Interaction between natural planktonic ecosystem and cultured animals in the coastal aquaculture environment.

沿海水产养殖环境中自然浮游生态系统与养殖动物的相互作用。

• 批准号: 10660177
• 负责人: TANIMURA Atsushi
• 金额: $ 1.79万
• 依托单位: Mie University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10660177/
• 关键词: culture farming; natural plankton ecosystem; Ago Bay; Matoya Bay; nutrients; chlorophyll a; microbial food chain; river discharge; 英虞湾; カイアシ類; Olthona; Acartia; Paracalanus; クロロフィルa; 物質循環; 種の多様性; ピコプランクトン; ナノプランクトン

The aim of the present study is to assess the possible environmental impact caused by culture farming and river discharge. Intensive data collection and observations were carried out during 1996 and 2000 to determined the variations of physical and chemical parameters and their impacts on the natural plankton ecosystem in Ago Bay and Matoya Bay, which are both typical embayments with pearl oyster and/or oyster culture grounds, respectively.In Ago Bay, nutrients were continuously supplied from the bottom sediment during summer. The size-fractionated chlorophyll a measurements and the microscopic observations revealed that the picoplankton and nanoplankton were major components in term of carbon biomass throughout the year. The calculated potential carbon flow from pico-sized plankton including bacteria to micro-sized plankton indicate that the conduit for organic materials is driven inainly through the microbial food web, e.g. picoplankton-heterotrophic nanoflagellates-microzooplankton, … More througout the year. It is also suggested that the microbial food chain affect the mesozooplankton biomass.In Matoya Bay, the phytoplankton biomass based on chlorophyll a increased in summer and autumn. NO_3-N was mainly supplied from the inflow rivers and the concentration increased in summer and autumn in the bay. PO_4-P and NO_2-N were mainly supplied through regeneration from the bottom at the interior bay, and the active regeneration of PO_4-P occurred in summer and autumn. The main source of SiO_2-Si in the bay was the inflow rivers, but it also influenced by regeneration from the bottom at the interior bay in summer and autumn. Redfield-ratio and half saturation constants were indicated that phytoplankton biomass in the bay was usually limited by nitrogen, and occasionally, by phosphorus when river flow was higher in summer and autumn. Therefore, it was suggested that loading nitrogen from the inflow rivers and active regeneration of PO_4-P from the bottom at the interior bay triggered the increase of phytoplankton biomass in summer and autumn. Less

本研究的目的是评估养殖业和河流排放可能造成的环境影响。1996年和2000年，通过对典型的珠母贝养殖湾--Ago湾和Matoya湾的调查，研究了夏季底质营养盐持续供应下，Ago湾和Matoya湾的理化参数变化及其对自然浮游生物生态系统的影响。粒度分级的叶绿素a测量和显微镜观察表明，微微浮游生物和微型浮游生物是全年碳生物量的主要组成部分。从包括细菌在内的微微级浮游生物到微型浮游生物的计算出的潜在碳流表明，有机物质的管道主要是通过微生物食物网驱动的，例如微微级浮游生物-异养纳米鞭毛虫-微型浮游动物， ...更多信息 一年到头了。在Matoya湾，以叶绿素a为基础的浮游植物生物量在夏季和秋季增加。湾内NO_3-N主要来源于入湾河流，夏季和秋季浓度呈上升趋势。PO_4-P和NO_2-N在湾内主要由底层再生提供，且PO_4-P的再生活跃期在夏秋两季。湾内SiO_2-Si的主要来源是流入的河流，但也受到夏秋季湾内底部再生的影响。Redfield比和半饱和常数表明，在夏季和秋季河流流量较高时，海湾浮游植物生物量通常受到氮的限制，偶尔也会受到磷的限制。因此，在夏秋季，入流河流的氮负荷和湾内底层PO_4-P的主动再生是引起浮游植物生物量增加的主要原因。少

项目成果

Imai, T.: "Influence of river discharge to the phytoplankton biomass in Matoya Bay, central Japan."Bulletin of the Japanese Society of Fisheries Oceanography. 64. 215-223 (2000)

Imai, T.：“河流流量对日本中部马托亚湾浮游植物生物量的影响。”日本水产海洋学会公报。

Ishikawa,A.: "Vegitative cell and cyst assamblages of armo red dinoflagellates in Onagawa Bay, northeast Japan"Plankton Biology and Ecology. 47. 12-22 (2000)

Ishikawa,A.：“日本东北部女川湾阿莫红甲藻的营养细胞和囊肿组合”浮游生物生物学和生态学。