January 2011
Urban expansion and vegetal cover loss in and around Nigeria’s Federal Capital City
Since Abuja became Nigeria’s Federal Capital Territory in 1976; it has been experiencing rapid expansion, urbanization and significant changes in its physical landscape. This study used Remote sensing and GIS techniques to identify, mark and measure the extent of change in the various land uses from the Landsat imageries of 1987 and 2001, and Nigeriasat-1 imagery of 2006. The study...
January 2011
Impact of Lantana camara L. invasion on riparian vegetation of Nayar region in Garhwal Himalayas (Uttarakhand, India)
Lantana camara L. (Verbenaceae), an exotic from tropical America, has invaded vast areas of forests surrounding Nayar River in Garhwal Himalayas (Uttarakhand, India). Several factors like high reproductive potential, absence of preferred predators, evergreen nature and sufficient moisture provided by river water favour extraordinary growth of L. camara in this area. In this study, the impact of L....
January 2011
Insecticidal action of hexane extracts of three plants against bean weevil, Callosobruchus maculatus (F.) and maize weevil, Sitophilus zeamais motsch
A study was conducted to evaluate the insecticidal action of hexane extracts of three locally available plants namely: Lantana camara (Verbenaceae), African nutmeg [Monodora myristica (Gaerth) Dunal] and Enuopiri [Euphorbia lateriflora, Schum and Thonner] against bean weevil Callosobruchus maculatus (F.) and maize weevil,Sitophilus zeamais) Motsch with response to the...
January 2011
Soil micro-arthropods in a secondary rainforest, Rivers State, Nigeria: Ecosystem health indicators of oil pollution
Comparisons were made of the species richness and densities of soil micro-arthropods- (mites, collembolans) from a relatively undisturbed secondary forest and a nearby area, where there had been an oil spill, approximately 1 year before the commencement of the 2 year study, May, 2007 to April, 2009. Soil samples were taken monthly with an 8.5 cm diameter bucket-type auger. Extraction was by the Berlese-Tullgren funnel....
