1997
DOI: 10.1139/cjfas-54-11-2555
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Energy sources and ecological role of crayfishes in an Ozark stream: insights from stable isotopes and gut analysis

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Cited by 142 publications
(178 citation statements)
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“…Both G. pulex and A. aquaticus function as shredders processing these basal resources within freshwater systems; A. aquaticus was significantly reduced in all crayfish treatments, and G. pulex in the mixed treatment, which infers that reduction in detrital leaves was predominantly due to direct consumption from crayfish. Previous results of gut content analysis similarly infer greater consumption of detritus among adults (Reynolds and O'Keeffe, 2005) which may be explained by lower energy demands for growth within the adult life-stage compared to juveniles (Whitledge and Rabeni, 1997); indeed, our juvenile crayfish showed a three fold higher increase in mass than adults during the experiment. However, adults have been shown to adopt a more protein rich diet comprising a greater proportion of macroinvertebrates during times of high energy demand (e.g.…”
Section: Discussionsupporting
confidence: 79%
“…Both G. pulex and A. aquaticus function as shredders processing these basal resources within freshwater systems; A. aquaticus was significantly reduced in all crayfish treatments, and G. pulex in the mixed treatment, which infers that reduction in detrital leaves was predominantly due to direct consumption from crayfish. Previous results of gut content analysis similarly infer greater consumption of detritus among adults (Reynolds and O'Keeffe, 2005) which may be explained by lower energy demands for growth within the adult life-stage compared to juveniles (Whitledge and Rabeni, 1997); indeed, our juvenile crayfish showed a three fold higher increase in mass than adults during the experiment. However, adults have been shown to adopt a more protein rich diet comprising a greater proportion of macroinvertebrates during times of high energy demand (e.g.…”
Section: Discussionsupporting
confidence: 79%
“…The main prey taxa were Chironomidae larvae, Cladocera and Ephemeroptera larvae, of which the latter tended to be positively selected. A similar high importance of Chironomidae larvae in the diet of Orconectes luteus and O. punctimanus was reported by Whitledge and Rabeni (1997), and a preference for Chironomidae and Ephemeroptera larvae is also known for P. clarkii (Alcorlo et al, 2004). Orconectes immunis positively selected for slow-moving or immobile prey that could be easily captured, such as Dreissena polymorpha and Trichoptera, whereas sediment-dwelling prey, such as Oligochaeta, were significantly underrepresented in the O. immunis stomachs.…”
Section: > Feeding Ecologysupporting
confidence: 66%
“…Increase in length seems to be followed by a dietary shift (Reynolds & O'Keeffe 2005). This has been mentioned by other researchers, who claim that animal material is a more important component in the diet of juveniles, which have a faster growth rate compared with adults (Ilheù & Bernardo 1993;O'Brien 1995;Whitledge & Rabeni 1997).…”
Section: Discussionmentioning
confidence: 76%