A social science view of Gaia theory is the role of humans as a keystone species who may be able to accomplish global homeostasis.

The company's world headquarters are in Pittsburgh, Pennsylvania, where the company has been located since 1890, and the company's " keystone " logo is based on that of Pennsylvania, the " keystone state ".

It is a keystone species, playing an important role in stabilizing ecosystems and regulating the populations of the animals it hunts.

It is a " keystone species ", keeping its prey populations in balance so some do not outcompete the others and destroy the kelp in which they live.

The black-footed ferret is entirely dependent on another keystone species, the prairie dog.

It contains about 1, 000-2, 000 species of shrubs, herbs, and lianas, many of which are keystone species in their native habitat The diversification of this taxon is of interest to understanding the evolution of plants.

The keystone work of literature in Taoism is the Tao Te Ching, a concise and ambiguous book containing teachings attributed to Laozi ().

Venezuela is a major producer of petroleum products, which remain the keystone of the Venezuelan economy.

Gnawed stumps and beaver sign are now seen on Orcas and other islands, and recolonization by this keystone species is likely to lead to increased abundance and diversity of birds, amphibians, reptiles and plants.

Book IV of Gulliver's Travels is the keystone, in some ways, of the entire work, and critics have traditionally responded to the subject of whether Gulliver is insane ( and therefore just another victim of Swift's satire ) or not by questioning whether or not the Houyhnhnms are truly admirable.

The purpose of a secure cryptoprocessor is to act as the keystone of a security sub-system, eliminating the need to protect the rest of the sub-system with physical security measures.

The keystone of the heldentenor's repertoire is arguably Wagner's Siegfried, an extremely demanding role requiring a wide vocal range and great power, plus tremendous stamina and acting ability.

It is often the keystone food supply for frugivorous animals, such as birds, fruit bats, monkeys, opossums, and even fish.

Clave is a Spanish word meaning ' code ,' ' key ,' as in key to a mystery or puzzle, or ' keystone ,' the wedge-shaped stone in the center of an arch that ties the other stones together.

He is the keystone of the institutional device and of the Francophonie and leads the organization.

The beaver is a keystone species, increasing trout and bird biodiversity in its territory through creation of beaver ponds and wetlands.

This bypasses a single-arched bridge built in the late 1700s, which has a female head carved on the keystone of the western face, presumed to be the Kate after whom the bridge is named.

The bridge is largely composed of flint and has a large inverted scallop shell in the place of the keystone and similar shells in the spandrels at each side.

Between the spandrels is the keystone, on which there stands a female on the East side and a male on the West side.

The more common type is sometimes referred to as keystone, where the blade profile is slightly flared before tapering off at the end.

The intended keystone is Wikipedia-style collaboration and information sharing.

This article is the keystone of the treaty, and defines the principles from which most of the rest the treaty is derived, including the obligation to respect medical units and establishments ( Chapter III ), the personnel entrusted with the care of the wounded ( Chapter IV ), buildings and material ( Chapter V ), medical transports ( Chapter VI ), and the protective sign ( Chapter VII ).

The Cluniac order was a branch of the Benedictines and fell under the rule of the great abbey at Cluny in Burgundy ; the Benedictine order was a keystone to the stability that European society achieved in the 11th century, and partly owing to the stricter adherence to a reformed Benedictine rule, Cluny became the acknowledged leader of western monasticism from the later 10th century.

* The loss of keystone species, often a top predator, causing smaller carnivores to proliferate, very often overstressing herbivore populations ;

Tinbergen is also well known for his four questions that he believed ethologists should be asking about any given animal behavior ; among these is that of the mechanism of the behavior, on a physiological, neural and molecular level, and this question can be thought of in many regards as the keystone question in neuroethology.

The Randstad is the keystone of the Dutch railway network ; most intercity connections terminate in one of the key cities in the Randstad.

There are 28 departments ( 18 clinical departments included ); 3 Clinical Teaching Hospitals: The First Affiliated Hospital, The Second Affiliated Hospital and The Affiliated Dental Hospital ; 6 centers ( Biological Medicine R & E Center, Long-Distance Medicine Center, All-Division Medicine Center, Medical Information Center, Animal Experimentation Center and Medical Testing and Training Center ); 27 Graduate Schools ; 1 keystone lab belonging to Ministry of Education, 2 keystone labs belonging to Ministry of Health and 3 keystone labs at Provincial level ; 2 keystone subjects as Physiology and Medical Jurisprudence at State level and another 7 keystone subjects at Provincial level.

If beer is leaking around the tap then hammering it further in will normally fix the problem ; otherwise the keystone itself may be split or the tap may be faulty and the offending item will need to be changed.

The sign as originally conceived by Officer Riggs was shaped like a keystone ; later versions bore the shape of an inverted equilateral triangle which has been almost universally adopted.

A keystone of these efforts is the planet Reach, an interstellar naval yard and a hub of scientific and military activity.

Because of the rich diversity of life, most animal species along the Oregon coast depend on these keystone zones for survival.

Binary operations are the keystone of algebraic structures studied in abstract algebra: they form part of groups, monoids, semigroups, rings, and more.

Walruses are relatively long-lived, social animals, and they are considered to be a " keystone species " in the Arctic marine regions.

Lions are apex and keystone predators, although they scavenge as opportunity allows.

Frogs are a keystone group in the food web dynamics of many of the world's ecosystems.

Oaks are keystone species in a wide range of habitats from Mediterranean semi-desert to subtropical rainforest.

In such ecosystems, sea otters are a keystone predator.

Such predators are known as keystone species and may have a profound influence on the balance of organisms in a particular ecosystem.

Figs are keystone species in many rainforest ecosystems.

Cassowaries are a keystone species of rain forests because they eat fallen fruit whole and distribute seeds across the jungle floor via excrement.

We are, therefore, determined that Australia shall not go, and we shall exert all our energies towards the shaping of a plan, with the United States as its keystone, which will give to our country some confidence of being able to hold out until the tide of battle swings against the enemy.

Given that there are many historical definitions of the keystone species concept, and without a consensus on its exact definition, a list of examples best illustrates the concept of keystone species.

Since the prey numbers are low, the keystone predator numbers can be even lower and still be effective.

Although the terms ' keystone ' and ' engineer ' are used interchangeably, the latter is better understood as a subset of keystone species.

The windows on the main floor are each surrounded by smaller pilasters beneath a triangular pediment formed by keel moulding geisons, while the second level windows are each simply framed by astragal moulding broken at the top by a keystone.

Taps for cask beer are simple on-off valves that are hammered into the end of the cask ( see keystone for details ).