Antarctica more widely impacted by climate change than previously thought

Antarctica more widely impacted by climate change than previously thought
Figure: Two hundred years of human activity on the Antarctic continent. The black dots and lines represent human activity including traverses across the ice. The grey scale squares indicate areas where data suggest humans have not yet travelled. Credit: Tilburg University

Antarctica is considered one of the Earth's largest, most pristine remaining wildernesses. Yet since its formal discovery 200 years ago, the continent has seen accelerating human activity. Reporting in the journal Nature, a research team including Tilburg University show where human activities have been conducted and uncover two main concerns: wilderness in Antarctica is decreasing due to an increasing "human footprint" and biodiversity is under pressure because species mainly depend on areas that are strongly influenced by humans. However, much opportunity exists to take swift action.

How widespread this is across the Antarctic continent has never been quantified. We know Antarctica has no cities, agriculture or industry. But we have never had a good idea of where humans have been, how much of the continent remains untouched or largely unimpacted, and to what extent these largely unimpacted areas serve to protect biodiversity.

A team of researchers led by Monash University has changed all of that. Reporting on 15 July 2020 in the journal Nature, using a data set of 2.7 million human activity records, they show just how extensive human use of Antarctica has been over the last 200 years.

With the exception of some large areas mostly in the central parts of the continent, humans have set foot almost everywhere.

Although many of these visited areas have only been negligibly affected by people, biodiversity is not as well represented within them as it should be.

Only 16% of the continent's Important Bird Areas, areas identified internationally as critical for bird conservation, are located within negligibly impacted areas. And little of the total negligibly impacted area is represented in Antarctica's Specially Protected Area network.

High human impact areas, for example some areas where people build research stations or visit for tourism, often overlap with areas important for biodiversity.

Lead author, Rachel Leihy, a Ph.D. student in the Monash School of Biological Sciences, points out that "While the situation does not look promising initially, the outcomes show that much opportunity exists to take swift action to declare new protected areas for the conservation of both wilderness and ."

Steven Chown, the corresponding author based at Monash University, adds "Informatics approaches using large data sets are providing new quantitative insights into questions that have long proven thorny for environmental policymakers. This work offers innovative ways to help the Antarctic Treaty Parties take forward measures to secure Antarctica's Wilderness."

Kees Bastmeijer, who works at Tilburg Law School, participated from a legal perspective: "Wilderness values in Antarctica have a protected status under international law, but the 29 states that jointly manage Antarctica (including the Netherlands) are struggling to implement this. This research is an important incentive to stop the ever-increasing human footprint in Antarctica."

The transdisciplinary team delivering this work includes researchers from Australia, the Netherlands, New Zealand, and South Africa.


Explore further

Humans are encroaching on Antarctica's last wild places, threatening its fragile biodiversity

More information: Rachel I. Leihy et al. Antarctica's wilderness fails to capture continent's biodiversity, Nature (2020). DOI: 10.1038/s41586-020-2506-3
Journal information: Nature

Provided by Tilburg University
Citation: Antarctica more widely impacted by climate change than previously thought (2020, July 16) retrieved 21 September 2020 from https://phys.org/news/2020-07-antarctica-widely-impacted-climate-previously.html
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