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  • 1
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    Unknown
    Abundance and biomass of Arctic benthic species (2023)
    PANGAEA
    Details
    Publication Date: 2023-10-16
    Description: While the Arctic may be an inhospitable environment at the surface, the benthos is teaming with life. Even though this wealth of life is known to exist, information on the presence of benthic species at a pan-Arctic scale is scarce. To address this shortfall, abundance and biomass data from eighteen studies spanning the Arctic (i.e. Alaska, Canada, Svalbard, and Russia) were collected and merged into a single dataset. The collected species records range from 1970 to 2017. Because the rates of sampling are not always available it should be inferred that the species can be considered to likely be present between the start and end dates provided. If the day of sampling is the first of the month, it is generally because only the year and month were provided. The methods of sampling included here are: photography, diving collection, Van Veen grab, multinet, trawl, and sediment core. Species records taken along a transect are given with the minimum and maximum depths. The taxonomies provided are based on data from World Register of Marine Species website (WORMS). Biomass is given in gram ash free dry weight (AFDW) per square meter, carbon (C) gram per square meter, or gram wet weight (ww) per square meter. Abundance is given in number of individuals per square meter. Standard deviations for all measurements are given in the same units.
    Keywords: Abundance; Abundance, standard deviation; Abundance per area; Arctic; Benthic; Biodiversity; Biomass; Biomass, ash free dry mass, standard deviation; Biomass, ash free dry mass per area; Biomass, wet mass, standard deviation; Biomass, wet mass per area; Biomass as carbon per area; Calculated; Class; Counted; Cruise/expedition; Data collection methodology; Date/time end; Date/time start; DEPTH, sediment/rock; Depth, sediment/rock, bottom/maximum; Depth, sediment/rock, top/minimum; Family; Genus; Kingdom; LATITUDE; LONGITUDE; Order; Phylum; Principal investigator; Replicate; Species; Species, unique identification (Semantic URI); Species, unique identification (URI); Uniform resource locator/link to source data file; Weighted
    Type: Dataset
    Format: text/tab-separated-values, 90539 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
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    Measurements of An Autonomous Flow through Salinity and Temperature Perturbation Mesocosm System for a Multi-stressor Experiment (2023)
    PANGAEA
    Details
    Publication Date: 2023-11-02
    Description: An ex situ experimental mesocosm system was employed to test the effects of climate change drivers temperature, salinity, and reduced light on Arctic kelp communities in Ny-Ålesund, Svalbard from 03/07/2021 –26/08/2021. Three experimental conditions (with 3x replicates) manipulating temperature and salinity as offset values from a dynamic real-time control condition were used to increase temperature on the order of +3.3 and +5.3 °C, freshening by a decrease of ~ 4 and ~ 5 in salinity, along with a static irradiance attenuation at 30 and 50 %. In each mesocosm, oxygen (% O2, temperature, salinity, and flow rate were monitored minutely for 2 months using in situ optical and conductivity sensors paired with flow meters plumbed to the incoming water line. Data were logged on a microSD card. The collected environmental temperature and salinity data were paired with O2 concentration measured during closed incubations which occurred weekly over the experimental period to assess the effects on kelp community metabolism.
    Keywords: Climate change; Conductivity digital sensor, Aqualabo, PC4E; DATE/TIME; ecosystems; experimental system; Flow rate; MESO; Mesocosm experiment; multi-stressors; Ny_Ålesund_Mesocosm_2021; Ny-Ålesund, Spitsbergen; Oxygen Optical digital sensor, Aqualabo, PODOC; Oxygen saturation; Replicate; Salinity; Temperature, water; Vortex flow meter, ifm electronic gmbh, SV3150
    Type: Dataset
    Format: text/tab-separated-values, 4455303 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 3
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    Unknown
    Response of Arctic mixed kelp communities in northern Norway to simulated heatwaves: a mesocosm study as per minute record (2024)
    PANGAEA
    Details
    Publication Date: 2024-04-23
    Description: Arctic marine ecosystems are experiencing rapid environmental change with respect to warming. This is leading to an increased frequency, duration, and intensity of marine heatwaves. The impact of these stochastic heatwave events have the potential to negatively effect temperature-sensitive, habitat forming, kelp, that exist in the lower Arctic region. We tested the potential impacts of two heatwave events on mixed kelp communities occurring in the lower Arctic by conducting a 1-month ex situ mesocosm experiment in Tromsø, Norway. Each mesocosm was stocked with ~ 2.5 kg fw (fresh weight) of kelp, 200 g fw of snails and mussels, and ~ 750 g of sea urchins. Three experimental conditions were tested: a constant high temperature which was + 1.76°C above a dynamic control, and two heatwave scenarios. Scenario 1 was a long duration at + 2.8°C above the control for 2 weeks, and scenario 2 was a high frequency and magnitude treatment with conditions + 3.8°C above the control. This occurred at two peaks that were one weak apart and returned to + 1.76°C in-between. Three-hour incubations were performed to examine net community productivity (NCP) for the mixed kelp communities. We identified that both heatwave scenarios diminished the total gross production over the experimental period compared to the control and between scenario 1 and scenario 2. Scenario 1 appeared to exhibit the lowest total gross community production over the experimental period.
    Keywords: Analysis date/time, experiment; Arctic Biodiversity & Livelihoods; Climate change; Conductivity digital sensor, Aqualabo, PC4E; ecosystems; Experiment; FACE-IT; Incubation duration; kelp; marine heatwaves (MHWs); MESO; Mesocosm experiment; Net community production; Oxygen; Oxygen Optical digital sensor, Aqualabo, PODOC; Photosynthetic Active Radiation Logger (PAR), Odyssey®; Radiation, photosynthetically active per minute; Replicates; Treatment; Treatment: salinity; Treatment: temperature; Tromsø_Mesocosm_2022; Tromsø, Norway
    Type: Dataset
    Format: text/tab-separated-values, 196010 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 4
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    Wind-driven upwelling of iron sustains dense blooms and food webs in the eastern Weddell Gyre. (2023)
    Details
    Publication Date: 2023-09-24
    Description: The Southern Ocean is a major sink of anthropogenic CO2 and an important foraging area for top trophic level consumers. However, iron limitation sets an upper limit to primary productivity. Here we report on a considerably dense late summer phytoplankton bloom spanning 9000 km2 in the open ocean of the eastern Weddell Gyre. Over its 2.5 months duration, the bloom accumulated up to 20 g C m−2 of organic matter, which is unusually high for Southern Ocean open waters. We show that, over 1997–2019, this open ocean bloom was likely driven by anomalies in easterly winds that push sea ice southwards and favor the upwelling of Warm Deep Water enriched in hydrothermal iron and, possibly, other iron sources. This recurring open ocean bloom likely facilitates enhanced carbon export and sustains high standing stocks of Antarctic krill, supporting feeding hot spots for marine birds and baleen whales.
    Description: Challenge 4. 9
    Description: Published
    Description: Refereed
    Keywords: Primary production ; Phytoplankton bloom
    Repository Name: AquaDocs
    Type: Journal Contribution
    Location Call Number Expected Availability
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    PAPER (OA)
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