Per Johan Alström (born 9 April 1961) is a Swedish Professor of ornithology. He researches in taxonomy, systematics, and evolution, with birds in Asia as a specialty. Alström works at the Department of Ecology and Genetics (Animal Ecology) at Uppsala University and at the Swedish Species Information Centre at the Swedish University of Agricultural Sciences, Uppsala. He has previously worked as e.g. Curator of Ornithology at the Swedish Museum of Natural History, and been a guest researcher at the Percy Fitzpatrick Institute of African Ornithology, University of Cape Town and a Visiting Professor at the Chinese Academy of Sciences, Beijing. He is chairman of the Scientific Committee of the Swedish Taxonomy Initiative and the Committee for Swedish Animal Names and Swedish focal point for the Global Taxonomy Initiative under the Convention on Biological Diversity (CBD). Deputy Editor-in-Chief of the international ornithological journal Avian Research .
Professor is an academic rank at universities and other post-secondary education and research institutions in most countries. Literally, professor derives from Latin as a "person who professes" being usually an expert in arts or sciences, a teacher of the highest rank.
Ornithology is a branch of zoology that concerns the study of birds. Several aspects of ornithology differ from related disciplines, due partly to the high visibility and the aesthetic appeal of birds.
In biology, taxonomy is the science of defining and naming groups of biological organisms on the basis of shared characteristics. Organisms are grouped together into taxa and these groups are given a taxonomic rank; groups of a given rank can be aggregated to form a super-group of higher rank, thus creating a taxonomic hierarchy. The principal ranks in modern use are domain, kingdom, phylum, class, order, family, genus, and species. The Swedish botanist Carl Linnaeus is regarded as the founder of the current system of taxonomy, as he developed a system known as Linnaean taxonomy for categorizing organisms and binomial nomenclature for naming organisms.
The author name Alström is used for species scientifically described by Per Alström: Phylloscopus hainanus , Phylloscopus emeiensis , Phylloscopus calciatilis , Seicercus soror , Locustella chengi , Motacilla samveasnae , Zoothera salimalii .
In zoological nomenclature, author citation refers to listing the person who first makes a scientific name of a taxon available. This is done in a scientific publication while fulfilling the formal requirements under the International Code of Zoological Nomenclature, hereinafter termed "the Code". According to the Code, "the name of the author does not form part of the name of a taxon and its citation is optional, although customary and often advisable", however Recommendation 51A suggests: "The original author and date of a name should be cited at least once in each work dealing with the taxon denoted by that name. This is especially important in distinguishing between homonyms and in identifying species-group names which are not in their original combinations". For the purpose of information retrieval, the author citation and year appended to the scientific name, e.g. genus-species-author-year, genus-author-year, family-author-year, etc., is often considered a "de facto" unique identifier, although for a number of reasons discussed below, this usage may often be imperfect.
The Hainan leaf warbler is a species of Old World warbler in the family Phylloscopidae.
The Emei leaf warbler is a species of leaf warbler. It was formerly included in the "Old World warbler" assemblage.
