Webster Dictionary(0.00 / 0 votes)Rate this definition: 1  Construct(verb) to put together the constituent parts of (something) in their proper place and order; to build; to form; to make; as, to construct an edifice. 2  Construct(verb) to devise; to invent; to set in order; to arrange; as, to construct a theory of ethics.
Species interactions within ecological webs include four main types of two-way interactions: mutualism, commensalism, competition, and predation (which includes herbivory and parasitism).Because of the many linkages among species within a food web, changes to one species can have far-reaching effects.he keystone species concept is one of the best-known ideas in community ecology. Although it is true that many species potentially interact with one another in a food web such as depicted in Figure 1, in nature there are big players and little players. The biggest players of all are referred to as keystone species.
organisms can be classified in three different ways: competition, predation, and symbiosis. Competition occurs when two organisms are using the same resource. Predation is the relationship where one organism consumes another. Symbiosis is a close interaction between two unlike species where at least one species benefits. These interactions are a crucial part of a functioning ecosystem. Symbiotic Relationships Many organisms rely on symbiotic relationships for survival. Symbiosis is a close interaction between two unlike species where at least one species benefits. The other organism will either be harmed, unaffected, or receive a benefit. When describing these relationships, scientists use +, 0 and - as