Thaise Ricardo de Freitas

• Ricardo de Freitas, Thaise; Hess, Silvia; Renaud, Paul Eric; Appleby, Peter & Alve, Elisabeth (2024). Drivers of organic carbon distribution and accumulation in the northern Barents Sea. Progress in Oceanography. ISSN 0079-6611. doi: 10.1016/j.pocean.2024.103286.
• Kohler, Stephen Gustav; Kull, Laura M.; Heimbürger-Boavida, Lars-Eric; Ricardo de Freitas, Thaise; Sanchez, Nicolas & Ndungu, Kuria [Show all 7 contributors for this article] (2022). Distribution pattern of mercury in northern Barents Sea and Eurasian Basin surface sediment. Marine Pollution Bulletin. ISSN 0025-326X. 185. doi: 10.1016/j.marpolbul.2022.114272. Full text in Research Archive
• Santana, Beatriz; Ricardo de Freitas, Thaise; Leonel, Juliana & Bonetti, Carla (2021). Biometric and biomass analysis of Quaternary Uvigerinidae (Foraminifera) from the Southern Brazilian continental slope. Marine Micropaleontology. ISSN 0377-8398. 169. doi: 10.1016/j.marmicro.2021.102041.
• Ricardo de Freitas, Thaise; Bacalhau, Eduardo & Disaró, Sibelle (2021). Biovolume Method for Foraminiferal Biomass Assessment: Evaluation of Geometric Models and Incorporation of Species Mean Cell Occupancy. Journal of Foraminiferal Research. ISSN 0096-1191. 51(4), p. 249–266. doi: 10.2113/GSJFR.51.4.249.
• Cox, Kieran; Black, Morgan; Filip, Natalia; Miller, Matthew; Mohns, Kayla & Mortimor, James [Show all 11 contributors for this article] (2017). Community assessment techniques and the implications for rarefaction and extrapolation with Hill numbers. Ecology and Evolution. ISSN 2045-7758. doi: 10.1002/ece3.3580.

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• Fransson, Agneta; Bluhm, Bodil Annikki Ulla Barbro; Kohlbach, Doreen; Assmy, Philipp Kurt Wolf; Bratbak, Gunnar & Amargant, Marti [Show all 36 contributors for this article] (2024). Nansen vs. Amundsen Basin: Constrasting physico-chemical properties and biota composition to inform management.
• Ziegler, Amanda; Jørgensen, Lis Lindal; Bluhm, Bodil Annikki Ulla Barbro; Giebichenstein, Julia; Borgå, Katrine & Ricardo de Freitas, Thaise (2023). The effect of ice-free summer conditions on benthic food web structure in the Barents Sea. Show summary

  Reduced Arctic sea-ice cover has been shown to alter phytoplankton community composition and reduce the magnitude of vertical flux, thereby reducing the strength of pelagic-benthic coupling. It is predicted that Arctic shelf ecosystems, like the Barents Sea, will transition into sub-polar-like ecosystems under future climatic conditions. However, few studies have provided a benthic perspective to the question of how ice-free conditions in the Arctic will affect food web structure. In this study, we aim to test whether ice-free summer conditions in the Barents Sea and adjacent Nansen Basin alter benthic food web structure and the strength of pelagic benthic coupling. To do so, we used bulk stable isotopes of carbon and nitrogen measured in food sources and benthic consumers, demersal fish, and zooplankton collected during summers with contrasting sea-ice conditions: August 2018 – low sea-ice extent and August 2019 – high sea-ice extent. We compared benthic food web structure across three oceanographically distinct regions from the sea-ice free central Barents Sea shelf and the seasonally ice-free northern Barents Sea shelf to the slope extending into the Nansen Basin. The results of this work will not only improve our understanding of the impact that Arctic sea-ice loss has on benthic communities but provide additional insight to the resiliency of Arctic benthic food webs.

• Ricardo de Freitas, Thaise; Hess, Silvia; Renaud, Paul Eric & Alve, Elisabeth (2023). Spatio-temporal distribution patterns of benthic foraminifera in the northern Barents Sea.
• Ricardo de Freitas, Thaise; Hess, Silvia; Renaud, Paul Eric & Alve, Elisabeth (2022). Benthic foraminiferal biodiversity in the northern Barents Sea: preliminary results.
• Ricardo de Freitas, Thaise; Hess, Silvia; Renaud, Paul Eric & Alve, Elisabeth (2022). Seasonal variability on living benthic foraminiferal biodiversity in the northern Barents Sea: preliminary results.
• Ziegler, Amanda; Ricardo de Freitas, Thaise; Altenburger, Andreas; Alve, Elisabeth; Bluhm, Bodil & Bodur, Yasemin V. [Show all 17 contributors for this article] (2022). Lack of (or weak) seasonality in Barents sea and Nansen Basin sediments and biota? A preliminary assessment.
• Ziegler, Amanda; Bluhm, Bodil; Jørgensen, Lis Lindal; Renaud, Paul Eric & Ricardo de Freitas, Thaise (2022). Pelagic-benthic coupling in the Northern Barents Sea: Insights from bulk stable isotope analysis of the benthic community.
• Ziegler, Amanda; Ricardo de Freitas, Thaise; Bluhm, Bodil; Jørgensen, Lis Lindal & Renaud, Paul Eric (2022). Seasonal and spatial variability of pelagic-benthic coupling strength in the Northern Barents Sea: A benthic food web approach.
• Ricardo de Freitas, Thaise; Alve, Elisabeth; Hess, Silvia & Renaud, Paul Eric (2021). Drivers of organic carbon distribution and accumulation in the Northern Barents Sea.
• Gerland, Sebastian; Wold, Anette; Al-Habahbeh, Amalia Keck; Anglada Ortiz, Griselda; Amargant-Arumi, Marti & Bodur, Yasemin V. [Show all 35 contributors for this article] (2022). Seasonal Cruise Q1 2021: Cruise Report . Septentrio Academic Publishing. ISSN 2703-7525.
• Søreide, Janne; Gradinger, Rolf Rudolf; Amargant-Arumi, Marti; Amundsen, Rita; Blitz-Thorsen, Julie & Bodur, Yasemin V. [Show all 33 contributors for this article] (2022). Seasonal cruise Q4 2019 : Cruise Report . Septentrio Academic Publishing. ISSN 2703-7525.
• Ludvigsen, Martin; Assmy, Philipp; Adams, Matthew James Samuel; Arumi, Marti A.; Mo-Bjørkelund, Tore & Bodur, Yasemin V. [Show all 35 contributors for this article] (2022). Seasonal cruise Q2 2021: Cruise Report . Septentrio Academic Publishing. ISSN 2703-7525. Show summary

  The spring season was the target for the Nansen Legacy cruise organized in late April and first half of May 2021 following the transect defined for this series of cruises to capture the variations of the year sampling physical, biological and chemical conditions in the ice and the sea. The transect went through both open water and ice. Seven process stations were visited (P1 through P7) together with smaller NLEG stations according to the program for the seasonal investigations. The first station (P1) was in open waters, while the remaining six main station had ice coverage of varying degree. Each of the process stations lasted 24 hours or more to allow a full diurnal cycle. Sampling included ice physics, ice samples, phytoplankton, zooplankton, marine chemistry and eco toxicology using acoustic, optical and robotics methods together with lab analyses of physical samples. Remote sensing data were also matched with in situ observations of both sea and ice conditions.

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