Effects of different feeding habits of three bivalve species on sediment characteristics and benthic diatom abundance
Effects of different feeding habits of three bivalve species on sediment characteristics and benthic diatom abundance
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DOI：
10.3354/meps299067
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发表时间：
2005-01-01
影响因子：
2.5
通讯作者：
Kikuchi, E
中科院分区：
文献类型：
--
作者：
Kanaya, G;Nobata, E;Kikuchi, E
为了揭示3种双壳类的食性及其对沉积物和底栖硅藻的影响，在日本河口的加茂泻湖进行了野外试验。的表面沉积物的饲养Macoma contabulata减少粉质粘土，总氮，总有机碳含量和三角洲C-13值的沉积物，而表面沉积物的饲养者Nuttallia olivacea和悬浮饲料菲律宾蛤仔没有。表层沉积物的饲养者减少了底栖植物生物量（叶绿素a，ch 1 a）和硅藻密度在沉积物表面和增加的C/N比的沉积物。与此相反，R. philippinarum增加了ch 1 a，但减少了底栖硅藻，表明促进了微藻生长而不是硅藻。不同的双壳类对优势种硅藻密度的降低程度不同，M. contabulata降低了物种丰富度。多维尺度和单向相似性分析表明，双壳贝类根据其食性专门改变了硅藻的丰度和组成，而相对硅藻物种丰度几乎没有变化。这些数据表明，双壳类在摄食底栖硅藻时几乎没有选择性。一个2源混合模型使用Δ C-13值显示，底栖硅藻是更重要的碳源（> 69%）的沉积物喂养的双壳类，无论是在自然栖息地和围隔。与此相反，R.菲律宾藻在自然生境中从悬浮固体（SS）中获得61%的碳，而在围隔中从底栖硅藻中获得62%的碳。该物种的食性变化可能与SS和再悬浮泥沙的供应有关。
To reveal the feeding habits of 3 bivalve species and the effects on the sediment and benthic diatoms, a field experiment was conducted in the estuarine Gamo lagoon, Japan, using enclosures stocked with bivalves. The surface-deposit feeder Macoma contabulata reduced silt-clay, total nitrogen, and total organic carbon content and the delta C-13 value of the sediment, while the surface-deposit feeder Nuttallia olivacea and the suspension feeder Ruditapes philippinarum did not. The surface-deposit feeders reduced phytobenthic biomass (chlorophyll a, ch1 a) and diatom density at the sediment surface and increased the C/N ratios of the sediment. In contrast, R. philippinarum increased ch1 a although it decreased benthic diatoms, suggesting the promotion of microalgal growth other than diatoms. All the bivalve species reduced the densities of the dominant diatom species differently, and M. contabulata decreased the species richness. Multidimensional scaling and 1-way analysis of similarity revealed that the bivalves specifically modified the abundances and composition of the diatoms in relation to their feeding habits, while the relative diatom species abundances hardly changed. These data suggest that the bivalves show little selectivity when they ingest benthic diatoms. A 2-source mixing model using delta C-13 values revealed that benthic diatoms were the more important carbon source (> 69%) for the deposit-feeding bivalves, both in natural habitats and in enclosures. In contrast, R. philippinarum obtained 61% carbon from suspended solids (SS) in the natural habitat, whereas in the enclosures it obtained 62% carbon from benthic diatoms. The dietary change of this species might be related to the supply of SS and resuspended sediment.