| Summary: | The papers of this thesis are not available in Munin: 1. Aarbakke, O. N. S., Bucklin, A., Halsband, C. and Norrbin, F.: 'Discovery of Pseudocalanus moultoni Frost 1989 in Northeast Atlantic waters based on mitochondrial COI sequence variation', Journal of Plankton Research (2011), vol. 33(10):1487-1495, availble at http://dx.doi.org/10.1093/plankt/fbr057 2. Aarbakke, O. N. S., Weydmann, A. and Fevolden, S-E.: 'Pseudocalanus (Copepoda: Calanoida) species distribution and relative abundance as indicators of changing sea temperature. Submitted to Journal of Plankton Research' (manuscript) 3. Aarbakke, O., Bucklin, A., Halsband, C. and Norrbin, F.: 'Comparative phylogeography and demographic history of five sibling copepod species in the North Atlantic Ocean' (manuscript) The seven species of the genus Pseudocalanus (Copepoda: Calanoida) are difficult to identify because of very small interspecific, and comparatively large intraspecific, divergence of morphologic and morphometric traits. Thus, despite the fact that Pseudocalanus spp. are among the most abundant metazoans in the world, our knowledge of them at the species level is limited. The main objective of this thesis was to lay the groundwork for future studies of Pseudocalanus spp. in the Northeast Atlantic Ocean and Euro-Arctic by determining which species are present. Through a combined DNA barcoding and traditional identification approach, this work reveals the presence of at least four species of Pseudocalanus, one of which was previously not believed to occur in the East Atlantic Ocean. Furthermore, the thesis reveals differences in environmental preferences and distributions of Pseudocalanus elongatus, P. minutus, P. moultoni and P. acuspes in the Northeast Atlantic Ocean and Euro-Arctic, and discusses implications of these differences in relation to rising sea temperatures. Finally, this work examines the phylogeography and demographic history of Pseudocalanus minutus, P. moultoni, P. elongatus, P. acuspes and P. newmani in the North Atlantic Ocean and based on these results suggests an evolutionary hypothesis for the divergence of Pseudocalanus spp. into one oceanic and one coastal clade. Hopefully, this thesis has achieved its main goal of providing a basis from which the biology and ecology of these fascinating copepod species can be further explored.
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