(Table 1) Time series of ostracod population density off Bokniseck shore ('Hausgarten'), western Baltic Sea@en

Seasonal distributions of ostracode species from the Bay of Kiel, western Baltic Sea (Bokniseck, 'Hausgarten') were studied at seven observation stations located between 6 - 23.5 m water depth. During the period from December 1973 to March 1975, 175 samples were taken every two weeks from the sediment surface at each station. Environmental factors were measured simultaneously with sampling. Most of the ostracode species were present in all of the samples throughout the year; four species were found to be seasonal. On the other hand, the population densities of each of the examined ostracode species, as revealed by countings, indicate marked seasonal variations. These variations are attributed to changes in length rate and timing of the reproductive cycles of the different ostracode species, effected mainly by food supply. Maxima in the abundance of the ostracode species with short (1/2 - 1 month) life cycles, occurred simultaneously with peaks of food supply in spring and autumn, whereas the maxima abundance of ostracodes with longer (10 - 12 months) life cycles was delayed.针对波罗的海西部基尔湾（Bay of Kiel）博克尼塞克（Bokniseck）“豪斯加滕（Hausgarten）”海域内7个水深6~23.5米的观测站位，开展了介形类（ostracode）物种季节分布特征的研究。研究时段为1973年12月至1975年3月，各站位每两周采集一次沉积物表层样品，累计获取175份样本；采样过程同步测定了环境因子。绝大多数介形类物种在全年所有样品中均有检出，仅4个物种呈现季节分布特征。另一方面，通过个体计数得到的各研究介形类物种的种群密度，均表现出显著的季节波动。此类波动归因于不同介形类物种生殖周期的时长与发生时机的变化，而该变化主要受食物供给影响。生命周期较短（1/2~1个月）的介形类物种，其丰度峰值与春、秋季的食物供给高峰同步出现；而生命周期较长（10~12个月）的介形类物种，其丰度峰值则出现延迟。