Herbivory by a north temperate stream fish, Acrocheilus alutaceus (Agassiz & Pickering) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9g54xm983

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Documentation of the seasonal feeding habits and ability to assimilate algae are presented for the first time for a North American grazing stream fish. The chiselmouth, Acrocheilus alutaceus, begins feeding on algal matter in early spring and has deposited large fat reserves prior to an early summer spawning season. A sharp decline in body fat content is then associated with a reduction in food intake at the onset of spawning. A subsequent increase in food intake, possibly with a higher energy value due to the inclusion of animal material, quickly restores fat reserves which then remain high through a period of almost exclusive herbivory (particularly on diatoms) in the late summer and fall. With the onset of winter, the diet of A. alutaceus shifts toward omnivory. Diatoms of the genera Cymbella, Gomphoneis, Synedra, and Melosira form the bulk of the diet. Both diatom and green algal food sources were assimilated by A. alutaceus, but at relatively low efficiency. The efficiency of assimilation of Ulothrix varied inversely with ration size, while the assimilation of diatoms was unaffected by ration size. Fiber was not assimilated. The protein fraction was assimilated more efficiently (44%) than total energy (33%). The order of preference evidenced in A. alutaceus feeding trials was: diatom > bluegreen > green > "mix" > moss. The ratio of digestible protein to digestible energy (P/E) in the food sources proved an excellent descriptor of observed preference. However, a linear combination of fiber content (as a negative factor) and gross P/E (as a positive factor) provided an analytically simpler descriptor and also predicted the correct order of preference. Chiselmouths apparently live much longer (22+ yrs) than was previously known (6 yrs). Formation of the opaque zone, generally recognized as indicating a growth period, is most evident on A. alutaceus otoliths from July through October. This coincides with the period of highest food intake and peak contribution of diatoms to the natural diet.
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, 256 Grayscale) using Capture Perfect 3.0.82 on a Canon DR-9080C 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 2013-04-04T21:09:41Z (GMT) No. of bitstreams: 1 LassuyDennisR1991.pdf: 3564077 bytes, checksum: aa10cf6f536b2f916919f93ed1c6ac35 (MD5)
  • description.provenance : Made available in DSpace on 2013-04-08T20:30:11Z (GMT). No. of bitstreams: 1 LassuyDennisR1991.pdf: 3564077 bytes, checksum: aa10cf6f536b2f916919f93ed1c6ac35 (MD5) Previous issue date: 1990-08-10
  • description.provenance : Submitted by Kevin Martin (martikev@onid.orst.edu) on 2013-04-04T20:55:36Z No. of bitstreams: 1 LassuyDennisR1991.pdf: 3564077 bytes, checksum: aa10cf6f536b2f916919f93ed1c6ac35 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-04-04T20:01:03Z (GMT) No. of bitstreams: 1 LassuyDennisR1991.pdf: 3393058 bytes, checksum: 709b0a209d7c7a5204addb0fcddd47ba (MD5)
  • description.provenance : Rejected by Patricia Black(patricia.black@oregonstate.edu), reason: Replace page. on 2013-04-04T20:11:59Z (GMT)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-04-08T20:30:11Z (GMT) No. of bitstreams: 1 LassuyDennisR1991.pdf: 3564077 bytes, checksum: aa10cf6f536b2f916919f93ed1c6ac35 (MD5)
  • description.provenance : Submitted by Kevin Martin (martikev@onid.orst.edu) on 2013-03-29T20:15:58Z No. of bitstreams: 1 LassuyDennisR1991.pdf: 3393058 bytes, checksum: 709b0a209d7c7a5204addb0fcddd47ba (MD5)

Relationships

In Administrative Set:
Last modified: 08/16/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items