Diet and color polymorphism in the sea star, Pisaster ochraceus Public Deposited

http://ir.library.oregonstate.edu/concern/undergraduate_thesis_or_projects/1831cm336

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  • Pisaster ochraceus occurs in a variety of colors; the major hues being orange, brown, and purple. Harley et al. (2006) found that in areas on the open Pacific coast, where Mytilus californianus was present, less than 10% of the population of P. ochraceus were purple whereas in areas of the San Juan Archipelago and the southern Strait of Georgia, where M. californianus was absent, approximately 95% of the P. ochraceus found were purple. This pattern suggests that the expression of the orange and brown pigmentations may be dependent on the consumption of M. californianus (Fox and Hopkins 1966). The purpose of my research was to investigate whether color is controlled by diet. I hypothesized that by feeding purple individuals M. californianus they would undergo a slight change in color as they began to express orange/brown pigmentation. There were two parts to this study: a laboratory experiment and field surveys. In the laboratory experiment, orange and purple sea stars were fed Pollicipes polymerus or Mytilus californianus. Pictures were taken of each individual twice a week to track any observable color changes over a period of four weeks. No significant color changes were observed in the laboratory. During the field surveys, I examined P. ochraceus diet—as well as other factors—at three sites over a period of four months. Despite previous studies providing suggestive evidence that color may be controlled by diet, I found no significant differences in diet between color morphs. There may be an underlying genetic component that affects color expression, as proposed by Harley et al. (2006). More research is needed to understand the biology of this keystone species.
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  • PowerPoint (.ppt) file was created and converted to .pdf using Microsoft PowerPoint for Windows 2011, Version 14.2.1.
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  • description.provenance : Submitted by Paul Dixson (dixsonp@onid.orst.edu) on 2012-05-31T20:18:27Z No. of bitstreams: 3 license_rdf: 19394 bytes, checksum: 809919443c6e21b8679d27f07924d745 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Pisaster poster with borders.ppt: 1250816 bytes, checksum: ff50fb34598f523e4350686b0f38df67 (MD5)
  • description.provenance : Approved for entry into archive by Sue Kunda(sue.kunda@oregonstate.edu) on 2012-06-01T01:25:28Z (GMT) No. of bitstreams: 4 Pisaster poster.pdf: 909708 bytes, checksum: b7b4aa1dd5b23d86c0c1551df3f293e3 (MD5) Pisaster poster with borders.ppt: 1250816 bytes, checksum: ff50fb34598f523e4350686b0f38df67 (MD5) license_rdf: 19394 bytes, checksum: 809919443c6e21b8679d27f07924d745 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)
  • description.provenance : Made available in DSpace on 2012-06-01T01:25:28Z (GMT). No. of bitstreams: 4 Pisaster poster.pdf: 909708 bytes, checksum: b7b4aa1dd5b23d86c0c1551df3f293e3 (MD5) Pisaster poster with borders.ppt: 1250816 bytes, checksum: ff50fb34598f523e4350686b0f38df67 (MD5) license_rdf: 19394 bytes, checksum: 809919443c6e21b8679d27f07924d745 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)
  • description.provenance : Submitted by Paul Dixson (dixsonp@onid.orst.edu) on 2012-05-31T22:55:44Z No. of bitstreams: 4 Pisaster poster.pdf: 909708 bytes, checksum: b7b4aa1dd5b23d86c0c1551df3f293e3 (MD5) Pisaster poster with borders.ppt: 1250816 bytes, checksum: ff50fb34598f523e4350686b0f38df67 (MD5) license_rdf: 19394 bytes, checksum: 809919443c6e21b8679d27f07924d745 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)
  • description.provenance : Rejected by Sue Kunda(sue.kunda@oregonstate.edu), reason: Hello, Aimee. Could you please convert your ..ppt file to .pdf and resubmit this? You won't lose any of your work. You'll just have to add the additional file. Also, could you add the hardware and software information you used to create and convert the files? For example: PowerPoint (.ppt) file was created and converted to .pdf using Microsoft PowerPoint for Windows 2011, Version 14.2.1. If you have any problems let me know. I'll have your submission uploaded within 3-4 business hours after you complete it and you'll receive an email with the link. Best, Sue Kunda Digital Scholarship Librarian sue.kunda@oregonstate.edu on 2012-05-31T21:53:22Z (GMT)

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