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global comprehensiveness value was 93% (61 articles indexed and 57 articles retrieved by the search string). See Additional fle 4 for more details on the comprehensiveness values. Internet searches Searches will be performed using the search engines: • Google Scholar (https://scholar.google.com/); • BASE (https://www.base-search.net) and/or CORE (https://core.ac.uk/). Te English search string detailed above will be used. If necessary, the search string will be modifed as per the search-engine help fles (when provided). To minimize bias in favor of published literature in search results provided by Google Scholar [14], searches will be performed on titles only and the frst 300 hits will be screened (based on sorting by relevance of results if possible). Specialist sources Te following French specialist organizations will be searched for relevant publications, including grey literature, using manual searches of their websites and automatic search facilities using French keywords if possible: • Information and Documentation Center on Noise (http://www.bruit.fr); • Document portal of the French Ecology Ministry (http://www.portail.documentation.developpementdurable.gouv.fr/); • Document database of the General commission for sustainable development (http://temis.documentat ion.developpement-durable.gouv.fr/). Supplementary searches A call for literature will be conducted through a professional network to fnd non peer-reviewed literature, including reports published in French or in English. Specialized organizations will also be requested to amplify the call for literature using their network, their web forum or their mailing list. Social media (http://www. academia.edu, http://www.researchgate.net and http:// www.linkedin.com) will be used to alert the research community concerning the systematic map and to request that subject experts submit non peer-reviewed publications. Article screening and study eligibility criteria Screening process Using the predefned inclusion/exclusion criteria detailed below, article selection will proceed according to a threestage hierarchical process, i.e. frst title, then abstract and fnally the full text. If there is any doubt regarding the presence of a relevant inclusion criterion or if there is insufcient information to make an informed decision, articles will be retained for assessment at a later stage. In particular, articles retained after title screening but that do not have an abstract will be immediately transferred to full-text screening. Given that titles and abstracts in grey literature do not conform to scientifc standards, assessments of grey literature will proceed immediately to the full-text screening phase. Care will be taken to ensure that reviewers never screen their own articles. Te three screening stages will be conducted by two or more reviewers. To assess the consistency of the inclusion/exclusion decisions, a Kappa test will be performed. To that end, before the actual screening process, a set of articles will be randomly selected and screened by each of the reviewers independently. Te operation will be repeated until reaching a Kappa value higher than 0.6. Whatever the Kappa value, disagreements will be discussed and resolved between the reviewers before beginning the screening process. During the scoping stage conducted in the “Web of Science Core Collection”, the three stages of the screening process were tested by one reviewer in order to refne the eligibility criteria. For the articles screened during the scoping stage, a second reviewer will examine the rejected articles to assess the consistency of the inclusion/exclusion decision. Eligibility criteria Article eligibility will be based on the list of criteria detailed in Table 2. Te list of all articles will be provided, informing the inclusion/exclusion decisions at the three Sordello et al. Environ Evid (2019) 8:8 Page 5 of 7 screening stages and, in case, reasons for the exclusion (see the code book in Additional fle 5). Data coding strategy All the studies passing the three screening stages will be included in the mapping database. Coding strategy Each article will be coded based on the full text using keywords and expanded comments felds describing various aspects of study (see the code book in Additional fle 6). Te key variables will include: • Study description: • Publication source (WOS research, Scopus research, Google Scholar research, etc.); • Basic bibliographic information (authors, title, publication date, journal, DOI, etc.); • Language (English/French); • Publication type (journal article, book, thesis…); • Study content (study, review, meta-analysis, other, etc.); • Study characteristics: • Country where the study was conducted; • Type of population studied (species or species groups); • Type of exposition, source of noise (e.g. urban, transportation, industrial activity, recreation, other), type of environment or media (terrestrial, aerial, aquatic), type of noise (artifcial, real, recorded); • Type of impacts, used to describe subtopics of noise pollution (e.g. space use, reproduction, communication, abundance, etc.) in relation to the outcomes; • Information on study quality: • Study context: in  situ (feld)/ex situ (laboratory, aquariums, etc.); • Experimental (causal)/Observational (correlative) study; • For experimental studies, the type of comparator (spatial/temporal). As far as possible, controlled 

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