Ciências Biológicas, Rua Augusto Correia, N° 1 Bairro Guamá, Belém, Pará, CEP 66.075-110, Brazil.
Environ Monit Assess. 2016 Jul;188(7):441. doi: 10.1007/s10661-016-5431-z. Epub 2016 Jun 29.
Selective logging has become a major source of threats to tropical forest, bringing challenges for both ecologists and managers to develop low-impact forestry. Reduced-impact logging (RIL) is a prominent activity accounting for such forestry practices to prevent strong forest disturbances. Our aims were to evaluate the effects of RIL on insect communities of forested streams from Eastern Amazon and to test the hypothesis of negative effects of RIL on species richness, abundance, and functional feeding groups of aquatic insect assemblages. Neither of the evaluated metrics of the studied assemblages were negatively affected by RIL. Environmental metrics, such as substrate heterogeneity, woody canopy cover, and hill slope height, varied more among RIL streams than in reference streams, indicating a gradient according to logging impacts, and are suitable candidates to monitor RIL impacts in Amazonian streams. In addition, the PHI index also varied among REF and RIL, according to age class and year of logging, which could reflect trends to recover the forest structure after logging in a time frame of only 10 years. We conclude that RIL impacts have not had detrimental impacts on insect communities, but have changed little of the environmental conditions, especially of the riparian vegetation around streams.
选择性采伐已成为热带森林面临的主要威胁之一，给生态学家和管理者发展低影响林业带来了挑战。减少影响采伐（RIL）是此类林业实践中的一项重要活动，旨在防止森林受到严重干扰。我们的目的是评估减少影响采伐对亚马逊东部森林溪流昆虫群落的影响，并检验减少影响采伐对水生昆虫群落物种丰富度、丰度和功能摄食组产生负面影响的假设。研究群落的评估指标均未受到减少影响采伐的负面影响。环境指标，如基质异质性、木质冠层覆盖和山坡高度，在减少影响采伐的溪流中比在对照溪流中变化更大，表明存在一个根据采伐影响程度划分的梯度，并且是监测亚马逊溪流中减少影响采伐影响的合适指标。此外，PHI指数在对照溪流和减少影响采伐的溪流之间也因采伐年龄和年份而有所不同，这可能反映了在仅10年的时间框架内采伐后森林结构恢复的趋势。我们得出结论，减少影响采伐的影响并未对昆虫群落产生有害影响，但对环境条件，尤其是溪流周围的河岸植被影响很小。
