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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 Europe.However,in the course of the last century,populations of the butterfly largely collapsed.Here,we surveyed patch and microhabitat occupancy and its drivers in one of the last vital populations in calcareous grasslands.Our study revealed that environmental conditions at the landscape and habitat level determined the occurrence of E.aurinia in a montane agricultural landscape with low land-use intensity.Patch occupancy increased with the cover of Devil's-bit Scabious(Succisa pratensis)grasslands in the surroundings of the patches,habitat heterogeneity and host-plant cover.Microhabitat occupancy was driven by a warm microclimate and high availability of host plants.In the well-connected landscape of nutrient-poor grasslands,patch occupancy of E.aurinia was driven by parameters defining a high habitat quality.Habitat heterogeneity very likely buffers E.aurinia populations against environmental stochasticity and,hence,enhances long-term viability.For the gregariously feeding caterpillars of E.aurinia,host-plant biomass is essential.Due to their more luxuriant growth,S.pratensis plants were clearly preferred,although the Glossy Scabious(Scabiosa lucida)was also widespread.Additionally,the growth of large Succisa plants was favored by soil humidity and grassland abandonment.To 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 oviposition.To secure long-term viability of E.aurinia 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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Enhanced aboveground biomass by increased precipitation in a central European grassland

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Ecological Processes 2018年第1期7卷 435-447页

作者： Md Lokman Hossain Carl Beierkuhnlein Department of Geography Hong Kong Baptist University15 Baptist University RoadKowloon TongHong Kong Global Change Ecology International Elite Study ProgrammeFaculty of BiologyChemistry and Earth SciencesUniversity of BayreuthUniversitätsstraße 3095440 BayreuthGermany Department of Environmental Protection Technology German University BangladeshGazipur 1702Bangladesh Department of Biogeography University of BayreuthUniversitätsstraße 3095440 BayreuthGermany

Background:Global climate change is projected to increase temperature and alter precipitation pattern,which could affect grassland ecosystem.Long-term observation at a field experiment can be a powerful approach to explore the impacts of climate change on biomass productivity in grassland.In attempting to understand how climatic variability regulates biomass productivity,we analyzed long-term records of temperature and precipitation to examine how variation of temperature and precipitation across 19 years affect biomass productivity.Methods:We established the experiment with 64 plots in two blocks and planted 31 species in 30 different mixtures.We harvested aboveground biomass twice a year,sorted biomass by functional groups,and weighed dry biomass.The site was mown after each harvest.We did not apply any fertilizer and water.Using linear regression model,we examined the influences of growing season temperature and precipitation on biomass productivity.Results:The results showed that aboveground biomass productivity in September and annual were significantly increased in post-drought(2003–2015).The relationships of aboveground biomass productivity with growing season precipitation were significantly positive.The results showed that aboveground biomass productivity in June and annual were sensitive to growing season temperature.The relationships of aboveground biomass productivity of the functional group of grasses with early growing season temperature were significantly negative.Early growing season precipitation had a significant positive effect on aboveground biomass productivity of the functional groups of grasses and legumes.Post-drought aboveground biomass productivity of the functional groups of grasses in June and September were declined,whereas legumes significantly increased,which suggests that the role of dominant grasses may shift by legumes with global climate change.Conclusions:Our results highlight that early and late growing temperature and precipitation variability may reduce the aboveground bioma

关键词： Aboveground biomass BIODEPTH experiment Climate change Functional groups Grassland biodiversity hay meadow Precipitation variability Temperate grassland Temperature variability

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