Dorte Krause‐Jensen

Aarhus University

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Carlos M. Duarte

King Abdullah University of Science and Technology

Núria Marbà

Mediterranean Institute for Advanced Studies

Mikael K. Sejr

Aarhus University

Birgit Olesen

Aarhus University

Jacob Carstensen

Aarhus University

ÓS

Óscar Serrano

Edith Cowan University

Pere Masqué

Edith Cowan University

Catherine E. Lovelock

University of Queensland

Peter I. Macreadie

Deakin University

Annette Bruhn

Aarhus University

Cooperative Institutions

Aarhus University

Consejo Superior de Investigaciones Científicas

University of Copenhagen

Centre National de la Recherche Scientifique

University of Southern Denmark

University of Algarve

University of Western Australia

Roskilde University

Centre d'Estudis Avançats de Blanes

Mediterranean Institute for Advanced Studies

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Seagrass fatty acid profiles as a sensitive indicator of climate settings across seasons and latitudes

Marine Environmental Research (2020)

Pedro Beca‐Carretero Freddy Guihéneuf Dorte Krause‐Jensen Dagmar B. Stengel

Zostera marina

10.1016/j.marenvres.2020.105075

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Citations (16)

Biomass, photosynthesis and growth of Laminaria saccharina in a high-arctic fjord, NE Greenland

Marine Biology (2002)

Jens Borum Martin Schou Pedersen Dorte Krause‐Jensen Poul Hedevang Christensen Kurt Nielsen

Saccharina

Fjord

Zostera marina

Photosynthetic capacity

Photoinhibition

10.1007/s00227-002-0806-9

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Citations (100)

Ecological effects of non‐native species in marine ecosystems relate to co‐occurring anthropogenic pressures

Global Change Biology (2019)

Nathan R. Geraldi Andrea Antón Julia Santana‐Garcon Scott Bennett Núria Marbà

Abstract Predictors for the ecological effects of non‐native species are lacking, even though such knowledge is fundamental to manage non‐native species and mitigate their impacts. Current theories suggest that the ecological effects of non‐native species may be related to other concomitant anthropogenic stressors, but this has not been tested at a global scale. We combine an exhaustive meta‐analysis of the ecological effects of marine non‐native species with human footprint proxies to determine whether the ecological changes due to non‐native species are modulated by co‐occurring anthropogenic impacts. We found that non‐native species had greater negative effects on native biodiversity where human population was high and caused reductions in individual performance where cumulative human impacts were large. On this basis we identified several marine ecoregions where non‐native species may have the greatest ecological effects, including areas in the Mediterranean Sea and along the northwest coast of the United States. In conclusion, our global assessment suggests coexisting anthropogenic impacts can intensify the ecological effects of non‐native species.

10.1111/gcb.14930

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Citations (25)

Global biodiversity patterns of marine forests of brown macroalgae

Figshare (2021)

Eliza Fragkopoulou Ester Á. Serrão Olivier De Clerck Mark J. Costello Miguel B. Araújo

S1. List of modelled species and individual number of records.S2. Predictive performance per modelled species.S3. Contribution of environmental predictors and apparent physiological thresholds per species.S4. Collinearity analyses between environmental predictors.S5. Predicted species richness per family and suitable habitat areas for fucoid and kelp per realm as defined by Spalding et al., (2007).S6. List of predicted species of kelp per ecoregion as defined by Spalding et al., (2007).S7. List of predicted species of fucoids per ecoregion as defined by Spalding et al., (2007).S8. Predictive layers per species and stacked as global estimates of potential species richness

Marine Biodiversity

10.6084/m9.figshare.14496018.v2

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Sediment Stocks of Carbon, Nitrogen, and Phosphorus in Danish Eelgrass Meadows

Frontiers in Marine Science (2018)

Theodor Kindeberg Sarah B. Ørberg Maria Emilia Röhr Marianne Holmer Dorte Krause‐Jensen

Seagrass ecosystems provide an array of ecosystem services ranging from habitat provision to erosion control. From a climate change and eutrophication mitigation perspective, the ecosystem services include burial and storage of carbon and nutrients in the sediments. Eelgrass (Zostera marina) is the most abundant seagrass species along the Danish coasts, and while its function as a carbon and nutrient sink has been documented in some areas, the spatial variability of these functions, and the drivers behind them, are not well understood. Here we present the first nationwide study on eelgrass sediment stock of carbon (Cstock), nitrogen (Nstock), and phosphorus (Pstock). Stocks were measured in the top 10 cm of eelgrass meadows spanning semi-enclosed estuaries (inner and outer fjords) to open coasts. Further, we assessed environmental factors (level of exposure, sediment properties, level of eutrophication) from each area to evaluate their relative importance as drivers of the spatial pattern in the respective stocks. We found large spatial variability in sediment stocks, representing 155-4413 g C m-2, 24-448 g TN m-2, and 7-34 g TP m-2. Cstock and Nstock were significantly higher in inner fjords compared to outer fjords and open coasts. Cstock, Nstock, and Pstock showed a significantly positive relationship with the silt-clay content in the sediments. Moreover, Cstock was also significantly higher in more eutrophied areas with high concentrations of nutrients and chlorophyll a (chl a) in the water column. Conversely, silt-clay content was not related to nutrients or chl a, suggesting a spatial dependence of the importance of these factors in driving stock sizes and implying that local differences in sediment properties and eutrophication level should be included when evaluating the storage capacity of carbon, nitrogen, and phosphorus in Danish eelgrass meadows. These insights provide guidance to managers in selecting priority areas for carbon and nutrient storage for climate- and eutrophication mitigation initiatives.

Zostera marina

Fjord

Silt

10.3389/fmars.2018.00474

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Citations (46)

Global biodiversity patterns of marine forests of brown macroalgae

Global Ecology and Biogeography (2022)

Eliza Fragkopoulou Ester Á. Serrão Olivier De Clerck Mark J. Costello Miguel B. Araújo

Abstract Aim Marine forests of brown macroalgae create essential habitats for coastal species and support invaluable ecological services. Here, we provide the first global analysis of species richness and endemicity of both the kelp and fucoid biomes. Location Global. Time period Contemporary. Major taxa studied Marine forests of brown macroalgae, formed by kelp (here defined as orders Laminariales, Tilopteridales and Desmarestiales) and fucoid (order Fucales), inhabiting subtidal and intertidal environments. Methods We coupled a large dataset of macroalgal observations (420 species, 1.01 million records) with a high‐resolution dataset of relevant environmental predictors (i.e., light, temperature, salinity, nitrate, wave energy and ice coverage) to develop stacked species distribution models (stacked SDMs) and yield estimates of global species richness and endemicity. Results Temperature and light were the main predictors shaping the distribution of subtidal species, whereas wave energy, temperature and salinity were the main predictors of intertidal species. The highest regional species richness for kelp was found in the north‐east Pacific (maximum 32 species) and for fucoids in south‐east Australia (maximum 53 species), supporting the hypothesis that these regions were the evolutionary sources of global colonization by brown macroalgae. Locations with low species richness coincided between kelp and fucoid, occurring mainly at higher latitudes (e.g., Siberia) and the Baltic Sea, where extensive ice coverage and low‐salinity regimes prevail. Regions of high endemism for both groups were identified in the Galapagos Islands, Antarctica, South Africa and East Russia. Main conclusions We estimated the main environmental drivers and limits shaping the distribution of marine forests of brown macroalgae and mapped biogeographical centres of species richness and endemicity, which largely coincided with the expectation from previous evolutionary hypotheses. The mapped biodiversity patterns can serve as new baselines for planning and prioritizing locations for conservation, management and climate change mitigation strategies, flagging threatened marine forest regions under different climate change scenarios.

Kelp forest

Fucales

Intertidal ecology

Endemism

Biome

10.1111/geb.13450

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Citations (63)

Effects of filamentous macroalgae on growth and survival of eelgrass, Zostera marina , seedlings

Jonas Ribergaard Rasmussen Dorte Krause‐Jensen Birgit Olesen

Zostera marina

Zostera

Source

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Testing relationships between macroalgal cover and Secchi depth in the Baltic Sea

Ecological Indicators (2009)

Dorte Krause‐Jensen Jacob Carstensen Karsten Dahl Saara Bäck Samuli Neuvonen

Lake ecosystem

Baltic sea

Secchi disk

10.1016/j.ecolind.2009.02.010

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Citations (23)

High Biomass of Floating Macroalgae Supports Carbon Sequestration Potential within and Beyond a Greenland Fjord

SSRN Electronic Journal (2022)

Thomas Gjerluff Ager Dorte Krause‐Jensen Mikael K. Sejr Birgit Olesen Daniel F. Carlson

Despite growing attention to the potential contribution of macroalgae to Blue Carbon, there is a gaping lack of evidence of their export to carbon sinks in the deep ocean and marine sediments. In this study, we quantified the annual carbon export of floating macroalgae in a large sub-arctic fjord system, Nuup Kangerlua, Greenland, from April to August 2021 and trajectories of exported biomass within and beyond the fjord. We identified extensive macroalgae communities within the fjord system, which sustained 55.44 kg wet weight km -2 of floating macroalgal biomass on average in the fjord system. Using GPS drifters we identified transport pathways and the likelihood of macroalgal export out of the fjord to sinks in the deep ocean. The annual export of floating macroalgae beyond the fjord amounted to 445.73 t C yr -1 . Our observation suggests that most of the floating biomass is retained in the fjord where its fate in relation to long-term sequestration is unknown. The floating macroalgal biomass was composed of intertidal macroalgae species (58%) ( Fucus vesiculosus, Fucus distichus, and Ascophyllum nodosum) , and kelps (42%) ( Alaria esculenta , Saccharina latissima & Saccharina longicruris) . Macroalgae densities and species composition varied seasonally with the highest levels after storms. Dominance of intertidal species in the spring suggests that ice scouring related to ice melt is an important driver of export. Sea urchin barrens occupied 15% of the potential macroalgae habitats of the fjord and, hence, limited standing biomass and associated blue carbon potential.

Fjord

Carbon fibers

10.2139/ssrn.4246828

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Air‐water exchange and vertical profiles of organic carbon in a subarctic fjord

Limnology and Oceanography (2010)

Sergio Ruíz‐Halpern Mikael K. Sejr Carlos M. Duarte Dorte Krause‐Jensen Tage Dalsgaard

In this article, we examine the air‐sea exchange of exchangeable organic carbon (OC) as well as the internal pools and sources within a subarctic fjord. Air‐water fluxes of OC ranged from an uptake of 22 ± 10 mmol C m −2 d −1 in winter to a release of 2 ± 8 mmol C m −2 d −1 in the fall, sizable compared to that of CO 2 (average uptake of 136 mmol C m −2 d −1 for the fall and 2.6 ± 0.84 mmol C m −2 d −1 in the winter). The water column profiles of exchangeable dissolved organic carbon (EDOC) followed closely those of dissolved organic carbon (DOC), and EDOC represented, on average, about one‐third of DOC. The dynamic characteristic and active cycling of EDOC was evidenced by incubation experiments performed on each fjord compartment (sediment, water column, macroalgae) where sediments and macroalgae were found to be substantial sources and the water column acted as a strong sink of EDOC.

Subarctic climate

Fjord

Carbon fibers

Sink (geography)

10.4319/lo.2010.55.4.1733

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Citations (26)