扁担塘螺类生产力的研究Ⅰ.铜锈环棱螺的周年生产量
PRODUCTION OF GASTROPODS IN LAKE BIANDANTANGI.ANNUAL PRODUCTION OF BELLAMYA AERUGINOSA
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摘要: 1996-1997年对扁担塘螺类优势种之一铜锈环棱螺进行了周年研究,结果表明其种群含四个年龄组,其中1996年组生长最快,其带壳湿重瞬时生长率为4.15,去壳干重瞬时生长率为3.40.采用瞬时生长率法测算其周年生产量为：带壳湿重,15.77g·m-2·a-1;去壳干重,0.8624g·m-2·a-1.P/B系数基本一致,分别为0.50,0.51.铜锈环棱螺的生产量的去壳干重(Wd,g·m-2·a-1)和带壳湿重(Ww,g·m-2·a-1)满足下列关系：Ww=17.20Wd.Abstract: An investigation on one of the dominant species of gastropods, Bellamya aeruginosa in Lake Biandantang was carried out from April, 1996 to March,1997.The results showed that the population was composed of four year classes, amongwhich the 1996 year class grew most quickly, with instantaneous growth rate of wetweight 4.15 and that of dry weight (unshelled), 3.40. The annual production of theanimal calculated by instantaneous growth rate method was: wet weight 15771.9 mg穖-2穉-1;dry weight (unshelled), 862.4 mg穖-2. a-1. The corresponding annualP/B ratios were almost the same: 0.50, 0.51, respectively. Generaly, relationshipbetween wet weight (Ww, mg穖-2穉-1) and dry weight (Wd, mg穖-2穉-1) ofpreduction of Bellamya aeruginosa is expressed as: Ww = 17.20 Wd.
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Keywords:
- Snail /
- Bellamya aeruginosa /
- Production /
- P/B ratio /
- Lake Biandantang
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