Blar i forfatter "Holding, Johnna"

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    • Effects of Ocean Acidification and Warming on Sperm Activity and Early Life Stages of the Mediterranean Mussel (Mytilus galloprovincialis) 

      Vihtakari, Mikko; Hendriks, Iris E.; Holding, Johnna; Renaud, Paul E.; Duarte, Carlos M.; Havenhand, Jon N. (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      Larval stages are among those most vulnerable to ocean acidification (OA). Projected atmospheric CO2 levels for the end of this century may lead to negative impacts on communities dominated by calcifying taxa with planktonic life stages. We exposed Mediterranean mussel (Mytilus galloprovincialis) sperm and early life stages to pHT levels of 8.0 (current pH) and 7.6 (2100 level) by manipulating pCO2 ...

    • Experimentally determined temperature thresholds for Arctic plankton community metabolism 

      Holding, Johnna; Duarte, Carlos M.; Arrieta, Jesús M.; Vaquer-Suyner3, Riser; Coello-Camba, Alexandra; Wassmann, Paul; Agusti, Susana (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      Climate warming is especially severe in the Arctic, where the average temperature is increasing 0.4 C per decade, two to three times higher than the global average rate. Furthermore, the Arctic has lost more than half of its summer ice extent since 1980 and predictions suggest that the Arctic will be ice free in the summer as early as 2050, which could increase the rate of warming. Predictions ...

    • Seasonal patterns in Arctic planktonic metabolism (Fram Strait - Svalbard region) 

      Vaquer-Sunyer, Raquel; Duarte, Carlos M.; Regaudie-de-Gioux, A; Holding, Johnna; García-Corral, LS; Reigstad, Marit; Wassmann, Paul (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      The metabolism of the Arctic Ocean is marked by extremely pronounced seasonality and spatial heterogeneity associated with light conditions, ice cover, water masses and nutrient availability. Here we report the marine planktonic metabolic rates (net community production, gross primary production and community respiration) along three different seasons of the year, for a total of eight cruises ...

    • Towards a unifying pan-arctic perspective: A conceptual modelling toolkit 

      Wassmann, Paul; Carmack, E.; Bluhm, Bodil; Duarte, Carlos M.; Berge, Jørgen; Brown, K.; Grebmeier, Jacqueline M.; Holding, Johnna; Kosobokova, Ksenia; Kwok, R.; Matrai, Patricia A.; Agusti, S.; Babin, Marcel; Bhatt, Uma S.; Eicken, Hajo; Polyakov, Igor V.; Rysgaard, Søren; Huntington, Henry P. (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-17)
      The Arctic Ocean is overwhelmingly forced by its lateral boundaries, and interacts with, the global system. For the development of nested conceptual models of the Arctic Ocean ecosystem we here choose the full pan-Arctic as our focal scale. Understanding the pan-Arctic scale, however, requires that we look at the underlying scales of its major components, by considering regionality, connectivity and ...

    • Warming and CO2 enhance arctic heterotrophic microbial activity 

      Vaqué, Dolors; Lara, Elena; Arrieta, Jesús M.; Holding, Johnna; Sa, Elisabet L; Hendriks, Iris E.; Coello-Camba, Alexandra; Alvarez, Marta; Agusti, Susana; Wassmann, Paul; Duarte, Carlos M. (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-03-20)
      Ocean acidification and warming are two main consequences of climate change that can directly affect biological and ecosystem processes in marine habitats. The Arctic Ocean is the region of the world experiencing climate change at the steepest rate compared with other latitudes. Since marine planktonic microorganisms play a key role in the biogeochemical cycles in the ocean it is crucial to ...