Chromosomal Races in the Australian Grasshopper Moraba viatica in a Zone of Geographic Overlap

Evolution ◽  
1964 ◽  
Vol 18 (3) ◽  
pp. 417 ◽  
Author(s):  
M. J. D. White ◽  
H. L. Carson ◽  
J. Cheney
Keyword(s):  
Chromosomal Races ◽  
Geographic Overlap

scholarly journals CHROMOSOMAL RACES IN THE AUSTRALIAN GRASSHOPPER MORABA VIATICA IN A ZONE OF GEOGRAPHIC OVERLAP

Evolution ◽  
1964 ◽  
Vol 18 (3) ◽  
pp. 417-429 ◽  
Author(s):  
M. J. D. White ◽  
H. L. Carson ◽  
J. Cheney
Keyword(s):  
Chromosomal Races ◽  
Geographic Overlap

scholarly journals The Biogeography of Adaptive Radiations and the Geographic Overlap of Sister Species

2015 ◽  
Vol 186 (5) ◽  
pp. 565-581 ◽  
Author(s):  
Mikael Pontarp ◽  
Jörgen Ripa ◽  
Per Lundberg
Keyword(s):  
Sister Species ◽  
Adaptive Radiations ◽  
Geographic Overlap

Gene Flow Between Chromosomal Races and Species

2019 ◽  
pp. 313-335
Author(s):  
Glenn Yannic ◽  
Patrick Basset ◽  
Agnès Horn ◽  
Jacques Hausser
Keyword(s):  
Gene Flow ◽  
Chromosomal Races

Diversity, complementary distributions and taxonomy of Rhagada land snails (Gastropoda : Camaenidae) on the Burrup Peninsula, Western Australia

2016 ◽  
Vol 30 (4) ◽  
pp. 323 ◽  
Author(s):  
Michael S. Johnson ◽  
Sean Stankowski ◽  
Peter G. Kendrick ◽  
Zoë R. Hamilton ◽  
Roy J. Teale
Keyword(s):  
Western Australia ◽  
Genetic Similarity ◽  
Phylogenetic Diversity ◽  
Sister Group ◽  
Land Snails ◽  
Island Species ◽  
Local Sampling ◽  
Geographic Overlap

Phylogenetic diversity of Rhagada land snails is high on the Burrup Peninsula, Western Australia, with four distinct clades, representing three of the four major clades of the Pilbara region. Detailed sampling indicated little geographic overlap of the four clades, conforming to the general rarity of congeneric sympatry in Australian camaenids. The diversity on the Burrup Peninsula includes three previously unclassified morphotypes. One of these lies within the broad endemic clade of the adjacent Dampier Archipelago, and is provisionally assigned to the island species R. perprima, based on phylogenetic evidence. The two other undescribed morphotypes constitute an endemic clade that is the sister group of the broader Dampier Archipelago clade. All COI p-distances within clades are less than 6%, whereas nearly all distances between clades exceed 10%, the gap corresponding to differences among species of Rhagada generally. One morphotype in the Burrup Peninsula endemic clade has a low spire and a distinctive keel, and is restricted to a single rockpile. Detailed local sampling revealed gradation between this form and the more widely distributed globose morphotype. On the basis of genetic similarity and morphological continuity, we describe the morphologically variable endemic Burrup Peninsula clade as Rhagada ngurrana, sp. nov., which has a distribution spanning only 9 km.

scholarly journals Genic differentiation and origin of Robertsonian populations of the house mouse (Mus musculus domesticus Rutty)

1989 ◽  
Vol 53 (1) ◽  
pp. 29-44 ◽  
Author(s):  
Janice Britton-Davidian ◽  
Joseph H. Nadeau ◽  
Henri Croset ◽  
Louis Thaler
Keyword(s):  
Gene Flow ◽  
House Mouse ◽  
Mus Musculus ◽  
Western Europe ◽  
Chromosomal Rearrangements ◽  
Nuclear Gene ◽  
Electrophoretic Analysis ◽  
Mus Musculus Domesticus ◽  
Effective Population ◽  
Chromosomal Races

SummaryThis paper examines the relation between chromosomal and nuclear-gene divergence in 28 wild populations of the house mouse semi-species, Mus musculus domesticus, in Western Europe and North Africa. Besides describing the karyotypes of 15 of these populations and comparing them to those of 13 populations for which such information was already known, it reports the results of an electrophoretic survey of proteins encoded by 34 nuclear loci in all 28 populations. Karyotypic variation in this taxon involves only centric (or Robertsonian) fusions which often differ in arm combination and number between chromosomal races. The electrophoretic analysis showed that the amount of genic variation within Robertsonian (Rb) populations was similar to that for all-acrocentric populations, i.e. bearing the standard karyotype. Moreover, divergence between the two types of populations was extremely low. These results imply that centric fusions in mice have not modified either the level or the nature of genic variability. The genetic similarity between Rb and all-acrocentric populations is not attributed to the persistence of gene flow, since multiple fusions cause marked reproductive isolation. Rather, we attribute this extreme similarity to the very recent origin of chromosomal races in Europe. Furthermore, genic diversity measures suggest that geographically separated Rb populations have in situ and independent origins. Thus, Rb translocations are probably not unique events, but originated repeatedly. Two models are presented to explain how the rapid fixation of a series of chromosomal rearrangements can occur in a population without lowering variability in the nuclear genes. The first model assumes that chromosomal mutation rates are between 10−3 and 10−4 and that populations underwent a series of transient bottlenecks in which the effective population size did not fall below 35. In the second model, genic variability is restored following severe bottlenecks, through gene flow and recombination.

scholarly journals Spatial and Temporal Dynamics of Contact Zones Between Chromosomal Races of House Mice, Mus musculus domesticus, on Madeira Island

Genes ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 748 ◽  
Author(s):  
Joaquim T. Tapisso ◽  
Sofia I. Gabriel ◽  
Ana Mota Cerveira ◽  
Janice Britton-Davidian ◽  
Guila Ganem ◽  
...  
Keyword(s):  
Contact Zone ◽  
Temporal Dynamics ◽  
Significant Shift ◽  
Mus Musculus Domesticus ◽  
Landscape Resistance ◽  
Sampling Area ◽  
Contact Zones ◽  
Madeira Island ◽  
The North ◽  
Chromosomal Races

Analysis of contact zones between parapatric chromosomal races can help our understanding of chromosomal divergence and its influence on the speciation process. Monitoring the position and any movement of contact zones can allow particular insights. This study investigates the present (2012–2014) and past (1998–2002) distribution of two parapatric house mouse chromosomal races—PEDC (Estreito da Calheta) and PADC (Achadas da Cruz)—on Madeira Island, aiming to identify changes in the location and width of their contact. We also extended the 1998–2002 sampling area into the range of another chromosomal race—PLDB (Lugar de Baixo). Clinal analysis indicates no major geographic alterations in the distribution and chromosomal characteristics of the PEDC and PADC races but exhibited a significant shift in position of the Rb (7.15) fusion, resulting in the narrowing of the contact zone over a 10+ year period. We discuss how this long-lasting contact zone highlights the role of landscape on mouse movements, in turn influencing the chromosomal characteristics of populations. The expansion of the sampling area revealed new chromosomal features in the north and a new contact zone in the southern range involving the PEDC and PLDB races. We discuss how different interacting mechanisms (landscape resistance, behaviour, chromosomal incompatibilities, meiotic drive) may help to explain the pattern of chromosomal variation at these contacts between chromosomal races.

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