Effects of land-use types and the exotic species,Hypochaeris radicata,on plant diversity in human-transformed landscapes of the biosphere reserve,Jeju Island,Korea

Land-use and plant invasion influence biodiversity.Understanding the effects of land-use types and invasive plants on the ecosystem is crucial for better management and the development of strategic plans for increasing biodiversity in Jeju Island,Korea,a designated Biosphere Reserve by the United Nations Education,Scientific,and Cultural Organization.The effect of the most dominant invasive exotic species,Hypochaeris radicata,on the four land-use types of Jeju Island was investigated.Plant composition,soil characteristics,and plant diversity among four land-use types(cropland,green space,neglected land,and residential)were compared.Among the land-use types,croplands had the most diverse plant composition and the highest richness in exotic and native plant species.Croplands,such as tangerine orchards,which are widely distributed throughout Jeju Island,showed the highest plant diversity because of medium intensity disturbance caused by weed removal.The relative cover of H.radicata did not differ between land-use types.However,H.radicata invasion was negatively related with plant species richness,making this invasive species a threat to the biodiversity of native herbs present in land-use areas.H.radicata adapts to areas with a broad range of soil properties and a variety of land-use types.Therefore,it is crucial to monitor land-use types and patterns of plant invasion to guide the implementation of consistent management and conservation strategies for maintaining ecosystem integrity of the transformed habitat in Jeju Island.

Early-diverging fungal phyla:taxonomy,species concept,ecology,distribution,anthropogenic impact,and novel phylogenetic proposals

The increasing number of new fungal species described from all over the world along with the use of genetics to define taxa,has dramatically changed the classification system of early-diverging fungi over the past several decades.The number of phyla established for non-Dikarya fungi has increased from 2 to 17.However,to date,both the classification and phylogeny of the basal fungi are still unresolved.In this article,we review the recent taxonomy of the basal fungi and re-evaluate the relationships among early-diverging lineages of fungal phyla.We also provide information on the ecology and distribu-tion in Mucoromycota and highlight the impact of chytrids on amphibian populations.Species concepts in Chytridiomycota,Aphelidiomycota,Rozellomycota,Neocallimastigomycota are discussed in this paper.To preserve the current application of the genus Nephridiophaga(Chytridiomycota:Nephridiophagales),a new type species,Nephridiophaga blattellae,is proposed.