Stable inversion clines in a grasshopper species group despite complex geographic history

2021 ◽  
Author(s):  
Noelia V. Guzmán ◽  
Petri Kemppainen ◽  
Daniela Monti ◽  
Elio R. D. Castillo ◽  
Marcela S. Rodriguero ◽  
...  
Keyword(s):  
Species Group ◽  
Grasshopper Species ◽  
Stable Inversion

scholarly journals The genomic architecture of inversion clines in a grasshopper species group with a complex biogeographic history

2021 ◽  
Author(s):  
Noelia Guzman ◽  
Petri Kemppainen ◽  
Daniela Monti ◽  
Elio Castillo ◽  
Marcela Rodriguero ◽  
...  
Keyword(s):  
Environmental Variables ◽  
Environmental Gradients ◽  
Species Group ◽  
Snp Markers ◽  
Clinal Variation ◽  
Recombination Suppression ◽  
Grasshopper Species ◽  
Genetic Lineages ◽  
Biogeographic History ◽  
Genomic Architecture

Chromosomal inversions play a role in the adaptation and diversification of different systems, mainly due to supergenes resulting from recombination suppression. Supergenes are “clusters” of genes in linkage disequilibrium (LD) whose frequencies may be associated with environmental variables. The grasshopper “species complex” Trimerotropis pallidipennis is considered to have several genetic lineages distributed from North to South America in arid and semi-arid high-altitude environments. The southernmost lineage, Trimerotropis sp., bears 4 to 7 putative inversion polymorphisms with clinal variation, possibly allowing adaptation to temperate environments. We analyzed chromosomal, mitochondrial and genome-wide SNP markers in 19 Trimerotropis sp. populations mainly distributed along two altitudinal gradients (MS and Ju). We show that populations across Argentina are formed by two main chromosomally and genetically differentiated lineages: one distributed in the southernmost border of the “Andes Centrales”, adding evidence for a differentiation hotspot in this area; and the other widely distributed in Argentina. Within the latter, genomic architecture analysis revealed four clusters of loci in high LD that correspond to inversions, of which at least one is associated to a chromosomal rearrangement, confirming its status as “true inversion”. We demonstrated the stability of chromosome polymorphisms for more than 20 generations and the occurrence of non-neutral markers associated with inversions and environmental variables. Inversion clines could be the consequence of coupling between extrinsic postzygotic barriers, leading to a hybrid zone, and spatially varying selection along environmental gradients. These results provide a framework for future investigations about candidate genes implicated in the rapid adaptation to new environments.

Genetic divergence within the Drosophila mayaguana subcluster, a closely related triad of Caribbean species in the repleta species group

Hereditas ◽  
2002 ◽  
Vol 136 (3) ◽  
pp. 240-246 ◽  
Author(s):  
P. M. O'GRADY ◽  
C. M. DURANDO ◽  
W. B. HEED ◽  
M. WASSERMAN ◽  
W. ETGES ◽  
...  
Keyword(s):  
Genetic Divergence ◽  
Species Group

New species of bristletails of the genus Lepismachilis (Archaeognatha: Machilidae) from Serbia and Montenegro

2018 ◽  
Vol 58 (2) ◽  
pp. 577-587
Author(s):  
Vladimir Kaplin
Keyword(s):  
New Species ◽  
Balkan Peninsula ◽  
Species Group ◽  
Compound Eyes ◽  
Serbia And Montenegro ◽  
Sensory Field ◽  
Fore Femur ◽  
Three New Species

Abstract The fauna of bristletails of the genus Lepismachilis Verhoeff, 1910 in Montenegro and Serbia includes only one species L. (Berlesilis) targionii (Grassi, 1887) with 2 + 2 eversible vesicles on abdominal urocoxites II–VI. Three new species of this genus are described: L. (Lepismachilis) prijepolja sp. nov., L. (Lepismachilis) limensa sp. nov. from Serbia, and L. (Lepismachilis) alexandrae sp. nov. from Montenegro. All described new species belong to the species group of the subgenus Lepismachilis s. str. with 2 + 2 eversible vesicles on abdominal urocoxites II–V. Lepismachilis prijepolja sp. nov. differs from L. y-signata Kratochvíl, 1945 and L. notata Stach, 1919 by the color, drawings and ratios of the compound eyes; ratios of sensory field on fore femur of male, number of divisions of ovipositor. Lepismachilis limensa sp. nov. differs from L. hauseri Bitsch, 1974 and L. abchasica Kaplin, 2017 by ratios of paired ocelli, sensory field on fore femur of male; ratios and chaetotaxy of maxillary and labial palps. Lepismachilis alexandrae sp. nov. differs from L. abchasica by the drawings of the compound eyes; ratios of paired ocelli, sensory field on fore femur of male; number of divisions of the parameres and gonapophyses. A list of the Machilidae occurring in Balkan Peninsula is also provided.

Swamp plant communities with Salix reptans Rupr. and S. lanata L. in the west of tundra zone of Taymyr Peninsula

2003 ◽  
pp. 28-40 ◽  
Author(s):  
L. L. Zanokha
Keyword(s):  
Plant Communities ◽  
Species Group ◽  
Intermediate Position ◽  
Tundra Zone ◽  
The West ◽  
Diagnostic Species ◽  
New Associations ◽  
Mire Vegetation ◽  
Humidity Gradient ◽  
Ecological Regime

The 2 new associations, Carici stantis—Salicetum reptantis and Salico-Polemonietum acutiflori, are described within the all. Caricionstantis of the class Scheuchzerio-Caricetea fuscae R. Tx. 1937 for the northern belt of the typical tundra subzone of Taymyr. The diagnostic species group of the first syntaxon includes plants typical of sites with excessive watering. The ass. Carici stantis—Salicetum reptantis is restricted to bottoms or lower parts of the watershed and moun­tain terrace slopes. The ecological regime of these sites is subject to slight variations reflected in presence/ absence of certain species. Due to floristic differences, the association is subdivided into several subassociations which form a topographic-ecological series along the humidity gradient: epilobietosum palustris→ptilidietosum ciliaris→typicum→petasitetosum frigidi. The ass. Carici stantis—Salicetum reptantis is referred to the all. Caricionstantis which also includes the associations Meesiotriquetris—Caricetumstantis and Pooarcticae—Dupontietumfisheri (also described from the Ragozinka R. basin); the latter occur in the wet depres­sions between sloping hills and the flowing valleys, respectively. If compared to these two, the ass. Carici stantis—Salicetum reptantis is shown to hold an intermediate position between them. The ass. Salico-Polemonietum acutiflori with the 2 variants, Salix lanata and S. reptans, represents various variants of mire vegetation which have under­gone zoogenic transformation (by lemmings). The stands size 1—1.5 m2 in space. The diagnostic species group comprises plants common of the wet mossy stream banks. The association is referred to the all. Caricion stantis, although many diagnostic species of the alliance are not present in its composition. When the new data are available, the association is probable to be separated into an independent alliance.

Review of species of the genus Cercyon of Russia and adjacent regions. VI. Subgenus Cercyon, the C.shinanensis group (Coleoptera: Hydrophilidae)

2019 ◽  
Vol 28 (2) ◽  
pp. 258-266 ◽  
Author(s):  
S.K. Ryndevich ◽  
H. Hoshina ◽  
A.A. Prokin
Keyword(s):  
Russian Far East ◽  
Far East ◽  
Species Group ◽  
Palaearctic Species ◽  
Diagnostic Features ◽  
Kunashir Island ◽  
Species Groups ◽  
The Russian Far East

The Cercyon shinanensis species group with two included species is erected within the nominotypical subgenus of Cercyon Leach, 1817. This group is compared with other Palaearctic species groups of Cercyon s. str. The little-known C. shinanensis Nakane, 1965 from Japan (Honshu) is redescribed and its diagnostic features are given. Cercyon sundukovi sp. nov. is described from the Russian Far East (Kunashir Island).

Emendation of a species-group name in the genus Oiketicoides (Lepidoptera: Psychidae)

2010 ◽  
Vol 19 (1) ◽  
pp. 127-128
Author(s):  
A.S. Ukrainsky ◽  
Yu.A. Lovtsova
Keyword(s):  
Species Group

The species-group name sysoletinae is an emended name for sysoletinovae (in combination Oiketicoides simulans sysoletinovae Lastuchin, 2008).

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