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We used stable isotopes of carbon, hydrogen and nitrogen to quantify the trophic position and resource use of larval sea lamprey Petromyzon marinus, four benthic macroinvertebrate functional feeding guilds (scraper, shredder, collector and predator) and other fishes in three rivers in eastern Canada. Larval lamprey and most invertebrate guilds foraged as primary consumers in all rivers whereas all other fishes predominantly foraged as secondary consumers. Larval lamprey obtained 75–85% of their resources from allochthonous derived material. This level exceeded all invertebrate guilds, which assimilated approximately 50% allochthonous and 50% autochthonous materials and fishes, which predominantly assimilated between 25% and 60% allochthonous material. Larval lamprey occupied a unique position within the river food webs analysed and show remarkable fidelity to a trophic niche specialising on terrestrially derived detritus. [ABSTRACT FROM AUTHOR]

Prentiss et al. (2003) have argued for a relatively recent, short (1600-1100 B.P.), and noncontinuous occupation of large villages and large housepits on the British Columbian Plateau. They argue that these developments resulted from climatically induced resource impoverishment in the region. I maintain that their database is inadequate for such conclusions and that their interpretations are in conflict with dates that 1 obtained from large housepits as well as with the distribution of early point styles (dating from 1200-4800 B.P.) that concentrate in the rim middens of large and medium-sized housepits. These data indicate that large villages and housepits that emerged by 2600 B.P., or earlier, were continuously occupied and corresponded more to the development of collector-based technologies rather than any climatic deteriorations or the introduction of the bow and arrow. [ABSTRACT FROM AUTHOR]

Abstract: This study applied ancient DNA techniques to achieve accurate species identifications for the archaeological salmon remains recovered from the prehistoric pithouse village of Keatley Creek in British Columbia, Canada. Previous archaeological studies indicate that economic stratification within the community might have resulted in differential access to some preferred salmon species, such as sockeye and chinook. Unambiguous ancient DNA species identification now makes it possible to more accurately address the issue of early salmon resource utilization in the region. This study analyzed 60 salmon remains from two specialized structures and two residential structures in order to identify any species differences among bony salmon remains found within the structure. Although high success rates (over 90%) were obtained for ancient DNA tests, only three species (chinook, sockeye and coho salmon) were identified from the remains. Pink salmon was not identified among the tested sample, despite the fact that it was originally assumed to be a staple species for the site''s native inhabitants. The absence of pink salmon in our sample significantly altered the picture of early salmon fishing activities in the region. As a result, the effects of economic stratification on differential access to the remaining so-called preferred species of sockeye and chinook within the four structures studied were not as dramatic as previously thought, although differences among the structures could still be observed. [Copyright &y& Elsevier]