Search for dissertations about: "species criteria"
Showing result 1 - 5 of 48 swedish dissertations containing the words species criteria.
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1. Integrative taxonomy of birds : Studies into the nature, origin and delimitation of species
Abstract : Species are the basic currency in biodiversity studies but what constitutes a species has long been controversial. A major breakthough was the insight that most systematists agree that species are segments of population lineages, and that multiple lines of evidence should be employed and integrated, a procedure called integrative taxonomy. READ MORE
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2. Functional and Modular As=C and P=C Group Motifs
Abstract : This work focuses on the design, synthesis, characterization, and application projections of low-coordinated heavy pnictogen-containing (described by the generic letter E, hence E=C) phosphaalkenes (P=C) and arsaalkenes (As=C), with emphasis on the E=C group motifs. The work aims to understand their functional and modular character, reactivity, and potential applications by stabilizing, isolating, and characterizing these species in low-coordination environments. READ MORE
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3. Atmospheric Species and Spectral Radiation in Terrestrial Exoplanets : Implications for Astrobiology
Abstract : The physical properties of the planets and their parent stars are fundamental in the composition of atmospheres and radiative environments, which fundamentally determine their surface temperature and habitability. The atmospheric composition and radiation play a vital role in the emergence of life. READ MORE
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4. Vegetation patterns and processes in riparian landscapes
Abstract : The objective of this study was to increase understanding of the processes structuring and controlling the species richness of riparian plant communities. In particular, I examined the unimodal relationship, found in many rivers, between plant species richness and location along the river corridor. READ MORE
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5. Controversies over taxonomic and nomenclatural instability: an empirical approach
Abstract : Taxonomic names serve two important functions: they reflect hypotheses about the existence of taxa, and they serve as the primary means to communicate about biodiversity. The dual purpose of names is a source of conflict and misunderstanding among taxonomists and end-users of taxonomy. READ MORE