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Influence of Geomorphology and Land Use on Distribution and Abundance of Salmonids in a Coastal Oregon Basin

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Influence of Geomorphology and Land Use on Distribution and Abundance of Salmonids in a Coastal Oregon Basin AN ABSTRACT OF THE THESIS OF John Steven Schwartz for the degree of Master of Science in Fisheries Science presented on November 20. 1990. Title:Influence of Geomorpholoay and Land Use on Distribution and Abundance of Salmonids in a Coastal Oregon Basin Abstract approved:Redacted for privacy %t\InleyV. Gregor The basin morphology of a fifth-order coastal Oregon stream was analyzed across a hierarchy of spatial scales which included segments, reaches, and channel units. These scales represent valley and channel characteristics based on functional processes of geomorphology and attempt to organize heterogeneity of stream habitat within a drainage network. Four segments were associated with major geologic influences on the landscape, and boundaries were selected by basin patterns of the valley corridor observed by indices of valley floor width. Segments provided a template for reach characteristics. Narrow valley segments had greater reach lengths of multiple channels, and densities of boulders than wide valley segments. Within wide valleys of alluvium, incision of the channel occurred in three reaches and had reduced multiple channel lengths and bedforms composed of bedrock. Reach boundaries were selected by major shifts in active channel width and condition of geomorphic surfaces along basin longitudinal profiles, and these boundaries coincided with changes in bedform gradient. Reach composition of channel unit types was associated with gradient; percent length of pools and glides was inversely related to gradient. Basin patterns of salmonid distribution and abundance were examined at the different hierarchical scales. Juvenile chinook and coho salmon exhibited strong basin gradients of abundance within a upstream-downstream continuum. Juvenile chinook dominate the lower basin and juvenile coho dominate the upper basin, and the transition in abundances occurred between the two mid basin segments. From a basin perspective of reaches, salmonid abundances were not related to any specific valley landform. Abundances of trout (ages 0+ and 1 +) were directly related to mainstem reach gradient. Trout occupied fast-water channel units among the mainstem reaches, while juvenile salmon were more variable in use of channel unit types. Salmonid densities per channel unit were 2 to 8 times greater in the tributary reaches than the mainstem reaches. In the tributaries, pools and glides were used extensively for habitat. Salmonid abundances in the tributaries were associated with stream size and gradient. Densities of juvenile coho were greater in low-gradient tributaries, and densities of cutthroat trout (age 1 +) and trout fry (age 0+) were greater in high-gradient and larger tributaries. Juvenile coho occupied streams with gradients less than 4%. In the tributaries, composition of channel unit types was important because salmonids used mostly pools and glide habitats, and percent length of pools and glides was associated with stream gradient. Timber harvest in first- to third-order tributaries detrimentally affected cutthroat trout, where areal densities of trout were significantly lower in clearcut sites without buffers than in patch-cut sites with buffers and unharvested sites. Analysis of land-use effects on salmonid populations accounted for site differences in geomorphology. Tributaries contained both allopatric cutthroat trout populations and cutthroat trout populations sympatric with juvenile coho salmon. Sympatric sites exhibited greater significant differences in trout densities among land-use treatments than all sites combined, and allopatric sites were not different among treatments. CWD volumes significantly were lower in clearcut sites (1.6 m3/100 m2) than unharvested sites (2.9 m3/100 m2). Reexamining the Alsea Watershed Study (AWS) streams 23 years after logging demonstrated that detrimental effects were long term. In Needle Branch (the AWS clearcut watershed), older age classes of trout were substantially reduced in numbers after logging. Competitive interactions between juvenile coho salmon and cutthroat trout with a loss of CWD cover may contribute to the long- term decline in cutthroat trout abundance after logging. Influence of Geomorphology and Land Use on Distribution and Abundance of Salmonids in a Coastal Oregon Basin by John Steven Schwartz A THESIS submitted to Oregon State University in partial fulfillment of the requirements for the degree of Master of Science Completed November 20, 1990 Commencement June 1991 APPROVED: Redacted for privacy Associate ProfessorfFisheries in charge majc(r, Redacted for privacy Head of Department of Fisheries and Wildlife Redacted for privacy Dean of G a te School Date thesis is presented November 20, 1990 Typed by researcher for John Steven Schwartz ACKNOWLEDGEMENTS I would like to thank my major professor Dr. Stan Gregory for his guidance and many hours of work he contributed during all stages of this project. Thanks are due to Dr. Bob Beschta, Dr. James Hall, and Dr. David Hann for serving on my graduate committee. Dr. Bob Beschta provided much energy during the initial stages of the project design and can't be thanked enough for getting the "ball rolling". Dr. James Hall furnished me with many references, his office was more reliable than Kerr Library. For preparation of Chapter II,I appreciate suggestions from Dr. Gordie Reeves and Dr. James Hall (who reviewed an early version of the manuscript), and Dr. Gordon Grant and Dr. Fred Swanson. Funding was provided by Coastal Oregon Productivity Enhancement (COPE) project. Basin surveys were done with the aid of the U.S. Forest Service, PNW Forest Research Laboratory, Anadromous Fish Group (USFS), OSU Stream Team, and Adaptive COPE in Newport, Oregon. A project of this size could not have been accomplished without the help of many people.I would like to give my thanks to a few: Dr. Gordie Reeves (USFS), Dave Price (USFS), Randy Wildman (OSU), Linda Ashkenas (OSU), and Dr. Tom McMahon (COPE); special thanks must be given to Kelly Burnett (USFS) for an exceptional job of organizing field crews and managing data. During the first summer of tributary field surveys, Curt Veldhuisen and I worked together, at times through difficult terrain (crawling through 10-year-old Douglas-fir plantations to get to the stream). Many thanks to Curt who blazed the trail. Finally, I would like to thank Vicki Ursitti, my friend, my companion, for her encouragement and confidence in me, that yes someday I would finish. TABLE OF CONTENTS Page CHAPTER I: GENERAL INTRODUCTION 1 Study Area 3 General Basin Distribution of Salmonids 6 CHAPTER II: GEOMORPHOLOGY OF THE DRIFT CREEK BASIN, AND DISTRIBUTION AND ABUNDANCE OF SALMONIDS: A BASIN PERSPECTIVE INTRODUCTION 8 METHODS 17 Geomorphic Analysis 19 Segments 19 Reaches 20 Channel Units 22 Salmonid Distribution and Abundance 24 Salmonid Abundance by Hierarchical Scales 25 Habitat Electivity at Channel Units 25 Salmonid Abundance at Tributary Junctions 25 RESULTS 26 Geomorphic Analysis 26 Segments 26 Reaches 32 Channel Units 44 Salmonid Distribution and Abundance 47 Basin 47 Segments 54 Reaches 56 Tributary Junctions 60 Channel Units 60 DISCUSSION 73 Geomorphology 73 Salmonid Distribution and Abundance 79 CHAPTER III: LAND-USE INFLUENCES ON STREAM HABITAT AND SALMONID ABUNDANCE IN THE DRIFT CREEK TRIBUTARIES 85 INTRODUCTION 85 METHODS 91 Study Design 91 Basin Analysis 91 TABLE OF CONTENTS (continued) Page Stream Habitat Measurements 95 Channel Unit Characteristics 95 Substrate and Spawning Gravels 96 Coarse Woody Debris 96 Salmonid Abundance Estimates 96 Habitat Use by Salmonids 97 Statistical Analysis 98 RESULTS 100 Physical Stream Habitat and Land-Use Effects 100 Channel Unit Composition 100 Widths and Depths 100 Substrate and Spawning Gravel 106 Coarse Woody Debris 107 Salmonid Abundance 109 Relationships With Physical Habitat 109 Habitat Use of Channel Units 114 Land-Use Effects 114 DISCUSSION 123 CHAPTER IV: AN ALSEA WATERSHED STUDY COMPARISON: A TEMPORAL PERSPECTIVE IN THE DRIFT CREEK BASIN ON THE EFFECTS OF LAND USE 129 INTRODUCTION 129 An Overview of the Alsea Watershed Study 129 The Alsea Watershed Study Comparison 132 METHODS 134 Stream Habitat Measurements 134 Alsea Watershed Study 134 The 1988-1989 Study Design 134 Salmonid Population and Biomass Estimates 135 Alsea Watershed Study 135 The 1988-1989 Study Design 135 RESULTS 140 Stream Habitat Measurements 140 Salmonid Population and Biomass Estimates 140 DISCUSSION 149 CHAPTER V: SUMMARY 160 LITERATURE CITED 164 APPENDIX 174 LIST OF FIGURES Figure Page 1. Location of the Drift Creek basin in Oregon; and map showing stream order. 4 2. General distribution of summer-rearing juvenile salmon in the Drift Creek basin. 7 3. Hierarchical scales of basin morphology. 15 4. Drift Creek basin map showing extent of 1988 and 1989 surveys and reach designations. 18 5. Longitudinal profile of valley floor width indices (VFW!) along Drift Creek. Field surveys start at 6.53 km upstream from the confluence of Lyndon Creek. 27 6. Geologic map of Drift Creek basin (based on map by Snavely et al. 1976). 28 7. Longitudinal stream profile of Drift Creek; arrows indicate major slope breaks. 30 8. Longitudinal profile of Hack stream-gradient indices along Drift Creek. 31 9. Longitudinal profile of stream power indices along Drift Creek. 31 10. Longitudinal profile of active channel widths along Drift Creek. Solid arrows indicate locations of hillslope-constrained sub- reaches, and open arrows indicate locations of incised reaches. 38 11. Percent composition of slow-water
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