Table 3

% Marine-derived nitrogen (MDN) estimates in invertebrates collected above and below waterfall barriers to salmon migration on the Clatse and Neekas Rivers, British Columbia. Estimates of % MDN were made under conditions of no fractionation from the source and maximum fractionation of 4‰ from the source nitrogen by primary producers.

Clatse River


Invertebrate family(ies)

% MDN (No Fractionation)

%MDN (Max Fractionation)


Curculionidae

49.1%

71.5%

Parajulidae

19.4%

28.2%

Carabidae

30.6%

44.6%

Agelenidae/Antrodiaetidae

30.4%

44.3%

Neekas River


Invertebrate family(ies)

%MDN (No Fractionation)

%MDN (Max Fractionation)


Parajulidae

45.8%

62.3%

Carabidae

34.8%

47.3%

Agelenidae/Antrodiaetidae

51.2%

69.6%


Hocking and Reimchen BMC Ecology 2002 2:4   doi:10.1186/1472-6785-2-4

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