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Primary Production01:06

Primary Production

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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: Dec 22, 2025

Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis
10:16

Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis

Published on: December 16, 2016

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Seafloor microplastic hotspots controlled by deep-sea circulation.

Ian A Kane1, Michael A Clare2, Elda Miramontes3,4

  • 1School of Earth and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK. ian.kane@manchester.ac.uk.

Science (New York, N.Y.)
|May 2, 2020
PubMed
Summary

This study explores how microplastics accumulate on the seafloor and finds that deep-sea currents play a major role. The researchers collected sediment samples and measured bottom currents to test their hypothesis. They discovered that thermohaline-driven currents can create hotspots with extremely high microplastic concentrations. One site had 190 microplastic pieces per 50 grams of sediment, the highest reported in any seafloor setting. The study suggests that these currents trap microplastics rather than spread them out. The findings challenge the idea that microplastics settle uniformly from the surface. The researchers also note that the same currents that support deep-sea life may also deliver microplastics to these areas. This study provides new insight into how oceanographic processes influence pollution patterns in the deep sea.

Keywords:
microplastic seafloor distributiondeep-sea sediment analysisthermohaline currentsmarine pollution hotspots

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Area of Science:

  • Marine environmental science
  • Oceanographic fluid dynamics
  • Marine pollution research

Background:

Microplastics are now recognized as a widespread contaminant in marine environments. However, the mechanisms that govern their accumulation on the seafloor remain unclear. It was already known that surface microplastics can sink to the deep sea, but the factors that determine their final distribution were not fully understood. Some researchers have suggested that vertical transport from the surface is the main pathway. Yet, no prior work had resolved how seafloor currents might influence microplastic deposition. This gap motivated the need to investigate the role of deep-sea circulation in microplastic distribution. Understanding this process is essential for predicting where microplastics are most concentrated. The deep sea remains one of the least studied regions of the planet. This uncertainty drove the current study to explore the connection between ocean currents and microplastic hotspots.

Purpose Of The Study:

The aim of this research was to determine how deep-sea currents influence the distribution of microplastics on the seafloor. The study focused on thermohaline-driven bottom currents, which are known to transport sediments and nutrients. These currents may also affect the movement of microplastics. The researchers sought to test whether these currents create areas of high microplastic concentration. They hypothesized that bottom currents could concentrate microplastics in specific locations. This would explain the formation of hotspots. The study aimed to provide evidence for this mechanism. By linking oceanographic processes to microplastic accumulation, the research could help improve pollution models.

Main Methods:

The researchers collected sediment samples from various locations in the deep sea. These samples were analyzed for microplastic content and particle size. They also measured the strength and direction of bottom currents at each sampling site. The team used oceanographic models to simulate how these currents might transport microplastics. They compared the observed microplastic concentrations with the model predictions. This allowed them to test the hypothesis that bottom currents control microplastic distribution. The study combined field measurements with computational analysis. The researchers focused on thermohaline-driven currents as the primary mechanism.

Main Results:

The study found that microplastic concentrations were highest in areas with strong bottom currents. One site had 190 microplastic pieces per 50 grams of sediment, the highest reported for any seafloor setting. These hotspots were located in regions where thermohaline currents converge. The data suggest that these currents trap microplastics rather than disperse them. The model simulations supported this finding. The researchers observed a clear correlation between current patterns and microplastic distribution. The results indicate that vertical settling alone cannot explain the observed concentrations. The study provides direct evidence that bottom currents shape microplastic hotspots.

Conclusions:

The authors propose that thermohaline-driven bottom currents are a key factor in microplastic accumulation on the seafloor. These currents may create localized hotspots by concentrating microplastics in specific areas. The study suggests that regions with high biodiversity may also have high microplastic concentrations. This is because the same currents that support deep-sea life also transport microplastics. The findings challenge the assumption that microplastics settle uniformly from the surface. The researchers emphasize that deep-sea circulation plays a central role in microplastic distribution. Their results provide a new framework for understanding seafloor pollution. The study highlights the need to consider oceanographic processes when assessing microplastic risks.

Thermohaline-driven bottom currents can trap microplastics in specific areas, creating hotspots with up to 190 pieces per 50 grams of sediment.

These currents are shown to control the spatial distribution of microplastics by concentrating them in regions with high sediment accumulation.

Bottom currents may trap microplastics rather than disperse them, leading to localized areas of high concentration.

The same currents that supply nutrients to deep-sea ecosystems may also transport microplastics, suggesting that biodiversity hotspots could also be pollution hotspots.

The highest concentration found was 190 microplastic pieces per 50 grams of sediment.

The authors propose that bottom currents, not just vertical settling, are a major factor in microplastic distribution on the seafloor.