ABSTRACT

Birds are good indicators of ecosystem health. Monitoring populations can provide useful information to inform conservation action. Kaipatiki, Auckland, contains approximately 450 ha of indigenous forest, scrub and wetland ecosystems. Pest-controlled reserves are important for supporting avian biodiversity, however, this has not been measured extensively over time across Kaipatiki. An established method to measure changes in avian biodiversity and numbers over time is using stationary point-counts. Using this method, bird counts were conducted in 19 reserves during three consecutive breeding season periods (2016–2018). We also conducted correlative analyses on mammalian predator and bird abundance within Kaipatiki to examine these relationships. Mixed modelling statistical analyses suggested significantly higher numbers of individual birds of all detected species in 2018 than both 2016 and 2017. Tūī, silvereye, grey warbler and fantail were the most common native species observed. Further, rat relative abundance had a significant negative relationship with bird abundance. Ongoing bird counts across Kaipatiki will help provide robust long-term data allowing reliable analyses of population trends and avian species dynamics. These data should be subjected to correlative analyses alongside mammalian predator control data in each reserve. This will enable us to gauge predator control effectiveness in terms of native bird number changes.

摘要

鸟类是生态系统健康的良好指标。监测种群可以为保护行动提供有用的信息。奥克兰的凯帕蒂基拥有大约 450 公顷的原生森林、灌木丛和湿地生态系统。害虫控制的保护区对于支持鸟类生物多样性很重要，但是，随着时间的推移，凯帕蒂基的这一点尚未得到广泛测量。测量鸟类生物多样性和数量随时间变化的既定方法是使用固定点计数。使用这种方法，在连续三个繁殖季节期间（2016-2018 年）对 19 个保护区进行了鸟类计数。我们还对 Kaipatiki 内的哺乳动物捕食者和鸟类丰度进行了相关分析，以检查这些关系。混合建模统计分析表明，2018 年检测到的所有物种的个体鸟类数量明显高于 2016 年和 2017 年。 Tūī、银莺、灰莺和扇尾是观察到的最常见的本地物种。此外，大鼠相对丰度与鸟类丰度呈显着负相关。Kaipatiki 的持续鸟类数量将有助于提供可靠的长期数据，从而对种群趋势和鸟类物种动态进行可靠分析。这些数据应与每个保护区的哺乳动物捕食者控制数据一起进行相关分析。这将使我们能够根据本地鸟类数量的变化来衡量捕食者控制的有效性。大鼠相对丰度与鸟类丰度呈显着负相关。Kaipatiki 的持续鸟类数量将有助于提供可靠的长期数据，从而对种群趋势和鸟类物种动态进行可靠分析。这些数据应与每个保护区的哺乳动物捕食者控制数据一起进行相关分析。这将使我们能够根据本地鸟类数量的变化来衡量捕食者控制的有效性。大鼠相对丰度与鸟类丰度呈显着负相关。Kaipatiki 的持续鸟类数量将有助于提供可靠的长期数据，从而对种群趋势和鸟类物种动态进行可靠分析。这些数据应与每个保护区的哺乳动物捕食者控制数据一起进行相关分析。这将使我们能够根据本地鸟类数量的变化来衡量捕食者控制的有效性。