Araucaria angustifolia is an anemophilous conifer native to Southern America threatened with extinction, with a noticeable decrease in its distribution area and seed production. To better understand the reproductive dynamics, the aerobiological curves obtained with Hirst methodology were analyzed during 7 years in San Antonio (Misiones, Argentina), including productivity, seasonality, start, end, duration, and peak, along with the role of meteorological/seasonal climate factors. An alternation between 1 year of high pollen values (1685 pollen grains day m−3, on average), followed by 2 years of a progressive reduction (456 pollen grains day m−3, on average) in productivity, was observed. This pattern was negatively related to temperature during the month preceding pollination; August minimum temperature yielded the best fit (correlation coefficient r = − 0.9, p < 0.01). In only 36 days, including October, 90% of the annual pollen was released. The daily pattern showed a curve with higher concentrations between hour 8 and hour 14. The daily maximum at hour 10 suggests pollen inputs from local sources. The eolic transport is limited due to the big size and weight of the grains and the unfavorable atmospheric conditions that prevail in this subtropical forest (high humidity and low wind speed). The average airborne pollen curve showed a peak during the second fortnight of October. Rain induced a noticeable reduction in pollen concentration modifying the shape of the aerobiological curve. Aerobiological analyses provide reliable information for the design of conservation strategies, such as ex situ planting and selective harvesting of seeds.

中文翻译：

---

阿根廷亚热带地区南洋杉空气中花粉的日、季节和年际变化

Araucaria angustifolia 是一种风寒针叶树，原产于南美洲，面临灭绝威胁，其分布面积和种子产量明显减少。为了更好地了解繁殖动态，我们对圣安东尼奥（阿根廷米西奥内斯）7 年来使用赫斯特方法获得的空气生物学曲线进行了分析，包括生产力、季节性、开始、结束、持续时间和峰值，以及气象/季节性的作用气候因素。观察到 1 年高花粉值（平均 1685 个花粉粒日 m-3）和随后 2 年生产力逐渐降低（平均 456 个花粉粒日 m-3）之间的交替。这种模式与授粉前一个月的温度呈负相关；八月最低温度产生了最佳拟合（相关系数 r = − 0.9，p < 0.01）。仅在 36 天内，包括 10 月，每年 90% 的花粉就被释放出来。每日模式显示出在第 8 小时和第 14 小时之间浓度较高的曲线。第 10 小时的每日最大值表明来自本地来源的花粉输入。由于谷物的大尺寸和重量以及该亚热带森林中普遍存在的不利大气条件（高湿度和低风速），风的运输受到限制。平均空气传播花粉曲线在 10 月的第二个两周出现峰值。降雨导致花粉浓度显着降低，从而改变了空气生物学曲线的形状。空气生物学分析为保护策略的设计提供可靠的信息，