Biology › Ecology, populations and environmental change

Ecology, populations and environmental change

Unit B20 · 3 lessons published so far.

• Populations and their limits: what stops the numbers rising
  Population, community and habitat as separate terms; the sigmoid growth curve and its lag, log, slowing and stationary phases; carrying capacity…
• Nutrient cycles: nitrogen, phosphorus and eutrophication
  Why nitrogen matters and why nitrogen gas is useless to plants; the four bacterial processes of the nitrogen cycle, which are nitrogen fixation…
• Succession: how bare rock becomes woodland, and why we stop it
  Primary and secondary succession; pioneer species and the changes they make to the abiotic environment; seral stages and the climax community; how…

Practical work that lands here

• Field sampling, distribution and behavioural response