Biodiversity: count species, explain resilience
הוצג| English | משמעות |
|---|---|
| biodiversity/ˌbaɪəʊdaɪˈvɜːsɪti/ | מגוון ביולוגי |
| species richness/ˈspiːsiːz ˈrɪtʃnəs/ | עושר מין |
What would explain this observation?
- A field with thousands of one crop can have fewer species than a small mixed meadow. Abundance and biodiversity 生物多样性 measure different things.
Build the model
- Biodiversity is the variety of different species within an ecosystem or across Earth.
- A community with more alternative feeding and shelter relationships may depend less on any single species, supporting stability when one population changes.
- Human life relies on functioning ecosystems and their resources; many human activities reduce species variety.
- biodiversity: Variety of different species within an ecosystem or across Earth.
- species richness 物种丰富度: The number of different species recorded in a defined sample.
Which has greater recorded species richness?
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
Richness counts species, so seven species beats four and one, whatever the individual totals. A thousand individuals of one species is still one species.
Match each technical term to its precise meaning.
רמת קושי 2/5 · 140 מטבעות + בונוס קטן בהשלמה הראשונה היום
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- A species count is one useful measure, but an incomplete survey misses organisms and does not describe every aspect of diversity.
- The specification’s stability account is a mechanism to explain rather than a guarantee that every diverse ecosystem resists every disturbance.
- Habitat condition, population sizes and interactions also matter.
In the lab: Compare supplied species lists using equal area and effort. Separate number of species from total individuals, then explain how loss of one species might affect a stated network. Evaluate conservation proposals using habitat needs and monitoring evidence, without claiming that a short species list measures all global biodiversity.
Which two habits make the investigation or model in this case more defensible?
רמת קושי 2/5 · 140 מטבעות + בונוס קטן בהשלמה הראשונה היום
Stating the conditions and assumptions lets others repeat the work exactly, and recording the supporting evidence lets them check the conclusion. Hiding disagreeing results removes the evidence that could challenge a wrong conclusion, and one measurement can never establish a wider claim.
Work from known quantities
- Known: site A has 80 individuals across 4 recorded species; site B has 60 individuals across 7 recorded species.
- B has greater recorded species variety despite fewer individuals.
- Difference in recorded richness = 7−4 = 3 species.
- This comparison is conditional on equally effective sampling.
Your turn: Equal-effort surveys record 9 species at one site and 14 at another. Find the difference.
Equal-effort surveys record 9 species at one site and 14 at another. Find the difference.
רמת קושי 2/5 · 140 מטבעות + בונוס קטן בהשלמה הראשונה היום
The result is 5 species. Known: 9 species and 14 species in equal-effort surveys. Difference = 14 - 9 = 5 species. The comparison holds only because the sampling effort was matched.
Check the conclusion and its limits
- A larger population of one species does not necessarily increase biodiversity.
- A missing species after one survey may reflect detection limits.
- Stability is supported by several interacting processes, so a species count alone cannot prove the cause of resilience.
Not true: Increasing the number of one crop automatically increases species richness. Richness is the NUMBER OF SPECIES. Pouring more individuals into one crop raises that crop's population but leaves species richness unchanged - and usually lowers it through monoculture.
- Biodiversity is the variety of different species within an ecosystem or across Earth.
- A species count is one useful measure, but an incomplete survey misses organisms and does not describe every aspect of diversity.
- Watch for: A larger population of one species does not necessarily increase biodiversity.
Richness is the NUMBER OF SPECIES.
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
True. Richness is the NUMBER OF SPECIES. Pouring more individuals into one crop raises that crop's population but leaves species richness unchanged - and usually lowers it through monoculture.
Variety of different species within an ecosystem or across Earth: write the technical term.
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
biodiversity means Variety of different species within an ecosystem or across Earth.