Insect pollination is essential for the maintenance of ecosystems and for agricultural productivity. Bees are the main pollinator group and their assemblages are threatened by agricultural intensification. This study aimed to compare the diversity and structuring of bee assemblages between organic and conventional agroecosystems and to evaluate the influence of landscape composition on bee abundance in the Pampa biome. The study was carried out on three organic and three conventional family farms. Sampling was performed during the summer using pan traps. Four sampling units were placed on each farm, of which three were placed in crop field areas and one in native forest remnants. The diversity profile showed no significant difference between agroecosystems. Species abundance distribution indicates fewer dominant species in the organic system, suggesting the positive influence of polyculture on assemblage structure. Bee composition was different between agroecosystems. Notably, the species composition of bees in the forest edge of conventional farms was quite similar to that found in the organic habitats, indicating the importance of forested environments as a refuge for bees in conventional systems. The landscape analysis showed that the increase in the proportion of crop field areas negatively influenced the abundance of bees. We suggest that the maintenance of a heterogeneous agricultural landscape and smallholdings, composed of native and semi-natural habitats and organic practices on family farms can help to provide diverse niches for wild bees in the Pampa, contributing to biodiversity conservation and supporting ecosystem processes, like pollination.

昆虫授粉对于维持生态系统和提高农业生产力至关重要。蜜蜂是主要的传粉者群体，它们的群体受到农业集约化的威胁。本研究旨在比较有机和常规农业生态系统之间蜜蜂组合的多样性和结构，并评估景观构成对潘帕生物群落中蜜蜂丰度的影响。该研究在三个有机家庭农场和三个传统家庭农场中进行。夏季使用盘式捕集器进行采样。每个农场放置了四个采样单元，其中三个放置在农田区域，一个放置在原始森林遗迹中。多样性概况显示农业生态系统之间没有显着差异。物种丰度分布表明有机系统中的优势物种较少，表明混养对组合结构的积极影响。农业生态系统之间的蜜蜂组成不同。值得注意的是，传统农场森林边缘蜜蜂的物种组成与有机栖息地中的蜜蜂物种组成非常相似，这表明森林环境作为传统系统中蜜蜂避难所的重要性。景观分析表明，农田面积比例的增加对蜜蜂的数量产生了负面影响。我们建议维护由本地和半自然栖息地以及家庭农场的有机实践组成的异质农业景观和小农，有助于为潘帕的野生蜜蜂提供多样化的生态位，有助于生物多样性保护和支持生态系统过程，例如授粉。