Stable isotope analysis of nutrient pathways leading to Atlantic salmon

被引:78
作者
Doucett, RR
Power, G
Barton, DR
Drimmie, RJ
Cunjak, RA
机构
[1] UNIV WATERLOO,ENVIRONM ISOTOPE LAB,DEPT EARTH SCI,WATERLOO,ON N2L 3G1,CANADA
[2] DIV ENVIRONM STUDIES,DEPT FISHERIES & OCEANS,MONCTON,NB E1C 9B6,CANADA
关键词
D O I
10.1139/cjfas-53-9-2058
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
The relative contribution of terrestrial and aquatic primary energy sources in food webs along a stream continuum in the Miramichi River system, New Brunswick, was investigated through the use of stable carbon and nitrogen isotope ratios. In sites where these primary energy sources were isotopically distinct, quantitative mixing models were used to identify the relative importance of alIochthonous carbon in the diets of wild juvenile Atlantic salmon (Salmo salar) and other resident stream fishes. The delta(13)C data of the stream fauna ranged from -34 parts per thousand to -20 parts per thousand, suggesting variable assimilation of allochthonous and autochthonous carbon sources at the four study sites. Results from the mixing model were congruent with the stream continuum hypothesis, indicating that fishes in the headwaters of Catamaran Brook were more dependent (>85%) on allochthonous carbon sources than those in sites located downstream (36-52%). Stable nitrogen isotope distributions successfully described food web structure in this study, suggesting at least 2.5-3.5 trophic levels in these lotic ecosystems. Stable isotope ratios of carbon were particularly useful for illustrating seasonal changes in food resources of recently emerged age 0+ salmon as maternally derived marine carbon was subsequently diluted by freshwater carbon over the growing season.
引用
收藏
页码:2058 / 2066
页数:9
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