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An Examination Of Water Consumption During And After Severe Drought In Coastal Stands Of Douglas-Fir In The Pacific Northwest, Kirsten Reddy

Cal Poly Humboldt theses and projects

The Pacific Northwest region is predicted to encounter rising temperatures over the next century, ultimately leading to less water storage during seasonal drought periods. Vast coniferous forests dependent upon this storage and will encounter periods of increased stress due to the lessening of available water supply. Under these conditions, stream flows will be directly affected by the forests competing for freshwater sources. Thinning treatments have been investigated as a means to compensate for increased water use by even-aged forest stands left over from past logging-practices.

This study was completed on two sites within Humboldt County, CA: one inland site with …

A Comparison Of Benthic Macroinvertebrate Assemblages Between Perennial And Intermittent Headwater Streams Of The Mattole River In Northern California, Usa, Mason S. London

Cal Poly Humboldt theses and projects

Intermittent streams are common throughout the world and comprise 60% or more of total river lengths in the conterminous United States. Despite their prevalence, intermittent streams are understudied, particularly first-order headwater streams, which are vital for maintaining the function, health and biotic diversity of river networks. In June 2016, I sampled five intermittent and five perennial headwater streams in the Mattole River watershed in northwestern coastal California, USA, to compare benthic macroinvertebrate (BMI) assemblages between intermittent and perennial streams. BMI samples were collected using a 500µm mesh D-net at eight randomly located riffles along a 150-m reach, and then composited, …