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Listed under:  Ecosystems  >  Food webs  >  Food chains  >  Producers (Food chains)
Image

Concept cartoon: producers

This image is a concept cartoon. It shows a boy and a girl discussing food chains. One character is stating that producers are always at the start of a food chain, while the other character is refuting this. The cartoon is intended as a stimulus for further discussion of the concept.

Video

Understanding food webs

This is a colour video clip in which ecologist Associate Professor Stephen Wing of the University of Otago talks about the importance of understanding food webs, particularly in marine ecosystems. He gives examples of how such understanding has been applied in Fiordland, New Zealand. Still images shown include marine organisms, ...

Image

Tuna sandwich trophic pyramid

This image is a diagram known as a trophic pyramid. This example shows the levels of an ecosystem that support the growth of tuna, which might be consumed by a human in a tuna sandwich. The diagram shows six levels in the 'pyramid' from phytoplankton through to humans, and visually depicts the size of the biomass at each ...

Interactive

Experiment with ecosystems

This interactive learning activity consists of a series of virtual ecosystem models for exploring the interrelationships within food webs. Students can complete two experiments to test hypotheses about producer-consumer and predator-prey relationships. The activity is supported by a 'Lab book' in which students can view ...

Interactive

Predators and prey

This interactive learning activity consists of a virtual ecosystem model for exploring the selective advantage that coat colour can give to rabbits, and the significance of this to predator-prey relationships. Students can complete two experiments to investigate predator-prey relationships. The activity is supported by ...

Interactive

The virtual ecosystem

This interactive learning activity consists of a virtual ecosystem model that introduces the idea that all living things compete for food. Students can complete two game-like experiments to investigate the need an individual rabbit has for grass and then compare the needs of an individual rabbit to the needs of a population ...

Image

Marine trophic pyramid

This image displays a type of diagram known as a trophic (or ecological) pyramid. This example depicts the organisms and the matter and energy flows in a typical marine ecosystem. The diagram shows six levels of organisms from primary producers through to the top carnivores, arranged in a pyramid. Also represented is the ...

Image

Simple ecosystem diagram

This is a colour graphic representing the energy and nutrient flow in a simple food chain. The Sun and organisms making up the food chain are represented in diagrammatic form. The graphic is labelled and a key to the colour-coding of energy and nutrient flows is included.