Plant biodiversity patterns along a climatic gradient and across protected areas in West Africa

2018 ◽  
Vol 56 (3) ◽  
pp. 641-652 ◽  
Author(s):  
Sié Sylvestre Da ◽  
Jaime Ricardo García Márquez ◽  
Jan Henning Sommer ◽  
Adjima Thiombiano ◽  
Georg Zizka ◽  
...  
Keyword(s):  
West Africa ◽  
Protected Areas ◽  
Plant Biodiversity ◽  
Climatic Gradient ◽  
Biodiversity Patterns

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

Efficiency of two contrasted marine protected areas (MPA) in West Africa over a decade of fishing closure

2021 ◽  
Vol 210 ◽  
pp. 105655
Author(s):  
Modou Thiaw ◽  
Didier Gascuel ◽  
Oumar Sadio ◽  
Ismaïla Ndour ◽  
Hamet Diaw Diadhiou ◽  
...  
Keyword(s):  
West Africa ◽  
Protected Areas ◽  
Marine Protected Areas

The influence of termite-induced heterogeneity on savanna vegetation along a climatic gradient in West Africa

2012 ◽  
Vol 29 (1) ◽  
pp. 11-23 ◽  
Author(s):  
Arne Erpenbach ◽  
Markus Bernhardt-Römermann ◽  
Rüdiger Wittig ◽  
Adjima Thiombiano ◽  
Karen Hahn
Keyword(s):  
West Africa ◽  
Plant Species ◽  
Large Scale ◽  
Regional Scale ◽  
Soil Conditions ◽  
Soil Parameters ◽  
Climatic Gradient ◽  
Termite Mound ◽  
Savanna Vegetation ◽  
Bioclimatic Variables

Abstract:Termites are renowned ecosystem engineers. Their mounds have been described as an important element of savanna vegetation dynamics, but little is known about their large-scale impact on vegetation composition. To investigate the influence of termite-induced heterogeneity in savannas along a climatic gradient in West Africa termite mound vegetation was compared with adjacent savanna vegetation using 256 paired plots (size of the termite mound and a corresponding savanna area) in five protected areas from northern Burkina Faso to northern Benin. On each plot vegetation and soil sampling was performed. Additionally bioclimatic variables from the WORLDCLIM database were used. The vegetation on the mounds and the surrounding savanna differed within all study sites (DCA length of gradient 3.85 SD) and showed complete turnover along the climatic gradient (DCA length of gradient 5.99 SD). Differences between mounds and savanna were significantly related to termite-induced changes in soil parameters, specifically clay enrichment and increased cation concentrations (base saturation). On a local scale, termite-induced differences in soil conditions were found to be the most important factor affecting mound vegetation, while on a regional scale, annual precipitation showed the strongest significant correlations. However, with increasing precipitation, differences between mounds and the surrounding matrix became more pronounced, and the contribution of mounds to local phytodiversity increased. Eleven plant species were identified as characteristic termite mound species. In the more humid parts of the gradient, more characteristic plant species were found that may benefit from favourable soil conditions, good water availability, and a low fire impact in the mound microhabitat.

Increased isolation of two Biosphere Reserves and surrounding protected areas (WAP ecological complex, West Africa)

2007 ◽  
Vol 15 (1) ◽  
pp. 26-40 ◽  
Author(s):  
Nicola Clerici ◽  
Antonio Bodini ◽  
Hugh Eva ◽  
Jean-Marie Grégoire ◽  
Dominique Dulieu ◽  
...  
Keyword(s):  
West Africa ◽  
Protected Areas ◽  
Biosphere Reserves ◽  
Ecological Complex

scholarly journals Vulnérabilité des ptéridophytes au changement climatique et implications pour leur conservation au Togo (Afrique de l’Ouest)

2020 ◽  
Vol 153 (1) ◽  
pp. 22-32
Author(s):  
Komla Elikplim Abotsi ◽  
Kouami Kokou ◽  
Germinal Rouhan ◽  
Vincent Deblauwe
Keyword(s):  
Climate Change ◽  
West Africa ◽  
Protected Areas ◽  
Ecological Groups ◽  
Afrique De L’Ouest ◽  
Changement Climatique ◽  
Changements Climatiques ◽  
Temperature Seasonality ◽  
The Impact ◽  
Afrique De L'ouest

Contexte et objectifs – La conservation durable de la biodiversité requiert une bonne compréhension des causes de son déclin. Mis à part les activités humaines, les changements climatiques se révèlent comme la principale menace qui pèse sur la biodiversité au 21ème siècle. Notre étude vise à déterminer l’impact du changement climatique sur les Ptéridophytes au Togo.Méthodologie – En se basant sur 2865 occurrences de Ptéridophytes couvrant toute l’Afrique de l’Ouest et regroupés en 5 groupes écologiques, les distributions actuelle et future des Ptéridophytes ont été modélisées grâce à Maxent. La capacité de conservation des aires protégées du Togo vis-à-vis de ces plantes a été évaluée.Résultats clés – Nos résultats montrent que 9,81% du pays peut abriter simultanément l’ensemble des groupes de ptéridophytes. Les précipitations des périodes sèches, l’isothermalité et la saisonnalité de la température sont les variables climatiques qui contraignent le plus leurs niches en Afrique de l’Ouest et particulièrement au Togo. Exceptés les taxons thermophiles dont les zones climatiquement favorables devraient quasiment doubler à l’horizon 2070, les niches des autres groupes devraient se restreindre drastiquement au Togo. Seules les aires protégées du tiers sud des Monts Togo pourront garantir la conservation des niches climatiques actuelles et futures des ptéridophytes dans le pays.Conclusions – Le sud des Monts Togo constituera probablement un refuge climatique pour les ptéridophytes au Togo. Toutefois, la faiblesse de l’étendue des aires protégées dans cette partie du pays pourrait constituer une source de vulnérabilité pour ces plantes.   Vulnerability of pteridophytes to climate change and implications for their conservation in Togo (west Africa)   Background and aims – The sustainable conservation of biodiversity requires a good understanding of the causes of its decline. Apart from human activities, climate change is the major threat to global biodiversity during the 21st century. Our study aims to determine the impact of climate change on pteridophytes in Togo.Methods – Based on 2865 occurrences of pteridophytes covering West Africa and grouped into 5 ecological groups, current and future distributions of pteridophytes were modelized using Maxent. The conservation capacity of Togolese protected areas for these plants was assessed.Key results – Our results show that 9.81% of the country can shelter simultaneously all groups of pteridophytes. Precipitations of the driest periods, isothermality and temperature seasonality are the climatic variables which constrain the most their niche in West Africa and particularly in Togo. Apart from thermophilic taxa whose climatically suitable niche is expected to nearly double by 2070, niche of all other group should be drastically restricted in Togo. Only protected areas in the southern third of Togo Mountains would guarantee current and future climatic niches for pteridophytes in the country.Conclusions – Southern Togo Mountains will probably constitute a climatic refugium for Pteridophytes in Togo. However, the small extent of protected areas in this part of the country would be a source of vulnerability for these plants.

scholarly journals Agriculture is the primary driver of tree cover loss across the Forestière region of the Republic of Guinea, Africa

2021 ◽  
Author(s):  
Maegan Fitzgerald ◽  
Janet Nackoney ◽  
Peter V Potapov ◽  
Svetlana Turubanova
Keyword(s):  
West Africa ◽  
Change Detection ◽  
Protected Areas ◽  
Spatial Data ◽  
Tree Cover ◽  
Conservation Strategies ◽  
Forest Change ◽  
Mammal Species ◽  
Detection Model ◽  
Primary Driver

Abstract Biodiversity hotspots are conservation priority areas that feature exceptionally high levels of species endemism and high levels of habitat loss. The Guinean Forests of West Africa hotspot, home to a quarter of all the mammal species of Africa, has experienced high levels of forest loss within its protected areas. Here, we analyzed tree cover loss and its proximate drivers within Guinée Forestière, a high biodiversity region within the Guinean Forests of West Africa hotspot, both inside and outside protected areas. Using Landsat analysis ready data and a regionally calibrated, annual forest change detection model, we mapped tree cover loss occurring across this region from 2000 to 2018. We quantified the area of tree cover loss and identified proximate drivers using a statistical sample of reference data. The total tree cover loss in Guinée Forestière between years 2000 and 2018 was 10,907 km2 (SE 889 km2), which consists of approximately 25% of the region’s total land area. Of this total loss, 364 km2 (SE 91 km2) occurred within protected areas of high biodiversity value. Tree cover loss was not consistent across high biodiversity areas and did not appear to be related to protected area classification. Smallholder agriculture (subsistence and cash crop farming) was the primary driver of tree cover loss across Guinée Forestière. This research provides multitemporal spatial data on tree cover dynamics that is required for effective implementation of sustainable management and biodiversity conservation strategies within the broader socioecological landscape of Guinée Forestière. We also highlight important limitations to consider and address when using remote sensing to automate change detection across landscapes.

scholarly journals Termites (Blattodea Latreille 1810, Termitoidae Latreille 1802) of Abuko Nature Reserve, Nyambai Forest Park and Tanji Bird Reserve (The Gambia)

Insects ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 122
Author(s):  
Abdoulaye Baila Ndiaye ◽  
Ebrima Njie ◽  
Paul A. Correa
Keyword(s):  
West Africa ◽  
Protected Areas ◽  
Nature Reserve ◽  
The Gambia ◽  
Western Region ◽  
Termite Species ◽  
Forest Park ◽  
Ecological Information ◽  
Macrotermes Bellicosus ◽  
Amitermes Evuncifer

From 28 October to 5 November 2013, a termite study was undertaken in 3 protected sites in The Gambia (West Africa). The aim of the study is to investigate the diversity of termites in three protected areas in the western region of the country. Termite sampling is carried out in 100 m × 2 m transects that are replicated three (3) times in each site. A total of thirty-one (31) termite species, that belong to fungus growing (11), harvester (1), humuvorous (12) and xylophagous (7), were recorded. The following nineteen (19) species are new to The Gambia: Coptotermes intermedius, Astalotermes near quietus, Ancistrotermes cavithorax, Macrotermes bellicosus, Microtermes grassei, M. lepidus, M. subhyalinus, Odontotermes erraticus, O. pauperans, O. sudanensis, Basidentitermes sp., Euchilotermes tensus arcuata, Noditermes cristifrons, Amitermes evuncifer, Amitermes spinifer, Microcerotermes fuscotibialis, Microcerotermes near parvulus, Microcerotermes near solidus and Promirotermes holmgreni. Additional description and/or ecological information on Odontotermes erraticus, Cubitermes severus, Cubitermes n. proximatus, Euchilotermes tensus arcuata, Basidentitermes sp., and Noditermes cristifrons are given.

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.

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