IB Biology Topic C4.1 Populations and Communities (SL/HL) covers syllabus content as part of Topic C4: Ecosystems under Theme C: Interaction and Interdependence. Use these notes, questionbank, videos, flashcards, and lessons to review the topic, practise exam questions, and move between notes, videos, flashcards, and lessons where available.
C4.1 Populations and communities is part of Topic C4: Ecosystems under Theme C: Interaction and Interdependence.
What this topic covers
C4.1.1 Populations
C4.1.2 Estimation of population size by random sampling
C4.1.3 Random quadrat sampling to estimate population size for sessile organisms
C4.1.4 Capture–mark–release–recapture and the Lincoln index
C4.1.5 Carrying capacity and competition for limited resources
C4.1.6 Negative feedback control of population size by density-dependent factors
C4.1.7 Population growth curves
C4.1.8 Modelling of the sigmoid population growth curve
C4.1.9 Competition versus cooperation in intraspecific relationships
C4.1.10 A community as all of the interacting organisms in an ecosystem
C4.1.11 Herbivory, predation, interspecific competition, mutualism, parasitism and pathogenicity
C4.1.12 Mutualism as an interspecific relationship that benefits both species
C4.1.13 Resource competition between endemic and invasive species
C4.1.14 Tests for interspecific competition
C4.1.15 Use of the chi-squared test for association between two species
C4.1.16 Predator–prey relationships
C4.1.17 Top-down and bottom-up control of populations in communities
C4.1.18 Allelopathy and secretion of antibiotics