Extracoelenteric zooplankton feeding is a key mechanism of nutrient acquisition for the scleractinian coral Galaxea fascicularis
Extracoelenteric zooplankton feeding is a key mechanism of nutrient acquisition for the scleractinian coral Galaxea fascicularis
复制标题
腔肠外浮游动物摄食是石珊瑚 Galaxea fasciculis 获取营养的关键机制
DOI：
--
复制
发表时间：
2011
影响因子：
2.8
通讯作者：
R. Osinga
中科院分区：
文献类型：
--
作者：
T. Wijgerde;Rara Diantari;M. W. Lewaru;J. Verreth;R. Osinga
内部和外部摄食浮游动物可以为硬核珊瑚提供重要的营养物质。然而，后一个过程从未得到适当的量化。为了量化一种硬核珊瑚捕获、消化和释放浮游动物的动态，我们对束状Galaxea fascularis捕食Artemia nauplii的过程进行了详细的视频分析。观察到一个高度动态的猎物捕获、消化和释放过程。单株束状水螅（N=3）在6 h内捕获558±67株，释放383±75株。平均而言，98.6%的猎物没有被吃掉。相反，猎物被聚集成聚集体，由肠系膜细丝从外部消化。此外，我们还对6个G. fascicularis菌落消化前后的浮游动物进行了碳、氮、磷分析。消化6 h后，总有机碳损失43.1%(0.298±0.148 μg)；总有机氮、总有机磷和正磷酸盐（PO43 -）分别为51.3%（0.059±0.028 μ Artemia-1）、50.9%（0.009±0.004 μ Artemia-1）和84.6%（0.0019±0.0008 μ Artemia-1）。在单采食肠道外浮游动物的情况下，平均每天每cm2珊瑚组织的总营养输入分别为76.5±0.0 μg有机碳、15.2±0.0 μg有机氮、2.3±0.2 μg有机磷和0.5±0.8 μg无机磷。这些数值比基于肠腔内喂养的计算结果高出两个数量级。我们的研究结果表明，肠道外浮游动物摄食是硬核珊瑚获取营养的关键机制。这些结果对珊瑚养殖和我们对珊瑚礁底-上层耦合的理解具有重要意义。
SUMMARY Internal and external feeding on zooplankton may provide scleractinian corals with important nutrients. However, the latter process has never been properly quantified. To quantify the dynamics of zooplankton capture, digestion and release for a scleractinian coral, we performed detailed video analyses of Galaxea fascicularis feeding on Artemia nauplii. A highly dynamic process of prey capture, digestion and release was observed. A single G. fascicularis polyp (N=3) captured 558±67 and released 383±75 Artemia nauplii over a 6 h interval. On average, 98.6% of prey captured was not ingested. Instead, prey items were clustered into aggregates that were digested externally by mesenterial filaments. In addition, we employed carbon, nitrogen and phosphorus analysis of zooplankton before and after digestion by G. fascicularis colonies (N=6). For total organic carbon, 43.1% (0.298±0.148 μg Artemia–1) was lost after 6 h of digestion. For total organic nitrogen, total organic phosphorus and orthophosphate (PO43–), these values were 51.3% (0.059±0.028 μg Artemia–1), 50.9% (0.009±0.004 μg Artemia–1) and 84.6% (0.0019±0.0008 μg Artemia–1), respectively. For extracoelenteric zooplankton feeding alone, total estimated nutrient inputs for G. fascicularis colonies were 76.5±0.0 μg organic carbon, 15.2±0.0 μg organic nitrogen, 2.3±0.2 μg organic phosphorus and 0.5±0.8 μg inorganic phosphorus per cm2 coral tissue per day. These values exceed calculations based on intracoelenteric feeding by up to two orders of magnitude. Our results demonstrate that extracoelenteric zooplankton feeding is a key mechanism of nutrient acquisition for a scleractinian coral. These results are of importance to coral aquaculture and our understanding of benthic–pelagic coupling on coral reefs.
影响因子：
64.8
作者：
Grottoli, AG;Rodrigues, LJ;Palardy, JE
通讯作者：
Palardy, JE