An isolated population of Austrolebias charrua (Rivulidae, Cyprinodontiformes) detected in a fragile ecosystem (Maldonado, Uruguay)

A small isolated population of tesselated snake, Natrix tesselata was found in the Upper Don (Lipetsk Region, Russia). It is the first record of this species in the Central Chernozem Territory of Russia, which is separated from the northern border of the main range by the distance of about 200 km. An isolated population of common frog, Rana temporaria and phenetically peculiar population of fire-bellied toad, Bombina bombina are found here too. Faunistic aspect of new herpetological records is discussed.

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Population fragmentation causes inadequate gene flow and increases extinction risk

10.1093/oso/9780198783398.003.0005 ◽

2017 ◽

Author(s):

Richard Frankham ◽

Jonathan D. Ballou ◽

Katherine Ralls ◽

Mark D. B. Eldridge ◽

Michele R. Dudash ◽

...

Keyword(s):

Gene Flow ◽

Extinction Risk ◽

Random Mating ◽

Large Population ◽

Isolated Population ◽

Population Fragmentation ◽

Single Population ◽

Total Size ◽

Limited Gene Flow

Most species now have fragmented distributions, often with adverse genetic consequences. The genetic impacts of population fragmentation depend critically upon gene flow among fragments and their effective sizes. Fragmentation with cessation of gene flow is highly harmful in the long term, leading to greater inbreeding, increased loss of genetic diversity, decreased likelihood of evolutionary adaptation and elevated extinction risk, when compared to a single population of the same total size. The consequences of fragmentation with limited gene flow typically lie between those for a large population with random mating and isolated population fragments with no gene flow.

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Canine Distemper in an Isolated Population of Fishers (Martes pennanti) from California

Journal of Wildlife Diseases ◽

10.7589/2011-12-350 ◽

2012 ◽

Vol 48 (4) ◽

pp. 1035-1041 ◽

Cited By ~ 21

Author(s):

Stefan M. Keller ◽

Mourad Gabriel ◽

Karen A. Terio ◽

Edward J. Dubovi ◽

Elizabeth VanWormer ◽

...

Keyword(s):

Isolated Population ◽

Martes Pennanti ◽

Canine Distemper

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Adaptive divergence despite low effective population size in a peripherally isolated population of the pygmy rabbit, Brachylagus idahoensis

Molecular Ecology ◽

10.1111/mec.16040 ◽

2021 ◽

Author(s):

Nathan W. Byer ◽

Matthew L. Holding ◽

Miranda M. Crowell ◽

Todd W. Pierson ◽

Thomas E. Dilts ◽

...

Keyword(s):

Population Size ◽

Effective Population Size ◽

Adaptive Divergence ◽

Isolated Population ◽

Effective Population ◽

Pygmy Rabbit ◽

Brachylagus Idahoensis

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The Kota of the Nilgiri hills: a demographic study

Journal of Biosocial Science ◽

10.1017/s0021932000010415 ◽

1976 ◽

Vol 8 (1) ◽

pp. 17-26 ◽

Cited By ~ 6

Author(s):

Aloke Kumar Ghosh

Keyword(s):

Total Population ◽

Random Mating ◽

High Rate ◽

Moderate Intensity ◽

Biological Study ◽

Isolated Population ◽

Demographic Structure ◽

Effective Population ◽

Mating Population ◽

The Village

A population–biological study of the Kota of the Nilgiri Hills was undertaken between May 1966 and January 1968. This paper discusses the demographic structure of the tribe and its genetic implications.The Kota is a small tribe of 1203 individuals distributed in only seven villages; it is an isolated population with a low rate of fertility and a high rate of infant mortality. The Kota is not a random mating population. The rate of consanguineous marriages is high and the coefficient of inbreeding is almost equal to the highest recorded value. Besides cousin marriages, marriage within the village is very much preferred. The admixture rate (0·29%) among the Kota is very low. The effective population size is only 28·87% of the total population. The coefficient of breeding isolation is 1·01, which indicates that genetic drift may produce important differentiation in this population. The data show that selection is acting with moderate intensity in this population.

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