Browsing by Author "Rumisha, C."
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Item Benthic macroinvertebrate assemblages in mangroves and open intertidal areas on the Dar es Salaam coast, Tanzania(NISC (Pty) Ltd and Taylor & Francis, 2015) Rumisha, C.; Shukuru, H.; Lyimo, J.; Maganira, Justine Daudi; Nehemia, A.The assemblages of benthic macroinvertebrates in mangroves and open intertidal areas of the Dar es Salaam coast, Tanzania, was investigated in 2013–2014, revealing 56 species. Higher density, species richness and diversity were recorded in open intertidal areas, compared to nearby mangrove forests. Non-metric multidimensional scaling indicated differences in assemblages between mangrove and open intertidal samples. These differences were confirmed by analysis of similarity. SIMPER identified an average dissimilarity of 97.24% between mangroves and open intertidal samples, most of which were due to the malacostracan Uca annulipes and the gastropod Cerithidea decollata. PRIMER RELATE indicated significant correlation between macroinvertebrate assemblages and the measured physico-chemical parameters salinity, pH, redox potential and sediment particle size, whereas BIOENV and the Monte Carlo permutation test indicated that redox potential, sediment particle size and pH contributed significantly to variation in species composition. Mangroves were dominated by the gastropod C. decollata, and by the malacostracans Neosarmatium africanum and U. annulipes, and open intertidal areas by the bivalves Dosinia hepatica and Eumarcia paupercula. Due to the rich biodiversity in open intertidal ecosystems, it is recommended that conservation efforts along the Tanzanian coast should focus here.Item Impact of habitat degradation on the assemblage of riparian ground beetles (Coleoptera: Carabidae) in the Morogoro Municipality, Tanzania(Sokoine University of Agriculture, 2019) Crodward, N.; Nehemia, A; Rumisha, C.; Maganira, J. D.This study assessed the impact of habitat degradation on the assemblage of riparian ground beetles in the Morogoro Municipality, Tanzania. The beetles were collected from three degraded (Ngerengere, Morogoro and Kikundi) and three relatively pristine streams (Bigwa, Vituli and Lukuyu) during the rainy season between January and April 2013. The beetles were collected by active searching on the ground, in leaf litters, under logs and stones. The abundance, species richness and diversity of the beetles were analyzed using Diversity and Richness ver. 2.65, PRIMER ver. 6.1 and SYSTAT ver. 10. The abundance of beetles was significantly high in relatively pristine streams (n=143) compared to the degraded streams (n=75; 34.4%) (Mann-Whitney U=4396.500; p<0.05). Metagonum sp.2, Peryphus sp.3, Boeomimetes ephippium, Abacetus sp.2 were the most abundant in relatively pristine streams while Diatypus uluguruanus, Metagonum mboko, Peryphus sp.3 were the most abundant in degraded streams. The highest species richness (S=21) was recorded in relatively pristine streams (s=21) while the lowest species richness (S=13) was recorded in the degraded streams. Furthermore, relatively pristine streams showed the highest average diversity (H′ = 2.5359) compared to the degraded streams (H′ = 2.0662). Based on the findings, ground beetles are good indicators of habitat quality. These results call for strengthened measures to control degradation of the riparian areas in the Morogoro municipality.