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2021 ◽  
Author(s):  
Vanessa Munoz-Valencia ◽  
James Montoya-Lerma ◽  
Perttu Seppa ◽  
Fernando Diaz

Disentangling the mechanisms underlying spatial distribution of genetic variation into those due to environment or physical barriers from mere geographic distance is challenging in complex landscapes. The Andean uplift represents one of the most heterogeneous habitats where these questions remain unexplored as multiple mechanisms might interact, confounding their relative roles. We explore this broad question in the leaf-cutting ant Atta cephalotes, a species distributed across the Andes Mountains using nuclear microsatellite markers and mtCOI gene sequences. We investigate spatial genetic divergence across the Western range of Northern Andes in Colombia by testing the relative role of alternative scenarios of population divergence, including geographic distance (IBD), climatic conditions (IBE), and physical barriers due to the Andes Mountains (IBB). Our results reveal substantial genetic differentiation among A. cephalotes populations for both types of markers, but only nuclear divergence followed a hierarchical pattern with multiple models of genetic divergence imposed by the Western range. Model selection showed that IBD, IBE (temperature and precipitation), and IBB (Andes mountains) models, often proposed as individual drivers of genetic divergence, interact, and explain up to 33% of genetic divergence in A. cephalotes. IBE models remained significant after accounting for IBD, suggesting that environmental factors play a more prominent role when compared to IBB. These factors in combination with idiosyncratic dispersal patterns of ants appear to determine hierarchical patterns of gene flow. This study enriches our understanding of the forces shaping population divergence in complex habitat landscapes.


2021 ◽  
Vol 17 (S6) ◽  
Author(s):  
Hernan P. Zamponi ◽  
Leonardo Juarez‐Aguaysol ◽  
Gabriela Kukoc ◽  
Maria Eugenia Dominguez ◽  
Belén Pini ◽  
...  

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11917
Author(s):  
Violeta Cárcamo-Tejer ◽  
Irma Vila ◽  
Francisco Llanquín-Rosas ◽  
Alberto Sáez-Arteaga ◽  
Claudia Guerrero-Jiménez

From the early Miocene, the uplift of the Andes Mountains, intense volcanic activity and the occurrence of successive periods of dryness and humidity would have differentially influenced the modification of Altiplano watersheds, and consequently the evolutionary history of the taxa that live there. We analyzed Orestias populations from the Caquena and Lauca Altiplanic sub-basins of northern Chile to determine their genetic differentiation and relationship to their geographical distribution using mitochondrial (D-loop) and nuclear (microsatellite) molecular markers and to reconstruct its biogeographic history on these sub-basins. The results allowed reconstructing and reevaluating the evolutionary history of the genus in the area; genic diversity and differentiation together with different founding genetic groups suggest that Orestias have been spread homogeneously in the study area and would have experienced local disturbances that promoted isolation and diversification in restricted zones of their distribution.


2021 ◽  
Vol 34 (2) ◽  
Author(s):  
Colleen Alena O'Brien

Kamsá is a language isolate spoken in the Sibundoy Valley in the Putumayo department of southern Colombia. Its speech community lives on the eastern slopes of the Andes Mountains, between the linguistic areas of the Andes and the Amazon. This paper presents various grammatical features of Kamsá, including its phonology, nominal morphology (especially noun class and case marking), verbal morphology (especially person/number marking for core arguments and evidentiality), morphosyntactic alignment, and syntax (including discussion of causatives, comparatives, and subordinate clauses). In doing so, the paper places Kamsá within its typological and geographical context, between the Amazon and the Andes.


Zootaxa ◽  
2021 ◽  
Vol 4995 (1) ◽  
pp. 56-70
Author(s):  
OMID JOHARCHI ◽  
STEFAN FRIEDRICH

Two new species of mites in the genus Gaeolaelaps (Laelapidae) are described from specimens collected from soil-litter in the Peruvian Andes – G. acanthopedus sp. nov. and G. andensis sp. nov.. Both species are consistent with the current concept of the genus Gaeolaelaps Evans & Till. The genus Gaeolaelaps is reported for the first time from Peru.  


2021 ◽  
Vol MA2021-01 (57) ◽  
pp. 1553-1553
Author(s):  
Juan Vorobioff ◽  
Norberto Boggio ◽  
Marcelo Gutierrez ◽  
Carlos Rinaldi
Keyword(s):  

Geology ◽  
2021 ◽  
Author(s):  
Sarah W.M. George ◽  
Brian K. Horton ◽  
Cristian Vallejo ◽  
Lily J. Jackson ◽  
E. Gabriela Gutierrez

The onset of orogenic shortening in the northern Andes Mountains coincided with latest Cretaceous accretion of the Caribbean oceanic plateau. We present isotopic data (εHf in zircon and εNd) coupled with arc position to test whether accretion led to abrupt crustal thickening in the northern Andes of Ecuador and Colombia. A rapid isotopic excursion toward more evolved crustal compositions was synchronous with ca. 75–70 Ma collision in Ecuador and preceded a similar deviation in Colombia at ca. 70–55 Ma. The rapid but diachronous shift to more evolved isotopic signatures is attributed to progressive northward accretion of the oceanic plateau and associated thickening of continental crust. We emphasize the effects of accretion on the magmatic evolution of Cordilleran-type margins, initially provoking shortening and crustal thickening, and ultimately providing a substrate for subsequent arcs.


2021 ◽  
Author(s):  
Tiffany M. Doan ◽  
Sara A. Sheffer ◽  
Nicholas R. Warmington ◽  
Eliot E. Evans

2021 ◽  
Vol 9 (3) ◽  
pp. 538 ◽  
Author(s):  
Paulina Vega-Celedón ◽  
Guillermo Bravo ◽  
Alexis Velásquez ◽  
Fernanda P. Cid ◽  
Miryam Valenzuela ◽  
...  

Cold stress decreases the growth and productivity of agricultural crops. Psychrotolerant plant growth-promoting bacteria (PGPB) may protect and promote plant growth at low temperatures. The aims of this study were to isolate and characterize psychrotolerant PGPB from wild flora of Andes Mountains and Patagonia of Chile and to formulate PGPB consortia. Psychrotolerant strains were isolated from 11 wild plants (rhizosphere and phyllosphere) during winter of 2015. For the first time, bacteria associated with Calycera, Orites, and Chusquea plant genera were reported. More than 50% of the 130 isolates showed ≥33% bacterial cell survival at temperatures below zero. Seventy strains of Pseudomonas, Curtobacterium, Janthinobacterium, Stenotrophomonas, Serratia, Brevundimonas, Xanthomonas, Frondihabitans, Arthrobacter, Pseudarthrobacter, Paenarthrobacter, Brachybacterium, Clavibacter, Sporosarcina, Bacillus, Solibacillus, Flavobacterium, and Pedobacter genera were identified by 16S rRNA gene sequence analyses. Ten strains were selected based on psychrotolerance, auxin production, phosphate solubilization, presence of nifH (nitrogenase reductase) and acdS (1-aminocyclopropane-1-carboxylate (ACC) deaminase) genes, and anti-phytopathogenic activities. Two of the three bacterial consortia formulated promoted tomato plant growth under normal and cold stress conditions. The bacterial consortium composed of Pseudomonas sp. TmR5a & Curtobacterium sp. BmP22c that possesses ACC deaminase and ice recrystallization inhibition activities is a promising candidate for future cold stress studies.


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