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Primary Production01:06

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The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
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Related Experiment Video

Updated: May 12, 2025

Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis
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Microplastic pellets in Arctic marine sediments: a common source or a common process?

France Collard1, Ingeborg G Hallanger2, Carolin Philipp2

  • 1Norwegian Polar Institute, Fram Centre, 9296-Tromsø, Norway; Norwegian Institute for Water Research (NIVA), Fram Centre, 9296-Tromsø, Norway.

Environmental Research
|May 7, 2025
PubMed
Summary

Microplastic (MP) contamination in the Barents Sea was investigated. MPs were found in sediments, with higher concentrations near sea ice, not at greater depths or near settlements, suggesting varied sources.

Keywords:
Barents SeaRaman spectroscopymarine snowmicroplasticsplastic pollutionpyrolysis-GC/MS

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Area of Science:

  • Marine Biology
  • Environmental Science
  • Oceanography

Background:

  • Increasing global plastic consumption leads to significant marine pollution, with plastic debris accumulating on the seafloor.
  • The Arctic marine environment, including the Barents Sea, is known to be contaminated with microplastics (MPs), but their distribution and fate remain poorly understood.

Purpose of the Study:

  • To assess microplastic accumulation in the Barents Sea sediments at varying water depths and proximity to human settlements.
  • To investigate the ubiquity and potential sources of specific plastic pellet types found in Arctic sediments.

Main Methods:

  • Collection of surface sediment samples from seven stations around Svalbard using a box-corer.
  • Extraction of microplastics via density separation using saturated saltwater.
  • Compositional analysis of plastic pellets using pyrolysis-GC/MS and microRaman spectroscopy.

Main Results:

  • An average concentration of 3.61 ± 1.45 MPs/100 g (dry weight) was detected in the sediments.
  • The sea ice station exhibited higher MP contamination and a different MP profile compared to other locations.
  • Contrary to expectations, deeper stations and areas near Longyearbyen settlement did not show elevated MP concentrations.

Conclusions:

  • Microplastic distribution in the Barents Sea is complex, with sea ice proximity potentially influencing accumulation.
  • The depth and proximity to settlements were not primary drivers of MP concentration in this study.
  • Ubiquitous dark pellets composed of various polymers suggest a common origin, possibly linked to marine snow formation.