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Useful interactions with molluscs range from their use as food, where species as diverse as snails and squid are eaten in many countries, to the employment of molluscs as shell money and to make dyestuffs and musical instruments, for personal adornment with seashells, pearls, or mother-of-pearl, as items to be collected, as fictionalised sea ...
These kinds of interactions have been studied and modeled by population ecologists for nearly a century. [2] [3] Species at the bottom of the food chain, such as algae and other autotrophs, consume non-biological resources, such as minerals and nutrients of various kinds, and they derive their energy from light or chemical sources. Species ...
The ocelot is listed as Least Concern on the IUCN Red List and is threatened by habitat destruction, hunting, and traffic accidents. While its range is very large, various populations are decreasing in many parts of its range. The association of the ocelot with humans dates back to the Aztec and Incan civilizations; it has occasionally been ...
Food chain in a Swedish lake. Osprey feed on northern pike, which in turn feed on perch which eat bleak which eat crustaceans.. A food chain is a linear network of links in a food web, often starting with an autotroph (such as grass or algae), also called a producer, and typically ending at an apex predator (such as grizzly bears or killer whales), detritivore (such as earthworms and woodlice ...
Social sciences including anthropology, ethnography, and archaeology have long investigated human interactions with living things. Anthropology and ethnography have traditionally studied these interactions in two opposed ways: as physical resources that humans used; [3] and as symbols or concepts through totemism and animism. [5]
In these systems, humans mainly eat predatory fish and have a fractional trophic level of 4.65 and 4.5, respectively, which in Roopnarine's view makes those humans apex predators. [b] [30] In 2021, Miki Ben-Dor and colleagues compared human biology to that of animals at various trophic levels.
Food webs provide a framework within which a complex network of predator–prey interactions can be organised. 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 ...
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.