Graduate Thesis Or Dissertation
 

Lamprey of the Goose Lake Basin: A Multi-Scale Habitat & Distribution Analysis

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/7m01bv62h

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  • Two ecologically important lamprey species found in the endorheic Goose Lake Basin face conservation threats; however, relatively little is known about their habitat needs or spatial distribution. Lamprey and their habitat are often found to be patchy; to evaluate these relationships for the lamprey in this basin, I utilized a variety of approaches at differing scales. To relate lamprey presence to smaller reach scales, I utilized traditional electrofishing and stream habitat sampling, along with a novel ecosystem functioning metric collected in the summer of 2023. To relate lamprey presence to larger channel and network scales, and to predict their distribution, I utilized preexisting fish datasets collected between 2007-2022, modeled flow, and GIS-derived geomorphic variables at differing scales within a statistical stream network modeling approach. I found that traditional methods were relatively ineffective for evaluating lamprey-habitat associations and that higher ecological breakdown rates are not directly associated with lamprey presence, although a limited sample size makes drawing strong conclusions challenging. I also found that lamprey presence in this basin was best predicted by low slope and high sinuosity at one-kilometer scales, high modeled flow, and high area-weighted elevation. Lamprey are challenging to study; however, their unique relationship with the landscape and riverscape enables an opportunity to use geomorphological and flow characteristics along with spatial relationships to predict their distribution.
  • Keywords: Lamprey Habitat, Species Distribution Model, Geomorphology, Ecological Breakdown Rate, Spatial Stream Network Model
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  • 18020001
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