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Occurrence of an endangered grassland butterfly is mainly driven by habitat heterogeneity,food availability,and microclimate

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Insect Science 2022年第4期29卷 1211-1225页

作者： gwydion scherer Thomas Fartmann Department of Biodiversity and Landscape Ecology University of OsnabrückOsnabrückGermany Institute of Biodiversity and Landscape Ecology(IBL) MünsterGermany

The Marsh Fritillary(Euphydryas aurinia)was once widespread in large parts of Central ***,in the course of the last century,populations of the butterfly largely ***,we surveyed patch and microhabitat occupancy and its drivers in one of the last vital populations in calcareous *** study revealed that environmental conditions at the landscape and habitat level determined the occurrence of *** in a montane agricultural landscape with low land-use *** occupancy increased with the cover of Devil's-bit Scabious(Succisa pratensis)grasslands in the surroundings of the patches,habitat heterogeneity and host-plant *** occupancy was driven by a warm microclimate and high availability of host *** the well-connected landscape of nutrient-poor grasslands,patch occupancy of *** was driven by parameters defining a high habitat *** heterogeneity very likely buffers *** populations against environmental stochasticity and,hence,enhances long-term *** the gregariously feeding caterpillars of ***,host-plant biomass is *** to their more luxuriant growth,*** plants were clearly preferred,although the Glossy Scabious(Scabiosa lucida)was also ***,the growth of large Succisa plants was favored by soil humidity and grassland *** cope with the adverse macro-and mesoclimatic conditions of the study area,females of the butterfly selected host plants growing in extraordinarily warm microhabitats for *** secure long-term viability of *** populations,we recommend creating mosaics of traditionally managed grasslands and early stages of abandonment within the patches.

关键词： agricultural landscape calcarcous grassland hay meadow host-plant abundance land-use change traditional management

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