Gut content analysis of juvenile shortnose suckers Chasmistes brevirostris Cope, 1879
1997
McDonald, Pat
Ontogenetic niche shifts are critical times in a fish's life that need to be passed forsurvival, growth and recruitment (Gerking 1994, Osenberg et al. 1994). These nicheshifts are identified by a change in feeding from one prey type to another. These shifts infeeding occur throughout growth and can be related to changes in gut morphology andmouth position (Stewart 1926, Macphee 1960).The shortnose sucker (SNS) Chasmistes brevirostris was listed as endangered in1988 with little known about it's feeding habits. Previous diet studies include aqualitative study of adult gut contents (Hazel 1969) and a quantitative study of juvenilegut contents (Buettner and Scoppettone 1990). Both studies examined gut contents ofSNS caught during daylight hours.This study quantifies gut contents of juvenile SNS and relates diet to ontogeneticchanges in gut length, mouth and time of day. In addition, a selectivity index was usedto compare gut contents and potential prey to determine if juvenile SNS exhibitselectivity.
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