The term food chain refers to the sequence of events in an ecosystem, where one organism eats another and then is eaten by another organism. It starts with the primary source, like the sun or hydrothermal vents, where producers make food, continues with consumers, or animals who eat the food, and ends with the top predator.

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Over a third of all recalls for food products in the United States occur due to an undeclared allergen. In these situations, a food product is often mislabeled or contaminated in some way, resulting in the unknown presence of allergen. For food-allergic consumers, a company's mistake can become life-threatening. By investigating data from the Food and Drug Administration, I found that. Food chains can get complicated because animals usually eat a variety of food. Most animals are part of more than one food chain and eat more than one kind of food in order to meet their food and energy requirements. When many food chains weave together, they create a food web.

Examples of Food Chains

Here, we have brought together a collection of examples of food chains for you to study. Food chains are the basic unit of any ecosystem, connecting with one another to form the food webs that map the interactions of life on Earth.

Food Chains on Land

Land-based food chains represent the most familiar forms of nature to humans. Everything ultimately derives its energy from the sun, and most food chains follow the pattern 'herbivore, carnivore, maybe another carnivore or two, apex predator.' But there is an almost endless diversity within that pattern and even a few chains that break it.

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One fascinating break in that pattern is the omnipresent decomposer. Organisms ranging from bacteria and maggots to the noble cockroach feed on the dead, and in doing so break them down into the nutrients that keep the food chain going. By eating and excreting, decomposers return the nutrients of dead organisms to the soil, which nourishes the plants that start the chains all over again.

  • Nectar (flowers) - butterflies - small birds - foxes
  • Dandelions - snail - frog - bird - fox
  • Dead plants - centipede - robin - raccoon
  • Decayed plants - worms - birds - eagles
  • Fruits - tapir - jaguar
  • Fruits - monkeys - monkey-eating eagle
  • Grass - antelope - tiger - vulture
  • Grass - cow - man - maggot
  • Grass - grasshopper - frog - snake - eagle
  • Hazel tree - wood mouse - tawny owl
  • Herring - salmon - bear
  • Juniper berries - rabbit - fox
  • Leaves - ants - anteaters
  • Leaves - caterpillars - birds - snakes
  • Leaves - giraffes - lions - jackals
  • Nuts - squirrels - hawks
  • Plants - mice - badgers - bobcats
  • Plants - mule deer - mountain lion
  • Rice - rat - owl
  • Sun - berries - bear - bacteria
  • Sun - grass - ant - echidna - dingo
  • Sagebrush - elk - wolf
  • Switchgrass - earthworm - quail - hawk
  • Willow shoots - musk oxen - wolves

Food Chains in Water

Aquatic food chains are where things get interesting. Much of the ocean remains unexplored, and food chains in water-based environments are often complex and surprising to us land-dwellers. The most famous example is chemosynthesis, which we'll cover later. But even the aquatic food chains that follow expected patterns can be fascinating.

Decomposers play a crucial role here too, as aquatic decomposers distribute nutrients not just into the soil, but throughout the water column, feeding the plankton that form the base of all aquatic food chains.

  • Algae - otocinclus catfish - osprey
  • Algae - mosquito larvae - dragonfly larvae - fish - raccoons
  • Crayfish - catfish - humans
  • Insect - fish - humans
  • Mayflies - trout - humans
  • Phytoplankton - copepod - fish - squid - seal - orca - brittle star
  • Phytoplankton - copepod - bluefish - swordfish - human
  • Phytoplankton - copepod - bluehead wrasse - striper - sea cucumber
  • Phytoplankton - zooplankton - anchovy - tuna - humans
  • Phytoplankton - zooplankton - fish - seal - great white shark
  • Phytoplankton - zooplankton - herring - harbor seal
  • Plankton - shrimp - herring - cat
  • Plankton - snail - mackerel - shark
  • Plankton - snail - tuna - dolphin
  • Plankton - threadfin shad - bass - humans
  • Seaweed - periwinkle - ragworm - curlew
  • Caterpillars - turtles - alligators - humans
  • Watercress - mayfly larva - stickleback

Chemosynthetic Food Chains

Until the 1970s, it was accepted scientific fact that all energy on Earth comes from the sun. Every food chain was based on plants turning sunlight into energy. Then, deep-sea submersibles discovered whole ecosystems that existed in the darkest depths of the ocean.

There, microbes that never saw the sun derived nutrients from compounds vented into the water from deep in the Earth's crust and produced chemicals that supported whole new food webs never dreamt of on the surface. That's chemosynthesis. Here are some examples.

  • Bacteria - clams - octopus
  • Bacteria - copepods - shrimp - zoarcid fish
  • Bacteria - tubeworms - zoarcid fish
  • Microbes - ridgeia tubeworms - spider crab - octopus
  • Microbes - shrimp - crabs
  • Mussels - brachyuran crabs - octopus
  • Mussels - shrimp - anemone
  • Tubeworms - crabs - shrimp - zoarcid fish

The Circle of Life

All plants and animals are part of a food chain. These examples of food chains are only a small part of the vast food webs that span our world. They simply represent the variety of plants and animals, and the complexity of interactions, that make up the amazing diversity of life on Earth.

Now you've learned about life on Earth, read up about the landforms that make up the Earth's surface.

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Last week, Oklahoma State Senator Ralph Shortey introduced a bill that would ban 'the manufacture or sale of food or products which use aborted human fetuses.' But which foods or products use aborted human fetuses? Let's investigate.

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NPR speculates that Shortey's bill has to do with a recent boycott aimed at PepsiCo for working with a company called Senomyx that 'has been accused of using proteins derived from human embryonic kidney cells in its research.' Quoth Shortey:

The senator says that his research shows there are companies in the food industry that have used human stem cells to help them research and develop products, including artificial flavorings.

'I don't know if it is happening in Oklahoma, it may be, it may not be. What I am saying is that if it does happen then we are not going to allow it to manufacture here,' Shortey tells KRMG's Nicole Burgin.

As an impartial journalistic outlet, we're not here to tell you that Ralph Shortey is an utter moron whose incompetent attempts to ban stem cell-derived medicine reveal his all-encompassing idiocy, nor to tell you that the use of aborted human fetuses in food would already be in clear violation of a variety of different federal and state laws. Nor, for that matter, are we here to tell you that you should or should not be eating aborted human fetuses. What we are here to do is find out what foods are made using aborted human fetuses. We've contacted a number of the country's largest food companies and asked: do you use aborted human fetuses in your food products?

Companies That Do Not Use Aborted Human Fetuses in Their Food Products

McDonald's

Products include:Big Macs, Chicken McNuggets, Filet o' Fish, McRib, McChicken, McGriddle
Contains aborted human fetuses? Ashlee Yingling, media relations: 'The answer is no. McDonald's does not use aborted human fetuses in its food.'

Nestlé

Products include:Perrier, Häagen-Dazs, Gerber, Powerbar, DiGiorno Pizza, Butterfinger, Kit Kat, Alpo, Frisky
Contains aborted human fetuses? Hilary Green, head of R&D communications: 'Nestlé does not use aborted human fetuses in its food products.'

PepsiCo

Products include:Pepsi, Diet Pepsi, Tropicana Orange Juice, Doritos, Quaker Oatmeal, Mountain Dew, Fritos, Gatorade
Contains aborted human fetuses? In a letter to 'Children of God for Life,' PepsiCo consumer relations representative Margaret Corsi writes: 'These claims are meant to suggest that human fetal tissue is somehow used in our research. That is both inaccurate and something we would never do or even consider. It also is inaccurate to suggest that tissue or cells somehow are being used as product ingredients. That's dangerous, unethical and against the law.'

Wendy's (UPDATED)

Products include:Dave's Hot 'n Juicy 1/4 lb. Single, Bacon Deluxe Single, Bacon Deluxe Double, Frosty
Contains aborted human fetuses? Kitty Munger, director, communications: 'We'd like to correct the mention of Wendy's on gawker, relative to the issue of human fetuses. The answer is absolutely no. Wendy's does not use aborted human fetuses in its food.'

Companies That Might Use Aborted Human Fetuses in Their Food Products

Burger King

Products include:WHOPPER®, WHOPPER JR.®, Chicken Tenders, BK® Chicken Fries, Bacon & Cheddar BK TOPPERS™ Burger
Contains aborted human fetuses?Possibly. Burger King has not responded to our request for comment at this time.

General Mills

Products include:Cheerios, Cinnamon Toast Crunch, Bisquick, Fruit by the Foot, Bugles, Chex Mix, Hamburger Helper
Contains aborted human fetuses?Possibly. General Mills has not responded to our request for comment at this time.

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Kraft

Products include:A-1 Steak Sauce, Boca Burgers, Capri Sun, Crystal Light, Jell-O, Lunchables, Oreos, Teddy Grahams, Wheat Thins
Contains aborted human fetuses?Possibly. Kraft has not responded to our request for comment at this time.

Coca-Cola

Products include:Coca-Cola, Diet Coke, Coke Zero, Sprite, Zico
Contains aborted human fetuses?Possibly. Coca-Cola has not responded to our request for comment at this time.

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Image by Jim Cooke; stock photo via Shutterstock