Svein Jakob Saltveit

• Sun, Zhenhua; Sokolova, Ekaterina; Brittain, John Edward; Saltveit, Svein Jakob; Rauch, Sébastien & Meland, Sondre (2019). Impact of environmental factors on aquatic biodiversity in roadside stormwater ponds. Scientific Reports.  ISSN 2045-2322.  9 . doi: 10.1038/s41598-019-42497-z Fulltekst i vitenarkiv. Vis sammendrag

  Constructed stormwater ponds mitigate runoff volumes and pollution, and provide other ecosystem services, such as supporting biodiversity, but these services attracted relatively less attention. The impacts of the pollution levels in the water column and sediments, the physical characteristics of ponds, and the presence of amphibians on the macroinvertebrate community composition and biodiversity were explored in twelve stormwater ponds in Norway. Also, the similarities between macroinvertebrate, zooplankton and plant communities were explored. Most of the taxa displayed in the ordination diagram were positively correlated with the pond size and the number of neighbouring ponds, and negatively correlated with the pollution levels in the water column and sediments. However, no statistically significant impacts on the number of taxa and Shannon index were observed. There were low similarities between the macroinvertebrate and zooplankton community compositions as well as between the plant and macroinvertebrate community compositions in the stormwater ponds. We observed a significant positive correlation between the number of plant and of zooplankton taxa, and a weak non-significant positive correlation between the number of plant and of macroinvertebrate taxa. Overall, the explanatory variables had a significant impact on the community composition, but not on the number of taxa nor Shannon index.

• 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

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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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