scholarly journals Evolution of marginal populations of an invasive vine increases the likelihood of future spread

2015 ◽  
Vol 209 (4) ◽  
pp. 1773-1780 ◽  
Author(s):  
Francis F. Kilkenny ◽  
Laura F. Galloway
Keyword(s):  
Marginal Populations

Psychotherapy and Psychoanalysis with Marginal Populations: A Note on Observing and Adapting to Local Culture

1996 ◽  
Vol 79 (3) ◽  
pp. 875-880
Author(s):  
Anne Bar-Din
Keyword(s):  
Psychoanalytic Theory ◽  
Local Culture ◽  
Marginal Populations ◽  
Poor Families ◽  
Object Relationships

Psychoanalytic theory and psychotherapy for corrective object relationships as adapted for use with children of very poor families is described.

scholarly journals Intrapopulational genetic differentiation in Anopheles (N.) darlingi Root, 1926 (Diptera: Culicidae) in the amazon region

1999 ◽  
Vol 22 (3) ◽  
pp. 325-331 ◽  
Author(s):  
Joselita Maria Mendes dos Santos ◽  
Jorge Arturo Lobo ◽  
Wanderli Pedro Tadei ◽  
Eucleia P. Betioli Contel
Keyword(s):  
Genetic Differentiation ◽  
Central Region ◽  
Amazon Basin ◽  
Amazon Region ◽  
Anopheles Darlingi ◽  
Chromosomal Variation ◽  
Geographical Differentiation ◽  
Marginal Populations ◽  
Polymorphic Loci

Four natural Amazonian Anopheles darlingi populations were analyzed for 19 loci, 12 of which showed variation, i.e., 68.4% of polymorphic loci. The Ariquemes, Rondônia, population was the most variable, with a large number of alleles per locus (2.26 ± 0.27) and high polymorphism (P = 63.15). The highest values of observed and expected intralocus heterozygosity were observed in the Manaus, Amazonas, population (Ho = 0.432 ± 0.11; He = 0.375 ± 0.08), and the lowest in the Cachoeira Porteira, Pará, population (Ho = 0.236 ± 0.09; He = 0.290 ± 0.11). Wright's F-statistic revealed disequilibrium caused by an excess of homozygotes, as shown by the Fis > Fst values (Fis = 0.083 > 0.026) reflecting intrapopulational differentiation. The four populations studied were genetically similar, as indicated by distance and similarity values. Chromosomal variation of Amazon population also did not indicate geographical differentiation, and populations in the central region of the Amazon Basin showed high polymorphism in relation to the marginal populations, which were mainly monomorphic.

scholarly journals Use and abuse of the planet in non-rich regions: histories of fracking and windmills in a more than human geographical perspective

2022 ◽  
Vol 8 (1) ◽  
pp. 1-15
Author(s):  
Angel Paniagua ◽  
Keyword(s):  
Vulnerable Populations ◽  
Energy Production ◽  
Human Geography ◽  
Spatial Relationships ◽  
Marginal Populations ◽  
National Policies ◽  
Local Elites ◽  
Resistance Strategies ◽  
Local Populations ◽  
Marginal Areas

<abstract> <p>Remote and marginal areas with scarce and vulnerable populations are "comfortable" settings and suitable places for the development of new extractive activities for energy production. Fracking and modern windmills are often controversial activities in marginal areas for native and local populations, with varying political positions from local elites. The new scalar policies associated with the energy project introduce some of the resistance strategies in the form of more than human geographies or hybrid spatial relationships that characterize recent human geography. This paper explores and suggests possible ways of integrating local interests with regional or national policies based on the "health" of marginal populations, marginal rather than human materiality's and marginal more-than-human.</p> </abstract>

Structure of genetic diversity in marginal populations of black poplar (Populus nigra L.)

2015 ◽  
Vol 61 ◽  
pp. 297-302 ◽  
Author(s):  
Dechun Jiang ◽  
Guili Wu ◽  
Kangshan Mao ◽  
Jianju Feng
Keyword(s):  
Genetic Diversity ◽  
Populus Nigra ◽  
Marginal Populations ◽  
Black Poplar

scholarly journals Shift in ecological strategy helps marginal populations of shepherd's purse ( Capsella bursa-pastoris ) to overcome a high genetic load

2020 ◽  
Vol 287 (1927) ◽  
pp. 20200463 ◽  
Author(s):  
Marion Orsucci ◽  
Pascal Milesi ◽  
Johanna Hansen ◽  
Johanna Girodolle ◽  
Sylvain Glémin ◽  
...  
Keyword(s):  
Genetic Load ◽  
Fruit Production ◽  
Ecological Strategy ◽  
Phenotypic Characteristics ◽  
Invasive Ability ◽  
Marginal Populations ◽  
The Core ◽  
Trade Offs ◽  
Natural Range ◽  
The Relationship

The outcome of species range expansion depends on the interplay of demographic, environmental and genetic factors. Self-fertilizing species usually show a higher invasive ability than outcrossers but selfing and bottlenecks during colonization also lead to an increased genetic load. The relationship between genomic and phenotypic characteristics of expanding populations has, hitherto, rarely been tested experimentally. We analysed how accessions of the shepherd's purse, Capsella bursa-pastoris , from the colonization front or from the core of the natural range performed under increasing density of competitors. First, accessions from the front showed a lower fitness than those from the core. Second, for all accessions, competitor density impacted negatively both vegetative growth and fruit production. However, despite their higher genetic load and lower absolute performances, accessions from the front were less affected by competition than accessions from the core. This seems to be due to phenotypic trade-offs and a shift in phenology that allow accessions from the front to avoid competition.

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