Archidium acanthophylum (Moss) and Cyanotis lanata (Succulent monocot) Succession model: Inselberg Indicators in Southwestern Nigeria
By Oyesiku Olubukunola Oluwole and Amusa N Adetunji
Succession progression on an Inselberg, an insular rock with its peculiar microclimate, and vegetation was monitored quarterly for three years. Lichen (Buellia canescens), moss (Achidium acanthophyllum), and succulent monocot (Cyanotis lanata) formed major vegetation on the rock, and the three plants were zero in for study. Quadrat method was use to measure the density of the target plants. Operational succession models accessed. Density cover of B. canescens remained constant throughout the year, while C. lanata and A. acanthophyllum coexist. C. lanata density increased and A. acanthophyllum decreased from March to September, while the A. acanthophyllum and C. lanata decreased from September to December. Measure of pH value of the substrate on the rock in December was significantly higher than any other month (7.3 ± SE 0.12, p < 0.05). Temperature of the substrate increased significantly (39.6 o C ± SE 0.56, p < 0.05) in December. Relative humidity above vegetation on rock surface increased significantly (78.78 ±SE 0.90, p = 0.05) in June and September. B. canescens exhibited inhibition model of succession while the coexisting C. lanata and A. acanthophyllum exhibited facilitation model. Tolerance model was not visible among the rock vegetation. Inselberg was established as indicator of C. lanata and A. acanthophyllum.
Keywords: Archidium acanthophyllum, Cyanotis lanata, facilitation model, indicator, inhibition model, inselberg, succession.
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