Population structure of three woody species in four ethnic domains of the sub-sahel of Burkina Faso

2010 ◽  
Vol 22 (6) ◽  
pp. 519-529 ◽  
Author(s):  
T. K. Sop ◽  
J. Oldeland ◽  
U. Schmiedel ◽  
I. Ouedraogo ◽  
A. Thiombiano
Keyword(s):  
Population Structure ◽  
Burkina Faso ◽  
Woody Species

scholarly journals Population structure, inbreeding and admixture in local cattle populations managed by community‐based breeding programs in Burkina Faso

2021 ◽  
Author(s):  
Dominique Ouédraogo ◽  
Salifou Ouédraogo‐Koné ◽  
Bernadette Yougbaré ◽  
Albert Soudré ◽  
Bienvenue Zoma‐Traoré ◽  
...  
Keyword(s):  
Population Structure ◽  
Burkina Faso ◽  
Community Based ◽  
Breeding Programs

scholarly journals COMPARISON ON VEGETATION COMPOSITION AND STRUCTURE OF EXCLOSURES VS. OPEN GRAZING LANDS IN NORTHERN ETHIOPIA

2021 ◽  
Vol 9 (8) ◽  
pp. 70-99
Author(s):  
Samson Shimelse Jemaneh
Keyword(s):  
Population Structure ◽  
Species Richness ◽  
Plant Species ◽  
Woody Species ◽  
Soil Parameters ◽  
Northern Ethiopia ◽  
Indigenous Species ◽  
Regeneration Status ◽  
Composition And Structure ◽  
Grazing Lands

This study was conducted with the objectives of study investigates, compare, and try to describe the floristic composition and structure of the vegetation of exclosures and open grazing lands. A stratified preferential sampling design technique with flexible systematic model was used for data collection. Data on vegetation and environmental parameters were gathered from 120 quadrants (90 from restorations or exclosures of different ages and 30 from adjacent open grazing lands), of 20 m x 20 m (400 m2) size. Species richness and the presence or absence of herbaceous plants were recorded like soil samples in a 2 m x 2 m (4 m2) subplot inside each main quadrant from five points, one at each corner and one at the center.  A total of 142 plant species belonging to 118 genera and 52 families were identified. All exclosures displayed higher plant species richness, diversity, and aboveground standing biomass compared to the adjacent open grazing lands. Consideration of edaphic (e.g. soil total nitrogen, available phosphorus, CEC, exchangeable bases, soil pH and soil texture) and site (e.g. Stoniness, Grazing) variables will help to optimize the selection of areas for the establishment of future exclosures. Moreover, our study suggests that with time exclosures may increasingly obtain an important role as refugees and species pool similar to church forests and should be protected and managed in a sustainable manner. However, economic and social impacts of exclosures should be included in feasibility studies before establishing exclosures in the future.  Altitude, Grazing and some soil parameters like Mg were the major environmental factors in the division of the vegetation into plant community types. The result of the frequency distribution of woody species showed a high proportion of small-sized individuals in the lower diameter classes indicating good recruitment potential of the forest patches and the rare occurrence of large individuals. Such trend was probably caused by past disturbance of the original vegetation resulting in a succession of secondary vegetation. In addition, the analysis of species population structure indicated that some tree species had abnormal population structure with no or few individuals at lower size classes. Moreover, assessment of regeneration status on the basis of age classes indicated that significant proportion of woody species were represented by few or no seedlings, entailing that they were under threat. Substantial numbers of forest species were found to have irregular population structure and are in reduced regeneration status. To prevent local extinction of these species, present efforts of nursery establishment and plantation of indigenous species in the exclosures should be strengthened and extended.

Germination requirements of seeds of four woody species from the Sudanian savanna in Burkina Faso, West Africa

2005 ◽  
Vol 33 (3) ◽  
pp. 581-593 ◽  
Author(s):  
D. Zida ◽  
M. Tigabu ◽  
L. Sawadogo ◽  
P.C. Oden
Keyword(s):  
West Africa ◽  
Burkina Faso ◽  
Woody Species ◽  
Germination Requirements

scholarly journals Floristic Diversity, Population Structure, Regeneration Status and Socio-Economic Importance of Fach Forest, South Gondar, Northwestern Ethiopia

2021 ◽  
Author(s):  
Haileab Zegeye
Keyword(s):  
Population Structure ◽  
Protected Area ◽  
Woody Species ◽  
Local Communities ◽  
Economic Importance ◽  
Livestock Grazing ◽  
Anthropogenic Factors ◽  
Sacred Places ◽  
Regeneration Status ◽  
Management Interventions

Abstract Background: The remaining natural forests of Ethiopia are only small patches mostly confined to inaccessible areas and sacred places. Fach forest is one of the remnant dry evergreen Afromontane forests (DAFs) in northwestern Ethiopia. There is lack of information on the vegetation ecology of the forest. Thus, the present study was conducted to investigate the floristic composition and diversity, population structure, regeneration status and socio-economic importance of Fach forest, and the anthropogenic factors affecting it.Methods: Vegetation data were collected from a total of 34 plots, measuring 20 m × 20 m (400 m2) each and established along line transects approximately at 100 m intervals. A general survey consisting of field observations, key-informant interviews and Focus Group Discussion (FGD) was used to collect socio-economic data. Results: A total of 230 vascular plant species belonging to 183 genera and 76 families were recorded from the study area, of which 45 (19.57%) were trees, 62 (26.97%) trees/shrubs, 37 (16.09%) shrubs, 13 (5.65%) woody climbers, 10 (4.35%) herbaceous climbers, and 63 (27.39%) herbs. The family with the highest number of species was Fabaceae (28 species, 12.17% of all species), followed by Asteraceae (18 species, 7.83%), Poaceae (13 species, 5.65%), and Acanthaceae and Euphorbiaceae (9 species each). The Shannon-Wiener diversity and evenness values of woody species were 3.53 and 0.72, and the total density and basal area 4938.24 individuals ha-1 and 19.17 m2 ha-1, respectively. The species with the highest Importance Value Index (IVI) value was Combretum molle (25.26%), followed by Olea europaea subsp. cuspidata (21.19%), Dodonaea angustifolia (17.80%), and Calpurnia aurea (15.05%). The local communities were highly dependent on the forest for fuelwood, construction material, charcoal, timber and farm implements, as well as food (edible fruits), medicines, fodder, and bee forage. Fach forest is a protected area and contains sacred places, but at present it is dwindling mainly due to livestock grazing/browsing, tree cutting for various purposes, farmland expansion, rural settlements expansion, urbanization, fire incidences, and exotic species plantations at the expense of the natural forest, as well as soil erosion and climate change.Conclusions: Fach forest possesses high plant diversity and endemism. Woody species having low IVI values and poor regeneration status (as indicated by the Diameter at Breast Height [DBH] class distributions) need high priority for conservation. Fach forest has been maintained to the present-day through the combined indigenous (sacred grove) and modern (protected area system) conservation methods, but is now under increasing human pressure. Therefore, effective conservation and management interventions are urgently needed to ensure the long-term maintenance of the forest ecosystem, and benefit the local communities through sustainable utilization of the forest.

scholarly journals Effets combinés des facteurs anthropiques et climatiques sur l’état des populations de trois espèces ligneuses vulnérables

2020 ◽  
Vol 14 (5) ◽  
pp. 1763-1785
Author(s):  
Lassina Traore ◽  
Oumarou Sambare ◽  
Salfo Savadogo ◽  
Amadé Ouedraogo ◽  
Adjima Thiombiano
Keyword(s):  
Burkina Faso ◽  
Protected Areas ◽  
Species Conservation ◽  
Woody Species ◽  
Anthropogenic Pressure ◽  
Vulnerable Species ◽  
Climatic Gradient ◽  
Detarium Microcarpum ◽  
Significant Difference ◽  
Juvenile Individual

Les facteurs climatiques et anthropiques sont à l’origine de la régression de la population de nombreuses espèces ligneuses en zone soudanienne. Anogeissus leiocarpa, Bombax costatum et Detarium microcarpum sont des espèces qui ont une importance socio-économique avérée et donc elles se révèlent être vulnérables. L’évaluation comparée de l’état des peuplements des trois espèces dans les aires protégées et non protégées suivant le gradient climatique permettra de disposer d’informations utiles pour leur gestion durable. La structure des populations a été évaluée à partir d’inventaires forestiers basés sur un échantillonnage aléatoire à travers des parcelles rectangulaires de 1000 m². Les individus dont le diamètre du tronc à 1,3 m de hauteur est supérieur ou égal à 5 cm ont été mesurés. La régénération (individus à D1,3 m < 5 cm) a été comptée par classe de hauteur dans des sous-placettes de 25 m². Les densités et les surfaces terrières des trois espèces varient significativement suivant le gradient de protection dans chaque secteur climatique. A. leiocarpa et D. microcarpum possèdent de bonnes structures démographiques dans les deux secteurs climatiques soudaniens, indépendamment du type d’utilisation de terres. Seule la densité de B. costatum montre une différence significative le long du gradient climatique entre les aires protégées. L’étude révèle l’importance des aires protégées dans la conservation de ces espèces vulnérables.Mots clés : Burkina Faso, zone soudanienne, aires protégées, aires non protégées, espèces vulnérables, conservation.   Climate and land use types are mainly responsible for the decline of many woody species in Sudanian areas. Anogeissus leiocarpa, Bombax costatum and Detarium microcarpum are high-value but vulnerable species due to the anthropogenic pressure. The compared assessment of the state of the targeted species in the protected and unprotected areas along the climatic gradient will provide information that could help implementing sustainable management of these species. The population structures were evaluated from forest inventories based on a random sampling through rectangular plots of 1000 m². The adult individuals of each species with diameters ≥ 5 cm at 1.30 m of heigh were measured. The juvenile individual with diameters that were less than 5 cm were counted and classified into height classes within plots size of 25 m². The structural characteristic of the targeted species vary significantly between land uses within each climatic zone. A. leiocarpa and D. microcarpum showed a stable population structure between the two climatic sectors, irrespective of management regimes. Only density of B. costatum shows a significant difference in the PAs and along climatic gradient. The study reveals the importance of protected areas for these vulnerable species conservations.Keywords: Burkina Faso, Sudanian zone, protected areas, unprotected areas, vulnerable species, conservation.

Genetic analysis and population structure of the Anopheles gambiae complex from different ecological zones of Burkina Faso

2020 ◽  
Vol 81 ◽  
pp. 104261
Author(s):  
Abdou Azaque Zouré ◽  
Grégoire Noël ◽  
Aboubacar Sombié ◽  
Zéphirin Somda ◽  
Athanase Badolo ◽  
...  
Keyword(s):  
Population Structure ◽  
Genetic Analysis ◽  
Burkina Faso ◽  
Anopheles Gambiae ◽  
Gambiae Complex ◽  
Ecological Zones ◽  
Anopheles Gambiae Complex

Woody species composition, diversity and vegetation structure of two protected areas along a climatic gradient in Burkina Faso (West Africa)

2019 ◽  
Vol 54 (3-4) ◽  
pp. 163-175
Author(s):  
Moussa Ganamé ◽  
Philippe Bayen ◽  
Issaka Ouédraogo ◽  
Kangbéni Dimobe ◽  
Adjima Thiombiano
Keyword(s):  
West Africa ◽  
Species Composition ◽  
Burkina Faso ◽  
Protected Areas ◽  
Vegetation Structure ◽  
Woody Species ◽  
Climatic Gradient
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