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In the stem-derivational perfective-imperfective opposition of Slavic the role of prefixes and suffixes has to be assessed jointly. The article evaluates the diachronic backdrop and parameters appropriate for classificatory categories. Special attention is paid to the criteria applied by aspectologists to determine aspect pairs and to aspect triplets. The assessment ends up with a paradox resulting from Maslov's criteria of 'trivial pairednessʼ, which require not only identical lexical meaning, but an ontology for which telic events are the sole basis in the derivation of aspect pairs.
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Dear Colleagues, Zoological institutions contribute a large amount of fundamental and applied knowledge on a diverse array of animal species. Despite this significant contribution, research conducted within zoos or other captive wildlife facilities has historically been skewed toward charismatic mammals, which comprise only a small proportion of the species that are held in captive collections. Modern zoos play an important role in animal welfare, conservation, and environmental education; therefore, this shortfall in knowledge may have large, unseen, and negative impacts on these "forgotten species". Hypothesis-driven, experimental research plays a key role in filling these knowledge gaps; however, other avenues of data collection exist which may be equally important. These include observational data (collected without experimental interventions), operational data (data collected within the general management activities of a facility), and incidental data (data collected for one purpose which may reveal further important information when explored in more detail). These unpublished datasets may provide fundamental information on species for which comparatively little is known.
Animal species. --- Animals --- Species --- Classification
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Species. --- Zoology --- Variation.
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The book includes collection of theoretical papers dealing with the species problem, which is among most fundamental issues in biology. The principal topics are: consideration of the species problem from the standpoint of modern non-classical science paradigm, with emphasis on its conceptual status presuming its analysis within certain conceptual framework; evolutionary emergence of the species as discrete unit of certain level of generality; epistemological consideration of the species as a particular explanatory hypotheses, with respective revised concepts of biodiversity and conservation; considerations of evolutionary and phylogenomic species concepts as candidates for the universal one; re-appraisal of the biological species concept based on the "friend-foe" recognition system; species delimitation approach using multi-locus coalescent-based method; a re-consideration of the Darwin's species concept.
Species. --- Species --- Philosophy. --- Speciation (Biology) --- Biology --- Genetics --- Hybridization --- Organisms --- Biogeography
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Animals --- Plants --- Endangered species --- Animals. --- Endangered species. --- Plants. --- Alberta.
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Species diversity --- Biogeography --- Biodiversity --- Biodiversity. --- Biogeography. --- Species diversity.
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