Tag Archives: Species

IMPACT OF INDISCRIMINATE LANDUSES ON SPECIES ABUNDANCE:CASE STUDY OF SILK COTTON TREE CEIBA PETENDRA COLONY AT SOUTHERN SUBURB OF ZARIA CITY – NIGERIA (Published)

The case of silk cotton tree (Ceiba petendra ) that has colonized an area of more than 1,000 hectres at the southern suburb of Zaria city for almost 5 centuries’ is the subject of the study. It aims at documenting how indiscriminate human activities led to the gradual depletion of the vegetal cover. Landuse characterization, botanical and ecological parameters were focused and an alarming negative results were evident in such indices as species density, species ‘regeneration, surface cover, soil erosion and fertility status. This negative development is assiduously affecting not only the tree colony but also soil quality, crop yield and the water table of the entire city. Consequently, a re-reservation and the re-plantation of the colony was proposed as a panacea to the ever increasing deterioration of the fragile ecosystem

Keywords: Ecology, Flora, Silk-Cotton, Species, Zaria, land use

The Relative Abundance of Floraspecies in the Tropical Rainforest Ecosystem of Boki Nigeria (Published)

This study was conducted with the view to analysing flora species abundance in the tropical rainforest ecosystem of Boki. Despite the spate of indiscriminate logging, this area still remains one of the few ecosystems that have been highly valued for its species diversity. Two forest formations the protected and the unprotected forest were used for the analysis. Six forest enclaves – Kanyang, Borum, Isobendeghe, Okwa I, Okwa II and Okwango were chosen for the study. Transects were laid from the centre of each forest enclave to the heart of the forest. Actual measurement of the quadrat started at a distance of 2km away from each enclave. A quadrat of 100m by 100m was demarcated for flora species identification and enumeration. The relative abundance was computed using the frequency of each species as percentage of the total species in the quadrat. The mean (x-) proportional abundance was computed to determine levels of flora species abundance. This was also complemented with the lognormal curve. Here, the number of flora species was plotted against individual species. The girth of each flora species was determined at breast height of 1.5m. The result of the analysis revealed that very few flora species were of low and high abundance whereas majority were in moderate abundance. Also majority of the trees in the area were in the category of 6-10 metre girth at breast height in the protected forest and 0-5 metre girth at breast height in the unprotected forest.

Keywords: Abundance, Ecosystem, Forest, Frequency, Species