Concept · biology
Biodiversity
Follow Biodiversity — see important new research and changes in evidence.Change log
What changed
Dated edits to this page's evidence: studies added or removed from a claim, claims added or withdrawn, and new explanations tagged here. Rewordings are not listed.
- Concept page published
Biodiversity is variation among living systems at genetic, species, and ecosystem levels, measured and compared across places and times.
Biodiversity evidence anchors conservation and community ecology in measurable patterns.
Evidence
What the evidence shows
Drawn from 8 studies in this library. Each finding starts with a plain-language takeaway, then the denser detail. Supports means evidence for a finding; Challenges means evidence against a stated position; Qualifies marks scope with a short note on each study’s contribution. Challenged positions are labeled — they are not findings.
Multiple empirical papers in this library examine biodiversity with mechanistic biological findings.
- Plant gene duplicates after polyploidy cycles
- Pollinator diversity stabilizes plant communities
- How many species live on Earth and in the ocean?
Study Role Design N Population Outcome Plant gene duplicates after polyploidy cycles Supports Computational / modellingClassified duplicate genes across sequenced plant genomes into WGD and single-gene modes N=141 · 141 sequenced plant genomes Sequenced plant genomes across the plant kingdom Modes of gene duplication after polyploidization–diploidization cycles Pollinator diversity stabilizes plant communities Supports OtherExperimental plant communities with manipulated syrphid and bumble-bee pollination guilds N=36 · 36 plots of 4 m² with 30 adult plants each (open- vs tubular-flower communities) Experimental plant–pollinator communities (syrphids and bumble bees) Plant community persistence under complementary pollinator functional groups How many species live on Earth and in the ocean? Supports Computational / modellingHigher-taxon discovery models extrapolating eukaryotic species richness, plus taxonomist survey N=548 · 548 taxonomists responded of ~2,938 contacted (18.7%); species estimate ~8.7 million is model-based Global taxonomic catalogues and surveyed taxonomy experts Estimated number of eukaryotic species on Earth and in the ocean Recent WGDs retain more WGD pairs; Brassicas show frequent WGT; modes vary by clade.
Bumble bees pollinate both flower types; syrphids mainly open flowers; combined guilds boost persistence.
They estimate ~8.7 million species overall, narrowing prior expert ranges of 3–100 million, and conclude only ~14% of Earth and ~9% of ocean species are catalogued after 250 years of taxonomy.
Projected impacts depend on habitat associations and limited dispersal assumptions; range shifts may alleviate some climate impacts while land-use threats remain critical.
Open questions
Tensions and limits
Some items are genuine disagreements on the same question. Others mark different assays, populations, or outcomes — limits on how far one study travels — not a forced fight between papers.
Systems and scales differ across biodiversity studies (species, tissues, methods), so mechanisms should not be over-generalised.
- Plant gene duplicates after polyploidy cycles
- Pollinator diversity stabilizes plant communities
- How many species live on Earth and in the ocean?
Study Role Design N Population Outcome Plant gene duplicates after polyploidy cycles Supports Computational / modellingClassified duplicate genes across sequenced plant genomes into WGD and single-gene modes N=141 · 141 sequenced plant genomes Sequenced plant genomes across the plant kingdom Modes of gene duplication after polyploidization–diploidization cycles Pollinator diversity stabilizes plant communities Supports OtherExperimental plant communities with manipulated syrphid and bumble-bee pollination guilds N=36 · 36 plots of 4 m² with 30 adult plants each (open- vs tubular-flower communities) Experimental plant–pollinator communities (syrphids and bumble bees) Plant community persistence under complementary pollinator functional groups How many species live on Earth and in the ocean? Supports Computational / modellingHigher-taxon discovery models extrapolating eukaryotic species richness, plus taxonomist survey N=548 · 548 taxonomists responded of ~2,938 contacted (18.7%); species estimate ~8.7 million is model-based Global taxonomic catalogues and surveyed taxonomy experts Estimated number of eukaryotic species on Earth and in the ocean
Common misconceptions
Biodiversity findings from one model organism always transfer to humans.
Model systems teach mechanism; transfer to other species is a separate empirical claim.
Exam-style questions
Short-answer questions that ask you to explain or compare, not recall.
What is Biodiversity?
Biodiversity is variation among living systems at genetic, species, and ecosystem levels, measured and compared across places and times.
Why does Biodiversity matter for biology undergraduates?
Biodiversity evidence anchors conservation and community ecology in measurable patterns.
The studies
8 studies in this library bear on Biodiversity, ordered by citations.
- How many species live on Earth and in the ocean?
A validated taxonomic extrapolation estimates ~8.7 million eukaryotic species on Earth, with most still undescribed.
- Plant gene duplicates after polyploidy cycles
Across plant genomes, WGD and other duplication modes leave distinct, lineage-biased duplicate landscapes.
- What makes Apis cerana’s genome distinctive?
The Asian honey bee genome reveals expanded chemosensory receptors (Ors/Grs/Irs) central to chemical communication and colony life.
- How will climate and land use hit bird diversity?
Integrating climate and land-use change via land-cover exposure projects substantial impacts on global bird diversity, with clear ecological assumptions.
- Aspergillus genomic diversity
Comparative genomics shows Aspergillus species share genome size but harbor large lineage-specific gene sets.
- Pollinator diversity stabilizes plant communities
Mixing pollinator functional groups increases plant community persistence via complementary pollination.
- Planning reserves for ecosystem services
Ecosystem services and biodiversity map differently, so conservation plans face spatial tradeoffs.
- Where should new protected areas go?
Most threatened vertebrates are inadequately protected; expanding reserves by cost or ecoregions alone poorly covers imperiled species.
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