Safety, ethics and evidence boundary
Use public/de-identified conservation datasets and safe non-contact observation. Protect sensitive species locations and community privacy. Conservation choices involve ecological evidence plus rights, costs, access, and community values; science informs consequences but does not erase civic or ethical tradeoffs.
Explicit science instruction
Species richness counts represented species. Evenness describes how balanced their abundances are. Diversity indices combine these dimensions in different ways. Genetic diversity, functional diversity and ecosystem diversity add further layers.
Sampling method and detectability strongly influence measured diversity, so comparisons require similar effort and scale.
Vocabulary: richness; evenness; abundance; Simpson diversity; Shannon concept; detectability; sampling effort.
Worked example with reasoning
Community A counts [25,25,25,25] and B [85,5,5,5]. Both have richness 4, but A is much more even. A diversity index reflecting dominance will distinguish them.
Guided question
Why can two communities with the same richness differ greatly in biodiversity structure?
Independent work
- Calculate richness for three samples.
- Compare evenness qualitatively.
- Use a supplied Simpson-style calculation.
- List two detection biases.
Misconception check
A higher diversity-index number is not automatically “better” in every management context; native status, function, rarity and goals matter.
Formative understanding check
What does richness ignore?
Worked response
Relative abundance/evenness and many other dimensions such as genetic or functional diversity.
Open-book formative practice only; not an official mastery attempt or grade.
Mentor evidence conference
Ask Archaemenes to challenge the evidence, stakeholder assumptions, quantitative model, tradeoffs, and revision criteria.
Open ArchaemenesTeacher guidance
Foundation: use count tables. Core: calculate and compare indices. Extended: evaluate sensitivity to rare species and sampling effort.
Preserve learning evidence
Keep data, design choices, corrections, stakeholder reasoning, and uncertainty in the matching Week 34 evidence field.