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The research gap between rangeland/livestock science and conservation biology/vegetation ecology has led to a lack of evidence needed for grazing‐related conservation management. Connecting scientific understanding with traditional ecological knowledge of local livestock keepers could help bridge this research and knowledge gap. We studied the grazing behaviour (plant selection and avoidance) of beef cattle (c. 33,000 bites) on species‐rich lowland pastures in Central Europe and traditional herding practices. We also did >450 outdoor interviews with traditional herders about livestock behaviour, herders' decisions to modify grazing behaviour and effects of modified grazing on pasture vegetation. We found that cattle grazing on species‐rich pastures displayed at least 10 different behavioural elements as they encountered 117 forage species from highly desired to rejected. The small discrimination error suggests that cattle recognize all listed plants ‘by species’. We also found that herders had broad knowledge of grazing desire and they consciously aimed to modify desire by slowing, stopping or redirecting the herd. Modifications were aimed at increasing grazing intensity in less‐desired patches and decreasing grazing selectivity in heterogenous swards. Synthesis and applications. The traditional herd management practices presented here have significant conservation benefits, such as avoiding under‐ and overgrazing, and targeted removal of pasture weeds, litter and encroaching bushes, tall competitive plants and invasive species. We argue that knowledge co‐production with traditional herders who belong to another knowledge system could help connect isolated scientific disciplines especially if ecologists and rangeland scientists work closely with traditional herders, co‐designing research projects and working together in data collection, analysis and interpretation. Stronger links between these disciplines could help develop evidence‐based, specific conservation management practices while herders could contribute with their practical experiences and with real‐world testing of new management techniques.

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High nature-value grasslands including mountain hay meadows are among the most species-rich habitats in Europe. Mountain hay meadows were developed and maintained by traditional, small-scale management systems having high micro-scale land-use diversity (MSLUD), i.e. the parcel-scale diversity of management elements which usually depend on individual decisions and family traditions of local farmers. Detailed studies documenting the effects of micro-scale land-use diversity on vegetation are absent. The main objectives of our study were to analyse the effect of micro-scale land-use diversity and evenness on local plant diversity and cover of the main plant functional types. Field work was carried out in the Gyimes region (Eastern Carpathians, Romania). We conducted semi-structured interviews with the owners and managers of the studied meadow parcels in order to reveal the number of applied management elements (Nm) and applied frequencies of these management elements (e.g. manuring, mowing, seed sowing and weed control) per parcel and to determine the three differently used hay meadow types from interviews. For quantifying MSLUD, the Shannon diversity formula was used, in the case of micro-scale land-use evenness (MSLUE), the original Pielou's evenness formula was applied. To document parcel-scale vegetation features, 4x4-meter quadrats were surveyed in every parcel. We found significant differences in the Nm, MSLUD and MSLUE among the three management types. In models where MSLUD, MSLUE and Nm were built in, we got better model fits and more parsimonious models than in cases where just management type was built into the models. Management elements (manuring, seed sowing) also had a significant effect on vegetation. Our results highlight that micro-scale land-use diversity plays a significant role in the maintenance of plant diversity in traditional, small-scale farming systems. The main drivers behind the high micro-scale land-use diversity may be farmers' personal decisions and family traditions. We argue that for an adequate ecological understanding and conservation of these traditional, small-scale land-use systems, the development of adequate ways of evaluation as well as detailed studies of the effects of several different management elements and land-use diversity on vegetation are needed.