Search results
Results From The WOW.Com Content Network
In his 1966 paper, Food Web Complexity and Species Diversity, Paine had described such a system in Makah Bay in Washington. [4] In his 1969 paper, Paine proposed the keystone species concept, using Pisaster ochraceus, a species of starfish generally known as ochre starfish, and Mytilus californianus, a species of mussel, as a primary example. [1]
Many food chains and food webs contain a keystone species, a species that has a large impact on the surrounding environment and that can directly affect the food chain. If a keystone species is removed it can set the entire food chain off balance. [1] The efficiency of a food chain depends on the energy first consumed by the primary producers. [2]
A food web model is a network of food chains. Each food chain starts with a primary producer or autotroph, an organism, such as an alga or a plant, which is able to manufacture its own food. Next in the chain is an organism that feeds on the primary producer, and the chain continues in this way as a string of successive predators.
A freshwater aquatic food web. The blue arrows show a complete food chain (algae → daphnia → gizzard shad → largemouth bass → great blue heron). A food web is the natural interconnection of food chains and a graphical representation of what-eats-what in an ecological community.
An apex predator, also known as a top predator or superpredator, is a predator [a] at the top of a food chain, without natural predators of its own. [6] [7] Apex predators are usually defined in terms of trophic dynamics, meaning that they occupy the highest trophic levels.
Employees of a flagship Whole Foods Market in Philadelphia voted to become the first unionized store in the Amazon-owned grocery chain's history. United Food and Commercial Workers Local 1776 ...
Trophic cascades are powerful indirect interactions that can control entire ecosystems, occurring when a trophic level in a food web is suppressed. For example, a top-down cascade will occur if predators are effective enough in predation to reduce the abundance, or alter the behavior of their prey, thereby releasing the next lower trophic level from predation (or herbivory if the intermediate ...
Tyson Foods announced Monday that it would buy Keystone Foods in a $2.16 billion deal. Tyson, which is the largest U.S. meat supplier by sales, will expand its range of products and have a larger ...