Biodiversity: The ravages of guns, nets and bulldozers

• Partly supportedPremiseAmong plant, amphibian, reptile, bird and mammal extinctions since AD 1500, 75% involved overexploitation, agriculture, or both, often alongside invasive aliens.The Results (section 3; page unavailable) report that, among the 215 extinct species in the five taxa, 58% were affected by biological resource use, 28% by agriculture or aquaculture, and 58% by alien species. They also say species commonly had more than one listed threat, supporting the possibility of combined threats. The paper does not report that 75% were affected by overexploitation or agriculture or establish how often those threats specifically coincided with alien species. (LLM, conf=0.83)§ WHAT NEXT? · cites sources
• SupportedPremiseFor many species, the mix of threats that determines extinction risk will shift within the next few decades.The Introduction (page unavailable) says habitat loss, over-exploitation and invasive species have largely driven extinctions, while climate change is becoming a significant new threat. It also reports projections of increased climate-related extinction risk within this century, including species potentially committed to extinction by 2050. Together, these support the claimed shift in the balance of threats over the coming decades. (LLM, conf=0.87)§ DATA LIMITATIONS · cites sources
• Partly supportedPremiseResearch indicates that Red List categories based on projected climate-change extinction risk are more reliable than earlier believed.The Introduction (page not supplied) describes earlier doubts about whether Red List criteria can detect climate-change extinction risk. The Factors influencing performance section reports that assessments for later in the twenty-first century were robust to missing data, but the study examined one amphibian species and cautions that early detection can depend on assessing criterion E. The claim overgeneralizes that qualified finding to Red List categorizations broadly. (LLM, conf=0.83)§ DATA LIMITATIONS · cites sources
• SupportedPremiseEffective methods exist to reduce the damage from overexploitation and agriculture.The Discussion says that threats from agriculture and hunting can be treated through site creation, restoration, reintroduction, legislation and effective site management. It also says effective legislation can counter over-hunting, while cautioning that these strategies are not guaranteed to work. (LLM, conf=0.91)§ WHAT NEXT? · cites sources
• Partly supportedFindingThe species groups with complete assessments are not a random selection from the tree of life; they tend to be better studied.The Methods section lists particular taxonomic groups with comprehensive assessments and distinguishes them from a separate taxonomically stratified effort intended to be representative. The Data Records section says some assessed groups are better known than others, but it does not establish that comprehensively assessed groups are generally better studied than groups outside that selection. Page numbers are not available in our copy. (LLM, conf=0.81)§ DATA LIMITATIONS · cites sources
• Partly supportedInterpretationClimate change is set to grow as a leading threat within the biodiversity crisis.The Introduction (page unavailable) says climate change is becoming a significant new threat and describes substantial projected extinction risks. It does not say climate change will become a dominant threat relative to habitat loss, overexploitation and invasive species, which the Results identify as the current dominant stressors. (LLM, conf=0.82)§ WHAT NEXT? · cites sources
• No basis givenFindingExtinction-risk data exist for just roughly 0.1% of the estimated 50,000-plus fungal species.Stated as a result, but no data or citation backs it.§ DATA LIMITATIONS · no basis stated
• No basis givenFindingLogging that is not sustainable is driving declines in over 4,000 species that depend on forests.Stated as a result, but no data or citation backs it.§ ON THE LIST · no basis stated
• Own resultFindingMore than 4,600 species are under threat from land modification associated with production of food, fodder or fuel crops.From the paper’s own data. Not checkable against an outside source.§ ON THE LIST · own data
• Own resultFindingOver 80% of the species in the analysis face more than one major threat.From the paper’s own data. Not checkable against an outside source.§ ON THE LIST · own data

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