Fish-habitat associations on a deep reef at the edge of the Oregon continental shelf Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/t722h958n

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  • Heceta Bank is a large reef on the edge of the central Oregon continental shelf that supports a wide variety of commercial fisheries. Using the research submersible Delta, we studied fish abundances on Heceta Bank and the relationship between species composition of fish assemblages and bottom types. Cluster analysis indicated that fish assemblages were most unique on mud, boulder, rock ridge, mud and cobble, and mud and boulder substrates. Rockfishes, particularly pygmy Sebastes wilsoni, sharpchin S. zacentrus, rosethorn S. helvomaculatus, and yellowtail S. flavidus, were the most abundant fishes and dominated all substrates except mud, where Dover sole Microstomus pacificus and zoarcids Lycodes pacificus were most abundant. Principal component analysis (PCA) and canonical correlation analysis (CCA) were used to determine the sources of variation within the data. PCA demonstrated that habitat variability was a fundamental cause of heterogeneity among fish assemblages. In contrast, CCA showed how species occurrences were related to specific substrates. Ontogenetic shifts in behavior and substrate preference occurred in pygmy rockfish. Small juveniles often formed dense schools above the bank's shallower rocky ridges. Larger individuals occurred in non-polarized assemblages on the bottom in cobble and boulder fields.
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  • v.90 no.3 (1992): 540-551
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  • File scanned at 300 ppi (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.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2015-04-28T16:27:48Z (GMT) No. of bitstreams: 1 FishHabitatAssociationsDeepReef.pdf: 7325846 bytes, checksum: 2a83cd883241631fa22ed67dd3d352aa (MD5)
  • description.provenance : Made available in DSpace on 2015-04-28T16:27:48Z (GMT). No. of bitstreams: 1 FishHabitatAssociationsDeepReef.pdf: 7325846 bytes, checksum: 2a83cd883241631fa22ed67dd3d352aa (MD5) Previous issue date: 1992-07
  • description.provenance : Submitted by Susan Gilmont (susan.gilmont@orst.edu) on 2015-04-27T22:34:44Z No. of bitstreams: 1 FishHabitatAssociationsDeepReef.pdf: 7325846 bytes, checksum: 2a83cd883241631fa22ed67dd3d352aa (MD5)

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