Floodplain forests with regular flooding regimes are the largest natural retentions areas in Croatia and are important as natural habitats for ungulates. The aim of this study was to determine the scale of mortality caused by flooding within these forests. Over a 10-year period, data on ungulate mortality (red deer, roe deer and wild boar), flood duration and flooded surface area were recorded. The study was conducted in primary (Posavske Šume—RET I) and secondary (Opeke II—RET II) retention areas within Lonjsko Polje Nature Park (Sava River region, Croatia). The longest flood period and the largest flooded surface area were recorded in RET I. Total ungulate mortality was 749 individuals, with 482 individuals in RET I and 267 individuals in RET II, predominantly wild boar. Flood mortality did not differ by gender. The highest mortality of wild boar was recorded for the juvenile and yearling age classes. Low mortality of red and roe deer can be attributed to their body size and ecological niches. Differences in mortality between the primary and secondary retention areas corresponded to differences in flood regimes, flood column heights and micro relief structures. In both retention areas, wild boar mortality and flood duration, i.e. flooded surface area, were positively correlated. Because the growth rate of the analysed ungulate populations was higher than the recorded mortality, no long-term effect of floods is expected on species abundance in these areas.

具有常规洪水制度的洪泛区森林是克罗地亚最大的自然保留区，并且是有蹄类动物的自然栖息地。这项研究的目的是确定由这些森林中的洪水造成的死亡率规模。在10年中，记录了有蹄类动物死亡率（马鹿，ro和野猪），洪水持续时间和洪水面积的数据。该研究在Lonjsko Polje自然公园（克罗地亚萨瓦河地区）内的主要（PosavskeŠume-RETI）和次要（Opeke II-RET II）保留区中进行。RET I中记录了最长的洪水时期和最大的洪水面积。有蹄类动物的总有蹄类死亡率为749人，RET I中为482人，RET II中为267人，主要是野猪。洪水死亡率没有性别差异。少年和一岁年龄组的野猪死亡率最高。马和er的低死亡率可归因于它们的体型和生态位。主要保留区和次要保留区之间的死亡率差异对应于洪水制度，洪水柱高和微型起伏结构的差异。在两个保留区中，野猪死亡率和洪水持续时间（即洪水面积）呈正相关。因为分析的有蹄类动物种群的增长率高于记录的死亡率，所以预计洪水对这些地区物种的丰富度不会产生长期影响。主要保留区和次要保留区之间的死亡率差异对应于洪水制度，洪水柱高和微型起伏结构的差异。在两个保留区中，野猪死亡率和洪水持续时间（即洪水面积）呈正相关。因为分析的有蹄类动物种群的增长率高于记录的死亡率，所以预计洪水对这些地区物种的丰富度不会产生长期影响。主要保留区和次要保留区之间的死亡率差异对应于洪水制度，洪水柱高和微型起伏结构的差异。在两个保留区中，野猪死亡率和洪水持续时间（即洪水面积）呈正相关。因为分析的有蹄类动物种群的增长率高于记录的死亡率，所以预计洪水对这些地区物种的丰富度不会产生长期影响。