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Screening Programme 2023
Full text linkProsjektleder: Cathrine Brecke GundersenThe 2023 Screening Programme aimed to investigate the presence of emerging environmental concerning substances 1) at so-called “hot spot” locations, and 2) in marine top predators. Part 1 covered emerging substances that were considered for EU regulation; persistent, mobile and toxic; identified as problematic (Sweden); and UV-stabilizers. Sampling sites were a wastewater treatment plant, indoor dust, agricultural soils, and consumer products. Part 2 covered substances found in the 2021 Screening Programme as well as selected through the LIfeAPEX project. Additionally, in part 2, several classical legacy contaminants were included. A unique sample set was assembled with different types of tissue from whales (killer whale, sperm whale, fin whale, humpback whale, white beaked dolphin, and harbor porpoise) and sharks (greenland shark, porbeagle shark, and spiny dogfish). Highlights from the results in part 1 covered a high detection frequency and concentrations of one phthalate (CAS 6422-86-2) and two UV-stabilizers (CAS 154702-15-5 and 103597-45-1). In part 2, only a small number of the emerging substances were identified, while many of the legacy substances were found at high levels.Norwegian Environment AgencypublishedVersio
Modelling future levels of nitrosamines and nitramines in a groundwater compartment close to a CO2 capture facility
Full text linkProsjektleder: Cathrine Brecke GundersenFrigitt fra konfidensialitet etter avtale med oppdragsgiver.Future levels of the carcinogenic and potentially carcinogenic nitrosamines (NSAs) and nitramines (NAs), respectively, were modelled in two water protection aquifers, Ramlösa Hälsobrunn and Åstorp, considering amine-based CO2 capture at the nearby Filborna EfW plant. A high-resolution and dynamic catchment model (INCA- Contaminants) was used. NSA and NA deposition rates (provided by Norsk Energi) were combined with site specific information (hydrology and climate), and literature values of NSA and NA physiochemical properties and degradation rates. Water residence time and NSA and NA biodegradation half-lives were found to be the most uncertain and influential parameters. At both sites, NSA and NA levels are likely to remain below the recommended safety limit (4 ng L-1), but care should be taken due to the uncertainty of the half-life. At Åstorp, additional uncertainty is associated with the result due to the uncertain water residence time of the aquifer.Öresundskraft Kraft & Värme ABpublishedVersio
Social and genetic connectivity despite ecological variation in a killer whale network
Full text linkPhilopatric kin-based societies encourage a narrow breadth of conservative behaviours owing to individuals primarily learning from close kin, promoting behavioural homogeneity. However, weaker social ties beyond kin, and across a behaviourally diverse social landscape, could be sufficient to induce variation and a greater ecological niche breadth. We investigated a network of 457 photo-identified killer whales from Norway (548 encounters in 2008–2021) with diet data available (46 mixed-diet individuals feeding on both fish and mammals, and 411 exclusive fish-eaters) to quantify patterns of association within and between diet groups, and to identify underlying correlates. We genotyped a subset of 106 whales to assess patterns of genetic differentiation. Our results suggested kinship as main driver of social bonds within and among cohesive social units, while diet was most likely a consequence reflective of cultural diffusion, rather than a driver. Flexible associations within and between ecologically diverse social units led to a highly connected network, reducing social and genetic differentiation between diet groups. Our study points to a role of social connectivity, in combination with individual behavioural variation, in influencing population ecology in killer whales.publishedVersio
Successful large-scale and long-term kelp forest restoration by culling sea urchins with quicklime and supported by crab predation
Full text linkIn 2013, a large scale (70 hectare) kelp forest restoration experiment was conducted in a sea urchin barren that had been stable for 45 years. We used 200 tons of quicklime to eradicate the sea urchin population. Kelp recovered within a year in the lime-treated sites. Quickliming did not significantly affect the abundance of non-target species. Mobile kelp fauna colonized the restored kelps, but at a slower rate than kelp and other macroalgae, probably due to slower dispersal abilities. The monitoring period (2012–2021) encompassed the expansion of invasive red king crabs, which emerged as a novel predator of sea urchins. This led to a gradual decline in sea urchin populations and facilitated kelp recovery also in the control sites. This delayed recovery does not invalid the conclusions of the short-term efficiency of the quicklime treatment, but it makes it difficult to conclude about the long-term effects. The study shows that quickliming can initiate kelp recovery within large urchin barrens. We postulate that the recovery of kelps outside the limed areas was due to crab predation, and that successful kelp restoration in areas with recruitment of sea urchins depends on a persistent top-down control of the urchins.publishedVersio
Importance of environmental signals for cardiac morphological development in Atlantic salmon
Full text linkThe hearts of salmonids display remarkable plasticity, adapting to various environmental factors that influence cardiac function and demand. For instance, in response to cold temperature, the salmonid heart undergoes growth and remodeling to counterbalance the reduced contractile function associated with dropping temperatures. Alongside heart size, the distinct pyramidal shape of the wild salmonid heart is essential for optimal cardiac performance, yet the environmental drivers behind this optimal cardiac morphology remain to be fully understood. Intriguingly, farmed salmonids often have rounded, asymmetrical ventricles and misaligned bulbi from an early age. These deformities are noteworthy given that farmed salmon are often not exposed to natural cues, such as a gradual temperature increase and changing day lengths, during critical developmental stages. In this study, we investigated whether natural environmental conditions during early life stages are pivotal for proper cardiac morphology. Atlantic salmon were raised under simulated natural conditions (low temperature with a natural photoperiod; SimNat) and compared with those reared under simulated farming conditions (SimFarm). Our findings reveal that the ventricle shape and bulbus alignment in SimNat fish closely resemble those of wild salmon, while functional analyses indicate significant differences between SimNat and SimFarm hearts, suggesting diastolic dysfunction and higher cardiac workload in SimFarm hearts. These findings highlight the profound influence of environmental factors such as water temperature and photoperiod on the structural development of the salmonid heart, underscoring the importance of early environmental conditions for cardiac health.publishedVersio
The fate of post-use biodegradable PBAT-based mulch films buried in agricultural soil
Full text linkThe fate of black biodegradable mulch film (MF) based on starch and poly(butylene-adipate-co-terephthalate) (PBAT) in agricultural soil is investigated herein. Pristine (BIO-0) and UV-aged film samples (BIO-A192) were buried for 16 months at an experimental field in southern Italy. Visual, physical, chemical, morphological, and mechanical analyses were carried out before and after samples burial. Film residues in the form of macro- and microplastics in soil were analyzed at the end of the trial. Progressive deterioration of both pristine and UV-aged samples, with surface loss and alterations in mechanical properties, occurred from 42 days of burial. After 478 days, the apparent surface of BIO-0 and BIO-A192 films decreased by 57 % and 66 %, respectively. Burial determined a rapid depletion of starch from the polymeric blend, especially for the BIO-A192, while the degradation of the polyester phase was slower. Upon burial, an enrichment of aromatic moieties of PBAT in the film residues was observed, as well as microplastics release to soil. The analysis of the MF degradation products extracted from soil (0.006–0.008 % by mass in the soil samples) revealed the predominant presence of adipate moieties. After 478 days of burial, about 23 % and 17 % of the initial amount of BIO-0 and BIO-A192, respectively, were extracted from the soil. This comprehensive study underscores the complexity of biodegradation phenomena that involve the new generation of mulch films in the field. The different biodegradability of the polymeric components, the climate, and the soil conditions that did not strictly meet the parameters required for the standard test method devised for MFs, have significantly influenced their degradation rate. This finding further emphasizes the importance of implementing field experiments to accurately assess the real effects of biodegradable MFs on soil health and overall agroecosystem sustainability.publishedVersio
Kinetic Isotope Effects During Reduction of Fe(III) to Fe(II): Large Normal and Inverse Isotope Effects for Abiotic Reduction and Smaller Fractionations by Phytoplankton in Culture
Full text linkIron stable isotopes (δ56Fe) are a useful tool for studying Earth processes, many of which involve redox transformations between Fe(III) and Fe(II). Here, we present two related experimental efforts, a study of the kinetic isotope effects (KIEs) associated with the reduction of Fe(III)-ethylenediaminetetraacetic acid (EDTA) to Fe(II), and measurements of the biological fractionation of Fe isotopes by phytoplankton in culture. Reductants tested were ascorbate, hydroxylamine, Mn(II), dithionite, and photoreduction at pH between 5 and 9 and temperatures from 0 to 100°C. Isotope fractionations were very large, and included both normal and inverse KIEs, ranging from −4‰ to +5‰. Experiments were reproducible, yielding similar results for triplicate experiments run concurrently and for experiments run weeks apart. However, fractionations were not predictable, without a clear relationship to reaction rate, temperature, pH, or the reductant used. Acquisition of Fe by eukaryotic phytoplankton also often involves the reduction of Fe(III) to Fe(II). Several species of diatoms and a coccolithophore were tested for Fe isotope fractionation in culture using EDTA, NTA, and DFB as Fe(III) chelating ligands, yielding fractionations from −1.3‰ to +0.6‰. Biological isotope effects were also unpredictable, showing no clear relationship to species, growth rate, or Fe concentration. Variability in Fe isotope fractionation observed in culture may be explained in part by the sensitivity of KIEs. This work has implications for the industrial purification of isotopes, interpretation of natural δ56Fe, and the use of Fe isotopes as a tracer Fe source and biological processes in the ocean and other natural systems.publishedVersio
Ny brønnbåtkunnskap - biologiske risikofaktorer ved bruk av brønnbåt til transport og behandling av laks (NYBRØK - 901788)
Full text linkProsjektleder: Ole-Kristian Hess-ErgaModerate (400 μg/l) og høye konsentrasjoner (800 μg/l) av totalsink (Zn) under simulert ferskvannsbehandling med bløtt vann, kan påføre fisken for stor belastning. De fysiologiske responsene er ikke tilstrekkelige til å kompensere for det osmotisk stresset fisken påføres, noe som fører til at fisken dør ved tilbakeføring til sjøvann. Det var imidlertid tydelig at fisken klarte seg bedre i ubehandlet ferskvann med humus, sammenlignet med humus-fattig ferskvann som var tilsatt silikatlut. Simulert lasting viste at lastetid utover en time ved trykkforhold rundt 0,4 ata medførte avvikende adferd, luftbobler i blodomløpet og i finnene, og fiskedød. Den simulerte lossingen på 2,6 ata medførte ingen fiskedød. Adferdsavvik i form av hyperaktivitet, hypoaktivitet og likevektproblemer var en viktig støtte i den kliniske vurderingen ved trykkfallindusert gassboblesyke. Ved måling av totalgass og beregning av totalgassmetning må lufttrykket over vannspeilet benyttes. Mer enn normal metning av en enkeltgass (f.eks. nitrogen) fører ikke nødvendigvis til totalgassovermetning (>100 % TGP) og gassboblesyke. Det er totalgassovermetning som påvirker fisken og kan føre til gassboblesyke.Fiskeri- og havbruksnæringens forskningsfinansiering AS (FHF)publishedVersio
Not in it for the money: Meaningful relationships sustain voluntary land conservation initiatives in Peru
Full text link1. Voluntary land conservation, including privately protected areas (PPAs), is a key component of enabling the future of biodiversity on Earth. Accordingly, the question of motivations has preoccupied conservation social science. True motivations are difficult to ascertain, however, even for ourselves. 2. Accordingly, we explore a novel narrative elicitation approach to ask: what features of the land and landowners' relationships with the land encourage and sustain their commitment to voluntary conservation? What value framings are conveyed by landowners when sharing their origin stories and the reasons for sustaining such efforts? 3. We conducted semi-structured interviews with 32 landowners of PPAs across Peru. Interviews were designed to elicit landowners' origin stories and ongoing relationships with the land, as well as the values they hold about those relationships. 4. This paper challenges the current perception that PPAs are driven by wealthy and foreign landowners in the Peruvian context. Instead, this paper showcases PPAs as the manifestation of local visions for conservation that align with the landowners' longstanding relationships with the land. Here we identified 15 different relational values that landowners have with nature, non-human and human beings that underlie their voluntary conservation efforts. 5. The paper highlights the importance of taking a relational perspective (recognizing that our existence is enabled and shaped by the relationships we have with others and with nature) when studying land conservation, emphasizing how PPAs are the reflection of landowners' intention to maintain, protect and restore the multiple relationships embedded in the land they strive to conserve.publishedVersio
Low levels of per- and polyfluoroalkyl substances (PFAS) detected in drinking water in Norway, but elevated concentrations found near known sources
Full text linkPer- and polyfluoroalkyl substances (PFAS) are ubiquitous contaminants which are also found in drinking water. Concentration levels in drinking water vary widely and range from a very low contribution to total daily exposure for humans to being the major source of uptake of PFAS. PFAS concentrations in Norwegian drinking water has been rarely reported. We investigated concentrations of 31 PFAS in 164 water samples, representing both source water (i.e., before drinking water treatment) and finished drinking water. Samples were taken from 18 different water bodies across Norway. The 17 waterworks involved supply drinking water to 41 % of the Norwegian population. Only four of the waterworks utilised treatment involving activated carbon which was able to significantly reduce PFAS from the source water. Samples of source water from waterworks not employing activated carbon in treatment were therefore considered to represent drinking water with regards to PFAS (142 samples). All samples from one of the water bodies exceeded the environmental quality standard (EQS) for perfluorooctane sulfonic acid (PFOS) according to the water framework directive (0.65 ng/L). No concentrations exceeded the sum of (20) PFAS (100 ng/L) specified in the EU directive 2020/2184 for drinking water. Several EU countries have issued lower guidelines for the sum of the four PFAS that the European Food Safety Authority (EFSA) has established as the tolerable weekly intake (TWI) for PFOS, perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA), and perfluorohexane sulfonic acid (PFHxS). Denmark and Sweden have guidelines specifying 2 and 4 ng/L for the sum of these PFAS. Only one of the 142 drinking water samples exceeded the Danish TWI and contained a sum of 6.6 ng/L PFAS. A population exposure model, for individuals drinking water from the investigated sources, showed that only 0.5 % of the population was receiving PFAS concentrations above the Danish limit of 2 ng/L.publishedVersio