Vegetation structure and effects of human use of Dambos ecosystem in northern Mozambique

Detalhes bibliográficos
Autor(a) principal: Mbanze, Aires Afonso
Data de Publicação: 2019
Outros Autores: Martins, Amade Mário, Rivaes, Rui, Ribeiro-Barros, Ana I., Ribeiro, Natasha Sofia
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.5/18219
Resumo: Original research article
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spelling Vegetation structure and effects of human use of Dambos ecosystem in northern MozambiqueDambos wetlandhorizontal and vertical structuresampling-based rarefactionspecies diversityindicators speciesOriginal research articleThe Niassa National Reserve (NNR) is the most extensive conservation area in Mozambique and the third largest in Africa, encompassing 42,000 km2 of endemic miombo vegetation. Dambos wetlands occur within the wooded grassland and grassland vegetation of NNR and provide a wide range of Ecosystem Services (ES), including life support for animal species, regulation of water flow and prevention of soil erosion. It also generates income for the livelihoods of local communities by providing land for agriculture and harvesting of non-timber products. The dynamics of these ecosystems is poorly understood despite the contribution of the dambos to global biodiversity and ES. This research is the first preliminary assessment of the vegetation structure and composition of six dambos within NNR, selected using Google Earth, MODIS satellite images and an exploratory field visit. Field data collection was performed using a two-stage systematic sampling approach, along transect lines of 100 10m (0.1 ha), perpendicular to the dambos' flow. Square plots of 0.25m2 were established for grass survey within the transects where grass vegetation was measured, counted and identified. Data were analyzed with R software. The sociological position of each species was analyzed with regard to the vertical structure while for horizontal structure, the abundance, dominance, frequency and Importance Value Index (IVI) were determined. In order to understand the differences between dambos, evenness (H) and reciprocal of Simpson's heterogeneity index (Hill's N2) were calculated. Principal Coordinates Analysis (PCoA) and Cluster Analysis were also used to characterize the surveyed species communities. A total of 58 transects (5.8 ha) and 336 subplots were assessed, recording 110 woody and 73 grass species, respectively. The most common tree species were Vitex doniana, Burkea africana, Syzygium cordatum and Annona senegalensis, while for grass vegetation the most abundant species were Andropogon eucomus and Helictotrichon turgidulum. According to the IVI, the most dominant tree and shrub species were V. doniana, Pseudolachnostylis maprouneifolia, A. senegalensis and S. cordatum. Homogeneity (Hill's N2 ¼18.92) and evenness (H¼ 4.27) were, on average, low in all dambos. Dambo 2 was the most heterogeneous (Hill's N2 ¼18.21) while dambo 1 was the least heterogeneous (Hill's N2 ¼ 5.71). Dambo 6 was most equitable (H¼ 1.35) whereas dambo 2 the least equitable (H¼ 3.72). Using species abundance and based on PCoA and cluster analysis, four main groups of dambos were identified based mainly on the water gradient, with data variation captured by the first three axes reaching almost 83%. The p-value (0.42), suggested no significant differences between species communities in the dambos, and thus, human disturbances appear not to be enough to modify dambos microenvironment. Accordingly, the results suggest that human activities, at this level, do not necessarily affect the structure and diversity of dambos in the NNR. The results also suggest that the species A. senegalensis, Combretum psidioides, Crossopteryx febrifuga, Protea nitida, P. maprouneifolia and S. cordatum can be used as indicator dambo species in NNR, with high likelihood of occurrenceElsevierRepositório da Universidade de LisboaMbanze, Aires AfonsoMartins, Amade MárioRivaes, RuiRibeiro-Barros, Ana I.Ribeiro, Natasha Sofia2019-08-08T12:51:11Z20192019-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.5/18219engGlobal Ecology and Conservation 20 (2019) e00704https://doi.org/10.1016/j.gecco.2019.e00704info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-03-06T14:47:50Zoai:www.repository.utl.pt:10400.5/18219Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T17:03:18.528803Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Vegetation structure and effects of human use of Dambos ecosystem in northern Mozambique
title Vegetation structure and effects of human use of Dambos ecosystem in northern Mozambique
spellingShingle Vegetation structure and effects of human use of Dambos ecosystem in northern Mozambique
Mbanze, Aires Afonso
Dambos wetland
horizontal and vertical structure
sampling-based rarefaction
species diversity
indicators species
title_short Vegetation structure and effects of human use of Dambos ecosystem in northern Mozambique
title_full Vegetation structure and effects of human use of Dambos ecosystem in northern Mozambique
title_fullStr Vegetation structure and effects of human use of Dambos ecosystem in northern Mozambique
title_full_unstemmed Vegetation structure and effects of human use of Dambos ecosystem in northern Mozambique
title_sort Vegetation structure and effects of human use of Dambos ecosystem in northern Mozambique
author Mbanze, Aires Afonso
author_facet Mbanze, Aires Afonso
Martins, Amade Mário
Rivaes, Rui
Ribeiro-Barros, Ana I.
Ribeiro, Natasha Sofia
author_role author
author2 Martins, Amade Mário
Rivaes, Rui
Ribeiro-Barros, Ana I.
Ribeiro, Natasha Sofia
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Mbanze, Aires Afonso
Martins, Amade Mário
Rivaes, Rui
Ribeiro-Barros, Ana I.
Ribeiro, Natasha Sofia
dc.subject.por.fl_str_mv Dambos wetland
horizontal and vertical structure
sampling-based rarefaction
species diversity
indicators species
topic Dambos wetland
horizontal and vertical structure
sampling-based rarefaction
species diversity
indicators species
description Original research article
publishDate 2019
dc.date.none.fl_str_mv 2019-08-08T12:51:11Z
2019
2019-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.5/18219
url http://hdl.handle.net/10400.5/18219
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Global Ecology and Conservation 20 (2019) e00704
https://doi.org/10.1016/j.gecco.2019.e00704
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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