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 ?
The back-wingtip score was doubled because plumage melanism is considered the best way to visually distinguish hybrids from pure birds (Bell 1996).
feronia butterflies experimentally with regard to their choice of resting sites, to investigate how that relates to their biology and behavior, and perhaps to be able to provide a new example of the industrial melanism concept.
So I set up our problem: "Industrial melanism is a fascinating example--the same effect was measured in England and the northeastern United States in the same species as pollution increased, and then the trend reversed on both sides of the Atlantic following clean-air legislation.
Melanism in the spider Pityohyphantes phrygianus (C.
coeruleus by higher number of scales around mid-body (variable selected by discriminant analysis), lower ventral melanism and shorter forelimbs (concordant with the original description).
Key words: Turtle communities, trap bias, melanism, Trachemys scripta, Chrysemys picta, Chelydra serpentina, Sternotherus odoratus
In 1906 before the zoological section of the British Association in York he read a paper on melanism in Yorkshire lepidoptera (how the smoky, polluted atmosphere seemed to encourage moth and butterfly variations with a black tint) which the general committee ordered to be printed in full.
Kettlewell's results, published in 1959, seemed to prove that industrial melanism was a fact.
The study suggests that melanism may not confer a strong disadvantage with respect to visually-oriented predators.
The black colour, called melanism, is caused by a recessive gene (Page 10, May 31).