niche

niche

 [nich]

a small recess, depression or indentation, especially a recess in the wall of a hollow organ that tends to retain contrast media, as revealed by radiographs.

niche

(nitch, nēsh),

1. In contrast radiography, an eroded or ulcerated area, especially gastrointestinal or vascular, which can be detected when it fills with contrast medium.

2. An ecologic term for the position occupied by a species in a biotic community, particularly its relationships to various other competitor, predator, prey, and parasite species.

[Fr.]

niche

Imaging A recess which may correspond to an ulcer in the wall of a hollow organ which tends to retain contrast medium

niche

(nich, nēsh)

1. radiography An eroded or ulcerated area, especially gastrointestinal or vascular, which can be detected when it fills with contrast medium.

2. An ecologic term for the position occupied by a species in a biotic community, particularly its relationships to various other competitor, predator, prey, and parasite species.

[Fr.]

niche

the sum of the characters that determine the position of an organism in its ECOSYSTEM. This includes all the chemical, physical, spatial and temporal factors required for the survival of that species and which limit its distribution and growth. A niche is characteristic of a SPECIES, and no two species occupy the same niche in the same environment in each others’ presence. However, a different species may occupy the same niche in the absence of the normal occupant from that habitat.