Nitrogen Budget of the Bivalve Mactra veneriformis, and its Significance in Benthic—pelagic Systems in the Sanbanse Area of Tokyo Bay
Nitrogen Budget of the Bivalve Mactra veneriformis, and its Significance in Benthic—pelagic Systems in the Sanbanse Area of Tokyo Bay
复制标题
双壳类蛤蜊的氮收支及其在东京湾三番濑地区底栖-中上层系统中的意义
DOI：
10.1006/ecss.2001.0905
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发表时间：
2002
影响因子：
2.8
通讯作者：
A. Iijima
中科院分区：
文献类型：
--
作者：
T. Hiwatari;K. Kohata;A. Iijima
为了研究日本东京湾浅水区三板滩悬浮式双壳贝类的氮素收支，于1998年初夏进行了野外调查和室内实验。三班寺地区是东京湾仅存的几个潮间带湿地之一，对于迁徙的涉水者、文蛤渔业和紫菜养殖都具有重要意义。浮游贝类生物量优势种为文昌鱼、中国文昌鱼和菲律宾蛤仔。
在这三个物种中，在三班斯的Funabashi地区，性文昌鱼是优势种。在实验室条件下，浮桥地区典型的双壳类体型--华支睾吸虫的滤水率为0.95 L g−1肉干重h−1，相当于408μg N g−1肉干重h−1。在20℃时，浮桥地区华支睾吸虫的氨和粪便排泄率分别为35·0μg N g−1肉干重h−1和45.4μg N g−1肉干重h−1。种群以氨的形式排出了8.6%的过滤氮，以粪便和假粪便的形式排出了22.2%的过滤氮，69.2%的氮转化为生长。较高的生长率表明，在初夏，华支睾吸虫种群有效地将远洋初级生产力转移到较高的营养水平。
To examine the nitrogen budget of the suspension feeding bivalve Mactra veneriformis in the Sanbanse, a shallow (<5 m) part of Tokyo Bay, Japan, field surveys and laboratory experiments were conducted in early summer, 1998. The Sanbanse area is one of the few remaining areas of intertidal wetland in Tokyo Bay and is an area of significant importance for migrating waders and as a clam fishery and for laver culture. Three infaunal suspension-feeding bivalves, Mactra veneriformis, M. chinensis and Ruditapes philippinarum, were found as the dominant species in terms of biomass.
Of these three species, Mactra veneriformis was dominant in the Funabashi area of the Sanbanse. In laboratory experiments, the filtration rate of M. veneriformis (525–918 mg of flesh dry weight), a representative size of the bivalve in the Funabashi area, was 0·95 l g−1 flesh dry weight h−1 corresponding to 408 μg N g−1 flesh dry weight h−1. The excretion rates of ammonia and faeces were 35·0 μg N g−1 flesh dry weight h−1 and 45·4 μg N g−1 flesh dry weight h−1, respectively, at 20 °C. Based on the nitrogen budget of M. veneriformis in the Funabashi area in early summer, the population excreted 8·6% of the filtered nitrogen as ammonia and egested 22·2% of the filtered nitrogen as faeces and pseudofaeces, and converted 69·2% as growth. The high growth ratio indicates that the M. veneriformis population efficiently transfers the pelagic primary production to higher trophic levels in the early summer.