Fritz Robert S, Morse Douglass H
Department of Biology, Vassar College, 12601, Poughkeepsie, NY, USA.
Division of Biology and Medicine, Brown University, 02912, Providence, RI, USA.
Oecologia. 1985 Jan;65(2):194-200. doi: 10.1007/BF00379217.
Reproductive success and growth rate data were collected for individually marked crab spiders Misumena vatia (Clerck) in 1980, 1981, and 1982. All measures of reproductive success were found to be quite variable between individuals within years, but did not differ between years. Reproductive effort (mass of clutch/prereproductive mass of female) was the least variable measurement and was not correlated with female weight at reproduction. Clutch weight and number of eggs per clutch were highly correlated with female reproductive weight. Egg weight was not correlated with the number of eggs per clutch. Hatching success did not vary with clutch size and averaged 94.5%. Growth rates of spiders were highly variable, indicating large variation in feeding rate. In 1981 and 1982, approximately 20% of female spiders were unable to capture enough prey to grow and reproduce. Primary prey species differed in weight and in their contribution to spider egg production. Spiders attacked a larger percentage of bumblebees but captured a larger percentage of honeybees. There was no simple relationship between diet choice and reproductive success. Spiders which selected suboptimal umbels to forage on some or all of the time, however, had significantly lower reproductive success than spiders choosing the best umbels.
1980年、1981年和1982年，研究人员收集了单独标记的蟹蛛（Misumena vatia (Clerck)）的繁殖成功率和生长率数据。结果发现，所有繁殖成功率的衡量指标在同一年的个体之间差异很大，但在不同年份之间没有差异。繁殖投入（卵块质量/雌性繁殖前质量）是变化最小的测量指标，且与繁殖时的雌性体重无关。卵块重量和每个卵块的卵数与雌性繁殖体重高度相关。卵重与每个卵块的卵数无关。孵化成功率不随卵块大小变化，平均为94.5%。蜘蛛的生长率差异很大，表明摄食率变化很大。在1981年和1982年，约20%的雌性蜘蛛无法捕获足够的猎物来生长和繁殖。主要猎物种类在体重和对蜘蛛产卵的贡献方面存在差异。蜘蛛攻击大黄蜂的比例较高，但捕获蜜蜂的比例较高。饮食选择与繁殖成功率之间没有简单的关系。然而，那些部分或全部时间选择次优伞形花序觅食的蜘蛛，其繁殖成功率明显低于选择最佳伞形花序的蜘蛛。
