Some biological characteristics that foster the invasion of Prosopis juliflora (Sw.) DC. at Middle Awash Rift Valley Area, north-eastern Ethiopia

Shiferaw, Hailu; Teketay, Demel; Nemomissa, Sileshi; Assefa, Fassil

doi:10.1016/j.jaridenv.2003.08.011

Cited by 158 publications

(132 citation statements)

References 23 publications

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“…Both species produce palatable pods [10] which are eaten by many domesticated and wild animals. This enhances seed germination after passing through the digestive system [3] and further propagates the species [18]. A fully developed Prosopis tree yields between 10 and 50 kg of pods annually [19], with approximately 20 to 35 thousand seeds per kg [20].…”

Section: Initial Locationmentioning

confidence: 99%

“…The soils are moderately to poorly drained, very deep, strongly calcareous, saline and sodic in some areas [3]. The texture is fine sandy loam to clay.…”

Section: Study Areamentioning

confidence: 99%

“…Globally, they are regarded as noxious invaders having substantial impacts on biodiversity, ecosystem services, as well as on local and regional economies in their native and even more so in their invasive ranges [2]. According to Shackleton et al [2] factors that make many Prosopis species successful invaders are: (a) the production of a large number of seeds that remain viable for decades; (b) rapid growth rates; (c) the ability to coppice after damage [3][4][5]; (d) a root system that taps deep into the groundwater table [6,7]; (e) a high tolerance to climate extremes; (f) a high tolerance to various soil types; and (g) negative allelopathic effects on competing plants [8].…”

Section: Introductionmentioning

confidence: 99%

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Assessing the Potential of Sentinel-2 and Pléiades Data for the Detection of Prosopis and Vachellia spp. in Kenya

Rima

Einzmann

et al. 2017

Remote Sensing

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Abstract:Prosopis was introduced to Baringo, Kenya in the early 1980s for provision of fuelwood and for controlling desertification through the Fuelwood Afforestation Extension Project (FAEP). Since then, Prosopis has hybridized and spread throughout the region. Prosopis has negative ecological impacts on biodiversity and socio-economic effects on livelihoods. Vachellia tortilis, on the other hand, is the dominant indigenous tree species in Baringo and is an important natural resource, mostly preferred for wood, fodder and charcoal production. High utilization due to anthropogenic pressure is affecting the Vachellia populations, whereas the well adapted Prosopis-competing for nutrients and water-has the potential to replace the native Vachellia vegetation. It is vital that both species are mapped in detail to inform stakeholders and for designing management strategies for controlling the Prosopis invasion. For the Baringo area, few remote sensing studies have been carried out. We propose a detailed and robust object-based Random Forest (RF) classification on high spatial resolution Sentinel-2 (ten meter) and Pléiades (two meter) data to detect Prosopis and Vachellia spp. for Marigat sub-county, Baringo, Kenya. In situ reference data were collected to train a RF classifier. Classification results were validated by comparing the outputs to independent reference data of test sites from the "Woody Weeds" project and the Out-Of-Bag (OOB) confusion matrix generated in RF. Our results indicate that both datasets are suitable for object-based Prosopis and Vachellia classification. Higher accuracies were obtained by using the higher spatial resolution Pléiades data (OOB accuracy 0.83 and independent reference accuracy 0.87-0.91) compared to the Sentinel-2 data (OOB accuracy 0.79 and independent reference accuracy 0.80-0.96). We conclude that it is possible to separate Prosopis and Vachellia with good accuracy using the Random Forest classifier. Given the cost of Pléiades, the free of charge Sentinel-2 data provide a viable alternative as the increased spectral resolution compensates for the lack of spatial resolution. With global revisit times of five days from next year onwards, Sentinel-2 based classifications can probably be further improved by using temporal information in addition to the spectral signatures.

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Section: Initial Locationmentioning

confidence: 99%

“…The soils are moderately to poorly drained, very deep, strongly calcareous, saline and sodic in some areas [3]. The texture is fine sandy loam to clay.…”

Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessing the Potential of Sentinel-2 and Pléiades Data for the Detection of Prosopis and Vachellia spp. in Kenya

Rima

Einzmann

et al. 2017

Remote Sensing

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“…The genus Prosopis L. is characteristic of arid and semiarid zones, and its widespread distribution includes ecosystems in Asia, Africa, and the Americas (Pérez-García et al, 2012). The species of this genus are characterized by high individual genetic variability at the population level, which influences the responsiveness of these species to extrinsic variables, such as climate, drought, alkalinity and salinity (Shiferaw et al, 2004). In Mexico, the majority of the populations of the genus Prosopis are found in the northern and central of the country, where they have formed forest extensions that are adapted to desert climate.…”

Section: Bioacumulación Y Cambios En Aparato Fotosintético De Prosopimentioning

confidence: 99%

Bioaccumulation and changes in the photosynthetic apparatus of Prosopis juliflora exposed to copper

et al. 2016

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The effect of copper toxicity on the photosynthetic activities and bioaccumulation in different tissues of Prosopis juliflora was investigated using three CuSO 4 concentrations (10, 50 and 100 mM) added under hydroponic conditions. Copper concentration and chlorophyll fluorescence were measured after 48 h of copper stress. The results obtained in this study show that increasing levels of 50 and 100 mM Cu 2+ resulted in a significant accumulation of this metal mainly in roots compared with control roots. On the other hand, our result showed a significant reduction of maximum photochemical efficiency of photosystem II (Fv/Fm) and the activity of photosystem II (F v /F 0 ) ratios in P. juliflora leaf treated with 100 mM Cu 2+ with respect to control after 4h of exposure. These changes suggested that the photosynthetic apparatus of P. juliflora was the primary target of the Cu 2+ action. Therefore the information provided by this short-term (48 h) experiment in P. juliflora showed that several physiological processes are activated, in which the copper uptake by roots and their accumulation in tissues play a central role. In conclusion, the chlorophyll fluorescence parameters can be used as a useful physiological tool to assess early changes in photosynthetic performance of P. juliflora in response to copper pollution in short-term. Finally, the present study showed that P. juliflora is a promising prospect for heavy metals phytoremediation purposes occurring in arid and semi-arid climates in the northwest Mexico.

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“…(Algaroba), cujo potencial invasivo no bioma já foi ressaltado recentemente por Pegado et al (2006) e por Andrade et al (2008). Trabalhos recentes, a exemplo de Elfadl e Luukkanen (2004), realizados no oeste do Sudão, de Shiferaw et al (2004), no nordeste da Etiópia, e de Pegado et al (2006) e Andrade et al (2008), no nordeste do Brasil, mostram que P. julifl ora causa sérios problemas em locais diferentes do seu habitat natural, pois, de acordo com esses autores, a sua capacidade de reprodução e regeneração a torna extremamente agressiva, particularmente se associada a alguns facilitadores, como os dispersores e, principalmete, a ação antrópica.…”

Section: Introductionunclassified

Invasão biológica por Prosopis juliflora (Sw.) DC.: impactos sobre a diversidade e a estrutura do componente arbustivo-arbóreo da caatinga no Estado do Rio Grande do Norte, Brasil

2009

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Este trabalho teve como objetivos estudar os impactos causados pela invasão da algaroba - Prosopis juliflora (Sw.) DC. sobre a fitodiversidade e a estrutura do componente arbustivo arbóreo da caatinga. Foram selecionadas áreas em dois municípios no Rio Grande do Norte, Brasil, (Área I e Área II), sendo que em cada município foi estudado um remanescente de caatinga sem a presença de P. juliflora (Ambiente 1) e uma área invadida pela referida espécie (Ambiente 2). Em cada ambiente, foram plotadas 10 parcelas, nas quais foram amostrados todos os indivíduos arbóreo-arbustivos, incluídos nas categorias de adultos e regenerantes. A diversidade, medida pela função de Shannon-Wiener, para o Ambiente 1, nas Áreas I e II, alcançou, respectivamente, os seguintes valores: 2,74 e 2,44 para os adultos; 1,96 e 1,83 para os regenerantes; enquanto que, para o Ambiente 2, esses valores foram de apenas 0,88 e 0,42 para os adultos; 0,16 e 0,79 para os regenerantes, correspondendo às Áreas I e II, respectivamente. Os resultados demonstraram que P. juliflora afeta drasticamente a diversidade e, por conseguinte, a estrutura das comunidades invadidas, tornando evidente a necessidade de controle da referida invasora que ora ameaça a biodiversidade autóctone da caatinga e ecossistemas associados.

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Some biological characteristics that foster the invasion of Prosopis juliflora (Sw.) DC. at Middle Awash Rift Valley Area, north-eastern Ethiopia

Cited by 158 publications

References 23 publications

Assessing the Potential of Sentinel-2 and Pléiades Data for the Detection of Prosopis and Vachellia spp. in Kenya

Assessing the Potential of Sentinel-2 and Pléiades Data for the Detection of Prosopis and Vachellia spp. in Kenya

Bioaccumulation and changes in the photosynthetic apparatus of Prosopis juliflora exposed to copper

Invasão biológica por Prosopis juliflora (Sw.) DC.: impactos sobre a diversidade e a estrutura do componente arbustivo-arbóreo da caatinga no Estado do Rio Grande do Norte, Brasil

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