Marius Filomeno Maurstad

• Helmerson, Cecilia; Weist, Peggy; Brieuc, Marine Servane Ono; Maurstad, Marius Filomeno; Schade, Franziska Maria & Dierking, Jan [Show all 14 contributors for this article] (2023). Evidence of hybridization between genetically distinct Baltic cod stocks during peak population abundance(s). Evolutionary Applications. ISSN 1752-4571. 16(7), p. 1359–1376. doi: 10.1111/eva.13575. Full text in Research Archive Show summary

  Range expansions can lead to increased contact of divergent populations, thus increasing the potential of hybridization events. Whether viable hybrids are produced will most likely depend on the level of genomic divergence and associated genomic incompatibilities between the different entities as well as environmental conditions. By taking advantage of historical Baltic cod (Gadus morhua) otolith samples combined with genotyping and whole genome sequencing, we here investigate the genetic impact of the increased spawning stock biomass of the eastern Baltic cod stock in the mid 1980s. The eastern Baltic cod is genetically highly differentiated from the adjacent western Baltic cod and locally adapted to the brackish environmental conditions in the deeper Eastern basins of the Baltic Sea unsuitable for its marine counterparts. Our genotyping results show an increased proportion of eastern Baltic cod in western Baltic areas (Mecklenburg Bay and Arkona Basin)—indicative of a range expansion westwards—during the peak population abundance in the 1980s. Additionally, we detect high frequencies of potential hybrids (including F1, F2 and backcrosses), verified by whole genome sequencing data for a subset of individuals. Analysis of mitochondrial genomes further indicates directional gene flow from eastern Baltic cod males to western Baltic cod females. Our findings unravel that increased overlap in distribution can promote hybridization between highly divergent populations and that the hybrids can be viable and survive under specific and favourable environmental conditions. However, the observed hybridization had seemingly no long-lasting impact on the continuous separation and genetic differentiation between the unique Baltic cod stocks.

• Pinninti, Likith Reddy; Maurstad, Marius Filomeno; Hoff, Siv Nam Khang; Kristensen, Torstein; Noble, Leslie Robert & Jentoft, Sissel [Show all 7 contributors for this article] (2023). The complete mitochondrial genome of the Atlantic spiny lumpsucker Eumicrotremus spinosus (Fabricius, 1776). Mitochondrial DNA Part B: Resources. ISSN 2380-2359. 8(3), p. 364–367. doi: 10.1080/23802359.2023.2184649. Full text in Research Archive
• Cerca, José; Maurstad, Marius Filomeno; Rochette, Nicolas C.; Rivera-Colón, Angel G.; Rayamajhi, Niraj & Catchen, Julian M. [Show all 7 contributors for this article] (2021). Removing the bad apples: A simple bioinformatic method to improve loci-recovery in de novo RADseq data for non-model organisms. Methods in Ecology and Evolution. ISSN 2041-210X. 12(5), p. 805–817. doi: 10.1111/2041-210X.13562. Full text in Research Archive

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• Hoff, Siv Nam Khang; Maurstad, Marius Filomeno; Alan, Le Moan; Ravinet, Mark; Durant, Joël & Tørresen, Ole K. [Show all 18 contributors for this article] (2023). Identification of multiple chromosomal inversions and fusions in a keystone Arctic species with high gene flow.
• Hoff, Siv Nam Khang; Maurstad, Marius Filomeno; Le Moan, Alan; Ravinet, Mark; Durant, Joël & Tørresen, Ole Kristian [Show all 18 contributors for this article] (2023). Identification of multiple chromosomal inversions and fusions in a keystone Arctic species with high gene flow.
• Maurstad, Marius Filomeno (2022). Identification of multiple chromosomal inversions in Arctic cod (Arctogadus glacialis) – and its putative implications for defining interspecies relationships. Universitetet i Oslo.
• Jones, Elizabeth Marie; Reigstad, Marit; Espinel, Nadjejda; Gjerland, Audun; Goraguer, Lucie Hélène Marie & Hodal, helene [Show all 15 contributors for this article] (2022). JC2-1 Joint cruise part 1 2021 : Cruise Report. Septentrio Academic Publishing. ISSN 2703-7525. Show summary

  The Nansen Legacy Joint Cruise 2, part 1 (JC2-1) 12-29 July 2021, continued the investigation of the interannual variability during the late summer season. At the same time will the cruise provide a late summer reference for the seasonal investigation that was separated to late summer and polar night 2019, and winter and spring 2021. The transect represents an environmental gradient going through the northern Barents Sea, and included 7 process stations (P1-P7) lasting 10-39 hrs. Additional CTD stations (NLEG) were taken between the process stations to increase the hydrographic resolution on the transect. The work started at 76°N at the open Atlantic Water dominated station P1, was sea ice covered from station P4 at 79 45.00 °N and included deep water stations at the P7 station at 82°N in the Nansen Basin. The program included measurements and sampling from the atmosphere, sea ice, ocean and sea floor. Data collected includes several disciplines to map the physical environment, the chemical characterization and biological communities. Key parameters from the Nansen Legacy joint cruises were selected and included in this reduced sampling program, compared to the other joint cruises. An important aim was to characterize the northern Barents Sea to map the interannual variability, but also to see how the proceeding winter and spring conditions has impacted the environment and conditions this year. A third task is to carry out a shelf investigation that can complement the investigations in the deep Arctic Basin starting in late August. Tests and improvements of a modified pelagic trawl (Harstad) were carried out as preparations for the Arctic Basin cruise in late August 2021.

• Renner, Angelika H.H.; Gradinger, Rolf; Altenburger, Andreas; Amdahl, Pernille; Barstein, Karoline & Duarte, Pedro [Show all 31 contributors for this article] (2022). JC3 Winter gaps cruise: Cruise Report . Septentrio Academic Publishing. ISSN 2703-7525. Show summary

  The Nansen Legacy (NL) JC3 cruise (19.02.-11.03.2022) aimed to fill regional, temporal and scientific gaps following the earlier NL cruises, in particular during the winter-to-spring transition and in the northern part of the NL transect to the Nansen Basin. Joint physical, chemical, and biological sampling and experiments for new technology addressed aims of RF1, RF2, RF3 and RA-C.

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