摘要
There are many sand banks in Seto Inland Sea, making patchy shallow zones less than 10 m deep. Due to the shallow environment, the surface sediment on the sand banks in the Hojo area, in the southern part of Aki Nada, Shikoku Island, Japan, often has a larger amount of benthic microalgae than other areas. We hypothesized that benthic microalgae contributed to the secondary production of coastal waters around sand bank areas, and investigated the food-web structure of the Hojo area using stable isotopes in early summer, mid summer and fall. Mean carbon isotopic signatures of several consumers in early summer (−16.9 to −15.1‰ for polychaeta; −17.3 to 13.9‰ for brachyuran crabs; −17.2 to −15.3 for fish) and fall (−16.2 to −14.3‰ for shrimps; −14.0 to −11.2‰ for brachyuran crabs) were more enriched than that of the particulate organic materials of the surface water around sand banks (mainly phytoplankton) (−20.5±0.0‰ in early summer and −18.3±0.1‰ in fall). Organic materials attached to cobbles, representative of benthic microalgae, showed similar or more enriched signatures than consumers (−14.7±0.0‰ in early summer and −10.3±0.0‰ in fall). These results suggest that benthic microalgae on the sand bank contribute greatly to the secondary or higher production of coastal waters in Hojo area.
摘要译文
有很多沙子银行在濑户内海,使零散的浅区不到10米深。由于浅水环境,在北条地区在沙滩上银行的表层沉积物,在亚希滩,四国岛,日本,南部经常有底栖微藻比其他地区的用量较大。我们假设,底栖微藻促成沙周围地区银行沿海水域的二次生产,使用稳定同位素初夏,盛夏和秋季调查的北条地区的食物网结构。意思是在初夏(-16.9至-15几位消费者的碳同位素特征。1‰,多毛类; -17.3至13.9‰,短尾螃蟹; -17.2至-15.3鱼)和下降(-16.2 -14.3至为‰虾; -14.0至-11。2‰的短尾蟹)均高于周围沙洲地表水(主要是浮游植物)(-20.5±0.0‰,初夏和-18.3±0的颗粒有机物质更丰富。1‰,下降)。附鹅卵石的有机材料,代表底栖微藻,表现出类似或更丰富的签名不是消费者(-14.7±0.0‰,初夏和-10.3±0.0年秋季‰)。这些结果表明,在沙滩上银行底栖微藻极大地沿海水域北条地区的中专以上学历的生产贡献力量。
Kenji Yoshino[1]; Hitoshi Miyasaka[1]; Yuji Kawamura[1]; Motomi Genkai-Kato[1]; Noboru Okuda[1]; Yuichi Hayami[1]; Sayaka Ito[1]; Kayoko Fukumori[1]; Tomohiro Sekiguchi[1]; Hidejiro Ohnishi[1]; Koji Ohmori[1];Hidetaka Takeoka[1]. Sand banks contribute to the production of coastal waters by making a habitat for benthic microalgae in the sublittoral zone: food web analyses in Aki-Nada using stable isotopes[J]. Plankton and Benthos Research, 2006,1(3): 155-163