Tracing 13C-enriched dissolved and particulate organic carbon in the bacteria-containing coral reef sponge Halisarca caerulea:: Evidence for DOM feeding
Tracing 13C-enriched dissolved and particulate organic carbon in the bacteria-containing coral reef sponge Halisarca caerulea:: Evidence for DOM feeding
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DOI：
10.4319/lo.2008.53.4.1376
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发表时间：
2008-07-01
影响因子：
4.5
通讯作者：
van Duyl, Fleur C.
中科院分区：
文献类型：
--
作者：
de Goeij, Jasper M.;Moodley, Leon;van Duyl, Fleur C.
在这里，我们报告的含细菌的珊瑚礁海绵Halisarca caerulea的营养动力学。同化和呼吸的C-13-丰富的底物葡萄糖，藻类衍生的溶解和颗粒有机物（DOM和-POM），和细菌在1和6小时的孵育。除葡萄糖外，所有底物都容易被海绵处理，同化是主要的命运。C-13-富集模式的脂肪酸生物标志物显示，海绵溶解的有机C-13同化是直接和细菌介导的示踪碳回收在细菌特异性和非细菌脂肪酸。这是第一个直接证据的DOM纳入海绵。研究结果表明，结壳海绵H. caerulea饲料的DOM和POM，并考虑到其占主导地位的最大的珊瑚礁栖息地（珊瑚腔）的覆盖面，它提出的有机物同化的隐礁海绵可能代表一个重要的，很大程度上被忽视的生态功能。数量上显著的DOM处理可能不是微生物世界对珊瑚礁的唯一功能;海绵将DOM转化为生物量，从而保留和储存珊瑚礁系统中的有机物质。
Here we report on the trophodynamics of the bacteria-containing coral reef sponge Halisarca caerulea. The assimilation and respiration of the C-13-enriched substrates glucose, algal-derived dissolved and particulate organic matter (diatom-DOM and -POM), and bacteria were followed in 1- and 6-h incubations. Except for glucose, all substrates were readily processed by the sponge, with assimilation being the major fate. C-13-Enrichment patterns in fatty acid biomarkers revealed that sponge dissolved organic C-13 assimilation was both direct and bacteria mediated as tracer carbon was recovered both in bacteria-specific and nonbacterial fatty acid. This is the first direct evidence of DOM incorporation by sponges. The present study demonstrates that the encrusting sponge H. caerulea feeds on both DOM and POM and given their dominant coverage of the largest coral reef habitat (coral cavities) it is proposed that organic matter assimilation by cryptic reef sponges may represent an important, largely overlooked ecological function. Quantitatively significant DOM processing may not be the exclusive function of the microbial world on coral reefs; sponges transform DOM to biomass, and thus retain and store organic matter in the reef system.