2018

The growth of energy consumption demands a large expansion of transmission line (TL) networks worldwide. The reduction of the environmental impacts of these infrastructures will depend on the effectiveness of environmental impact assessments, that ultimately depend on the quality of the screening phase, the scoping phase, and the prioritization of potential environmental consequences. We conducted the first systematic review that encompasses all known potential impacts on biodiversity of the installation and operation of energy TLs, documented in the scientific literature and in a sample of Environmental Impact Studies (EIS). We examined 206 articles and 19 EIS and identified 28 impacts that correspond to biotic outcomes at the individual, population and community levels. Although scientific interest on TL impact evaluation is increasing, most studies have been focused on vertebrate taxa, especially birds. There are few published studies concerning habitat loss and the responses of functional groups with lower mobility or sensitive to physical alterations, such as amphibians. Most impacts appear in early stages of a project, during TL construction, but persist during operation. We summarized the biotic impacts in a framework that may guide the screening of relevant impacts to be included in the EIS and consequently improve the outcomes of the environmental licensing process of transmission line projects.