Cosmopolitan species

In biogeography, cosmopolitan distribution is the term for the range of a taxon that extends across all or most of the world in appropriate habitats. Such a taxon, usually a species, is said to exhibit cosmopolitanism or cosmopolitism. The extreme opposite of a cosmopolitan species is an endemic one, being found only in a single geographical location.

Qualification

The caveat “in appropriate habitat” is used to qualify the term "cosmopolitan distribution", excluding in most instances polar regions, extreme altitudes, oceans, deserts, or small, isolated islands. For example, the housefly is highly cosmopolitan, yet is neither oceanic nor polar in its distribution.

Related terms and concepts

The term pandemism also is in use, but not all authors are consistent in the sense in which they use the term; some speak of pandemism mainly in referring to diseases and pandemics, and some as a term intermediate between endemism and cosmopolitanism, in effect regarding pandemism as subcosmopolitanism. This means near cosmopolitanism, but with major gaps in the distribution, say, complete absence from Australia. Terminology varies, and there is some debate whether the true opposite of endemism is pandemism or cosmopolitanism.

Oceanic and terrestrial

Another concept in biogeography is that of oceanic cosmopolitanism and endemism. Although there is a temptation to regard the World Ocean as a medium without biological boundaries, this is far from reality; many physical and biological barriers interfere with either the spread or continued residence of many species. For example, temperature gradients prevent free migration of tropical species between the Atlantic and Indian-plus-Pacific oceans, even though there is open passage past continental masses such as the Americas and Africa/Eurasia. Again, as far as many species are concerned, the Southern Ocean and the Northern marine regions are completely isolated from each other by the intolerable temperatures of the tropical regions. In the light of such considerations, it is no surprise to find that endemism and cosmopolitanism are quite as marked in the oceans as on land.

Ecological delimitation

Another aspect of cosmopolitanism is that of ecological limitations. A species that is apparently cosmopolitan because it occurs in all oceans might in fact occupy only littoral zones, or only particular ranges of depths, or only estuaries, for example. Analogously, terrestrial species might be present only in forests, or mountainous regions, or sandy arid regions or the like. Such distributions might be patchy, or extended, but narrow. Factors of such a nature are taken widely for granted, so they seldom are mentioned explicitly in mentioning cosmopolitan distributions.

Regional and temporal variation in populations

Cosmopolitanism of a particular species or variety should not be confused with cosmopolitanism of higher taxa. For example, the family Myrmeleontidae is cosmopolitan in the sense that every continent except Antarctica is home to some indigenous species within the Myrmeleontidae, but nonetheless no one species, nor even genus, of the Myrmeleontidae is cosmopolitan. Conversely, partly as a result of human introduction of unnatural apiculture to the New World, '' Apis mellifera'' probably is the only cosmopolitan member of its family; the rest of the family Apidae have modest distributions.

Even where a cosmopolitan population is recognised as a single species, such as indeed ''Apis mellifera'', there generally will be variation between regional sub-populations. Such variation commonly is at the level of subspecies, varieties or morphs, whereas some variation is too slight or inconsistent for formal recognition.

For an example of subspecific variation, consider the so-called " African killer bee", which is the subspecies '' Apis mellifera scutellata'', and the Cape bee, which is the subspecies '' Apis mellifera capensis''; both of them are in the same cosmopolitan species ''Apis mellifera'', but their ranges barely overlap.

Other cosmopolitan species, such as the osprey and house sparrow, present similar examples, but in yet other species there are less familiar complications: some migratory birds such as the Arctic tern occur from the Arctic to the Southern Ocean, but at any one season of the year they are likely to be largely in passage or concentrated at only one end of the range. Also, some such species breed only at one end of the range. Seen purely as an aspect of cosmopolitanism, such distributions could be seen as temporal, seasonal variations.

Other complications of cosmopolitanism on a planet too large for local populations to interbreed routinely with each other include genetic effects such as ring species, such as in the ''Larus'' gulls, and the formation of clines such as in ''Drosophila''.

Ancient and modern

Cosmopolitan distributions can be observed both in extinct and extant species. For example, '' Lystrosaurus'' was cosmopolitan in the Early Triassic after the Permian-Triassic extinction event.

In the modern world, the killer whale, the blue whale, and the great white shark all have cosmopolitan distribution, extending over most of the Earth's oceans. The wasp '' Copidosoma floridanum'' is another example, as it is found around the world. Other examples include humans, cats, dogs, the western honey bee, the foliose lichen

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