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Cannibalism

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Cannibalism

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Cannibalism

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Work out the food web in your classroom.

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NGATA |  FRESHWATER SNAIL

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When organisms die, nutrients and energy contribute to detritus, helping to complete the recycling of both.

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HUAKITA | BACTERIA

Break down detritus

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TOENGA WHAKAPOPO | DETRITUS
(dead stuff)

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| MACROPHYTES
(water plants - multiple species)

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The orange colour indicates the most important axis of the web. The thickness of the arrows indicates their relative contribution. The semi-circular arrow associated with kōura indicates cannibalism - a large part of mortality in kōura, especially among males.

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Is there only one human, one trout, one zooplankton etc. in the Lake? What do you think this means about the pictures here, do they represent one or a population (group) of that species?

Why is there nothing above humans in the food web?

Do all animals eat the same number of different things? What about the same mass of things? Why, why not? (see the 'advanced' food web at the bottom of this page)

Catfish and kōura have arrows pointing both ways between them, what might this mean?

Do phytoplankton and macrophytes eat the sun? If not, how do they get their energy from it?

Does something at the top of the food web eat everything below it? E.g. do humans eat zooplankton?

Can you think of any other ways that these species may interact? (Examples include: competition, helping eachother, being parasites...)

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Arrows point in the direction of energy transfer (usually by one thing eating another!). Watch this crash course for an introduction to food webs.

Text u nderlined links to more information about that species or word. This food web is not every thing in the  Lake, but is representative.

Species: a group of similar living things that ranks below the genus in scientific classification and is made up of individuals able to produce offspring with one another.

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CATFISH

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TANGATA | HUMAN

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KĀKAHI | FRESHWATER MUSSEL

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TAIORA  | NUTRIENTS

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RᾹ  | SUN

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SHAG
(multiple species)

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CATFISH

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PARAKI/PŌROHE | SMELT

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MEROITI TIPU | PHYTOPLANKTON
(tiny floating plants or algae - multiple species)

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MEROITI IKA | ZOOPLANKTON
(tiny floating animals - multiple species)

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TARAUTE | RAINBOW TROUT

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KŌARO

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KŌURA | FRESHWATER CRAYFISH

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TOITOI | COMMON BULLY

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The Noun Project - icon
Ned Barraud (shag, koura, koaro)
Sonia Frimmel
James Barnett (zooplankton, phytoplankton, macrophyte)
Freepik (sun)
Dennis Poole (kakahi)
Getdrawings.com (Fly fisher silhouette)
Maňas M. (2014) CC BY 4.0 [edited]  (snail)

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MORIHANA | GOLDFISH