Impact of land-use type and harvesting on population structure of a non-timber forest product-providing tree in a semi-arid savanna, West Africa

Schumann, Katharina; Wittig, Rüdiger; Thiombiano, Adjima; Becker, Ute; Hahn, Karen

doi:10.1016/j.biocon.2011.06.018

Cited by 59 publications

(32 citation statements)

References 34 publications

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“…We expected a higher proportion of 'ageing' populations with flat or positive SCD slopes on fallows and fields, as found in previous studies (Gouwakinnou et al, 2009;Schumann et al, 2011). From the fourteen tree populations on fallows and fields where SCD regressions could be calculated, though, significant negative slopes indicated the occurrence of recruitment in thirteen cases; only A. polyacantha had an 'ageing' population on fallows.…”

Section: 'Juveniles Get Killed'? -Challenging a Basic Assumption Of Ssupporting

confidence: 71%

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Caught in a human disturbance trap: Responses of tropical savanna trees to increasing land-use pressure

Ouédraogo

Bondé

Boussim

et al. 2015

Forest Ecology and Management

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Section: 'Juveniles Get Killed'? -Challenging a Basic Assumption Of Ssupporting

confidence: 71%

“…This sequence has been frequently used to evaluate increasing levels of human disturbance on the tree layer of West African savanna landscapes (e.g. Kelly et al, 2004;Kindt et al, 2008;Schumann et al, 2011). Fields represent the highest level of human disturbance .…”

Section: Study Design and Data Collectionmentioning

confidence: 99%

Caught in a human disturbance trap: Responses of tropical savanna trees to increasing land-use pressure

Ouédraogo

Bondé

Boussim

et al. 2015

Forest Ecology and Management

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“…These constraints could be abiotic, such as shade, excess light, heat, water stress, and flooding, or biotic, such as allelopathy, browsing, herbivores, seed predation, and soil-borne pathogens (Guariguata and Pinard, 1998;Kitajima and Fenner, 2000;Harmer, 2001;Harrington and Bluhm, 2001;McLaren and McDonald, 2003;Torres et al, 2008). Further, anthropogenic constraints such as land-use, fuel-wood and timber extraction as well as the extraction of non-timber products are also known to negatively impact natural generative regeneration (Lykke, 1998;Bhuyan et al, 2003;Raebild et al, 2007;Pare et al, 2009;Avocèvou-Ayisso et al, 2009;Schumann et al, 2011). Studies provide evidence that when multiple biotic and abiotic constraints are present, the negative effects on regeneration of seeds can be amplified (Gutiérrez-Granados et al, 2011).…”

Section: Factors Reported Constraining the Natural Regeneration Of Spmentioning

confidence: 99%

Spondias tuberosa Arruda (Anacardiaceae), a threatened tree of the Brazilian Caatinga?

et al. 2016

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Spondias tuberosa Arr., a fructiferous tree endemic to the northeast Brazilian tropical dry forest called Caatinga, accounts for numerous benefits for its ecosystem as well as for the dwellers of the Caatinga. The tree serves as feed for pollinators and dispersers as well as fodder for domestic ruminants, and is a source of additional income for local smallholders and their families. Despite its vantages, it is facing several man-made and natural threats, and it is suspected that S. tuberosa could become extinct. Literature review suggests that S. tuberosa suffers a reduced regeneration leading to population decrease. At this juncture S. tuberosa cannot be considered threatened according to the International Union for Conservation of Nature Red List Categories and Criteria, as it has not yet been assessed and hampered generative regeneration is not considered in the IUCN assessment. The combination of threats, however, may have already caused an extinction debt for S. tuberosa. Due to the observed decline in tree density, a thorough assessment of the S. tuberosa population is recommended, as well as a threat assessment throughout the entire Caatinga.Keywords: Spondias tuberosa, natural regeneration, conservation, IUCN red list, Caatinga.Spondias tuberosa Arruda (Anacardiaceae), uma árvore ameaçada de extinção da Caatinga?Resumo Spondias tuberosa Arr., é uma árvore frutífera endêmica da Caatinga, floresta seca tropical localizada no Nordeste do Brasil. A árvore traz diversos benefícios para o ecossistema e para a população local. Ela serve de alimento tanto para polinizadores e dispersores quanto para ruminantes domésticos e é fonte de renda extra para os agricultores familiares da região. Apesar de seus benefícios, esta árvore enfrenta várias ameaças naturais e antrópicas que podem levar a sua extinção. A revisão da literatura científica sugere que S. tuberosa sofre de reduzida capacidade de regeneração, o que leva à diminuição da população. Todavia, S. tuberosa não é considerada uma espécie ameaçada de extinção de acordo com as categorias e critérios da Lista Vermelha da União Internacional para a Conservação da Natureza, já que a espécie ainda não foi avaliada e capacidade regenerativa reduzida não é considerado critério pelo UICN. A combinação de ameaças, entretanto, pode já ter levado ao débito de extinção da S. tuberosa. Devido ao declínio observado da densidade das árvores, recomenda-se uma avaliação completa da população de S. tuberosa e uma avaliação de todas as ameaças sofridas pela árvore na Caatinga.Palavras-chave: Spondias tuberosa, regeneracao natural, conservação, lista vermelha da UICN, Caatinga.

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“…De Caluwé et al (2009) found significant differences in use values and use patterns of baobab (Adansonia digitata) between the Ottamari and the Dendi in Northern Benin, where Fandohan et al (2010) found differences between ethnic groups with regard to knowledge of Tamarindus indica. In the Sudanian zone of Burkina Faso, Schumann (2011) identified differences in baobab uses among Gulimanceba villages. Gouwakinnou et al (2011) noted variations among different locations in usage of products of Sclerocarya birrea.…”

Section: Introductionmentioning

confidence: 99%

Local Values, Social Differentiation and Conservation Efforts: The Impact of Ethnic Affiliation on the Valuation of NTFP-Species in Northern Benin, West Africa

Heubach

Wittig

Nuppenau³

et al. 2013

Hum Ecol

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Non-timber forest products contribute significantly to rural livelihoods in the West African savannas. This study investigates differences in use preferences for native woody species in six categories of plant use and their economic returns among five ethnic groups in Northern Benin. Ethnobotanical survey data from 230 households revealed that both ethnic affiliation and location significantly impact species' valuation. Of a total of 90 species, 61 % were used for medicinal applications, 41 % as firewood, 39 % for construction, and 32 % as human foods. While certain plant species were used by all rural dwellers, others were used exclusively by particular ethnic groups. Vitellaria paradoxa, Parkia biglobosa and Adansonia digitata are key economic species for all groups. Conservation measures should consider multi-purpose trees fulfilling subsistence and cash needs while taking into consideration cultural differences in use preferences.

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Impact of land-use type and harvesting on population structure of a non-timber forest product-providing tree in a semi-arid savanna, West Africa

Cited by 59 publications

References 34 publications

Caught in a human disturbance trap: Responses of tropical savanna trees to increasing land-use pressure

Caught in a human disturbance trap: Responses of tropical savanna trees to increasing land-use pressure

Spondias tuberosa Arruda (Anacardiaceae), a threatened tree of the Brazilian Caatinga?

Local Values, Social Differentiation and Conservation Efforts: The Impact of Ethnic Affiliation on the Valuation of NTFP-Species in Northern Benin, West Africa

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