L’élevage de ruminants en Afrique l’Ouest repose principalement sur des ressources naturelles composées majoritairement végétation spontanée. Cet élevage pastoral se déroule zones savanes alliant à la fois communautés herbacées et ligneuses. L’alimentation du cheptel est fournie pour l’essentiel par le pâturage naturel d’herbacées annuelles complété celui aérien ligneux. Cette dépend précipitat...

This research investigates temporal and spatial patterns of vegetation greenness and explores relationships between rainfall and vegetation dynamics in the Sahel, based on analyses of NDVI time series and gridded precipitation estimates at different spatial resolutions.

Sahel bölgesi, son on yıl içerisinde hem siyasi de ekonomik açıdan güvenlik sorununun belirginleştiği önemli bölgelerden birisi haline gelmiştir. bir yandan bölgesel ve bölge dışı güçlerin politikalarını etkileyen, diğer bu devletlerin terörizmle mücadele girişimlerini belirleyen coğrafya olarak ön plana çıkmıştır. Buna çalışmada, bölgesinde yaşanan terör saldırılarının nedenleri incelenmiş sal...

uniparametric, non-parametric methods and ammi model (additive main effects and multiplicative interaction) were used to evaluate the yield stability of ten cotton cultivars at six regions of golestan and mazandaran provinces (baye kola, gharakheil, kalaleh, khan bebein, karkandeh, hashem abad) during two successive years ( 2005 & 2006). the experiment was conducted in randomized complete block...

* Corresponding author. Abstract – The semi-arid Sahel zone of Africa has suffered several periods of severe drought since about 1950. We have analyzed AVHRR Normalized Difference Vegetation Index (NDVI) over the Sahel for the period 1982-2002, and found extensive areas of increasing NDVI. To verify these changes we have analyzed Landsat TM and ETM+ scenes from 1984-1986 and 1999-2001 for areas...

The study of pathological conditions of the male reproductive system is paramount to understanding reproductive inefficiency in the Sahel goat. In this study, 1048 Sahel bucks presented for slaughter at the Maiduguri metropolitan abattoir were evaluated for the presence of various pathological abnormalities of the reproductive system. A total incidence of 15.08% was recorded for various patholo...

15 Numerical and theoretical studies have shown that mesoscale gradients in land surface properties can induce circulations in the atmosphere. This study provides the first well-resolved observations of such flows induced by soil moisture from recent rainfall, and is based on aircraft data in the Sahel. Satellite imagery was used to identify fine scale soil moisture features within a wet zone s...

This article examines how the European Union (EU) Strategy for security and development in the Sahel has been used as a ‘laboratory of experimentation’ for the implementation of the Comprehensive Approach. In this context, it looks at how power struggles at the discursive and praxis levels are performing the international agency of the EU. These struggles are played out by EU officials based in...