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symbiosis The term literally means "living together".

A symbiotic relationship in biology is any kind of intimate association between individuals of two or more species. It 's a very common strategy in nature and are very, very few animals that do not serve as a habitat for thousands of microorganisms.

symbionts is the term given to all those organisms that live on or in another species.

There are many symbiotic relationships. An example? The Forest namely: an individual of a species is transported by an individual of another species. The person that you carry is the symbiont or more specifically in this case the foronte

. A common example is the transport of cysts, eggs or adults of one species onto another. Coming scattered foronti may derive a benefit from transport, but it does not depend on the behavior of the host and is not affected. In other types of symbiosis, the symbionts are specifically adapted to exploit their hosts and depend totally or partially from their hosts. And here we have the commensalism resembling the Forest as the host is not affected but the symbiote though capable of surviving alone usually increases its fitness (fitness in biology, the term stands for ... ) associating with the host. They play a range of behaviors that allow them to obtain food and protection from their guests. Many diners ingest food scraps left behind by their hosts. Among the many protective cases commmensalismo several small fish and crabs are associated with sea urchins hiding among the spines when approaching predators. The
parasitism

the third type of symbiosis implies a greater adaptation between host and symbiont and a greater exploitation of the host than commensalism. In this case everything is to the detriment of the host and in favor of the parasite, which derives a benefit while their guests are adversely affected. Parasites depend on nutritionally forced from their hosts and are not able to sopravvvere without them. In general, parasites are evolving toward a state that does not harm their hosts because destroying them causing harm to themselves and the environment in which they live. Even the host evolves in the report and in most cases the host protective responses have a certain degree of control on the population of the parasite. The

mutualism involves the exploitation and mutual iterdipendenza a complex interaction between individuals of two different species. The report may be mandatory or optional, but both species will derive benefit. Typically, this type of association can riparo, risorse alimentari, protezione, e una serie di benefici che non sono disponibili all'una o all'altra specie. Vedremo nei prossimi post una serie di esempi di come queste interazioni tra specie viventi avvengono.