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Jacobson, P.J. 1997. An Ephemeral Perspective of Fluvial Ecosystems: Viewing Ephemeral Rivers in the Context of Current Lotic Ecology. Dissertation submitted to the Faculty of the Virginia Polytechnic Institute and State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Biology


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An Ephemeral Perspective of Fluvial Ecosystems: Viewing Ephemeral Rivers in the Context of Current Lotic Ecology.

Summary / Notes:

Hydrologic and material dynamics of ephemeral rivers were investigated in the Namib Desert to assess how hydrologic regimes shape the physical habitat template of these river ecosystems. An analysis of long-term hydrologic records revealed that the variation in mean annual runoff and peak discharge were nearly four times higher than the global average, rendering the rivers among the most variable fluvial systems yet described. Further, a pronounced downstream hydrologic decay characterized all of the rivers. The high spatio-temporal variability in flow was reflected in patterns of material transport. Retention of woody debris increased downstream, in contrast to patterns typically reported from more mesic systems, largely attributable to hydrologic decay. Woody debris piles were the principal retentive obstacles and played an important role in channelrndynamics. Key Words: hydrology, flooding, organic matter dynamics, Namib Desert.

Year: 1997

Type: Thesis

Download: Jacobson Thesis 1997_Ephemeral Rivers.pdf (304 kb)

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