Success in conserving biodiversity in rangelands depends on effectively managing the systems to achieve positive economic outcomes while preserving biodiversity. In the native grasslands of the Río de la Plata region, livestock production often falls below its potential due to low forage availability. Cattle management strategies that promote taller grass height can increase forage mass without replacing native vegetation, enhancing cattle dry matter intake and potentially boosting production. Nonetheless, the impact of such changes on grassland bird populations remains unclear. In this study, we implemented management changes to increase grass height across six ranches and evaluated the responses of grassland bird specialists. Initially, the average grass height was 6 cm, but after the management changes, it increased to an average of 12 cm. This also increased grass heterogeneity, which is desirable for supporting a higher richness of grassland birds. We found that both the abundances of individual grassland bird species and richness did not vary after the management changes. Moreover, threatened grassland bird species that rely strictly on taller grasses did not colonize the paddocks following the alterations. Therefore, we conclude that maintaining the abundance of seven grassland bird specialists and potentially increasing livestock production is feasible, as the attained grass height coincided with levels known to maximize cattle dry matter intake rate. However, achieved average grass height was not sufficiently tall to support endangered tall grass specialists. It is possible that longer time frames allow tussocks to grow taller and provide such habitat conditions. Most previous research on rangelands biodiversity has focused on assessing faunal responses in either ungrazed or heavily grazed areas. Therefore, our findings contribute to a better understanding of faunal responses within this spectrum and align with a win-win production-conservation approach, which can aid in safeguarding biodiversity across large geographic scales.

牧场生物多样性保护的成功取决于有效管理系统，以在保护生物多样性的同时取得积极的经济成果。在拉普拉塔河地区的原生草原，由于饲料供应不足，牲畜产量往往低于其潜力。促进更高草高的牛管理策略可以在不取代原生植被的情况下增加草料质量，从而提高牛干物质摄入量并有可能提高产量。尽管如此，这种变化对草原鸟类种群的影响仍不清楚。在这项研究中，我们实施了管理变革，以增加六个牧场的草高，并评估了草原鸟类专家的反应。最初，平均草高为6厘米，但管理变革后，平均草高增至12厘米。这也增加了草的异质性，这对于支持更高的草原鸟类丰富度是可取的。我们发现，管理变化后，草原鸟类个体的丰度和丰富度没有变化。此外，严格依赖较高草丛的受威胁草原鸟类在改造后并未在围场中定居。因此，我们的结论是，维持七种草原鸟类专家的丰富度并有可能增加牲畜产量是可行的，因为达到的草高与已知的最大化牛干物质摄入率的水平一致。然而，所达到的平均草高度不足以支持濒临灭绝的高草专家。较长的时间框架可能会让草丛长得更高并提供这样的栖息地条件。此前大多数关于牧场生物多样性的研究都集中在评估未放牧或重度放牧地区的动物反应。因此，我们的研究结果有助于更好地了解该范围内的动物反应，并与双赢的生产保护方法保持一致，这有助于保护大地理范围内的生物多样性。