Genetic Variability, Divergence and Speciation in Trees of Periodically Flooded Forests of the Amazon: A Case Study of Himatanthus sucuuba (Spruce) Woodson

2010 ◽  
pp. 301-312 ◽  
Author(s):  
Cristiane S. Ferreira ◽  
Antonio V. O. Figueira ◽  
Rogério Gribel ◽  
Florian Wittmann ◽  
Maria T. F. Piedade
Keyword(s):  
Genetic Variability ◽  
Flooded Forests

scholarly journals Soils in seasonally flooded forests as methane sources: A case study of West Siberian South taiga

2018 ◽  
Vol 138 ◽  
pp. 012012
Author(s):  
S Yu Mochenov ◽  
A I Churkina ◽  
S F Sabrekov ◽  
M V Glagolev ◽  
D V Il’yasov ◽  
...  
Keyword(s):  
Flooded Forests ◽  
Seasonally Flooded

Optimization of the sampling strategy for establishing a gene bank: storing PrP alleles following a scrapie eradication plan as a case study

2006 ◽  
Vol 82 (6) ◽  
pp. 813-821 ◽  
Author(s):  
J. Fernández ◽  
T. Roughsedge ◽  
J. A. Woolliams ◽  
B. Villanueva
Keyword(s):  
Genetic Diversity ◽  
Genetic Variability ◽  
Sampling Strategy ◽  
Gene Bank ◽  
Eradication Programme ◽  
Gene Banks ◽  
Factors Influencing ◽  
Target Values ◽  
Almost All

AbstractGene banks are usually used for storing general genetic variability of endangered living populations but can be also used for storing alleles of a particular locus that are being eradicated through artificial selection programmes. In such scenarios gene banks would allow future re-introduction of one or more of the alleles being eradicated (and the associated diversity) into living populations. Frequencies within the bank for the locus of interest should have pre-determined target values. In this study, an algorithm is derived to obtain the optimal contributions of all candidate donors to achieve the target frequencies of the removed alleles in the bank while maintaining at the same time genetic variability in other loci unlinked to those targeted in the eradication programme. The efficiency of the algorithm is tested using the case of gene banks storing prion protein alleles currently disfavoured in scrapie eradication programmes (i.e., the AHQ, ARH, ARQ and VRQ alleles). Results showed that the algorithm was able to find the combinations of candidate contributions fulfilling different objectives regarding target frequencies and restrictions on coancestry. The most important factors influencing the optimal contributions were the allelic frequencies and the levels of diversity (coancestry) of the living population. Heterozygotes were favoured over homozygous individuals as, for a given number of animals contributing to the bank, the use of heterozygotes leads to lower levels of coancestry. Notwithstanding, almost all donors were sampled when restrictions on the global genetic diversity to be stored were severe.

scholarly journals How much of the invader's genetic variability can slip between our fingers? A case study of secondary dispersal of Poa annua on King George Island (Antarctica)

2017 ◽  
Vol 8 (1) ◽  
pp. 592-600 ◽  
Author(s):  
Maciej Wódkiewicz ◽  
Katarzyna J. Chwedorzewska ◽  
Piotr T. Bednarek ◽  
Anna Znój ◽  
Piotr Androsiuk ◽  
...  
Keyword(s):  
Genetic Variability ◽  
Poa Annua ◽  
King George Island ◽  
Secondary Dispersal

The Genetic Variability (RAPD) and Genotoxicity In Vivo (Alkaline and Fpg-Modified Comet Assay) in Chub (Squalius cephalus): The Sava River Case Study

2018 ◽  
Vol 12 (5) ◽  
pp. 703-712
Author(s):  
Stoimir Kolarević ◽  
Karolina Sunjog ◽  
Margareta Kračun-Kolarević ◽  
Jovana Kostić-Vuković ◽  
Jovana Jovanović ◽  
...  
Keyword(s):  
Genetic Variability ◽  
Comet Assay ◽  
Sava River ◽  
Squalius Cephalus ◽  
The Sava River

scholarly journals On the origin and diversification of Venezuelan freshwater fishes: the genus Gephyrocharax (Ostariophysi: Characidae) a case study

2013 ◽  
Vol 11 (3) ◽  
pp. 487-496 ◽  
Author(s):  
Ana Bonilla-Rivero ◽  
Héctor López-Rojas
Keyword(s):  
Genetic Variability ◽  
Freshwater Fish ◽  
Fish Fauna ◽  
Freshwater Fishes ◽  
Geographic Range ◽  
Phylogeographic Analysis ◽  
Enzyme Systems ◽  
External Group ◽  
Freshwater Fish Fauna

We conducted a phylogeographic analysis of the genus Gephyrocharaxin Venezuela to evaluate geomorphologic evidence for the formation of the country's main watersheds and to establish a biogeographical hypothesis of possible diversification mechanisms of the Neotropical freshwater fish fauna. We assayed eight enzyme systems and general proteins to estimate genetic variability (H, P), intraspecific structuring in several Gephyrocharax valencia and G. venezuelae populations (FIS, FIT, and FST), and a phylogenetic approach for the three species of Gephyrocharax in Venezuela, using Corynopoma riisei as the external group. Fourteen presumptive lociindicate that populations of the three species of Gephyrocharaxanalyzed show a clear genetic inter-specific differentiation, determined by four loci with fixed alleles (GPI-B*,IDH*, ME-1*, and ME-2*). The resulting cladogram shows two major clades: a monophyletic group consisting of Gephyrocharax n. sp. and G. venezuelae(restricted to the northwest of the country) and a group formed exclusively by G. valencia (distributed along the largest geographic range). Speciation of the Venezuelan lineages of the genus Gephyrocharaxcould be explained by the origin and course movements of the present Orinoco River together with geomorphologic processes that have occurred in northern Venezuela since the Miocene.

The Genesis and Internal Dynamics of El Salvador's People's Revolutionary Army, 1970–1976

2014 ◽  
Vol 38 (01) ◽  
pp. 102-129
Author(s):  
ALBERTO MARTÍN ÁLVAREZ ◽  
EUDALD CORTINA ORERO
Keyword(s):  
Latin America ◽  
El Salvador ◽  
Early Years ◽  
Left Wing ◽  
Internal Dynamics ◽  
Internal Coherence ◽  
The 1960S

AbstractUsing interviews with former militants and previously unpublished documents, this article traces the genesis and internal dynamics of the Ejército Revolucionario del Pueblo (People's Revolutionary Army, ERP) in El Salvador during the early years of its existence (1970–6). This period was marked by the inability of the ERP to maintain internal coherence or any consensus on revolutionary strategy, which led to a series of splits and internal fights over control of the organisation. The evidence marshalled in this case study sheds new light on the origins of the armed Salvadorean Left and thus contributes to a wider understanding of the processes of formation and internal dynamics of armed left-wing groups that emerged from the 1960s onwards in Latin America.

Culture and the plasticity of perception

2020 ◽  
Vol 43 ◽  
Author(s):  
Michael Lifshitz ◽  
T. M. Luhrmann
Keyword(s):  
Cultural Context ◽  
Sensory Experience ◽  
Cultural Learning ◽  
The World

Abstract Culture shapes our basic sensory experience of the world. This is particularly striking in the study of religion and psychosis, where we and others have shown that cultural context determines both the structure and content of hallucination-like events. The cultural shaping of hallucinations may provide a rich case-study for linking cultural learning with emerging prediction-based models of perception.

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