Dietary responses of tidal flat macrobenthos to reduction of benthic microalgae: a test for potential use of allochthonous organic matter
Dietary responses of tidal flat macrobenthos to reduction of benthic microalgae: a test for potential use of allochthonous organic matter
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潮滩大型底栖动物对底栖微藻减少的饮食反应：外来有机物潜在利用的测试
DOI：
10.3354/meps08094
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发表时间：
2009
影响因子：
2.5
通讯作者：
J. Richardson
中科院分区：
文献类型：
--
作者：
T. Sakamaki;J. Richardson
在2个河口潮滩，采用不透明橡胶覆盖物对底栖微藻进行了实验性减量，并利用δ 13 C和δ 15 N观测了片足类Corophium spinicorne和双壳类Macoma balthica的摄食反应。每一个潮滩（MA和TE）占主导地位的海洋或陆地来源的有机质（OM），分别。我们假设，底栖微藻的减少相应地降低了底栖微藻对大型底栖动物食物的比例，并增强了它们对外来有机质的同化作用。我们的树冠处理减少了35%至40%的叶绿素a在表面沉积物。而M. balthica不受冠层处理的影响，C.两个位点的棘角都发生了显着改变。在MA中，冠层处理降低了C.棘角藻对底栖微藻的影响，并保持其对沉积物中占主导地位的海洋来源的有机质的实质性依赖。相反，在TE中，冠层处理增强了C.棘角藻对底栖微藻的影响，降低了底栖微藻对沉积物中占主导地位的陆源有机质的依赖。林冠处理显著改变了TE沉积物有机质的C：N和δ 15 N。这表明底栖微藻影响了沉积物亚表面的生态地球化学过程和有机质的化学性质。底栖微藻可能间接控制大型底栖动物对沉积物中陆源有机质的营养利用。总体而言，大型底栖动物的膳食组成并不总是与有机质来源的相对丰度成比例变化;外来有机质的化学性质、其生物地球化学变化和物种特异性食物选择性也是重要因素。
We experimentally reduced benthic microalgae using opaque rubber canopy covers and observed dietary responses of Corophium spinicorne (amphipod) and Macoma balthica (bivalve) based on δ 13 C and δ 15 N measurements in 2 estuarine tidal flats. Each of the tidal flats (MA and TE) was predominated by marine- or terrestrial-origin organic matter (OM), respectively. We hypothe- sised that the reduction of benthic microalgae correspondingly decreases the proportion of mac- robenthos diet attributable to benthic microalgae, and enhances their assimilation of allochthonous OM. Our canopy treatment reduced chlorophyll a in the surface sediment by 35 to 40%. While δ 13 C and δ 15 N of M. balthica were not affected by the canopy treatment, the signatures of C. spinicorne were significantly altered at both sites. In MA, the canopy treatment reduced the nutritional depen- dence of C. spinicorne on benthic microalgae and maintained their substantial dependence on the marine-origin OM predominating in the sediment. On the contrary, in TE, the canopy treatment enhanced the nutritional dependence of C. spinicorne on benthic microalgae and lowered their dependence on the terrestrial-origin OM predominating in the sediment. The canopy treatment sig- nificantly changed the C:N and δ 15 N of the sediment OM in TE. This suggests that benthic micro- algae affected biogeochemical processes and the chemical properties of OM in the sediment subsur- face. Benthic microalgae may have indirectly controlled nutritional utilisation of terrestrial-origin OM in the sediment by macrobenthos. Overall, the dietary compositions of macrobenthos did not always vary in proportion to the relative abundance of OM sources; the chemical properties of allochthonous OM, its biogeochemical alterations and species-specific food selectivity are also important factors.
日本山涧中河段规模的冠层覆盖对石蛾幼虫营养途径的影响。
DOI：
--
发表时间：
2007
期刊：
Marine and Freshwater Research Vol.58
影响因子：
--
作者：
Doi;H.;Takemon;Y.;Ohta;T.;Ishida Y.;Kikuchi;E.
通讯作者：
E.
影响因子：
5
作者：
DENIRO, MJ;EPSTEIN, S
通讯作者：
EPSTEIN, S