Drift, wood, and grazing cattle : macroinvertebrates in managed streams Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/08612s94p

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • The importance of active-entry drift at a community-scale was evaluated by testing whether the placement of wood in streams affected the abundance of Baetis spp. mayflies in drift. Baetis were chosen because they use drift as a behavioral strategy and are important in salmonid diets. The density of woody debris was manipulated in a divided concrete diversion channel by building a debris jam on one side and leaving the other side free flowing. Although the drift density (as measured by Baetis/unit volume) was almost equal between the two channels, more Baetis were retained in the channel with woody debris due to the slower flow rate. While possibly an important behavioral strategy, active-entry by the insects does not appear to be a factor in community-scale macroinvertebrate drift dynamics. The diversion channel results were tested against samples from Badger, Hoffman and Trout Creeks in the Ochoco National Forest. The results of these field tests were inconclusive because of a depression in the number of Baetis in the system apparently as a result of the presence of grazing cattle. Baetis exhibited a complex relationship to wood. Nonmetric Multidimensional Scaling (NMS) ordinations of samples taken from wood and from gravel benthos showed little difference in Baetis response to substrate type. The possible changes in macroinvertebrate assemblages resulting from the presence of cattle in the stream were explored using survey data from Badger Creek as well as benthic samples taken from two comparable reaches of stream, one with cattle and one without. Ordinations of these data indicate dramatic differences in community composition which suggest that the cattle have a greater effect on macroinvertebrate drift than does the presence or absence of wood in the system.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome, 8-bit Grayscale, 24-bit Color) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-11-01T21:46:39Z (GMT) No. of bitstreams: 1 ReedTL1996.pdf: 4734070 bytes, checksum: bd3fdfed1ae3376f51eb155cec9f0e63 (MD5)
  • description.provenance : Submitted by Kaylee Patterson (kdpscanner@gmail.com) on 2012-11-01T21:34:31Z No. of bitstreams: 1 ReedTL1996.pdf: 4734070 bytes, checksum: bd3fdfed1ae3376f51eb155cec9f0e63 (MD5)
  • 1996-06
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-11-02T16:35:16Z (GMT) No. of bitstreams: 1 ReedTL1996.pdf: 4734070 bytes, checksum: bd3fdfed1ae3376f51eb155cec9f0e63 (MD5)
  • description.provenance : Made available in DSpace on 2012-11-02T16:35:18Z (GMT). No. of bitstreams: 1 ReedTL1996.pdf: 4734070 bytes, checksum: bd3fdfed1ae3376f51eb155cec9f0e63 (MD5) Previous issue date: 1995-05-16

Relationships

In Administrative Set:
Last modified: 10/19/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items