Relict

(redirected from Relictual)
Also found in: Dictionary, Thesaurus, Medical, Legal.

relict

1. Ecology
a. a group of animals or plants that exists as a remnant of a formerly widely distributed group in an environment different from that in which it originated
b. (as modifier): a relict fauna
2. Geology
a. a mountain, lake, glacier, etc., that is a remnant of a pre-existing formation after a destructive process has occurred
b. a mineral that remains unaltered after metamorphism of the rock in which it occurs

Relict

(rel -ikt) A Soviet space mission launched in 1983 that made the first measurement of dipole anisotropy in the cosmic microwave background radiation.

Relict

 

an animal or plant species that exists in a given country or region as a remnant of the flora and fauna of past geological ages and that in some way is anomalous with regard to present-day conditions of existence. Relicts are identified by their ties to the plant and animal world of past ages or to definite types of vegetation. Thus, species that have been preserved without visible changes at least since the Pliocene are called Tertiary or, more correctly, Neogenic relicts.

In Colchis there are a number of remnant tree species (wing nut, zelkova, chestnut) and evergreen shrubs. The ironwood is a relict in the Talysh Mountains, and the muskrat is a relict in the Volga and Ural basins. Forest relicts in the arctic are species that advanced far to the north during the warm interglacial age and stayed there surrounded by tundra (twinflower, whortleberry, certain wintergreens). Glacial relicts are plants and animals that have survived from the ice age on a given territory.

Plant and animal species that have been preserved only in certain sectors of formerly large ranges and in this sense resemble relicts are called pseudorelicts.

A. I. TOLMACHEV

relict

[′rel·ikt]
(biology)
A persistent, isolated remnant of a once-abundant species.
(geology)
Referring to a topographic feature that remains after other parts of the feature have been removed or have disappeared.
Pertaining to a mineral, structure, or feature of a rock which represents features of an earlier rock and which persists in spite of processes tending to destroy it, such as metamorphism.
References in periodicals archive ?
Although our records document the likely western periphery of the range of the species, we predict relictual disjunct populations may be found on isolated eskers and drumlins in the more southerly parts of the Rainy lobe.
With the recent literature records and additional ones reported here, we highlight that mesic areas in semiarid vegetation such as Cerrado and Caatinga, might support peripheric and relictual populations or assist in dispersion.
Se utiliza el sistema de clasificacion de Hobbs (1993), para determinar el grado de fragmentacion del habitat: a) intacto, cuando el habitat natural representa mas del 90% del paisaje; b) variegado, cuando el habitat natural cubre entre el 60 y el 90% del paisaje; c) fragmentado, cuando el habitat natural remanente esta entre el 60 y 10%; y d) relictual, donde el habitat natural remanente ha quedado reducido a tan solo un 10% del area original en un paisaje determinado.
Its small size, lack of anadromy or large scale migration, short life span, and high degree of genetic structuring (Blackett 1962; Aspinwall 1965; Campbell and others 2014; Campbell and Lopez 2014) combined with its relictual distribution (Campbell 2011) suggest a poor dispersal ability.
dehiscens Jensen-Flaarup (recorded only from Mendoza) might be a relictual distribution along the upper reaches of Desaguadero, now dry.
Because this is uncertain, neither natural dispersal nor a relictual pattern of range-contraction can be eliminated as possible explanations for the pattern of distribution at these localities.
Considering that in the Province of Cordoba forested lands were reduced because of the advance of agricultural frontier (CABIDO & ZAK, 1999) and lichen communities are contained in relictual forest, threatened by the habitat fragmentation and application of agrochemicals further studies are crucial.
En esta zona se encuentran especies vegetales de paramo muy comunes, siendo los generos mas frecuentes: Hypericum, Arcytophillum, Espeletia, Espeletiopsis, Weinmannia, Calamagrostis, Diplostephium, Polylepis, Berberis, Lycopodium, Junco, Leptodontium y Elaphoglossum, con presencia relictual de Prunusy Libanothamnus (VILLALOBOS, 2013).
Setchellanthaceae (Capparales), a new family for a relictual, glucosinolate producing endemic of the Mexican deserts.
Caracterizacao da vegetacao relictual de savana estepica com cactaceas no Parque Estadual Lago Azul, Campo Mourao, Parana.
Vegetacion: Habitat con seis estratos, donde domina la vegetacion de mediano y gran porte con alturas entre 20 hasta los 25m, la vegetacion relictual al borde del curso de agua es dominada por A.
La condiciones de la vegetacion del sector denominado "Camino a Cinto" puede considerarse un fragmento relictual del cinturon arido del Caribe; de los tres sitios es el que tiene mayor riqueza de familias y de especies de arboles y el mayor promedio de area basal.