The current investigation identified fatty acids (FAs) and quantified total and specific FA concentrations in the striped shore crab, Pachygrapsus crassipes. I examined changes in the abundance of individual FAs and FA saturation categories (saturated, monounsaturated, polyunsaturated) over months and between sexes. Fatty acid fluctuations were compared with reported temperatures from a location near the collection site to determine whether temperature significantly contributed to these changes. The abundances of palmitoleic acid, palmitic acid, and docosahexaenoic acid (DHA) were found to fluctuate significantly on a monthly basis, with a higher abundance in warm months than in cold months. This fluctuation appeared to be independent of temperature, however, as an increase in FA abundance between February and April preceded an increase in temperature. I did not find a significant difference in FA abundance between females and males. Saturation levels were only different between sexes when monounsaturated FAs (MUFA) were lower in males than in females in December. No overall difference existed between sexes. Therefore, results for sexes were pooled for subsequent analyses.
Changes in FAs could be an acclimatory mechanism used by P. crassipesto take advantage of their biochemical properties in different temperatures. I concluded that while temperature may affect FA abundance, there may be other underlying factors influencing FA abundance. These factors may include molting, seasonality of food abundance, mating, and reproduction. The results of this study may serve as a comparative model for other shore crabs, as well as to establish baseline values of existing FA concentrations in P. crassipes for use in future research.
","abstract_html":"<p>The current investigation identified fatty acids (FAs) and quantified total and specific FA concentrations in the striped shore crab, <em>Pachygrapsus crassipes.</em> I examined changes in the abundance of individual FAs and FA saturation categories (saturated, monounsaturated, polyunsaturated) over months and between sexes. Fatty acid fluctuations were compared with reported temperatures from a location near the collection site to determine whether temperature significantly contributed to these changes. The abundances of palmitoleic acid, palmitic acid, and docosahexaenoic acid (DHA) were found to fluctuate significantly on a monthly basis, with a higher abundance in warm months than in cold months. This fluctuation appeared to be independent of temperature, however, as an increase in FA abundance between February and April preceded an increase in temperature. I did not find a significant difference in FA abundance between females and males. Saturation levels were only different between sexes when monounsaturated FAs (MUFA) were lower in males than in females in December. No overall difference existed between sexes. Therefore, results for sexes were pooled for subsequent analyses.</p> <p>Changes in FAs could be an acclimatory mechanism used by <em>P. crassipes</em>to take advantage of their biochemical properties in different temperatures. I concluded that while temperature may affect FA abundance, there may be other underlying factors influencing FA abundance. These factors may include molting, seasonality of food abundance, mating, and reproduction. The results of this study may serve as a comparative model for other shore crabs, as well as to establish baseline values of existing FA concentrations in <em>P. crassipes</em> for use in future research.</p>","abstract_has_math":false,"creators":["Sjoboen, April Dawn"],"institution":null,"degree_name":"Master of Science (MS)","degree_level":"Thesis","degree_discipline":"Biology","degree_department":null,"school":null,"contributors":["Stephen G. Dunbar","Danilo S. Bošković","William K. Hayes"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2007,"date_issued":"2007-12-01T08:00:00Z","date_published":"2007-12-01T08:00:00Z","updated_at":"2026-07-24T02:53:20Z","subjects":["Marine Biology","Crabs -- Physiological effect -- Southern California; Fatty acids -- Metabolism; Ocean temperature."],"languages":["English"],"rights":["This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://scholarsrepository.llu.edu/etd/951","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Stephen G. Dunbar","Danilo S. Bošković","William K. 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The author retains all other copyrights."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholarsrepository.llu.edu/etd/951"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The current investigation identified fatty acids (FAs) and quantified total and specific FA concentrations in the striped shore crab, Pachygrapsus crassipes. I examined changes in the abundance of individual FAs and FA saturation categories (saturated, monounsaturated, polyunsaturated) over months and between sexes. Fatty acid fluctuations were compared with reported temperatures from a location near the collection site to determine whether temperature significantly contributed to these changes. The abundances of palmitoleic acid, palmitic acid, and docosahexaenoic acid (DHA) were found to fluctuate significantly on a monthly basis, with a higher abundance in warm months than in cold months. This fluctuation appeared to be independent of temperature, however, as an increase in FA abundance between February and April preceded an increase in temperature. I did not find a significant difference in FA abundance between females and males. Saturation levels were only different between sexes when monounsaturated FAs (MUFA) were lower in males than in females in December. No overall difference existed between sexes. Therefore, results for sexes were pooled for subsequent analyses.
Changes in FAs could be an acclimatory mechanism used by P. crassipesto take advantage of their biochemical properties in different temperatures. I concluded that while temperature may affect FA abundance, there may be other underlying factors influencing FA abundance. These factors may include molting, seasonality of food abundance, mating, and reproduction. The results of this study may serve as a comparative model for other shore crabs, as well as to establish baseline values of existing FA concentrations in P. crassipes for use in future research.
"]},{"key":"dc:title","label":"Title","values":["Temporal Fatty Acid Fluctuations of Pachygrapsus crassipes in Southern California"]}]}],"canonical_facts":{"dc:contributor":["Stephen G. Dunbar","Danilo S. Bošković","William K. Hayes"],"dc:creator":["Sjoboen, April Dawn"],"dc:description.abstract":["The current investigation identified fatty acids (FAs) and quantified total and specific FA concentrations in the striped shore crab, Pachygrapsus crassipes. I examined changes in the abundance of individual FAs and FA saturation categories (saturated, monounsaturated, polyunsaturated) over months and between sexes. Fatty acid fluctuations were compared with reported temperatures from a location near the collection site to determine whether temperature significantly contributed to these changes. The abundances of palmitoleic acid, palmitic acid, and docosahexaenoic acid (DHA) were found to fluctuate significantly on a monthly basis, with a higher abundance in warm months than in cold months. This fluctuation appeared to be independent of temperature, however, as an increase in FA abundance between February and April preceded an increase in temperature. I did not find a significant difference in FA abundance between females and males. Saturation levels were only different between sexes when monounsaturated FAs (MUFA) were lower in males than in females in December. No overall difference existed between sexes. Therefore, results for sexes were pooled for subsequent analyses.
Changes in FAs could be an acclimatory mechanism used by P. crassipesto take advantage of their biochemical properties in different temperatures. I concluded that while temperature may affect FA abundance, there may be other underlying factors influencing FA abundance. These factors may include molting, seasonality of food abundance, mating, and reproduction. The results of this study may serve as a comparative model for other shore crabs, as well as to establish baseline values of existing FA concentrations in P. crassipes for use in future research.
"],"dc:identifier":["https://scholarsrepository.llu.edu/etd/951"],"dc:language":["English"],"dc:rights":["This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights."],"dc:subject":["Marine Biology","Crabs -- Physiological effect -- Southern California; Fatty acids -- Metabolism; Ocean temperature."],"dc:title":["Temporal Fatty Acid Fluctuations of Pachygrapsus crassipes in Southern California"],"thesis:degree_discipline":["Biology"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["Master of Science (MS)"]},"updated_at":"2026-07-24T02:53:20Z"}