Browsing NIVA Open Access Archive by Author "Christie, Hartvig C"
Now showing items 1-20 of 39
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Bispevika. Vurdering av vannutskiftning og miljøforhold i vannbasseng B6b
Walday, Mats Gunnar; Molvær, Jarle; Rinde, Eli; Sørensen, Elin Tanding; Christie, Hartvig C; Leikvin, Øyvind (NIVA-rapport;7563, Research report, 2020)Oslo S Utvikling (OSU) arbeider med detaljplan for utbygging i Bispevika, med utfylling og bebyggelse i nordøstre del. Her inngår bl.a. to bassenger med innløp fra Bispevika. Det er viktig at bassengene har tilstrekkelig ... -
Can multitrophic interactions and ocean warming influence large-scale kelp recovery?
Christie, Hartvig C; Gundersen, Hege; Rinde, Eli; Filbee-Dexter, Karen; Norderhaug, Kjell Magnus; Pedersen, Torstein; Bekkby, Trine; Gitmark, Janne Kim; Fagerli, Camilla With (Journal article; Peer reviewed, 2019)Ongoing changes along the northeastern Atlantic coastline provide an opportunity to explore the influence of climate change and multitrophic interactions on the recovery of kelp. Here, vast areas of sea urchin‐dominated ... -
Can sea urchin grazing of kelp forests in the arctic make rocky shore systems more vulnerable to oil spills?
Christie, Hartvig C; Bekkby, Trine; Norderhaug, Kjell Magnus; Beyer, Jonny; Jørgensen, Nina Mari (Journal article; Peer reviewed, 2019)In Arctic Norway, the risk of major marine oil spills associated with increasing offshore drilling, land terminal, and maritime transport activities is a cause for concern. Intertidal and subtidal kelp and seaweed communities ... -
Ecosystem accounting’s potential to support coastal and marine governance
Chen, Wenting; Van Assche, Kristof Albert M; Hynes, Stephen; Bekkby, Trine; Christie, Hartvig C; Gundersen, Hege (Peer reviewed; Journal article, 2020)The paper presents an exploratory assessment of ecosystem accounting's potential to support marine and coastal governance. Norwegian kelp forest management and restoration, and a series of nested case studies are used as ... -
Effects of depth and overgrowth of ephemeral macroalgae on a remote subtidal NE Atlantic eelgrass (Zostera marina) community
Baden, Susanne; Fredriksen, Stein; Christie, Hartvig C; Eriander, Louise; Gustafsson, Camilla; Holmer, Marianne; Olesen, Birgit; Thormar, Jonas; Boström, Christoffer (Peer reviewed; Journal article, 2022)We conducted a short-term field sampling complemented with time integrating stable isotope analysis to holistically investigate status and ecological interactions in a remote NE Atlantic Zostera marina meadow. We found ... -
Efficient coralline algal psbA mini barcoding and High Resolution Melt (HRM) analysis using a simple custom DNA preparation
Anglès d'Auriac, Marc; Le Gall, Line; Peña, Viviana; Hall-Spencer, Jason M.; Steneck, Robert S.; Fredriksen, Stein; Gitmark, Janne Kim; Christie, Hartvig C; Husa, Vivian; Grefsrud, Ellen Sofie; Rinde, Eli (Journal article; Peer reviewed, 2019)Coralline algae form extensive maerl and rhodolith habitats that support a rich biodiversity. Calcium carbonate harvesting as well as trawling activities threatens this ecosystem. Eleven species were recorded so far as ... -
Environmental impacts of the diver operated C disc to harvest sea urchins and for kelp restoration
Michelsen, Helena Kling; Fagerli, Camilla With; Christie, Hartvig C (NIVA-rapport;7737-2022, Research report, 2022)NIVA did a 2-day environmental evaluation of the diver operated suction device “C disc” constructed by C robotics. Because the C disc uses suction from a water pump to suck sea urchins from the seafloor, it will collect ... -
Financial and Institutional Support Are Important for Large-Scale Kelp Forest Restoration
Eger, Aron M; Vergés, Adriana; Choi, Chang Geun; Christie, Hartvig C; Coleman, Melinda Ann; Fagerli, Camilla With; Fujita, Daisuke; Hasegawa, Masatoshi; Kim, Jeong Ha; Mayer-Pinto, Mariana; Reed, Dan C; Steinberg, Peter D.; Marzinelli, Ezequiel Miguel (Peer reviewed; Journal article, 2020)Kelps form extensive underwater forests that underpin valuable ecosystem goods and services in temperate and polar rocky coastlines globally. Stressors, such as ocean warming and pollution are causing regional declines of ... -
Genetic heterogeneity of two bioeconomically important kelp species along the Norwegian coast
Evankow, Ann; Christie, Hartvig C; Hancke, Kasper; Brysting, Anne Krag; Junge, Claudia; Fredriksen, Stein; Thaulow, Jens (Journal article; Peer reviewed, 2019)Knowledge of genetic diversity among wild populations is becoming increasingly important as more species are recognized for their bioeconomic value. Industrialization of natural resources, such as kelp in the marine shallow ... -
Global kelp forest restoration: past lessons, present status, and future directions
Eger, Aaron M.; Marzinelli, Ezequiel M.; Christie, Hartvig C; Fagerli, Camilla With; Fujita, Daisuke; Gonzalez, Alejandra P.; Hong, Seok Woo; Kim, Jeong Ha; Lee, Lynn C.; McHugh, Tristin Anoush; Nishihara, Gregory N.; Tatsumi, Masayuki; Steinberg, Peter D.; Verges, Adriana (Peer reviewed; Journal article, 2022)Kelp forest ecosystems and their associated ecosystem services are declining around the world. In response, marine managers are working to restore and counteract these declines. Kelp restoration first started in the 1700s ... -
"Hanging gardens" - comparing fauna communities in kelp farms and wild kelp forests
Bekkby, Trine; Torstensen, Ragnhild Ryther Grimm; Grünfeld, Lars Andreas Holm; Gundersen, Hege; Fredriksen, Stein; Rinde, Eli; Christie, Hartvig C; Walday, Mats Gunnar; Andersen, Guri Sogn; Brkljacic, Marijana Stenrud; Neves, Luiza S.; Hancke, Kasper (Peer reviewed; Journal article, 2023)A growing need for food is causing increased interest for seaweed farming globally. This requires knowledge of the industry’s effects on the marine environment. We therefore aimed to explore the communities hosted by a ... -
Hva bestemmer egenskaper og økologisk funksjon i ålegrasenger?
Christie, Hartvig C; Rinde, Eli; Moy, Frithjof Emil; Bekkby, Trine (NIVA-rapport;6747, Research report, 2014)Juni 2014 ble 27 ålegrasenger i Aust-Agder undersøkt for å analysere hvilke miljøfaktorer som bestemmer egenskaper som tetthet og høyde til ålegrasplanten i engene, og om enger med tett ålegrasvegetasjon er leveområde for ... -
Importance of wave and current exposure to fauna communities in Laminaria hyperborea kelp forest
Norderhaug, Kjell Magnus; Christie, Hartvig C; Rinde, Eli; Gundersen, Hege; Bekkby, Trine (Journal article; Peer reviewed, 2014)Hydrodynamic forces from waves and currents may have strong but different impacts on benthic diversity. In order to study the relative importance of current and wave exposure to the diversity of macrofauna associated with ... -
In a squeeze: Epibiosis may affect the distribution of kelp forests
Andersen, Guri Sogn; Christie, Hartvig C; Moy, Frithjof Emil (Journal article; Peer reviewed, 2019)The processes limiting the population recovery of the kelp Saccharina latissima after recent large‐scale loss from the south coast of Norway are poorly understood. Previous investigations do, however, suggest that the ... -
Incorporating facilitative interactions into small-scale eelgrass restoration—challenges and opportunities
Gagnon, Karine; Christie, Hartvig C; Didderen, Karin; Fagerli, Camilla With; Govers, Laura L.; Gräfnings, Max L. E.; Heusinkveld, Jannes H. T.; Kaljurand, Kaire; Lengkeek, Wouter; Martin, Georg; Meysick, Lukas; Pajusalu, Liina; Rinde, Eli; van der Heide, Tjisse; Boström, Christoffer (Peer reviewed; Journal article, 2021)Marine ecosystem engineers such as seagrasses and bivalves create important coastal habitats sustaining high biodiversity and ecosystem services. Restoring these habitats is difficult due to the importance of feedback ... -
Jomfruland nasjonalpark. Sammenstilling av eksisterende kunnskapom marine naturverdier
Christie, Hartvig C; Rinde, Eli; Gitmark, Janne K.; Walday, Mats (NIVA-rapport;6636, Research report, 2014)Til arbeidet med etablering av Jomfruland nasjonalpark har NIVA fått i oppdrag å sammenstille kunnskap om marine naturverdier, med særlig vekt på naturtyper med st or økologisk verdi. De viktigste naturtypene er ... -
Kartlegging av et utvalg marine naturtyper i Oslofjorden
Rinde, Eli; Bekkby, Trine; Kvile, Kristina Øie; Andersen, Guri Sogn; Brkljacic, Marijana Stenrud; Anglès d'Auriac, Marc; Christie, Hartvig C; Fagerli, Camilla With; Fredriksen, Stein; Moy, Siri Røang; Staalstrøm, Andre; Tveiten, Lise Ann (NIVA-rapport;7605, Research report, 2021)Formålet med prosjektet har vært å skaffe kunnskap om et utvalg marine naturtyper i Oslofjorden, og samtidig skaffe praktisk erfaring med NiN-systemet som verktøy for å dekke miljøforvaltningens behov. Gjennom feltkartlegging ... -
KELPMAP-Vega: Metodeutvikling for kartlegging av tareskog ved bruk av droner og satellittbilder (feltrapport)
Gundersen, Hege; Hancke, Kasper; Poulsen, Robert Nøddebo; Buls, Toms; Ghareeb, Medyan; Christie, Hartvig C; Kile, Maia Røst; Arvidsson, Karoline Slettebø; Kvile, Kristina Øie (NIVA-rapport;7790-2022, Research report, 2022)Rapporten er en del-leveranse i prosjektet "Metodeutvikling for kartlegging av tare ved bruk av droner og satellittbilder" og beskriver metoder for innsamling av høyoppløselige bilder ved hjelp av droner og generering av ... -
Konsekvensvurdering av miljøgiftutlekking fra vraket av MS "Raana" i Bremsnesfjorden ved Kristiansund N
Bakke, Torgeir Heggelund; Golmen, Lars Gunder; Christie, Hartvig C (NIVA-rapport;6915, Research report, 2015)NIVA har gjennomført en miljøkonsekvensvurdering av mulige utslipp og utlekking av miljøgifter fra vraket av MS Raana som sank i Bremsnesfjorden utenfor Kristiansund 12. januar 2007. Vurderingen utgjør ett av flere grunnlag ... -
Lack of sea urchin settlement may explain kelp forest recovery in overgrazed areas in Norway
Fagerli, Camilla With; Norderhaug, Kjell Magnus; Christie, Hartvig C (Journal article; Peer reviewed, 2013)In this study, we investigated whether failure of sea urchin recruitment can explain an ongoing phase shift from overgrazed, barren grounds to kelp forests along the coast of mid- Norway. Settlement of sea urchins on ...