Table 1 Bibliographic databases and grey literature sources to be searched, including platforms used to access databases and years of institutional subscription access, where applicable. Search string modifications for grey literature sources with limitations are defined

EBSCO

Academic Search Premier

1887–2020

n/a

CAB Abstracts

1973–2020

Web of Science

BIOSIS Citation Index

1926–2020

n/a

Core collections

 SCI-EXPANDED

1945–2020

 SSCI

1956–2020

 A&HCI

1975–2020

 CPCI-S

1990–2020

 CPCI-SSH

1990–2020

 ESCI

2015–2020

Zoological Record

1864–2020

Lens.org

CORE

Crossref

PubMed

PubMed Central

Microsoft Academic

n/a

All substrings will be searched in title or abstract with proximity operator replaced with ~ n and restructured so that only one term will be within proximity to a set of terms. For example, in the biodiversity or population response substring, the first paired combination will become ((densit* OR diverse OR diversit* OR richness OR abundance OR composition OR similarit* OR distribution* OR occupancy) AND communit* ~ 10) and the same will be repeated for species and population*

Scopus

Scopus

1788–2020

W/n used as proximity operator

Google Scholar

Google Scholar

N/A

insect “systematic map” OR “systematic review” OR “evidence review” OR “evidence map” OR “systematic literature review” OR metaanalysis OR “meta analysis” OR meta-analysis OR “quantitative synthesis”

DART-Europe

DART-Europe E-theses

n/a

insect AND (review OR meta-analysis)

ProQuest

Dissertations & Theses A&I

1861–2020

noft(insect AND (review OR meta-analysis))

NDLTD

Networked Digital Library of Theses & Dissertations

1970–2020

n/a

OpenThesis

OpenThesis

1602–2020

synthesis substring searched only in title and abstract; other substrings searched in full text

CEEDER

CEEDER

2018–2019

insect OR invert*