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Table 1 Components of the systematic review subquestions (SQ)

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

  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