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Topic: Food web

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  Food chain - Wikipedia, the free encyclopedia
Food chains and food webs or food networks describe the feeding relationships between species in a biotic community.
As usually diagrammed, an organism is connected to another organism for which it is a source of food energy and material by an arrow representing the direction of biomass transfer.
Food sources of most species in an ecosystem are much more diverse, resulting in a complex web of relationships as shown in the figure on the right.
en.wikipedia.org /wiki/Food_web   (489 words)

 Oceanic Food Webs   (Site not responding. Last check: 2007-11-07)
The position that a particular organisms occupies in a food web (or food chain) is known as its trophic level.
Food webs usually place the autotrophs at the bottom and the predators at the top in a depiction called a trophic pyramid.
Besides utilizing dissolved organic matter and shunting it into the food web, the bacterioplankton function as decomposers, breaking down organic matter and liberating compounds and elements that are important to the growth of phytoplankton.
www.oceansonline.com /oceanicfoodwebs.htm   (5278 words)

 MSN Encarta - Food Web
Food Web, set of interconnected food chains by which energy and materials circulate within an ecosystem (see Ecology).
Like a food chain, the original source of all the energy in a food web is the Sun.
In some food webs materials pass from plant and animal matter to bacteria and fungi (decomposers), then to detrital feeders (detritivores), and then to their predators (carnivores).
uk.encarta.msn.com /encyclopedia_761557485/Food_Web.html   (434 words)

 MSN Encarta - Food Web
The food web is divided into two broad categories: the grazing web, which typically begins with green plants, algae, or photosynthesizing plankton, and the detrital web, which begins with organic debris.
In a detrital web, materials pass from plant and animal matter to bacteria and fungi (decomposers), then to detrital feeders (detritivores), and then to their predators (carnivores).
For example, the fungi that decompose matter in a detrital web may sprout mushrooms that are consumed by squirrels, mice, and deer in a grazing web.
encarta.msn.com /encnet/refpages/RefArticle.aspx?refid=761557485   (515 words)

 Quantitative Food Webs - CPB Community Ecology Group   (Site not responding. Last check: 2007-11-07)
Quantitative food webs are descriptions of communities of interacting species in which the population densities of hosts and parasitoids are expressed in the same units, i.e.
Quantitative food webs can be interesting in their own right as descriptions of particular communities but this is not all there is to them.
The properties of a food web, the community structure, can be described by a number of parameters such as the relative number of species at different trophic levels, the average number of links per species, the distribution of these links, the distribution of the abundances of species (e.g.
www.cpb.bio.ic.ac.uk /communityecology/foodwebs.html   (335 words)

 4(e) Food Chain as an Example of a System
In this diagram, we begin the food chain with 100,000 units of light energy from the sun.
In the food chain model, the parts are the sun, plants, herbivores and carnivores.
The structure within the food chain is defined by the functional relationships between the elements and attributes of the system.
www.physicalgeography.net /fundamentals/4e.html   (858 words)

 Lower Food Web
The lower food web includes the benthic (plants and animals that live at the bottom of the Bay) and the plankton (free-floating plants and animals that inhabit the water column) communities.
Benthic organisms are members of the lower food web that have adapted to life on the bottom.
Members of the entire lower food web, both the plankton and benthic communities, are important indicators of the health of the Chesapeake Bay.
www.chesapeakebay.net /info/foodweb.cfm   (384 words)

 food web
Depending on the community, these webs may be relatively simple (approximating what used to called "food chains") or incredibly complex, as in coral reefs and tropical rainforests.
Also, since real food webs are dynamic structures, specific details of a general food web will vary from place to place, from season to season, and as individual organisms grow and pass through their life cycles, changing their own food preferences and their risks of being consumed by other species.
By convention, members of food webs are connected by arrows that point from the consumed to the consumer.
research.amnh.org /biodiversity/crisis/foodweb.html   (1199 words)

Then opposing players will make a change to the food web and all the players will see the effect that the change has on the ecosystem.
The winning player is the one who can cause their opponent's food web to crash before their own web crashes.
In this version of the game, the food webs will be restricted to terrestrial (land) organisms.
www.mastep.sjsu.edu /lessons/webgame/home.html   (337 words)

 Food web
The main objective of the research of the Department of Food Web Studies is toexplain the structure and dynamics of communities in lakes and reservoirs in...
The Arctic food web that man uses in subsistence existence and that naturalistsappreciate, is supported by a complicated interplay of biology and physics,...
Since the food web is a map of the feeding interactions in a community,...
paymentorder.com /food-web.html   (993 words)

 Food Web Theory   (Site not responding. Last check: 2007-11-07)
Applying a simple set of rules to a new food web model, the researchers revealed deep similarities between highly diverse ecosystems, suggesting the rules could be generalized.
To test their theory, the researchers selected seven of the most complex food webs available in the literature, representing an array of ecosystems—from estuaries and deserts to lakes and islands.
What sets the “niche model” apart from current models of food web organization, say the researchers, is its ability to accurately predict a set of 12 characteristics, such as the length of food chains, the number of omnivores and cannibals, the distribution of specialists and generalists, and the vulnerability of species within each food web.
rtc.sfsu.edu /press_releases/food_web_theory.htm   (796 words)

 food web   (Site not responding. Last check: 2007-11-07)
Food webs also include plants that are eaten by animals.
Ask students what a web looks like (it has branches and does not follow one path like a chain does, different levels are interconnected).
The class will assemble a large food web based on their research by placing the cards on poster board.
www.yourexpedition.com /education_site/lessons/food_web.html   (434 words)

 Study unearths cliques in the food web
This appears also to be the case for food web compartments in ecology, and this method identifies compartments in which interactions are concentrated," said research team member Ken Frank, an MSU associate professor jointly appointed in counseling, educational psychology and special education and fisheries and wildlife.
A common approach of understanding how species interact in food webs is to categorize them into hierarchical levels, where groups of species with similar food resources and predators are associated with each other.
The one-level concept alone, however, provides an incomplete understanding of food webs, because it only provides one view of the picture; it looks at which species are competitors, but not at the other associations that species make in the food web.
www.eurekalert.org /pub_releases/2003-11/msu-suc111803.php   (719 words)

 Food Webs
A food web is a model that shows all the possible feeding relationships between organisms living in an ecosystem.
A food web is actually several food chains joined together.
When you learned about food chains, you learned that organisms, can be classified as producers; first, second, or third order consumers; or decomposers.
www.usoe.k12.ut.us /curr/science/sciber00/8th/energy/sciber/foodweb.htm   (279 words)

 BLM NSTC Soil Biological Communities - Food Web
The soil food web is a simple way of referring to the functions of the soil biological community.
Soil Economics 101: Plants, algae, cyanobacteria, lichens, bryophytes, and photosynthetic bacteria use the sun’s energy to fix atmospheric carbon to sugar form and are the primary producers that fuel the food web.
Soil food webs are wonderful in their complexity.
www.blm.gov /nstc/soil/foodweb   (551 words)

 Forest Food Web Activity   (Site not responding. Last check: 2007-11-07)
Students will be introduced to food webs and ecological interconnections in the forest, and place different life forms in their proper place in a food chain.
Have students draw a food web based on plants and animals seen during their trip to RBG.
Compare a forest food web and ecosystem to that of another natural region e.g.
www.rbg.ca /kids/habitats_post1.html   (219 words)

 food web text
Food Chains, Webs, and the Cybernetic Ecosystem (PDF VERSION IS A food chain describes how energy and nutrients move through an ecosystem (Figure 1).
One reason ecologists are interested in food webs is the apparent relationship between stability of an ecosystem and its complexity.
Modeling food webs is going to require a different approach from that we've used for our two-species interactions, in part because we need to model a greater number of species, but also because we need a way to apply all of the potential species interactions (Table 2).
cas.bellarmine.edu /tietjen/Pop_Models/food_web_text.htm   (2528 words)

 The Marine Food Web
By sheer biomass and their trophic position, copepods are the crucial link between the primary producers and the rest of the ocean food web.
Because menhaden are the food of choice for species all the way up the food ladder to apex predators, they are popular bait fish.
When all is said and done, that tuna steak on the dinner plate culminates a web of interdependencies that passes sustenance from a one-celled plant all the way up to the most complex organisms on Earth.
seagrant.gso.uri.edu /factsheets/foodweb.html   (899 words)

 JASON Digital Lab: Earth Systems: Food Web
Food chains can have as few as one link, or as many as six.
The food web consists of the transfer of energy from one species to another.
The true complexity of these energy transfers is shown in a food web.
www.jasonproject.org /digital_labs/earthsystems/food/foodweb2.html   (264 words)

 Environmental Biology Sequence - Ecosystems
Note that even though I said the food chain is the path of food from a given final consumer back to a producer we typically list a food chain from producer on the left (or at the bottom) to final consumer on the right (or at the top).
The food webs you see here are grazing food chains since at their base are producers which the herbivores then graze on.
In detritus-based food chains, decomposers are at the base of the food chain, and sustain the carnivores which feed on them.
www.marietta.edu /~biol/102/ecosystem.html   (5620 words)

 Food Web   (Site not responding. Last check: 2007-11-07)
These are also known as autotrophs, since they make their own food.
In the ocean food chain, the zooplankton eat the phytoplankton.
Thus, the oceanic food chain is has a low efficiency, since much energy is lost through the 3 to 6 levels of preditory transfer.
www.oc.nps.navy.mil /webmodules/ENSO/foodweb.html   (239 words)

 Introduction to Food Chains and Food Webs   (Site not responding. Last check: 2007-11-07)
To show the energy flow through a food chain by constructing model food chains and food webs with the given drawings of organisms.
Construct a food web as it would occur in the chaparral.
Take a dark colored pencil or canyon and mark all of the organisms in the food web that might get some of the poison into their bodies from their food.
www.lalc.k12.ca.us /uclasp/urban_science/food_chains/intro_chains.html   (467 words)

 Food Chains and Webs
When a herbivore eats, only a fraction of the energy (that it gets from the plant food) becomes new body mass; the rest of the energy is lost as waste or used up (by the herbivore as it moves).
There cannot be too many links in a single food chain because the animals at the end of the chain would not get enough food (and hence energy) to stay alive.
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.
www.vtaide.com /png/foodchains.htm   (598 words)

 Cooperative Lesson: Create a Food Web | Science Lesson Plan
Then, the large fish has the ball of wool and catches small fish and so on down the food chain until all are linked by the strand of wool.
When all the links have been established, man gathers up the ends of the wool of those large creatures that he eats (even if not in your culture, so that lion may be food for African man) and plant gathers up the strands of all those that eat something derived from plants.
What you should find is that Man stands at one end with a number of strands of wool, in the middle are all the creatures with strands of wool going every which way like a web, and plant at the other end holding all the strands.
www.teachnet.com /lesson/science/biology/foodchain111300.html   (494 words)

 Food Web
As one organisms eats another, a food chain is formed.
Each step along a food chain is known as a trophic level, and every organism can be categorized by its feeding or trophic level.
Usually, several food chains are interwoven together to form a food web.
www.chesapeakebay.net /ecoint6a.htm   (611 words)

 Arctic Food Web--Science: Grades 5-8   (Site not responding. Last check: 2007-11-07)
In the next part of a food chain, the consumer is eaten by another animal that is a carnivore, which is an animal that eats only meat, or an omnivore.
When food chains connect or overlap, it is called a food web.
If one part of the food web becomes extinct, the entire web may be affected, causing drastic consequences.
www.teachercreated.com /lessons/000901cs.shtml   (332 words)

 Food Web References (Miscellaneous)   (Site not responding. Last check: 2007-11-07)
Polis G.A. (1991) Complex desert food webs: An empirical critique of food web theory.
Waide R.B.& Reagan W.B. (eds.) (1996) The Food Web of a Tropical Rainforest.
Warren P.H. (1989) Spatial and temporal variation in the structure of a freshwater food web.
discuss.santafe.edu /paleofoodwebs/miscref   (608 words)

 Create a Food Chain, 3-5   (Site not responding. Last check: 2007-11-07)
Let's use paper to make a food chain in order to learn how all Earth's creatures and plants are linked to each other and to the sun.
Ask everyone to look carefully at their food chains and decide if the sun needs to be added to them.
Look carefully to see if any of the independent food chains can be linked together to create a food web.
www.sd5.k12.mt.us /glaciereft/foodch35.htm   (311 words)

 Oceanlink | marine sciences education and fun
A food web is a diagram illustrating the feeding relationships between the plants and animals in a certain area.
A true food web that considers all the plants and animals in a system is bound to be unweildy and confusing.
Consider the food web below: it only deals with the different foods that herring eat throughout their life stages.
www.oceanlink.island.net /oinfo/foodweb/foodweb.html   (146 words)

 Food Webs   (Site not responding. Last check: 2007-11-07)
Food Webs Kelly Ludwig Lincoln-Way High School 16621 Grants Trail Route #30 Orland Park IL 60462 New Lenox IL 60451 (708) 429-1005 (815) 485-7655 Objective: The main objective of this Mini-teach is to show students that a food web consists of many food chains put together.
Also, a food web shows the food relationship in a community.
Try not to get caught without a place in the food web for your organism.
www.iit.edu /~smile/bi9317.html   (280 words)

 Investigating a real food web
Your team decides the best plan of action is to create a food web that will help you and the township understand the relationships which exist among the plants and animals present in the woodlot.
Construct a food web that might exist in the Outdoor Education Laboratory with the red fox as top predator.
This web site explains what a food web is, defines relationships within it, and answers many of the questions about the components of a food web.
www.biopoint.com /traversecity/realfoodweb.htm   (1258 words)

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