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Home NEWS Science News Biology

Study shows six decades of change in plankton communities

Bioengineer by Bioengineer
April 2, 2020
in Biology
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Credit: Marine Biological Association

The UK’s plankton population – microscopic algae and animals which support the entire marine food web – has undergone sweeping changes in the past six decades, according to new research published in Global Change Biology.

Involving leading marine scientists from across the UK, led by the University of Plymouth, the research for the first time combines the findings of UK offshore surveys such as the Continuous Plankton Recorder (CPR) and UK inshore long-term time-series.

It then maps those observations against recorded changes in sea surface temperature, to demonstrate the effect of our changing climate on these highly sensitive marine communities.

The study’s authors say their findings provide further evidence that increasing direct human pressures on the marine environment – coupled with climate-driven changes – are perturbing marine ecosystems globally.

They also say it is crucial to helping understand broader changes across UK waters, since any shifts in plankton communities have the potential for negative consequences for the marine ecosystem and the services it provides.

Since plankton are the very base of the marine food web, changes in the plankton are likely to result in changes to commercial fish stocks, sea birds, and even the ocean’s ability to provide the oxygen we breathe.

The analyses of plankton functional groups showed profound long-term changes, which were coherent across large geographical areas right around the UK coastline.

For example, the 1998-2017 decadal average abundance of meroplankton, a group of animal plankton, which includes lobsters and crabs and which spend their adult lives on the seafloor, was 2.3 times that for 1958-1967 when comparing CPR samples in the North Sea, at a time of increasing sea surface temperatures.

This contrasted with a general decrease in plankton which spend their whole lives in the water column, while other offshore species noticed population decreases of around 75%.

The study was led by former postdoctoral researcher Dr Jacob Bedford and Dr Abigail McQuatters-Gollop, from the University of Plymouth’s Marine Conservation Research Group. It also involved scientists from The Marine Biological Association, Plymouth Marine Laboratory, The Environment Agency, Marine Scotland Science, Centre for Environment Fisheries and Aquaculture Science (Cefas), Agri-Food & Biosciences Institute of Northern Ireland, and the Scottish Association for Marine Science.

Dr McQuatters-Gollop, the lead scientist for pelagic habitats policy for the UK, said: “Plankton are the base of the entire marine food web. But our work is showing that climate change has caused plankton around UK waters to experience a significant reorganisation. These changes in the plankton suggest alterations to the entire marine ecosystem and have consequences for marine biodiversity, climate change (carbon cycling) and food webs including commercial fisheries.”

Dr Clare Ostle, of the Marine Biological Association’s Continuous Plankton Recorder (CPR) Survey, said: “Changes in plankton communities not only affect many levels of marine ecosystems but also the people that depend on them, notably through the effects on commercial fish stocks. This research is a great example of how different datasets – including CPR data – can be brought together to investigate long-term changes in important plankton groups with increasing temperature. These kind of collaborative studies are important for guiding policy and assessments of our changing environment.”

Report co-author Professor Paul Tett, from the Scottish Association for Marine Science (SAMS) in Oban, added: “In this paper, we have tried to turn decades of speculation into evidence. It has long been thought that warming seas impact on plankton, the most important organisms in the marine food web. By bringing together such a large, long-term dataset from around the UK for the first time, we have discovered that the picture is a complex one. We therefore need to build on the success of this collaboration by further supporting the Continuous Plankton Recorder and the inshore plankton observatories.”

###

Media Contact
Alan Williams
[email protected]

Original Source

https://www.plymouth.ac.uk/news/study-shows-six-decades-of-change-in-uks-plankton-communities

Related Journal Article

http://dx.doi.org/10.1111/gcb.15066

Tags: BiologyClimate ChangeEcology/EnvironmentMarine/Freshwater Biology
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