IBDP Biology Chapter 14 Notes
ecology and conservation
STUDY NOTES FOR BIOLOGY CHAPTER 14 – ECOLOGY AND CONSERVATION
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This unit revolves around the ecosystem, its population and conservation. We start by defining species, population and community. We also discuss Shelford’s Law of tolerance which determines the distribution of species according to their tolerance. Then we examine the disproportionate importance of keystone species in maintaining an ecological community and ecological niches influencing competition between species.
We also ponder the inter-species interactions (like herbivory, predation, parasitism, mutualism and commensalism. We then reexamine the pyramid of energy and how biomass and energy get lost every time they are transferred. We also learn about the FCR, i.e. the Food conversion Ratio( lower FCR= higher efficiency). Primary succession occurs when no life existed, and secondary succession occurs on land with already fertile soil. Then we learn the representation of nutrient stores (soil, biomass and litter) through Gresmehl diagrams.
Alternatively, we also learn about the impacts of humans on ecosystems through alien species which become invasive. We also dive into biomagnification because toxic substances (insecticides like DDT) accumulate at higher trophic levels. Then we deal with the impact of macroscopic and microscopic(<5mm) plastics. Conservation of biodiversity has two components, richness and evenness, and can be of two types, ex-situ or in situ. Population ecology deals with population dynamics and population growth curve. Then we end the unit with nitrogen and phosphorous cycle and the effects of eutrophication.
- Chapter 1 Cell
- Chapter 2 Molecular Biology
- Chapter 3 Genetics
- Chapter 4 Ecology
- Chapter 5 Evolution and biodiversity
- Chapter 6 Human Physiology
- Chapter 7 Nucleic Acids
- Chapter 8 Metabolism, cell respiration and photosynthesis
- Chapter 9 Plant Biology
- Chapter 10 Genetics and evolution
- Chapter 11 Animal Physiology
- Chapter 12 Biotechnology and bioinformatics
- Chapter 13 Neurobiology and behaviour
- Chapter 14 Ecology and conservation
- Chapter 15 Human Physiology