Everything about Generalist And Specialist Species totally explained
A
generalist species is able to thrive in a wide variety of environmental conditions and can make use of a variety of different
resources (for example, a
heterotroph with a varied
diet).
Specialist species can only thrive in a narrow range of environmental conditions and/or have a limited diet. Organisms don't fit neatly into either group, however. Some species are highly specialized, others less so, while some can tolerate many different environments. In other words, there's a
continuum from highly specialized to broadly generalist species.
Omnivores, which eat both
plants and
animals, are usually generalists.
Herbivores are often specialists, but those that eat a variety of plants may be considered generalists. A well-known example of a specialist animal is the
koala which subsists almost entirely on
eucalyptus leaves. The
raccoon is a generalist because it has a natural range that includes most of North and Central America, and it's omnivorous, eating
berries,
insects,
eggs and small
animals.
The distinction between generalists and specialists isn't limited to animals. For example, some plants require a narrow range of temperatures,
soil conditions and
precipitation to survive while others can tolerate a broader range of conditions. A
cactus could be considered a specialist species. It will die during winters at high
latitudes or if it receives a lot of water.
When environmental conditions change, generalists are better able to adapt, while specialists tend to fall victim to
extinction much more easily. For example, if a species of fish were to go extinct, any specialist
parasites would
also face extinction. On the other hand, a species with a highly specialized
ecological niche is more effective at
competing with other organisms. For example, a fish and its
parasites are in an
evolutionary arms race, a form of
co-evolution, in which the fish constantly develops defenses against the parasite, while the parasite in turn evolves adaptations to cope with the specific defenses of its host. This which tends to drive the
speciation of more specialized species provided conditions remain relatively stable. This involves
niche partitioning as new species are formed, and higher
biodiversity.
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