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Hiroaki Ishiga

Publications (3)

Holocene Lacustrine Environment in the Western Eritrea-evidence from Freshwater Shells

Wegahta Tesfalidet Berhe & Hiroaki Ishiga · Journal of Geography, Environment and Earth Science International · 2019

This study focused on finding of freshwater molluscs in Holocene sediments outcropping in western Eritrea. Three species of gastropods were found in calcareous sediments at the bank of a tributary river named Shatera River, within the license of Bisha Mines, they are Melanoides t...

Open access Research Article 10.9734/jgeesi/2019/v21i330126

Heavy Metal Concentrations in Mangrove Sediments and R. racemosa in Niger Delta, Nigeria

Nnawugwu Nwawuike & Hiroaki Ishiga · Journal of Geography, Environment and Earth Science International · 2018

This study assessed the concentration of As, Pb, Zn, Cu, Ni, Cr, V, Sr, Y, Nb, Zr, Cl, TS, TiO2, MnO, CaO and P2O5 in the mangrove sediment and R. racemosa samples from Choba, Ogbogoro and Isaka in Niger Delta, Nigeria. A total of 6 sediment and 9 R. racemosa samples were collect...

Open access Research Article 10.9734/JGEESI/2018/44485

Elemental Composition of Core Sediments in Niger Delta Mangrove, Nigeria

Nnawugwu Nwawuike & Hiroaki Ishiga · Journal of Geography, Environment and Earth Science International · 2018

Mangrove core sediments from Choba, Ogbogoro and Isaka in Niger Delta, Nigeria were analyzed to determine their geochemical composition. The ecological risk of the metal concentrations was assessed using Contamination Factor (CF) and Enrichment Factor (EF) while the quality of th...

Open access Research Article 10.9734/JGEESI/2018/42913