Abstract:
:Although ontogenetic changes in the carbon isotope ratios of marine fauna have been well studied those of freshwater organisms have not. As a result, we may have a less than adequate assessment of the incorporation of allochthonous detritus into freshwater foodwebs. This study found a δ13C range of 9‰ for crayfish (Orconectes virilis) from oligotrophic Canadian Shield lakes. Much (60-83%) of this variability was explained by body size. A simple isotopic mixing model suggests that by their third year of life, crayfish in these lakes rely more substantially upon terrestrial detritus than epilithic algae for energy.
journal_name
Oecologiajournal_title
Oecologiaauthors
France Rdoi
10.1007/BF00327908subject
Has Abstractpub_date
1996-07-01 00:00:00pages
239-242issue
2eissn
0029-8549issn
1432-1939pii
10.1007/BF00327908journal_volume
107pub_type
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