Svein Jakob Saltveit

• Brown, Lee E.; Khamis, Kieran; Wilkes, Martin; Blaen, Phillip; Brittain, John E; Carrivick, Jonathan L.; Fell, Sarah; Friberg, Nikolai; Füreder, Leopold; Gíslason, Gísli M; Hainie, Sarah; Hannah, David M.; James, William H. M.; Lencioni, Valeria; Olafsson, Jon S.; Robinson, Christopher T.; Saltveit, Svein J; Thompson, Craig & Milner, Alexander M. (2018). Functional diversity and community assembly of river invertebrates show globally consistent responses to decreasing glacier cover. Nature Ecology and Evolution.  ISSN 2397-334X.  2(2), s 325- 333 . doi: 10.1038/s41559-017-0426-x Vis sammendrag

  Global change threatens invertebrate biodiversity and its central role in numerous ecosystem functions and services. Functional trait analyses have been advocated to uncover global mechanisms behind biodiversity responses to environmental change, but the application of this approach for invertebrates is underdeveloped relative to other organism groups. From an evaluation of 363 records comprising >1.23 million invertebrates collected from rivers across nine biogeographic regions on three continents, consistent responses of community trait composition and diversity to replicated gradients of reduced glacier cover are demonstrated. After accounting for a systematic regional effect of latitude, the processes shaping river invertebrate functional diversity are globally consistent. Analyses nested within individual regions identified an increase in functional diversity as glacier cover decreases. Community assembly models demonstrated that dispersal limitation was the dominant process underlying these patterns, although environmental filtering was also evident in highly glacierized basins. These findings indicate that predictable mechanisms govern river invertebrate community responses to decreasing glacier cover globally.

• Nilsson, Anna; L'Abee-Lund, Jan Henning; Vøllestad, Leif Asbjørn; Jerstad, Kurt; Larsen, Bjørn Mejdell; Røstad, Ole Wiggo; Saltveit, Svein Jakob; Skaugen, Thomas; Stenseth, Nils Christian & Walseng, Bjørn (2018). The potential influence of Atlantic salmon Salmo salar and brown trout Salmo trutta on density and breeding of the white-throated dipper Cinclus cinclus. Ecology and Evolution.  ISSN 2045-7758.  8(8), s 4065- 4073 . doi: 10.1002/ece3.3958 Fulltekst i vitenarkiv. Vis sammendrag

  Interactions between birds and fish are often overlooked in aquatic ecosystems. We studied the influence of Atlantic salmon and brown trout on the breeding population size and reproductive output of the white-throated dipper in a Norwegian river. Acidic precipitation led to the extinction of salmon, but salmon recolonized after liming was initiated in 1991. We compared the dipper population size and reproductive output before (1978–1992) and after (1993–2014) salmon recolonization. Despite a rapid and substantial increase in juvenile salmon, the breeding dipper population size and reproductive output were not influenced by juvenile salmon, trout, or total salmonid density. This might be due to different feeding strategies in salmonids and dippers, where salmonids are mainly feeding on drift, while the dipper is a benthic feeder. The correlation between the size of the dipper population upstream and downstream of a salmonid migratory barrier was similar before and after recolonization, indicating that the downstream territories were not less attractive after the recolonization of salmon. Upstream dipper breeding success rates declined before the recolonization event and increased after, indicating improved water quality due to liming, and increasing invertebrate prey abundances and biodiversity. Surprisingly, upstream the migratory barrier, juvenile trout had a weak positive effect on the dipper population size, indicating that dippers may prey upon small trout. It is possible that wider downstream reaches might have higher abundances of alternative food, rending juvenile trout unimportant as prey. Abiotic factors such as winter temperatures and acidic precipitation with subsequent liming, potentially mediated by preyabundance, seem to play the most important role in the life history of the dipper. birds, breeding, predators, river, salmonids

• Sun, Zhenhua; Brittain, John Edward; Sokolova, Ekaterina; Thygesen, Helene; Saltveit, Svein Jakob; Rauch, Sebastian & Meland, Sondre (2018). Aquatic biodiversity in sedimentation ponds receiving road runoff - What are the key drivers?. Science of the Total Environment.  ISSN 0048-9697.  610-611, s 1527- 1535 . doi: 10.1016/j.scitotenv.2017.06.080 Fulltekst i vitenarkiv. Vis sammendrag

  Recently, increased attention has been paid to biodiversity conservation provided by blue-green solutions such as engineered ponds that are primarily established for water treatment and flood control. However, little research has been done to analyse the factors that affect biodiversity in such ponds. The purpose of this study was to evaluate the influence of environmental factors on aquatic biodiversity, mainly macroinvertebrate communities, in road sedimentation ponds in order to provide a foundation for recommendations on aquatic biodiversity conservation. Multivariate statistical methods, including unconstrained and constrained analysis, were applied to examine the relationships between organisms and the water quality as well as physical factors (including plant cover). Stepwise multiple regressions indicated that the most important variables governing the variation in the biological community composition were pond size, average annual daily traffic, metals, chloride, distance to the closest pond from study pond, dissolved oxygen, hydrocarbons, and phosphorus. The presence of most taxa was positively correlated with pond size and negatively correlated with metals. Small ponds with high pollutant loadings were associated with a low diversity and dominated by a few pollution tolerant taxa such as oligochaetes. A comprehensive understanding of impacts of various environmental factors on aquatic biodiversity is important to effectively promote and conserve aquatic biodiversity in such sedimentation ponds. Our results indicate that road sedimentation ponds should be designed large enough, because large ponds are likely to provide a more heterogeneous habitat and thus contain a species rich fauna. In addition, larger ponds seem to be less contaminated due to dilution compared to smaller ponds, thereby maintaining a higher biodiversity. Finally, creating some additional ponds in the vicinity of the sedimentation ponds in areas with few water bodies would increase the connectivity that facilitates the movement of invertebrates between ponds.

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• Greipsland, Inga; Roseth, Roger; Pettersen, Ruben Alexander; Bechmann, Pernille; Lundsør, Elisabeth; Brabrand, Åge & Saltveit, Svein Jakob (red.) (2019). E-18 Lysaker-Ramstadsletta. Forundersøkelser av vannkjemi og biologiske kvalitetselement 2018.. NIBIO Rapport. 39. Fulltekst i vitenarkiv. Vis sammendrag

  Det er planlagt bygging av ny E18 mellom Lysaker og Ramstadsletta. Bærumsdiagonalen fra Gjønnes til Strand, samt ny adkomst til Fornebu inngår i prosjektet. Etter oppdrag fra Statens vegvesen har NIBIO med samarbeidspartnere Norconsult og LFI (Laboratorium for Ferskvannsøkologi og Innlandsfiske, UiO) utført forundersøkelser av vannforekomster som kan bli berørt av utbyggingen. Undersøkelsene har omfattet resipienter både i ferskvann og i kystsonen, og har hatt som mål å klarlegge økologisk og kjemisk tilstand gjennom undersøkelse av biologiske kvalitetsparametere og vannkjemi. I marint miljø og i strandsonen har det også blitt utført undersøkelser for å klarlegge naturverdi og lokalt naturmangfold....

• Brabrand, Åge; Olstad, Kjetil; Saltveit, Svein Jakob; Pavels, Henning; Dokk, John Gunnar & Johnsen, Stein Ivar (2018). Fiskebiologisk undersøkelse av Bandak, Telemark.. UiO Naturhistorisk museum Rapport. 72.
• Brabrand, Åge; Saltveit, Svein Jakob; Bremnes, Trond & Pavels, Henning (2018). Fiskeribiologiske undersøkelser i Aursjøen i Lesja og Nesset kommuner. UiO Naturhistorisk museum Rapport. 71.
• Bremnes, Trond & Saltveit, Svein Jakob (2018). Økologisk tilstand i elver og bekker i Salten vannområde basert på bunndyr. UiO Naturhistorisk museum Rapport. 79.
• Casas-Mulet, Roser; Saltveit, Svein Jakob & Alfredsen, Knut (2018). Thermal modelling to help target mitigation strategies for early life stages salmonid survival in hydropeaking rivers.
• Saltveit, Svein Jakob; Brabrand, Åge; Bremnes, Trond & Pavels, Henning (2018). Overvåking av ørret og ørekyt i Hallingdalselva i perioden 2014 til 2017. UiO Naturhistorisk museum Rapport. 74.
• Saltveit, Svein Jakob; Brabrand, Åge & Pavels, Henning (2018). Overvåkning av fiskebestandene i Tokkeåi i Telemark. Resultater fra undersøkelsen i 2018. UiO Naturhistorisk museum Rapport. 75.

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