Identifying factors that influence human-wildlife conflicts is essential to the management of these interactions. Polar bears (Ursus maritimus) come into conflict with humans and these conflicts may become more frequent as the bears spend more time on land due to climate warming induced sea ice loss. To reduce human-bear conflicts, polar bears near Churchill, Manitoba, Canada, are deterred from human areas or caught, held temporarily, and relocated by wildlife officials. We evaluated data for 2061 bear captures intended to reduce human-bear conflicts from 1970-2018 to understand temporal dynamics relative to population trends and sea ice indices. On average, 42 different conflict bears/year (SE = 3.6, range = 3 to 110) were handled. The number of conflict bears increased up to a 2001 breakpoint with no trend afterwards. The proportion of conflict bears relative to the population size increased until a breakpoint in 1998 with no trend afterwards. The mean age of conflict bears was 5.5 years (SE = 0.01, range = 1 to 31) and increased over time from 2.6 in 1970 to 6.7 in 2018. Pooling years, subadults were the most common group in conflict and comprised 55% of the bears handled. Age/sex class composition varied significantly before and after the 2001 breakpoint, with subadults comprising a lower proportion of conflict bears after the breakpoint. We found different temporal trends in the number of bears caught in each age/sex class, as well as the entire population, suggesting that multiple factors were involved. The number of conflict bears increased with the length of the ice-free period and there was a positive interaction between abundance and year on the number of conflict bears, indicating that when abundance was higher, the effect of year was higher. Observed changes may be associated with increasing effects of climate change on body condition, longer on-land periods, altered migration routes, altered summering habitat, and food-seeking behaviour. Definitive explanations for the patterns, however, are challenged by shifts in management activities.

识别影响人与野生动物冲突的因素对于管理这些互动至关重要。北极熊（熊））与人类发生冲突，随着熊熊由于气候变暖导致海冰流失而在土地上花费更多的时间，这些冲突可能会更加频繁。为了减少人与动物之间的冲突，加拿大马尼托巴省丘吉尔附近的北极熊被从人类地区阻遏或捕获，暂时关押并由野生动植物官员转移。我们评估了旨在减少1970-2018年人与熊之间的冲突的2061头熊捕获的数据，以了解与人口趋势和海冰指数相关的时间动态。平均每年处理42种不同的冲突熊（SE = 3.6，范围= 3至110）。冲突熊的数量增加到2001年的断点，此后没有任何趋势。冲突熊相对于人口规模的比例一直增加，直到1998年达到断点，此后没有任何趋势。冲突熊的平均年龄为5岁。5年（SE = 0.01，范围= 1到31），并随着时间的推移从1970年的2.6增加到2018年的6.7。合并年份中，亚成人是冲突中最常见的群体，占所处理熊的55％。在2001年断点之前和之后，年龄/性别类别构成发生了显着变化，在断点之后，亚成人中冲突熊的比例较低。我们发现每个年龄/性别类别的熊数量以及整个种群的时间变化趋势不同，表明涉及多个因素。随着无冰期的延长，冲突熊的数量增加，丰度和年份之间的冲突熊数量呈正相关关系，这表明当丰度越高时，年份的影响就越大。观察到的变化可能与气候变化对身体状况，陆上时间更长，迁徙路线改变，夏季栖息地改变以及觅食行为的影响增加有关。但是，有关模式的明确解释受到管理活动转变的挑战。