Gut content analysis of juvenile shortnose suckers Chasmistes brevirostris Cope, 1879 Public Deposited

http://ir.library.oregonstate.edu/concern/undergraduate_thesis_or_projects/pz50h142f

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  • Ontogenetic niche shifts are critical times in a fish's life that need to be passed for survival, growth and recruitment (Gerking 1994, Osenberg et al. 1994). These niche shifts are identified by a change in feeding from one prey type to another. These shifts in feeding occur throughout growth and can be related to changes in gut morphology and mouth position (Stewart 1926, Macphee 1960). The shortnose sucker (SNS) Chasmistes brevirostris was listed as endangered in 1988 with little known about it's feeding habits. Previous diet studies include a qualitative study of adult gut contents (Hazel 1969) and a quantitative study of juvenile gut contents (Buettner and Scoppettone 1990). Both studies examined gut contents of SNS caught during daylight hours. This study quantifies gut contents of juvenile SNS and relates diet to ontogenetic changes in gut length, mouth and time of day. In addition, a selectivity index was used to compare gut contents and potential prey to determine if juvenile SNS exhibit selectivity.
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