Data collected on zooplankton community composition over longer time periods (> 10 years) are rare. We examined among-lake spatial and temporal trends of zooplankton communities from a monitoring programme undertaken in the Waikato region, New Zealand. A total of 39 lakes were sampled over a period of 12 years, between 2007 and 2019, with varying degrees of temporal effort. We focussed particularly on eight lakes, considered here as ‘long-term lakes’, where samples were collected with greater regularity (including 5 with 12 years of data). Among lakes, suspended sediment concentrations and indicators of lake trophic state were inferred to be important in determining the zooplankton distributions; as this region is dominated by shallow lakes, the relative importance of suspended sediments was high. Among the long-term lakes, the greatest dissimilarities in zooplankton community composition among years were in Lake Waahi, where the Australian Boeckella symmetrica was first detected in 2012. That is, the greatest temporal changes to zooplankton composition during the study period were due to the invasion by non-indigenous species, rather than changes in trophic state or other environmental variables; non-native species commonly dominated the individual counts of species through much of 2014 and 2015, with most samples since 2016 being again dominated by native species. Following this lake, the largest and shallowest lakes in the dataset—Whangape and Waikare—exhibited the greatest variability in community composition among years.

在较长时期（> 10年）内收集的有关浮游动物群落组成的数据很少。我们通过在新西兰怀卡托地区实施的一项监测计划，研究了浮游动物群落的湖间时空趋势。在2007年至2019年之间的12年中，总共采样了39个湖泊，并且付出了不同程度的时间努力。我们特别关注了八个湖泊，在这里被称为“长期湖泊”，在那里采样的规律性更高（包括5个具有12年数据的样本）。在湖泊之间，悬浮的泥沙浓度和湖泊的营养状态指标被认为对确定浮游动物的分布很重要。由于该地区以浅湖为主，因此悬浮沉积物的相对重要性很高。在长期的湖泊中，对称性博克氏菌是在2012年首次发现的。也就是说，在研究期间浮游动物组成的最大时间变化是由于非本地物种的入侵，而不是营养状态或其他环境变量的变化。在2014年和2015年的大部分时间里，非本地物种通常在物种个体数量中占主导地位，自2016年以来，大多数样本再次由本地物种占据主导地位。继该湖泊之后，数据集中最大，最浅的湖泊（旺阿佩和怀卡雷）在几年中的群落组成变化最大。