Tag Archives: Abundance

Assessment of Insect Functional Groups of Mangroves Parts at Asarama, Andoni, Rivers State, Nigeria (Published)

Mangroves are intertidal plants which have parts that provide equal opportunities for insects’ habitation, yet some infect species prefer certain parts than the others and consequently occur more abundantly and feed voraciously. Investigations on the abundance of insect species associated with three types of mangroves’ parts and insect functional groups in the Asarama mangrove ecosystem, Nigeria was undertaken to unravel the level of performance of the ecosystem based on the groups available. Sweep net was used to collect insects from the leaves, and forceps from roots and stems. The samples were placed in a 70% alcohol in a vial and taken to the entomology research laboratory of the Department of Animal and Environmental Biology, University of Port Harcourt for identification using taxonomic keys and grouping into functional groups. Entomofaunal abundance on mangrove parts: leaves (47), stems (36), and root (21). Abundance was highest on parts of Rhizophora mangle and lowest on Lacunlaria racemosa. Some species occur on all plant parts, while others were restricted to a particular part. Pieris rapae occurred on the leaves of 3 mangroves, but absent on stems and roots. Eighteen, fourteen, and two insect species were not found on the roots, stems and leaves, respectively, of the three mangrove habitat-types. The Asarama mangroves contained four insect functional groups: pollinators (19), predators (32), burrowers (20) and herbivores (11). The most abundant functional group was the predator group (39.02%) and the least abundant was herbivorous group (13.4%). The result also showed high abundance of Anopheles mosquitoes and low abundance of Dragonflies. Statistically a high level of significant differences in abundance of species occurred between functional groups recorded on R. mangle and A. germinas habitat-types. There was significant difference between abundance of species collected form plant parts of R. mangle and A. germinas. The implications of these results were discussed.

Keywords: Abundance, anopheles, dragonflies, functional mangroves groups, pieris rapae, plants part

Survey of Zooplanktondiversity and Abundance and Its Relationship with Physicochemical Parameters in River Kashimbila Takum, Taraba State, Nigeria (Published)

Zooplankton diversity and abundance and its relationship with physico-chemical parameters in River Kashimbila was carried out for a period of eight (8) months from August, 2016 to March, 2017.Physico-chemical parameters were determined, the identification and abundance of zooplankton were also determined. A total of twenty one (21) species of zooplankton were reported, which was dominated by Ciliophora (34.61%), followed by Rotifera (32.92%) and the least being Cnidaria (0.02%). Shannon Weinner diversity index ranged from 1.40 -2.72, Margalef Index from 2.37 – 2.72 and evenness from 0.45 – 0.60. The data revealed that there was a significant difference among number of species and species count at (P<0.05) between raining and dry season. Zooplankton diversity and abundance were influenced by seasons and sites while species composition varied significantly with season at (P<0.05).Based on the zooplankton diversity and abundance, the rivers holds high possible impact on fish production.

Keywords: Abundance, Diversity, River Kashimbila, Zooplankton

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