Herman P M J, Heip C, Vranken G
Marine Biology Section, Zoology Institute, State University of Ghent, Belgium.
Oecologia. 1983 Jun;58(3):326-331. doi: 10.1007/BF00385231.
The ostracod Cyprideis torosa Jones, 1850 is a dominant species in the meiofauna of brackish water habitats. Its production in the field over a five-year period has been calculated using two production models. The first model uses the age-distribution of shells preserved in the sediment to assess the stage-specific mortality rates and the stage durations. The second model is the size-frequency model, modified for use with developmental stages instead of size-classes. Productions calculated with both methods agree very well. Their values are 9.7 and 9.2 g dwt·m·y respectively. The yearly P/B-ratio is 2.7 or 2.6 y, production efficiency P/A is 0.38 or 0.37.The production efficiency of Cyprideis torosa nearly equals the mean efficiency of non-insect invertebrate detritivores. The species' conservative strategy and long generation time enables it to maintain a relatively high biomass with a fixed amount of food. These characteristics make it a superior competitor.
1850年命名的 Torosa 土菱介（Cyprideis torosa Jones）是咸淡水生境小型底栖动物中的优势物种。已使用两种生产模型计算了其在五年时间里的野外产量。第一种模型利用保存在沉积物中的壳体年龄分布来评估特定阶段的死亡率和阶段持续时间。第二种模型是大小频率模型，经过修改后用于发育阶段而非大小等级。用这两种方法计算出的产量非常吻合。其数值分别为9.7和9.2克干重·平方米·年。年P/B比为2.7或2.6年，生产效率P/A为0.38或0.37。Torosa土菱介的生产效率几乎等于非昆虫无脊椎碎屑食性动物的平均效率。该物种的保守策略和较长的世代时间使其能够在固定食物量的情况下维持相对较高的生物量。这些特征使其成为一个优势竞争者。
