Sökning: "biological origin"
Visar resultat 1 - 5 av 421 avhandlingar innehållade orden biological origin.
1. On the origin of geometrid moths: the phylogenetic relationships and taxonomy
Sammanfattning : Geometrid moths represent one of the largest radiations of Lepidoptera. Phylogenetic analyses based on morphological and molecular data supports the monophyly of this group of moths. However, the subfamilial and tribal compositions of major groups are still unresolved, leading to unstable classifications. LÄS MER
2. Spatiotemporal Evolution of Neotropical Organisms: New Insights into an Old Riddle
Sammanfattning : Nowhere else on Earth are there so many species of plants and animals as in the Neotropical region. Yet, many questions remain concerning the causes underlying such outstanding diversification. LÄS MER
3. Integrative taxonomy of birds : Studies into the nature, origin and delimitation of species
Sammanfattning : 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. LÄS MER
4. Gastrotricha of Sweden - Biodiversity and Phylogeny
Sammanfattning : Gastrotricha are small aquatic invertebrates with approximately 770 known species. The group has a cosmopolitan distribution and is currently classified into two orders, Chaetonotida and Macrodasyida. The gastrotrich fauna of Sweden is poorly known: a couple of years ago only 29 species had been reported. LÄS MER
5. Transcriptional biomarkers of toxicity – powerful tools or random noise? : An applied perspective from studies on bivalves
Sammanfattning : Aquatic organisms are constantly at risk of being exposed to potentially harmful chemical compounds of natural or anthropogenic origin. Biological life can for instance respond to chemical stressors by changes in gene expression, and thus, certain gene transcripts can potentially function as biomarkers, i.e. LÄS MER
