Small effective population size in microrefugia?

2014 ◽  
Vol 53 (2) ◽  
pp. 163-165 ◽  
Author(s):  
Wei-Ning BAI ◽  
Da-Yong ZHANG
Keyword(s):  
Population Size ◽  
Effective Population Size ◽  
Effective Population ◽  
Small Effective Population Size

Temporal genetic samples indicate small effective population size of the endangered yellow-eyed penguin

2009 ◽  
Vol 11 (2) ◽  
pp. 539-546 ◽  
Author(s):  
Sanne Boessenkool ◽  
Bastiaan Star ◽  
Philip J. Seddon ◽  
Jonathan M. Waters
Keyword(s):  
Population Size ◽  
Effective Population Size ◽  
Effective Population ◽  
Small Effective Population Size

scholarly journals Population Data for the Transferrin Variants in the Australian Merino

1967 ◽  
Vol 20 (5) ◽  
pp. 959 ◽  
Author(s):  
DW Cooper ◽  
LF Bailey ◽  
O Mayo
Keyword(s):  
Population Size ◽  
Effective Population Size ◽  
Population Data ◽  
The South ◽  
Effective Population ◽  
Parent Population ◽  
Gene Frequencies ◽  
The Relationship ◽  
Small Effective Population Size ◽  
Australian Merino

Population data for the transferrin varil;mts in the South Australian and Camden Park strains of the Australian Merino are reported. In all, five variants designated A, B, C, D, and E were distinguished. The relationship between these variants and those reported in previous investigations of the Merino and other breeds has been determined. In two out of the six samples there were significant departures from Hardy-Weinberg expectations. It was observed that closed flocks with small effective population size, Camden Park and one South Australian (Roseworthy) flock had fewer than five variants, the number generally found in all strains of the Australian Merino so far examined. For the Roseworthy material it was possible to demonstrate that the parent population, Anama, had the five variants. Further, the two Roseworthy flocks derived from the Anama stock had significantly different gene frequencies from that flock.

scholarly journals Small effective population size and genetic homogeneity in the Val Borbera isolate

2012 ◽  
Vol 21 (1) ◽  
pp. 89-94 ◽  
Author(s):  
Vincenza Colonna ◽  
Giorgio Pistis ◽  
Lorenzo Bomba ◽  
Stefano Mona ◽  
Giuseppe Matullo ◽  
...  
Keyword(s):  
Population Size ◽  
Effective Population Size ◽  
Genetic Homogeneity ◽  
Effective Population ◽  
Small Effective Population Size

scholarly journals Levels and patterns of genetic diversity differ between two closely related endemicArabidopsisspecies

2016 ◽  
Author(s):  
Julie Jacquemin ◽  
Nora Hohmann ◽  
Matteo Buti ◽  
Alberto Selvaggi ◽  
Thomas Müller ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Size ◽  
Effective Population Size ◽  
Endemic Species ◽  
Isolation By Distance ◽  
Demographic History ◽  
Adaptive Potential ◽  
Effective Population ◽  
Distribution Ranges ◽  
Small Effective Population Size

AbstractTheory predicts that a small effective population size leads to slower accumulation of mutations, increased levels of genetic drift and reduction in the efficiency of natural selection. Therefore endemic species should harbor low levels of genetic diversity and exhibit a reduced ability of adaptation to environmental changes.Arabidopsis pedemontanaandArabidopsis cebennensis, two endemic species from Italy and France respectively, provide an excellent model to study the adaptive potential of species with small distribution ranges. To evaluate the genome-wide levels and patterns of genetic variation, effective population size and demographic history of both species, we genotyped 53A. pedemontanaand 28A. cebennensisindividuals across the entire species ranges with Genotyping-by-Sequencing. SNPs data confirmed a low genetic diversity forA. pedemontanaalthough its effective population size is relatively high. Only a weak population structure was observed over the small distribution range ofA. pedemontana, resulting from an isolation-by-distance pattern of gene flow. In contrary,A. cebennensisindividuals clustered in three populations according to their geographic distribution. Despite this and a larger distribution, the overall genetic diversity was even lower forA. cebennensisthan forA. pedemontana.A demographic analysis demonstrated that both endemics have undergone a strong population size decline in the past, without recovery. The more drastic decline observed inA. cebennensispartially explains the very small effective population size observed in the present population. In light of these results, we discuss the adaptive potential of these endemic species in the context of rapid climate change.

Improving Genetic Status Despite Fragmentation and Small Effective Population Size in Hill's Thistle (Cirsium hillii)

2022 ◽  
Vol 187 (1) ◽  
Author(s):  
Daniel P. Carlsen ◽  
Leah E. Sefton ◽  
Chelsea L. Butcher ◽  
Chelsi P. Abbott ◽  
Joanne M. Dannenhoffer ◽  
...  
Keyword(s):  
Population Size ◽  
Effective Population Size ◽  
Effective Population ◽  
Genetic Status ◽  
Small Effective Population Size

Small effective population size in the long-toed salamander

1999 ◽  
Vol 8 (10) ◽  
pp. 1633-1640 ◽  
Author(s):  
W. Chris Funk ◽  
David A. Tallmon ◽  
Fred W. Allendorf
Keyword(s):  
Population Size ◽  
Effective Population Size ◽  
Effective Population ◽  
Small Effective Population Size
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