melanism


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melanosis

 [mel″ah-no´sis]
1. disordered melanin production, with darkening of the skin; called also melanism.
2. a disorder of pigment metabolism.
melanosis co´li brown-black discoloration of the mucosa of the colon.
melanosis i´ridis (melanosis of the iris) abnormal pigmentation of the iris by infiltration of melanoblasts.

mel·a·nism

(mel'ă-nizm),
Unusually marked, diffuse, melanin pigmentation of body hair and skin (usually not affecting the iris).
See also: melanosis.

melanism

/mel·a·nism/ (mel´ah-nizm) melanosis.

melanism

(mĕl′ə-nĭz′əm)
n.
1. See melanosis.
2. Dark coloration of the skin, hair, fur, or feathers because of a high concentration of melanin.

mel′a·nis′tic adj.

melanism

[mel′əniz′əm]
Etymology: Gk, melas, black
an abnormal deposit of dark brown to black melanin pigment in the skin, hair, and other tissues. Also called melanosis.

mel·a·nism

(mel'ă-nizm)
Unusually marked, diffuse melanin pigmentation of body hair and skin (usually not affecting the iris).
See also: melanosis

melanism

a condition in which excessive production of MELANIN produces unusual dark colour or blackness in scales, skin or plumage. see INDUSTRIAL MELANISM.

melanism

excessive deposition of melanin in the skin.
References in periodicals archive ?
Table 2 illustrates how this model measures selection for and against the melanism allele in both periods (note that in the latter, k is negative).
Applying the exponential model to changes in the frequency of the melanism allele in the peppered moth over a period of increase (1846-1896) and one of decrease (1959-1995).
The development and significance of melanism in the slider turtle.
Melanism in the Red-eared turtle (Trachemys scripta elegans).
Effects of body size and melanism on the thermal biology of garter snakes (Thamnophis sirtalis).
Melanism in the common garter snake: A Lake Erie phenomenon.
Gene flow and melanism in Lake Erie garter snake populations.
Ontogenetic melanism is characterized by an irreversible, progressive increase in pigmentation and is well documented in red-eared slider turtles (Trachemys scripta) and several other species of emydid turtles (Barbour and Carr, 1940; Lovich et al.
The population at Lake Carl Blackwell had highest incidence of melanism in size classes D and E.
scripta, it becomes evident that attainment of melanism is not a geographic factor or a factor of size of male.
The development of melanism in an Oklahoma population of Chrysemys scripta elegans (Reptilia: Testudinidae).