Concept
Biodiversity
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 claim links to the studies behind it.
Multiple empirical papers in this library examine biodiversity with mechanistic biological findings.
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
Where studies disagree
Open questions, not settled findings — worth knowing before you cite any one of these.
Systems and scales differ across biodiversity studies (species, tissues, methods), so mechanisms should not be over-generalised.
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
- 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.
Learn alongside
Flashcards
Study Biodiversity properly
Save this deck to NoteFren and review it with spaced repetition.