January 2008

Exploration and Environmental Exploitation (1908 – 2008)

Author(s): Prof. Oladele A. Ogunseitan

January 2008

On the matched pairs sign test using bivariate ranked set sampling: an application to environmental issues

  The matched pairs sign test using bivariate ranked set sampling (BVRSS) is introduced and investigated. We show that this test is asymptotically more efficient than its counterpart sign test based on a bivariate simple random sample (BVSRS). The asymptotic null distribution and the efficiency of the test are derived. The Pitman asymptotic relative efficiency is used to compare the asymptotic performance of...

Author(s): Hani M. Samawi, Mohammad F. Al-Saleh and Obaid Al-Saidy

January 2008

Traditional strategies used by pastoralists to cope with la nina induced drought in Kajiado, Kenya

  Pastoralists traditionally relied on herd mobility to cope with drought. In the pastoral areas of Kajiado, Kenya this strategy is now threatened by increased individual land ownership as compared to communal access.  Drought frequency as related to El-Nino and Southern Oscillation (ENSO) is predicated to increase with climate change. The aim of the study was investigate the use of herd mobility strategy...

Author(s):   Mworia, J. K.  and J. I. Kinyamario

January 2008

Growth characteristics of two tropical forest species Warburgia ugandensis and Polyscias fulva seedlings grown under contrasting light conditions

  Growth parameters for seedlings of two forest trees, Warburgia ugandensis andPolyscias fulva, were measured under various light growth conditions. Leaf area and plant height were significantly higher under low light (< 42% full sunlight) than high light (65% of sunlight) growth conditions (P<0.001). Plant leaf area ranged from 238 cm² under full sunlight to 376 cm² under dense...

Author(s): J. I. Kinyamario, T. P. Wang’ombe, J. Wanyondu