Maps showing geology, oil and gas fields and geological provinces of Africa

Persits, Feliks M.; Ahlbrandt, Thomas S.; Tuttle, Michele L.; Charpentier, Ronald R.; Brownfield, Michael E.; Takahashi, Kenneth I.

doi:10.3133/ofr97470a

Cited by 55 publications

(38 citation statements)

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“…According to the geological maps of Chad (Wolff, 1964;Persits et al, 1997), the Faya basin formed in sandstones of most likely Late Devonian age (Fig. 2) that build up the large Borkou plateau.…”

Section: The Faya Basin -Geological Settingmentioning

confidence: 99%

Short note: The Faya basin (N Chad, Africa) – A possible impact structure?

Schmieder

Buchner

2007

Journal of African Earth Sciences

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Section: The Faya Basin -Geological Settingmentioning

confidence: 99%

Short note: The Faya basin (N Chad, Africa) – A possible impact structure?

Schmieder

Buchner

2007

Journal of African Earth Sciences

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“…Additionally, a categorical normalized difference vegetation index (NDVI) and superficial geology were obtained from BEUKEMA et al (2010) and downloaded from PERSITS et al (1997), respectively. Collinearity of the variables was measured with Pearson's correlation coefficient in ENMtools 1.3.…”

Section: Ecological Niche Modellingmentioning

confidence: 99%

Distribution review, habitat suitability and conservation of the endangered and endemic Moroccan spadefoot toad (Pelobates varaldii)

Pous

Beukema²,

Dingemans³

et al. 2012

Basic Appl Herpetol

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The Moroccan spadefoot toad (Pelobates varaldii) has received little scientific attention since its discovery. Currently, P. varaldii is listed as Endangered on the IUCN Red List due to a multitude of threats, while its distribution is partially unknown and fragmented. The current study addresses distribution, threats and the potential niche using ecological niche modelling, while emphasizing conservation strategies and immediate actions. The distribution of P. varaldii can be divided into four disjunct areas, at least two of which consist of small populations. The largest threats to P. varaldii include the transformation of habitat and breeding ponds into agricultural and industrial areas, the pollution of breeding ponds due to extensive livestock pasturing and the possible expansion of Procambarus sp. into the Mamora cork oak forest. Additional threats constitute a reduction of gene flow and loss of genetic variability as a result of habitat fragmentation. The ecological niche models (ENMs) of P. varaldii revealed fundamental environmental conditions along parts of the northeast Moroccan Atlantic and Mediterranean coastline. The species mainly inhabits well vegetated areas upon Quaternary soils at low altitudes. Proposed conservation actions include the development of a biannual monitoring program, identification and designation of protected areas within the distribution and development of a management plan for Mamora forest. K Key words: Anura; conservation; habitat suitability; Maxent; Morocco; NDVI.Revisión de la distribución, idoneidad del hábitat y conservación del amenazado endemismo sapo de espuelas marroquí (Pelobates varaldii). Desde su descubrimiento, el sapo de espuelas marroquí (Pelobates varaldii) ha recibido poca atención por parte de la comunidad científica. Como consecuencia de multitud de amenazas, P. varaldii está actualmente catalogado como En Peligro de Extinción en la lista roja de la UICN, siendo su distribución muy fragmentada y no completamente conocida. El presente estudio analiza su distribución, amenazas y nicho potencial utilizando el modelado de nicho ecológico al tiempo que se enfatiza en posibles estrategias de conservación y acciones inmediatas. La distribución de P. varaldii puede dividirse en cuatro áreas disyuntas, al menos dos de las cuales corresponden a poblaciones de pequeño tamaño. Las mayores amenazas para P. varaldii incluyen la transformación de su hábitat y medios de reproducción en áreas agrícolas e industriales, la contaminación de sus charcas de reproducción como consecuencia de la ganadería extensiva y la posible expansión de Procambarus sp. hacia el alcornocal de Mamora. La reducción del flujo genético y pér-dida de variabilidad genética como consecuencia de la fragmentación del hábitat constituyen amenazas adi-

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“…A simplified hydrogeological map is shown in Figure 1 based on a synthesis of studies (Foster 1984;Guiraud 1988;UNTCD 1988;UNTCD 1989;MacDonald & Davies 2000) and using the 1:5,000,000 scale geological map of Africa as a base (UNESCO, 1991;Persits et al, 1997). The classifications reflect the different manner in which groundwater occurs, constrained by the geological information available at this scale throughout SSA.…”

Section: Produced From Data From New and Hulme (1997)mentioning

confidence: 99%

African hydrogeology and rural water supply

MacDonald¹,

Davies²,

Calow³

2008

IAH - Selected Papers on Hydrogeology

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The widespread development of groundwater is the only affordable and sustainable way of improving access to clean water and meeting the Millennium Development Goals for water supply by 2015. Current approaches to rural water supply, in particular demand driven approaches and decentralisation of service delivery have many benefits to the overall efficacy and sustainability of water supplies, however, problems arise when projects do not take into

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Maps showing geology, oil and gas fields and geological provinces of Africa

Cited by 55 publications

References 0 publications

Short note: The Faya basin (N Chad, Africa) – A possible impact structure?

Short note: The Faya basin (N Chad, Africa) – A possible impact structure?

Distribution review, habitat suitability and conservation of the endangered and endemic Moroccan spadefoot toad (Pelobates varaldii)

African hydrogeology and rural water supply

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