Food-limited reproduction and growth of three copepod species in the low-salinity zone of the San Francisco Estuary
Food-limited reproduction and growth of three copepod species in the low-salinity zone of the San Francisco Estuary
复制标题
旧金山河口低盐区三种桡足类物种的食物限制繁殖和生长
DOI：
10.1093/plankt/fbt128
复制
发表时间：
2014
影响因子：
2.1
通讯作者：
A. Gould
中科院分区：
文献类型：
--
作者：
W. Kimmerer;Toni R. Ignoffo;Anne;A. Gould
2006年和2007年春夏，我们测定了三种常见桡足类在低盐度区的旧金山弗朗西斯科河口的繁殖和生长率。价格很低，尤其是在夏季。慈宽尾姬蜂春季产卵率平均为~3卵/雌-1 d-1或0.04 d-1，而福布斯拟镖水蚤夏季产卵率平均为~1卵/雌-1 d-1或0.02 d-1。E.桡足类的比生长率适中。福寿螺在夏季的日活动量较低（分别为0.15和0.03天-1）。这两个物种的生长和产蛋率普遍低于从温度预测的速度喂养良好的桡足类，这表明慢性食物限制。以前发表的估计小剑水蚤四棘湖石首鱼也很低。任何物种的生长的措施都与浮游植物生物量，初级生产或丰富的物种，也没有不同的2年，尽管水文差异很大。要了解丰富的模式，需要调查不同的死亡率。
We determined reproductive and growth rates of three common copepods in the low-salinity zone of the San Francisco Estuary during spring-summer of 2006 and 2007. Rates were low, particularly during summer. The egg production rate of Eurytemora affinis in spring averaged ~3 eggs female -1 day -1 or 0.04 day -1 , while that of Pseudodiaptomus forbesi in summer averaged ~1 egg female -1 day -1 or 0.02 day -1 . Specific growth rates of copepodites were moderate for E. affinis in spring (0.23 and 0.15 day -1 for early and late stages, respectively) and low for P. forbesi in summer (0.15 and 0.03 day -1 , respectively). Growth and egg production rates of both species were generally lower than rates predicted from temperature for well-fed copepods, suggesting chronic food limitation. Previously published estimates for the small cyclopoid Limnoithona tetraspina were also low. None of the measures of growth of any species was related to phytoplankton biomass, primary production or abundance of the species, nor did they differ between the 2 years despite large differences in hydrology. To understand patterns of abundance will require investigation of differential mortality rates.