Results for “pH”

species richness

The number of species present in a given sample, habitat, or otherwise specified geographical region.

speciose

Containing a high number of species. Normally applied to a taxonomic group or specified geographical area.

Used in 177 profiles

sympatric

Occurring within the same, specified geographical area, but without interbreeding and not necessarily competing for the same resources or dwelling in the same habitat. Opposite of allopatric.

Used in 195 profiles

syntopic

Occupying the same habitat within a specified geographical area, and sometimes competing for resources as a result.

Used in 18 profiles

vestigial

Character or morphological feature having attained a simplified structure and reduced size, function and importance during the evolution of a taxon.

Used in 4 profiles

vicariance

Separation or division of a population by a geographic barrier, such as a mountain or body of water, resulting in evolution into new varieties or species.

vicariant

Used in reference to any of several closely related species, variants, etc., each of which exists in a distinct geographical area but are assumed to have originated from a single population that became dispersed by geological events; of or relating to such an event.

Wallace's line

Hypothetical line, proposed by British naturalist Alfred Russel Wallace that marks the transitional boundary between the Oriental and Australian zoogeographical regions. It passes between the islands of Borneo and Sulawesi to its northern limit, Bali and Lombok to the south. To the west of the line organisms descended from Asiatic ancestors predominate, while to the east there exist species of both Asian and Australian origin.

Used in 1 profile

Weberian apparatus

Anatomical structure connecting the swim bladder to the inner ear found in members of the fish superorder Ostariophysi. Conveys sound and changes in pressure, and comprises four or five modified vertebrae.

Used in 5 profiles

Weberian ossicle

Any of the modified vertebrae comprising the Weberian apparatus in Ostariophysian fishes, individually named the claustrum, scaphium, intercalarium and tripus.