ECO-01 Real-world & Environmental Applications

Invasive species and competitive exclusion: Introduction of goats to Abingdon Island drove native Abingdon tortoises to extinction by outcompeting them for vegetation — a real-world demonstration of Gause's principle
Biological pest control via predation: Prickly pear cactus (Opuntia) overran 60 million acres in Australia; introduction of its natural predator moth (Cactoblastis cactorum) controlled it without chemicals — evidence that predators regulate prey populations
Antibiotics from amensalism: Penicillin, derived from the natural amensalism between Penicillium mold and Staphylococcus, became the foundation of modern antibiotic therapy — Fleming's discovery was ecological in origin
Nitrogen fixation and agriculture: Rhizobium–legume mutualism reduces synthetic fertiliser requirements; crop rotation with legumes (soybean, pea) replenishes soil nitrogen, reducing eutrophication risk
Coral reef productivity: Despite covering <1% of the ocean floor, coral reefs produce ~25% of all marine species, illustrating extreme productivity in nutrient-limited environments (the "ocean desert paradox")
Deforestation and secondary succession: Abandoned agricultural land undergoes secondary succession; tropical forest recovery can occur over 50–100 years if seed banks and soil are preserved — basis for reforestation strategies
Carbon sequestration: NPP of tropical rainforests is the highest on land; their destruction reduces the planetary carbon sink, contributing directly to atmospheric $CO_{2}$ rise
Eutrophication and phosphorus: Agricultural runoff adds phosphorus to water bodies, stimulating algal blooms (eutrophication); phosphorus has no atmospheric dilution reservoir (no gaseous phase), making its accumulation in water bodies persistent
Climate change and dormancy disruption: Warming winters are causing premature termination of hibernation in bears and disrupting diapause timing in zooplankton, mismatching predator–prey phenologies (ecological mismatch theory)
10% law and food security: Eating lower in the food chain (plant-based diets vs. meat) is ~10× more energetically efficient — a direct application of Lindeman's 10% law to human food systems and land use
Wetland succession and hydrosere: Unchecked succession in constructed wetlands (sewage treatment, storm water management) can reduce water-holding capacity, requiring active management to arrest succession at reed-swamp stage
Ecological pyramids in fisheries: Inverted aquatic biomass pyramids explain why large fish populations can be sustained by small phytoplankton standing crops — important for understanding sustainable fishing limits