Bombus atratus Franklin is a widely distributed bumblebee of South America. In Colombia, this species is recognized for its ability to adapt to highly disturbed habitats. However, knowledge of its ecology is poorly known, in particular conditions to ensure the long-term conservation of its populations. Identification of pollen resources is an important issue that could be used as a tool to manage and conserve bumblebees. In tropical areas, rainfall patterns could affect floral phenology and therefore the availability of pollen resources. Considering this, the present work aimed to establish the effect of extreme weather conditions (El Niño) in pollen availability, use of pollinic sources, and gyne production in B. atratus colonies. We reared and located 14 B. atratus colonies in a suburban area during a dry season (ENSO “El Niño”) and a rainy season (ENSO “La Niña”). We registered time to gyne production and numbers of gynes produced per colony. We extracted pollen samples to establish both its floral origin and its relative abundance. We measured floral offer for each season. The data of pollen use per colony were utilized to perform Bipartite networks. We analyzed the production of gynes and pollen use per season with correlation models and generalized linear models. Colonies of the rainy season produced more gynes and faster. The floral diversity and offer were higher during the rainy season. Successful colonies used specific pollen sources in two seasons, independently of the floral offer. Extreme dry season affected development of B. atratus colonies.

中文翻译：

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气候变化对高安第斯郊区情况下新热带大黄蜂熊熊的产后产量和花粉偏好的影响。

熊熊富兰克林是南美分布广泛的大黄蜂。在哥伦比亚，该物种因其适应高度受干扰的栖息地的能力而闻名。但是，关于其生态学的知识鲜为人知，特别是在确保长期保护其种群的条件下。花粉资源的鉴定是一个重要的问题，可以用作管理和保护大黄蜂的工具。在热带地区，降雨模式可能会影响花物物候，从而影响花粉资源的可用性。考虑到这一点，目前的工作旨在确定极端天气条件（厄尔尼诺）对花粉芽孢杆菌菌落中花粉可用性，花粉来源的利用和妇产的影响。我们饲养并找到了14 B. atratus干旱季节（ENSO“ ElNiño”）和雨季（ENSO“ LaNiña”）在郊区的殖民地。我们记录了产妇的时间和每个殖民地生产的妇产科的数量。我们提取了花粉样品以建立其花粉起源和相对丰度。我们测量了每个季节的花卉报价。每个菌落的花粉使用数据被用于进行二分网络。我们使用相关模型和广义线性模型分析了每个季节的地沟和花粉使用量。雨季的殖民地产生了更多的回旋和更快。在雨季，花卉的多样性和报价较高。成功的菌落在两个季节中使用了特定的花粉来源，而与花卉供应无关。极端干旱季节影响了牛缘芽孢杆菌菌落的发育。