[OANNES Foro] Scientific databases contain little information on pollution in marine conservation areas

[Mario Cabrejos]

Scientists decry lack of data on ocean pollution

By:  <https://www.scidev.net/global/author.rodrigo-de-oliveira-andrade.html>
Rodrigo de Oliveira Andrade

13/12/18

https://www.scidev.net/global/conservation/news/scientists-decry-lack-of-dat
a-on-ocean-pollution.html?utm_medium=email&utm_source=SciDevNewsletter&utm_c
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[SÃO PAULO] Scientific databases contain little information on pollution in
marine  <https://www.scidev.net/global/environment/conservation/>
conservation areas, according to a broad review of research on chemical
<https://www.scidev.net/global/environment/pollution/> pollution and its
biological effects on the ocean.

A team of researchers in Brazil found just 1,291 scientific papers on such
pollution, even though litter and toxic spillages in marine protected areas
are among the main threats to ocean wildlife conservation. When the
researchers undertook a proper content analysis of the articles, only 96
papers remained that thoroughly studied the problem, covering just 0.6 per
cent of all marine protected areas around the world.

The studies reported problems with the sites they analysed, but levels of
information on pollution were usually insufficient to correctly diagnose
threats and support further actions a review,
<https://www.sciencedirect.com/science/article/pii/S0269749118303488>
published in Environmental Pollution, pointed out.

“On face of it, we cannot estimate long-term effects of pollution in these
sites, nor compare pollution to other known threats to marine protected
areas,” says Denis Moledo de Souza, an oceanographer at the State University
of Sao Paulo and lead author of a study.

He explains that, in the complex oceanic ecosystem, contaminants are likely
to act in tandem with other stressors, making it hard to pin down a single
cause for wildlife deterioration. “We may only speculate that the outcome of
such interactions is the loss of species and the decline of ecosystems
within marine protected areas,” he points out.
 
According to the paper, there are 13,674 marine protected areas spread out
across the globe. These sites are usually created to protect or restore
marine habitats, biodiversity, ecological processes and to help maintain
fishery productivity. This, in turn, may reduce biodiversity loss and
improve economic activity, as well as boosting sustainable development.

Yet, the World Wildlife Fund estimates that only 4 per cent of the world’s
oceans are protected, and most of existing marine parks and reserves are
either poorly managed or not looked after at all.

“Marine protected areas conservation would be effective only if it is
managed properly, if stressors are controlled and if data are available to
properly assess management policies,” Souza highlights. “This includes
information on pollution caused by chemical substances released into the
sea.”

Alexander Turra, an oceanographer at the University of Sao Paulo’s
Oceanographic Institute, agrees that systematic studies on marine
conservation units are rare and that such monitoring is usually not part of
their management policies.

“It tends to hamper researchers working on the evaluation of the quality of
marine conservation units and whether they are reaching the goals for which
they have been created”, he tells SciDev.Net.

Turra adds that marine protected areas are not immune to contamination, even
if they are located far from a source of pollution. That is because
pollutants are able to travel long distances in the water and are carried
along by tides and ocean currents.

 

The main pollution sources that threaten ocean health include sewage,
mining, urban drainage, sediment dredging and disposal, oil exploitation and
spills, marinas and factories using sea water.

Hudson Pinheiro, an ichthyologist at the California Academy of Sciences in
the United States, says that activities with high pollution potential are
heavily regulated in developed countries, as their ecological impacts have
been known for a long time. “However, in developing countries, even knowing
the potential polluter, environmental requirements are weaker and
consequently the environment and society end up paying the price,” he tells
SciDev.Net.

To address the problem, Turra suggests that marine protected areas should
work closely with local universities and research centres. This would help
them “draw up proper management plans and systematic evaluations of their
conservation status”, he says.

 



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