Selection of food sources by Ruditapes philippinarum and Mactra veneriformis (Bivalva: Mollusca) determined from stable isotope analysis
Selection of food sources by Ruditapes philippinarum and Mactra veneriformis (Bivalva: Mollusca) determined from stable isotope analysis
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DOI：
10.1111/j.1444-2906.2003.00764.x
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发表时间：
2004-02-01
影响因子：
1.9
通讯作者：
Sakamoto, W
中科院分区：
文献类型：
--
作者：
Kasai, A;Horie, H;Sakamoto, W
通过对菲律宾蛤仔和四角蛤蜊体内碳、氮同位素组成的测定，探讨了两种贝类在河口生态系统中的作用。的同位素签名进行了比较，从颗粒有机质（POM）在中游的河流，在河口，河口。这两种双壳贝类的δ（13）C和δ（15）N值都是恒定的，约为-17ppm。和10 ppm。与生境中的POM（-25ppm）相比，有显著的富集。和千分之四）。陆生有机质对栖息地中POM和双壳类食物的相对贡献估计：前者约为90%，而后者约为10%。这表明，双壳类选择海洋POM在其栖息地的有机质，并发挥了较小的作用，在直接去除陆地颗粒物。两种贝类的δ（13）C和δ（15）N的时间变化都很小，但δ（13）C在一段时间的大雨后明显下降。在降雨期间，栖息地中陆地物质的浓度增加，双壳类将不得不暂时改变它们的食物来源。
Carbon and nitrogen isotopic ratios in the body of the bivalves Ruditapes philippinarum and Mactra veneriformis were measured to estimate the role of the bivalves in the ecosystem in an estuary. The isotopic signatures were compared with those obtained from particulate organic matter (POM) in the middle reach of the river, in the estuary, and off the estuary. Both the bivalves showed constant delta(13)C and delta(15)N values of approximately -17parts per thousand. and 10parts per thousand. that were significantly enriched compared with those for POM in the habitat (-25parts per thousand. and 4parts per thousand.). The relative contributions of terrestrial organic matter to the POM in the habitat and to the bivalve diet were estimated: the former was approximately 90% while the latter approximately 10%. This indicates that the bivalves select marine POM from the organic matter available in their habitat, and play a minor role in the direct removal of terrestrial particulate matter. Temporal changes in delta(13)C and delta(15)N for both bivalves were small, but a distinct decrease in delta(13)C was observed following a period of heavy rain. During rainfall the concentration of terrestrial material increased in the habitat, and the bivalves would then have to change their food sources temporarily.