Open with the Everglades snake problem. Tell students: in 1997 a hurricane hit a South Florida reptile-breeding facility, releasing Burmese pythons (Python bivittatus) into Everglades National Park. Between 2003 and 2011, nighttime road surveys documented raccoon sightings falling 99.3%, opossum 98.9%, and bobcat 87.5%. Marsh-rabbit and fox sightings dropped to zero. Ask: 'A single non-native predator wiped out most of a national park's mammals — but the park was already a protected area. Why didn't protection work?' Take 2–3 quick student responses. Then reveal that the Everglades is simultaneously losing 60% of its historic wetland area to drainage, receiving agricultural phosphorus runoff at 4× natural levels, and sits next to a metro area of 6 million people. Frame the day: 'One driver rarely acts alone. Today you'll use the HIPPO framework to diagnose these interacting pressures — the same way the AP exam will ask you to.' Targets SP 1 and SP 7 framing.

1. 7m

   The Three Levels of Biodiversity

   Content

   Biodiversity is not one number — it exists at three nested levels, and losing any one weakens the others. Genetic diversity is variation in alleles within a population; it is the raw material for adaptation. The Florida panther (Puma concolor coryi) collapsed to about 20 individuals in the 1990s and showed kinked tails, heart defects, and low sperm viability from inbreeding — genetic diversity had crashed even though the species still existed. Species diversity is richness (how many species) and evenness (how evenly individuals are distributed) within a community; a cornfield and a prairie can occupy the same area, but the prairie holds roughly 300 plant species versus 1. Ecosystem diversity is the variety of habitat types across a landscape — wetland, pine flatwood, hardwood hammock, seagrass — each supporting distinct communities. Losing ecosystem diversity (draining a wetland to plant sugarcane) collapses species and genetic diversity with it.

   Delivery

   Emphasize that AP free-response questions frequently penalize students who define biodiversity only as 'number of species.' Ask: 'If a zoo holds one breeding pair of every mammal species, is biodiversity preserved?' Push students to name what's missing (genetic variation, ecosystem context, ecological interactions). Pre-empt the misconception that saving a charismatic species saves the ecosystem — the panther example shows even a saved species can be genetically doomed without habitat. Targets SP 1.

2. 7m

   HIPPO — Ranked, but Interacting

   Content

   The HIPPO framework, coined by E.O. Wilson, ranks drivers in rough order of global impact: Habitat destruction (including fragmentation) is the largest single driver for terrestrial species — roughly 85% of species on the IUCN Red List are threatened by it. Invasive species are second globally and dominant on islands (Guam's brown tree snake eliminated 10 of 12 native forest birds). Pollution includes nutrient runoff causing Gulf of Mexico hypoxic zones (~15,000 km² annually), pesticides, plastics, and now CO₂-driven ocean acidification (surface pH dropped from ~8.2 to ~8.1, a 30% increase in H⁺). Population growth is a multiplier — 8 billion people amplify every other driver through the I = P × A × T identity. Overharvesting drives marine losses most sharply: ~34% of assessed fish stocks are fished beyond sustainable limits (FAO 2020). The critical AP point: rank order is global average, not local truth. In the Everglades, invasive pythons dominate mammal loss; in the Amazon, habitat destruction dominates; in the North Atlantic, overfishing dominates. Drivers also interact multiplicatively — fragmented habitat is more invasible; polluted water is less resilient to warming.

   Delivery

   Walk through the HIPPO impact-bar infographic on the slide, naming a signature example for each letter. Then explicitly correct the misconception that one driver is dominant everywhere — ask students to name the dominant driver in three different biomes and expect different answers. Ask: 'Why is habitat destruction usually largest but not always?' (Answer: it removes the substrate all other biodiversity depends on, but in island or aquatic systems other drivers can leapfrog it.) Targets SP 1, SP 2.

3. 6m

   Biodiversity → Ecosystem Services → Human Cost

   Content

   Biodiversity loss is not aesthetic — it degrades the services ecosystems provide, and those services have measurable dollar values. Pollination by wild insects contributes an estimated $235–577 billion per year to global crop production (IPBES 2016); ~75% of leading food crops depend at least partly on animal pollination. Wetlands filter nitrogen and phosphorus: New York City avoided a $6–8 billion water-treatment plant by protecting the Catskills watershed for about $1.5 billion. Coastal mangroves and reefs reduce storm surge — a 100 m band of mangrove can cut wave height by 66%. When biodiversity drops, redundancy drops: fewer pollinator species means one pathogen (like the Varroa mite in honeybees) can crater the whole service. This is why ecosystem resilience — the ability to absorb a disturbance and return — scales with diversity. The worked link students must be able to make on the FRQ: driver → biodiversity loss → specific service lost → specific human cost in dollars, health, or food security.

   Delivery

   Emphasize the causal chain — this is the exact structure of AP FRQ scoring. Model it aloud: 'Phosphorus runoff (pollution) → algal bloom kills fish and seagrass (species loss) → nursery habitat lost (ecosystem service loss) → commercial shrimp catch drops (human cost).' Ask students to build one chain out loud for pollinator decline before moving on. Correct the misconception that biodiversity loss is 'just' an environmental concern — the NYC Catskills number makes it concrete. Targets SP 1, SP 7.

1. 28m

   HIPPO Diagnosis: Everglades Case File

   Students work in pairs (25 min) then share out (3 min). They read a data-rich case file on the Everglades, classify each threat by HIPPO letter, rank drivers using evidence, calculate an ecosystem-service loss, and propose a conservation response. Targets SP 2 (map interpretation), SP 5 (data analysis), SP 6 (calculation), SP 7 (solution proposal). Walk around and check: (1) Are students citing SPECIFIC data from the case, not general statements? (2) Are they distinguishing habitat destruction from fragmentation? (3) On the calculation, do they include units and show setup? Give the last 3 minutes to two pairs to share their conservation proposals — pick one that emphasizes protected-area expansion and one that emphasizes sustainable-use policy for contrast. Student handout: Everglades HIPPO Case File Background. The Greater Everglades Ecosystem once covered ~11,000 km² of slow-flowing wetland from Lake Okeechobee to Florida Bay. It is a UNESCO World Heritage Site, a Ramsar Wetland of International Importance, and a national park. Data packet — read carefully. - Land use. Since 1900, ~50% of the original Everglades wetland has been drained for agriculture (sugarcane, mainly south of Lake Okeechobee) and urban development (Miami-Dade, Broward, Palm Beach counties, combined population ~6.1 million in 2020). The remaining wetland is fragmented by 2,300 km of canals and levees. - Species introductions. Burmese pythons (Python bivittatus), first documented breeding in 2000, now number an estimated 30,000–300,000. Between 2003 and 2011, nighttime road surveys recorded raccoons −99.3%, opossums −98.9%, bobcats −87.5%. Marsh rabbits and foxes: no sightings. Lionfish (Pterois volitans) invaded adjacent reefs beginning 2000s. - Water chemistry. Historic phosphorus concentration in Everglades sheet flow: ~4 µg/L. Current inflow from the Everglades Agricultural Area: ~15–20 µg/L. Result: cattail (Typha) is displacing sawgrass (Cladium) across ~65,000 ha, converting open marsh to dense monoculture. - Fisheries. Florida Bay commercial pink shrimp landings fell from ~10 million kg/yr in the 1980s to ~2 million kg/yr in the 2010s. Seagrass die-offs in 1987 and 2015 removed nursery habitat. - Wading birds. Nesting pairs of wading birds (ibises, herons, storks) declined ~90% from 1930s baseline (~265,000 pairs) to present (~25,000 pairs). - Ecosystem services (published estimates). Everglades wetlands provide an estimated $3.5 billion/year in combined services: water supply for 8 million Floridians, storm-surge attenuation, commercial fisheries, and tourism ($100+ million/year to the park alone). Part 1 — HIPPO classification (SP 1, SP 2). For EACH of the six threats below, write the HIPPO letter (H, I, P-pol, P-pop, or O) and cite the specific data point that justifies it. 1. Drainage of 50% of historic wetland → letter: ______ Evidence: ______ 2. 2,300 km of canals and levees → letter: ______ Evidence: ______ 3. Burmese python establishment → letter: ______ Evidence: ______ 4. Phosphorus inflow at 4× natural levels → letter: ______ Evidence: ______ 5. 6.1 million people in adjacent metro → letter: ______ Evidence: ______ 6. Pink shrimp landings declining 80% → letter: ______ Evidence: ______ (careful — which HIPPO driver CAUSED this?) Part 2 — Rank the drivers (SP 5, SP 7). Rank H, I, P-pol, P-pop, O from most to least impactful IN THIS ECOSYSTEM. Justify your #1 in 2–3 sentences using data from the case. Do not default to the global rank order — argue from the Everglades evidence. Part 3 — Ecosystem service calculation (SP 6). The pink shrimp fishery lost 8 million kg/yr of landings. If dockside price is $5.50/kg: - Annual revenue lost = ______ $/yr - Over a 30-year period, cumulative revenue lost = ______ $ (show setup) - This is only ONE service. Name two other services from the data packet that were ALSO degraded by the same driver: ______ Part 4 — Causal chain (SP 1). Complete the chain for wading birds in one sentence per arrow: Driver: ______ → Biodiversity change: ______ → Ecosystem service affected: ______ → Human cost: ______ Part 5 — Conservation proposal (SP 7). You advise the South Florida Water Management District. In 4–6 sentences, propose ONE intervention that addresses the TOP TWO drivers you ranked. Your proposal must: - Name the specific tool (protected-area expansion, wildlife corridor, phosphorus TMDL, python bounty program, sustainable-use zoning, restoration of sheet flow, etc.) - Explain the mechanism — how does it reduce the driver? - Identify ONE trade-off or limitation (economic, political, or ecological).

   Materials

   • Printed case file handout (one per pair)
   • Colored pencils or highlighters
   • Calculator

   Example outputs

   • Part 1, item 3: Letter I (Invasive species). Evidence: Burmese python, non-native, correlates with 99.3% raccoon decline 2003–2011.
   • Part 2 ranking (example): 1) H — half of wetland drained plus 2,300 km of fragmentation is the substrate loss all other species depend on; 2) I — pythons collapsed mammal community faster than any other driver in this ecosystem; 3) P-pol — phosphorus is converting sawgrass to cattail across 65,000 ha; 4) P-pop — 6.1M people drive H, I, and P; 5) O — overharvest is downstream of habitat and pollution here, not primary.
   • Part 3: 8,000,000 kg × $5.50/kg = $44,000,000/yr lost; over 30 yr = $1.32 billion. Other services degraded by seagrass die-off: nursery habitat for other fisheries, carbon storage, water clarity.
   • Part 5: 'Restore sheet flow by decommissioning ~400 km of canals in Water Conservation Area 3 and enforce a phosphorus TMDL of 10 µg/L on EAA discharges via constructed stormwater treatment wetlands. Mechanism: rehydration restores sawgrass and wading-bird foraging depth (addresses H); reduced P halts cattail expansion (addresses P-pol). Trade-off: sugarcane growers lose ~$150M/yr in yield and will resist politically.'
2. 3m

   Gallery Share

   Two pre-selected pairs (one favoring protected-area expansion, one favoring sustainable-use policy) share their Part 5 proposal in ~60 seconds each. Class votes by show of hands which is more likely to succeed politically and which is more likely to succeed ecologically — surface that these are often different answers. Targets SP 7.

   Example outputs

   • Pair A proposes expanding protected-area boundaries by acquiring 40,000 ha of EAA land — ecologically strong, politically difficult.
   • Pair B proposes a phosphorus cap-and-trade among sugarcane growers with certified sustainable-use labeling — politically easier, ecologically slower.

1. Which of the following best explains why habitat destruction is generally ranked as the leading driver of terrestrial biodiversity loss globally, even though it is NOT the leading driver in the Everglades mammal community? (A) Habitat destruction only matters on continents, not in wetlands. (B) Habitat destruction removes the physical substrate that species need to persist, but in specific ecosystems another driver can act faster or more completely. (C) Invasive species always dominate in tropical ecosystems, so habitat destruction is irrelevant there. (D) The global ranking is arbitrary and does not reflect real ecological impact.

   multiple choiceB. Habitat destruction is the largest driver on average because it removes the substrate all biodiversity depends on, but rankings vary by ecosystem — in the Everglades, invasive Burmese pythons collapsed the mammal community faster than habitat loss did. Targets SP 1.

2. A coastal wetland loses 70% of its area to urban development over 40 years. Describe the causal chain from this driver to a specific human cost, naming (a) the HIPPO driver, (b) the level(s) of biodiversity lost, (c) one specific ecosystem service degraded, and (d) a quantifiable human consequence.

   short answer(a) Habitat destruction (H). (b) Ecosystem diversity is lost directly; species diversity drops as wetland-obligate species (e.g., wading birds, juvenile fish) lose habitat; genetic diversity in remaining fragmented populations declines from small population size. (c) Storm-surge attenuation and/or water filtration and/or fisheries nursery habitat. (d) Example: increased flood damage during hurricanes (billions of dollars in a single storm), or loss of commercial fishery revenue (e.g., $44 million/yr as in the Everglades pink shrimp case), or higher municipal water treatment costs. Full credit requires a specific service AND a quantified or clearly stated human cost. Targets SP 1, SP 7.

3. A student claims: 'If we establish a large national park around a charismatic species like the Florida panther, we will preserve the biodiversity of that region.' Evaluate this claim. Give TWO specific reasons it is incomplete.

   short answerThe claim is incomplete. (1) Protecting one species does not preserve genetic diversity — the Florida panther bottleneck to ~20 individuals produced heart defects and low sperm viability even inside protected habitat; a park boundary does not restore alleles. (2) Protected areas do not stop drivers that cross boundaries: invasive Burmese pythons, phosphorus pollution from upstream agriculture, and climate change all operate inside Everglades National Park. Full biodiversity protection requires addressing multiple HIPPO drivers at landscape scale and managing all three levels of biodiversity (genetic, species, ecosystem), not just charismatic species preservation. Targets SP 3, SP 7.

4. Gulf of Mexico commercial fisheries lose an estimated $82 million per year due to hypoxic 'dead zones' caused primarily by nitrogen and phosphorus runoff from Mississippi River basin agriculture. (a) Identify the primary HIPPO driver. (b) If a proposed nutrient-reduction policy would cost farmers $150 million/yr but restore 60% of the lost fishery value, calculate the net annual economic effect and state whether the policy is economically justified on fishery grounds alone.

   calculation(a) Pollution (P). Nitrogen and phosphorus runoff cause algal blooms → decomposition depletes O₂ → hypoxia kills benthic fauna and displaces fish. (b) Fishery value restored = 0.60 × $82 million = $49.2 million/yr. Net effect = $49.2 million − $150 million = −$100.8 million/yr. On fishery grounds ALONE, the policy is NOT economically justified — costs exceed recovered fishery value by ~$101 million/yr. However, a full accounting would add other ecosystem services (recreation, tourism, drinking water, biodiversity, coastal resilience), which typically shift the balance toward justification. Targets SP 6, SP 7.

• ☐Printed Everglades case file handout (one per pair, ~2 pages)
• ☐Colored pencils or highlighters (for HIPPO color-coding)
• ☐Calculators (or phones)
• ☐Projector / slide deck
• ☐Printed formative assessment (or digital form)