Mechanistic interpretation of carbon isotope discrimination by marine macroalgae and seagrasses.
Mechanistic interpretation of carbon isotope discrimination by marine macroalgae and seagrasses.
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DOI：
10.1071/pp01201
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发表时间：
2002-04
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影响因子：
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通讯作者：
J. Raven;A. Johnston;J. Kübler;R. Korb;S. Mcinroy;L. Handley;C. Scrimgeour;D. Walker;J. Beardall-J.
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文献类型：
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作者：
J. Raven;A. Johnston;J. Kübler;R. Korb;S. Mcinroy;L. Handley;C. Scrimgeour;D. Walker;J. Beardall-J.
文献和作者实验室以前未发表的数据表明，从自然环境中采集的大型海藻和海草中有机质的δ 13 C范围为-3 ‰至-35‰。虽然一些大型海藻的δ 13 C值在个体的叶状体中超过10‰（一些大型褐藻），但在其他情况下，在非常广泛的地理范围内收集的物种中的δ 13 C值仅为5‰（例如红色的Plocamium cartilagineum的δ 13 C值在-30 ‰和-35‰之间）。δ 13 C极负（低于-30‰）的生物主要为潮下带红藻，也有少量潮间带红藻和少量绿色藻; δ 13 C极正（高于-10‰）的生物主要为绿色大型藻和海草，也有少量红藻和褐藻。δ 13 C值主要与分类学相关，其次与生态学相关。δ ~（13）C值低于-30‰的生物体均不含蛋白核。以前的工作表明，δ 13 C值低于-30‰之间的良好的相关性和缺乏的CO2浓缩机制的几种海洋红藻。在何种程度上低δ 13 C值仅限于生物与扩散CO2进入进行了讨论。在δ 13 C值较高的生物中，如果扩散电导相对较低，也可能发生扩散CO2进入。δ 13 C值大于-10‰（即比海水中CO2的δ 13 C值更正）的生物的光合作用必须涉及HCO 3-的使用。
The literature, and previously unpublished data from the authors' laboratories, shows that the δ13C of organic matter in marine macroalgae and seagrasses collected from the natural environment ranges from -3 to -35‰. While some marine macroalgae have δ13C values ranging over more than 10‰ within the thallus of an individual (some brown macroalgae), in other cases the range within a species collected over a very wide geographical range is only 5‰ (e.g. the red alga Plocamium cartilagineum which has values between -30 and -35‰). The organisms with very negative δ13C (lower than -30‰) are mainly subtidal red algae, with some intertidal red algae and a few green algae; those with very positive δ13C values (higher than -10‰) are mainly green macroalgae and seagrasses, with some red and brown macroalgae. The δ13C value correlates primarily with taxonomy and secondarily with ecology. None of the organisms with δ13C values lower than -30‰ have pyrenoids. Previous work showed a good correlation between δ13C values lower than -30‰ and the lack of CO2 concentrating mechanisms for several species of marine red algae. The extent to which the low δ13C values are confined to organisms with diffusive CO2 entry is discussed. Diffusive CO2 entry could also occur in organisms with higher δ13C values if diffusive conductance was relatively low. The photosynthesis of organisms with δ13C values more positive than -10‰ (i.e. more positive than the δ13C of CO2 in seawater) must involve HCO3- use.