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    • 1. Cell biology >
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  • Additional higher level (AHL)
    • 7. Nucleic acids >
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      • C.1 Species and communities
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      • C.5 Population ecology (AHL)
      • C.6 Nitrogen and phosphorus cycles (AHL)
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  • BISV Revision
  • Giving back - BioKQQAnswers

Essential idea: Dynamic biological processes impact population density and population growth.

Fish populations, such as the schooling Anchovies (left) being hunted by the Bluefin Trevally (right) are an excellent example of how dynamic populations are. The process affecting population density here is mortality caused by predation.

Understandings, Applications and Skills

C.5.U1 Sampling techniques are used to estimate population size.
C.5.U2 The exponential growth pattern occurs in an ideal, unlimited environment.
C.5.U3 Population growth slows as a population reaches the carrying capacity of the environment.
C.5.U4 The phases shown in the sigmoid curve can be explained by relative rates of natality, mortality, immigration and emigration.
C.5.U5 Limiting factors can be top down or bottom up.
C.5.A1 Evaluating the methods used to estimate the size of commercial stock of marine resources.
C.5.A2 Use of the capture-mark-release-recapture method to estimate the population size of an animal species.
C.5.A3 Discussion of the effect of natality, mortality, immigration and emigration on population size.
C.5.A4 Analysis of the effect of population size, age and reproductive status on sustainable fishing practices.
C.5.A5 Bottom-up control of algal blooms by shortage of nutrients and top-down control by herbivory.
C.5.S1 Modelling the growth curve using a simple organism such as yeast or species of Lemna.
[Text in square brackets indicates guidance notes]

Presentation and notes

The presentation is designed to help your understanding. The notes outline is intended to be used as a framework for the development of student notes to aid revision.


Vocabulary

Correct use of terminology is a key skill in Biology. It is essential to use key terms correctly when communicating your understanding, particularly in assessments. Use the quizlet flashcards or other tools such as learn, scatter, space race, speller and test to help you master the vocabulary.


Quick quiz

Quick quiz Use the BioK Quick Quiz on C.5 Population Ecology (as directed) to check your understanding of the topic.

Weblinks

Population growth curves
Population size, Population growth and Factors limiting population growth by Click4Biology
Exponential population growth by The Biology Project

Managing fish populations
End overfishing by Blackfish
_Dan Barber: How I fell in love with a fish by TED
Sustainable fisheries by MarineBio
Scientific advice on managing fish stocks by European Commission

Algal blooms and eutrophication
Eutrophication by Absorb Learning
Lake eutrophication by Minneapolis Public Schools

Capture-Mark-Release-Recapture
Mark and recapture by Biology Corner

Nature of Science

Avoiding bias—a random number generator helps to ensure population sampling is free from bias. (5.4) [covered in C.5.A2 and C.5.S1]

International-mindedness

The issues around the growing global human population are of international concern regardless of different growth rates in different countries.
Hans Rosling talks about global population by using boxes
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