Food chain in a Swedish lake. Osprey feed on northern pike, which in turn feed on perch which eat bleak that feed on freshwater shrimp. A food chain is a linear sequence of links in a food web starting from a trophic species that eats no other species in the web and ends at a trophic species that is eaten by no other species in the web. A food chain differs from a food web, because the complex polyphagous network of feeding relations are aggregated into trophic species and the chain only follows linear monophagous pathways.
A common metric used to quantify food web trophic structure is food chain length. In its simplest form, the length of a chain is the number of links between a trophic consumer and the base of the web and the mean chain length of an entire web is the arithmetic average of the lengths of all chains in a food web. Food chains were first introduced by the African-Arab scientist and philosopher Al-Jahiz in the 9th century and later popularized in a book published in 1927 by Charles Elton, which also introduced the food web concept. Food chain length
Food chains are directionaling paths of trophic energy or, equivalently, sequences of links that start with basal species, such as producers or fine organic matter, and end with consumer organisms. :370
The food chain length is a continuous variable that provides a measure of the passage of energy and an index of ecological structure that increases in value counting progressively through the linkages in a linear fashion from the lowest to the highest trophic (feeding) levels. Food chains are often used in ecological modeling (such as a three species food chain). They are simplified abstractions of real food webs, but complex in their dynamics and mathematical implications. Ecologists have formulated and tested hypotheses regarding the nature of ecological patterns associated with food chain length, such as increasing length increasing with ecosystem size, reduction of energy at each successive level, or the proposition that long food chain lengths are unstable.
Food chain studies have had an important role in ecotoxicology studies tracing the pathways and biomagnification of environmental contaminants. Food chain vary in length from three to six or more levels. A food chain consisting of a flower, a frog, a snake and an owl consists of four levels; whereas a food chain consisting of grass, a grasshopper, a rat, a snake and finally a hawk consists of five levels. Producers, such as plants, are organisms that utilize solar energy or heat energy to synthesise starch. All food chains must start with a producer. Consumers are organisms that eat other organisms. All organisms in a food chain, except the first organism, are consumers.
Food chains Importance:
Food chains and webs ensure that one particular species cannot become too large and therefore destroy the species it feeds on, creating a massive inbalance. This means that every creature has a predator and/or environmental threats so their population cannot increase to an amount that is unhealthy for the surounding ecosystem.
A Food chain Example :
This food chain begins with Kelp and seaweed . Krill eats kelp that is in the bottom of the food chain , then it gets eaten by mackreel and herrings. The killer whale is at the top of the food chain that means no animal can eat it. It eats squid , octopus , seal and mackreel . Tuna is good to eat by humans . Kelp , mackreel , octopus , killer whale , red algae , krill , squid , tuna , anchovy , seal , sea lion and herring are linked together in one food chain .
And here are some random other examples for food chains :
There are a lot of food chains you can form.
1. corn –> chick —> snake —-> man
2. rice –> rat —> owl
3. grass –> earthworms –> bird –> snake
4. grass —> cow —> man
5. grass —> deer –> eagle
6. carrots —> rabbit –> snake –> eagle
7. weeds —> zebra –> lion –>coyote
8. grass –> antelope –> tiger –> vulture
9. weeds —> elephants –> vulture
10. nuts –> squirrels –> hawk
11. leaves —> giraffes —> lion
12. leaves –> caterpillar –> birds –> snake
13. leaves —> ants –> anteaters
14. fruits –> monkeys –> monkey-eating eagle
15. fruits –> bats —> eagles