What is the evidence that invasive species are a significant contributor to the decline or loss of threatened species? A systematic review map

Table 1 Components of the systematic review subquestions (SQ)

	Population	Intervention/exposure	Comparator/study design/evidence type	Outcome
SQ1	Threatened species: US FWS listed Endangered, Threatened and Candidate species	Invasive species	No invasive species: randomised block design time series (before and after); Site comparison (comparing exposure to non-exposure on adjacent sites); Observations	Change in status of the Threatened species population size (size/range/density/fecundity etc.)
SQ2	Invasive species	Threatened species: US FWS listed Endangered, Threatened and Candidate species	Biological papers, laboratory studies, genetic studies	Mechanism by which the invasive species has competitive advantage over other species

ISSN: 2047-2382