Stable carbon isotopes as pelagic food web tracers in adjacent shelf and slope regions off British Columbia, Canada

被引:51
作者
Perry, RI [1 ]
Thompson, PA
Mackas, DL
Harrison, PJ
Yelland, DR
机构
[1] Dept Fisheries & Oceans, Pacific Biol Stn, Nanaimo, BC V9R 5K6, Canada
[2] Univ Tasmania, Dept Aquaculture, Launceston, Tas 7250, Australia
[3] Inst Ocean Sci, Dept Fisheries & Oceans, Sidney, BC V8L 4B2, Canada
[4] Univ British Columbia, Dept Earth & Ocean Sci, Vancouver, BC V6T 1Z4, Canada
关键词
D O I
10.1139/cjfas-56-12-2477
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Surveys were conducted in spring 1992 to examine the use of C-13/C-12 ratios to differentiate pelagic food webs and to trace food web interactions between adjacent continental shelf and slope/deep ocean environments off southwestern British Columbia, Canada. Salinity was used to define shelf or slope/deep ocean water masses and their productivity conditions because eddies and meanders at the shelf break were observed to draw water off the shelf. The C-13/C-12 ratio of plankton was related to the mean upper layer (0-50 m) salinity. C-13 abundance was enriched (relative to C-12) in the shelf water mass compared with the slope water mass. This enrichment persisted up the food web from particulate organic matter through three size-classes of zooplankton to larval fish. The cross-shelf spatial scale separating these food webs, as determined from spatial semivariograms of C-13/C-12 and the upper layer mean salinity, was 40-45 km, similar to the Rossby radius for eddies at this location (50 km). Larval fish may provide a means to monitor exchanges of plankton between geographically adjacent food webs if time scales for incorporation of new isotope signatures from diets into tissues are determined.
引用
收藏
页码:2477 / 2486
页数:10
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