Dissertation/Thesis Abstract

Lava roughness, aridity, and early ecosystem development across a topo-climatic gradient: The 1855–56 Mauna Loa lava flow, Hawai`i
by Rodomsky, Brett Thomas, M.S., University of Hawai'i at Hilo, 2011, 82; 1496165
Abstract (Summary)

Categorical pahoehoe and 'a'a lava substrate textures of the 1855–56 Mauna Loa lava flow were quantified as surface area and a continuous lava roughness index. Hypsometric point-intercept plots and GIS were used to derive lava roughness models across multiple spatial scales. Water-energy dynamics were quantified as an aridity index. To test the substrate control model, aridity, elevation, lava roughness, and lava texture were used as predictors of primary succession across the topo-climatic gradient. Lava roughness explains the majority of variation in localized primary succession trajectories and ∼10% of the variation across this topo-climatic gradient. The aridity index is a better predictor of ecosystem development than elevation, explaining ∼80% of landscape-scale variation. Significant interactions between aridity and lava texture suggest equilibrium transition points for ecosystem development indicators, as predicted by the substrate control model. Quantified substrate roughness and the aridity index have potential applications for explaining early primary succession trajectories worldwide.

Indexing (document details)
Advisor: Juvik, James O.
School: University of Hawai'i at Hilo
School Location: United States -- Hawaii
Source: MAI 49/06M, Masters Abstracts International
Subjects: Plant biology, Ecology, Environmental science
Publication Number: 1496165
ISBN: 9781124726908
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