Genetic structure, relatedness and helping behaviour in the yellow mongoose in a farmland and a natural habitat

2009 ◽  
Vol 278 (1) ◽  
pp. 57-64 ◽  
Author(s):  
T. N. C. Vidya ◽  
Z. Balmforth ◽  
A. Le Roux ◽  
M. I. Cherry
Keyword(s):  
Genetic Structure ◽  
Natural Habitat ◽  
Helping Behaviour ◽  
Yellow Mongoose

scholarly journals Genetic structure of remnant black poplar (Populus nigra L.) populations along biggest rivers in Serbia assessed by SSR markers

2016 ◽  
Vol 65 (1) ◽  
pp. 12-19 ◽  
Author(s):  
Dijana Čortan ◽  
Hilke Schroeder ◽  
Mirjana Šijačić-Nikolić ◽  
Christian Wehenkel ◽  
Matthias Fladung
Keyword(s):  
Genetic Variation ◽  
Genetic Structure ◽  
Natural Habitat ◽  
Allelic Diversity ◽  
Keystone Species ◽  
Significant Loss ◽  
Populus Nigra ◽  
Fixation Index ◽  
Black Poplar ◽  
Western Asia

AbstractBlack poplar (Populus nigra L.) is a keystone species of riparian softwood forests along riversides in vast areas of Europe, Western Asia and Northern Africa. Since the end of the 20thcentury, black poplar has been recognized as an endangered species throughout Europe due to the loss of its natural habitat and possible crossbreeding with hybrid poplars. Using twelve nuclear SSR loci, we analysed the genetic structure of four native populations from three river valleys in the northern part of Serbia. All tested loci were highly polymorphic, displaying 8 to 25 alleles per locus, overall 179 detected alleles and an average effective number of alleles 5.87. Observed heterozygosity (overall Ho = 0.703) has been lower than the expected (overallHe= 0.808) in each population, which indicates positive mean of fixation index values (overallFis> 0 (0.132)). An AMOVA analysis revealed that the highest degree of genetic variation occurred within populations (95.33 %) while the genetic variation between populations was really low (4.67 %). High gene flow and no significant loss of allelic diversity have been recorded in the studied populations in Serbia.

scholarly journals Allozymic Genetic Structure and Natural Habitat Fragmentation: Data for Five Species of Amazonian Forest Birds

The Condor ◽  
2000 ◽  
Vol 102 (4) ◽  
pp. 770-783 ◽  
Author(s):  
John M. Bates
Keyword(s):  
Genetic Structure ◽  
Genetic Differentiation ◽  
Natural Habitat ◽  
Local Scale ◽  
Forest Understory ◽  
Forest Fragments ◽  
Continuous Forest ◽  
Understory Birds ◽  
Areas Of Endemism ◽  
Level I

Abstract I studied allozymic variation in five species of Amazonian birds at two geographic scales. At a local scale (all sites within 200 km of one another), I included samples from six sites, three within continuous forest and three in natural forest fragments thought to be several thousand years old. I examined both genetic variation and differentiation to determine whether there were genetic effects related to forest fragmentation. At this local scale, I found little evidence in the allozymic data that clearly suggested genetic structure had been affected in any uniform pattern among species. However, there was genetic differentiation at this level and estimated gene flow (Nmest from private alleles) was low relative to what is reported in other avian studies. At the regional level, I compared samples from sites that were 500–1,500 km from one another from two Amazonian areas of endemism (Inambari and Rondônia). Four of the five species exhibited substantial differentiation between samples from the two areas of endemism, consistent with other studies of genetic differentiation in Neotropical forest understory birds.

scholarly journals Influence of natural habitat fragmentation on the genetic structure of Canarian populations of Juniperus turbinata

Silva Fennica ◽  
2017 ◽  
Vol 51 (2) ◽  
Author(s):  
Juan F. Jimenez ◽  
Pedro Sánchez-Gómez ◽  
Jose Luis Cánovas ◽  
Isabell Hensen ◽  
Miloud Aouissat
Keyword(s):  
Genetic Structure ◽  
Habitat Fragmentation ◽  
Natural Habitat

Effect of Iron Limitation on the Ultrastructure of Agmenellum Quadruplicatum

1981 ◽  
Vol 39 ◽  
pp. 410-411
Author(s):  
L. P. Hardie ◽  
D. L. Balkwill ◽  
S. E. Stevens
Keyword(s):  
Growth Medium ◽  
Green Alga ◽  
Natural Habitat ◽  
Iron Limitation ◽  
Natural Environments ◽  
Blue Green Alga ◽  
Marine Cyanobacterium ◽  
Natural Systems ◽  
Thin Sectioning ◽  
Agmenellum Quadruplicatum

Agmenellum quadruplicatum is a unicellular, non-nitrogen-fixing, marine cyanobacterium (blue-green alga). The ultrastructure of this organism, when grown in the laboratory with all necessary nutrients, has been characterized thoroughly. In contrast, little is known of its ultrastructure in the specific nutrient-limiting conditions typical of its natural habitat. Iron is one of the nutrients likely to limit this organism in such natural environments. It is also of great importance metabolically, being required for both photosynthesis and assimilation of nitrate. The purpose of this study was to assess the effects (if any) of iron limitation on the ultrastructure of A. quadruplicatum. It was part of a broader endeavor to elucidate the ultrastructure of cyanobacteria in natural systemsActively growing cells were placed in a growth medium containing 1% of its usual iron. The cultures were then sampled periodically for 10 days and prepared for thin sectioning TEM to assess the effects of iron limitation.

THE CLASSIFICATION OF LAND ACCORDING TO THE DEGREE OF RABBIT INFESTATION IN CENTRAL OTAGO

1987 ◽  
pp. 65-70
Author(s):  
I.G.C. Kerr ◽  
J.M. Williams ◽  
W.D. Ross ◽  
J.M. Pollard
Keyword(s):  
Carrying Capacity ◽  
Mediterranean Climate ◽  
Natural Habitat ◽  
Public Funding ◽  
Soil Survey ◽  
European Rabbit ◽  
Cultural Modification ◽  
Classification Information ◽  
Semi Arid

The European rabbit (Oryctolagus cuniculus) introduced into New Zealand in the 183Os, has consistently flourished in Central Otago, the upper Waitaki, and inland Marlborough, all areas of mediterranean climate. It has proved difficult to manage in these habitats. The 'rabbit problem' is largely confined to 105,000 ha of low producing land mostly in semi arid areas of Central Otago. No field scale modifications of the natural habitat have been successful in limiting rabbit numbers. The costs of control exceed the revenue from the land and continued public funding for control operations appears necessary. A system for classifying land according to the degree of rabbit proneness is described. Soil survey and land classification information for Central Otago is related to the distribution and density of rabbits. This intormation can be used as a basis for defining rabbit carrying capacity and consequent land use constraints and management needs. It is concluded that the natural rabbit carrying capacity of land can be defined by reference to soil survey information and cultural modification to the natural vegetation. Classification of land according to rabbit proneness is proposed as a means of identifying the need for, and allocation of, public funding tor rabbit management. Keywords: Rabbit habitat, rabbit proneness, use of rabbit prone land.

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