Browsing NTNU Open by Author "Aberle-Malzahn, Nicole"

Advancing Ocean Observation with an AI-driven Mobile Robotic Explorer

Saad, Aya; Stahl, Annette; Våge, Andreas; Davies, Emlyn John; Nordam, Tor; Aberle-Malzahn, Nicole; Ludvigsen, Martin; Johnsen, Geir; Sousa, João; Rajan, Kanna (Journal article; Peer reviewed, 2020)

Rapid assessment and enhanced knowledge of plankton communities and their structure in the productive upper water column is of crucial importance to understand the impact of the changing climate on upper ocean processes. ...

Analyzing the Impacts of Elevated-CO2 Levels on the Development of a Subtropical Zooplankton Community During Oligotrophic Conditions and Simulated Upwelling

Alguero-Muniz, Maria; Horn, Henriette G.; Alvarez-Fernandez, Santiago; Spisla, Carsten; Aberle-Malzahn, Nicole; Bach, Lennart T.; Guan, Wanchun; Achterberg, Erik P.; Riebesell, Ulf; Boersma, Maarten (Journal article; Peer reviewed, 2019)

Ocean acidification (OA) is affecting marine ecosystems through changes in carbonate chemistry that may influence consumers of phytoplankton, often via trophic pathways. Using a mesocosm approach, we investigated OA effects ...

Assessing the Value of a Citizen Science Approach for Ctenophore Identification

Johansen, Ellie; Aberle-Malzahn, Nicole; Østensen, Mari-Ann; Majaneva, Sanna (Journal article; Peer reviewed, 2021)

During the era of biodiversity loss, a complete species census and understanding where the different species occur is of high priority. Even though this knowledge has increased tremendously, mainly with expanded use of ...

Assessment of key microzooplankton species from Trondheimsfjorden using morphological and molecular methods

Wallin, Jan Konrad (Master thesis, 2019)

Mikrozooplankton (MZP) er heterotrofiske og mixotrofe organismer i størrelsesområdet 20 - 200 µm. Disse organismene er vanskelige å artsbestemme med molekylære identifikasjonsmetoder. Det er mangelfullt med referansedata ...

Autonomous Underwater Vehicle (AUV) based study of zooplankton communities, using a silhouette camera and artificial intelligence

Nøland, Annecken (Master thesis, 2022)

Autonome undervannsfarkoster (AUV), som kan tilpasses med en montert sensorpakke, har vist seg å være nyttige for økologistudier av plankton ved å gi kontinuerlige romlige og tidsmessige observasjoner over mesoskalaen. En ...

Bottom-up and top-down control mechanisms affecting the feeding and growth of the cultivated barnacle Balanus crenatus

Hovden, Maria (Master thesis, 2022)

Sammendrag Kultivering av skipsrur (Balanus crenatus) som blir benyttet til produksjon av levende-fôr til marin fiskeyngel, har vist seg å være utfordrende. Problemet er ikke å få dem til å vokse, men å forstå de biotiske ...

Broad-scale distribution of the winter protozooplankton community in the North Sea.

Bils, Franziska; Moyano, Marta; Aberle-Malzahn, Nicole; van Damme, Cindy JG; Nash, Richard David Marriott; Kloppmann, Matthias; Loots, Christophe; Peck, Myron A. (Journal article; Peer reviewed, 2018)

Protozooplankton (PZP) (here size range: 12–200 μm) are rarely sampled over a broad scale, especially in ecosystem monitoring programs, despite their trophodynamic importance as grazers in the microbial loop and as prey ...

Contrasting phytoplankton-zooplankton distributions observed through autonomous platforms, in-situ optical sensors and discrete sampling

Fragoso, Glaucia Moreira; Davies, Emlyn John; Fossum, Trygve Olav; Ullgren, Jenny; Majaneva, Sanna; Aberle-Malzahn, Nicole; Ludvigsen, Martin; Johnsen, Geir (Peer reviewed; Journal article, 2022)

Plankton distributions are remarkably ‘patchy’ in the ocean. In this study, we investigated the contrasting phytoplankton-zooplankton distributions in relation to wind mixing events in waters around a biodiversity-rich ...

Dietary and seasonal variability in trophic relations at the base of the North Sea pelagic food web revealed by stable isotope and fatty acid analysis

Katherina L., Schoo; Maarten, Boersma; Malzahn, Arne; Martin G.J., Loeder; Karen H., Wiltshire; Aberle-Malzahn, Nicole (Journal article; Peer reviewed, 2018)

A two-dimensional biomarker approach including fatty acids and stable isotopes of seston and copepods was applied to examine how the variability at the base of the food web affects trophic interactions between primary ...

Distribution, interspecific variation and habitats of scyphozoan polyp colonies in Trondheimsfjorden

Rekstad, Matias Einer (Master thesis, 2019)

Manetoppblomstringer er fremdeles et emne med høy økonomisk og økologisk betydning. Det er også en pågående debatt om hvorvidt frekvensen og intensiteten av maneoppblomstringer øker eller ikke. Kombinert med tvetydige data ...

Effect of temperature on the settling rate, survival, ingestion rate and biochemical composition of the polyp stages of A. aurita

Myrvold, Stian (Master thesis, 2020)

Store manetansamlinger kjent som manetoppblomstringer er forventet å øke som en følge av menneskeskapte påvirkninger. Oppblomstringene er kjent for å føre til økonomiske, og potensielt økologiske, skader. GoJelly er et EU ...

Effects on the survival and development of Acartia tonsa fed different Rhodomonas species cultivated on different nitrogen concentrations

Johannesen, Unn Vagnsdóttir (Master thesis, 2018)

Marine larvae need a live feed with a high amount of PUFA especially EPA and DHA to have a healthy development. Copepods are the preferred choice of live feed since they are there natural food source and have the right ...

Feeding ecology and behavior of nudibranchs from the sublittoral zones of Trondheimsfjorden and interactions with fouling communities

Haugen, Live Agnethe Sørlundsengen (Master thesis, 2022)

Stormaneter eller medusa i klassen Scyphozoa opptrer som en plage for fiskevelferd i akvakulturmerder, for rekreasjonsverdien i kystnære områder, og ovenfor deres eget rykte. Deres bentiske polyppstadie forårsaker ...

Identification and population genetic analysis of jellyfish blooms in Trondheimsfjord Role of polyps in jellyfish populations connectivity

Wihen, Aditya (Master thesis, 2021)

There is a strong need to utilize jellyfish biomass in both economic and ecological way. These two aspects rely on the capability of jellyfish to bloom in large quantities and on accurate prediction on where and when ...

Jellyfishing in Europe: Current status, knowledge gaps, and future directions towards a sustainable practice

Edelist, Dori; Angel, Dror L.; Canning-clode, João; Gueroun, Sonia K. M.; Aberle-Malzahn, Nicole; Javidpour, Jamileh; Andrade, Carlos (Peer reviewed; Journal article, 2021)

Jellyfish are often described as a nuisance species, but as our understanding shifts to more ecosystem-based conceptions, they are also recognized as both important components of marine ecosystems and a resource for humans. ...

LIFE HISTORY DYNAMICS OF THE SCYPHOZOAN JELLYFISH AURELIA SPP.: A COMBINED META-ANALYSIS AND MODELLING APPROACH

Barakat, Peter (Master thesis, 2020)

One of the most common jellyfish genera are the cnidarian scyphozoans Aurelia spp. They are spread across most of our oceans and seas, have a complex life cycle and are a bloom forming species. Jellyfish blooms are perceived ...

Long-term dynamics, population structure and connectivity of the helmet jellyfish Periphylla periphylla in a Norwegian fjord and adjacent waters

Aberle-Malzahn, Nicole; Volpe, Charlotte; Østensen, Mari-Ann; Majaneva, Sanna Kristiina (Journal article; Peer reviewed, 2023)

Mass occurrences of Periphylla periphylla in Norwegian fjords cause major concerns related to potential regime shifts that could affect ecosystem stability. 15 years of trawl data (2006–2015), complemented with comprehensive ...