Reindeer Numbers Have Fallen by More than Half in 2 Decades
It's a sad Christmas for the world's reindeer—the antlered Arctic grazers associated with all things Santa Claus. Their numbers have fallen by more than half in the past 20 years, and climate change is likely to blame.
The latest numbers come from the National Oceanic and Atmospheric Administration's 2018 Arctic Report Card, which listed the increasing impacts of global warming on the earth's northernmost region, as EcoWatch has already reported. But the loss of Rangifer tarandus—called caribou in North America and Greenland and reindeer in Siberia and Europe—is of note because it threatens to further throw Arctic ecosystems and cultures out of whack. Reindeer are important prey for wolves and biting flies, and a key source of food and clothing for indigenous groups.
"If you look at the [top] Northern resources, that shape the culture of northern communities and aboriginal people, what they have in common is caribou and or wild reindeer, no matter where they are in the circumpolar North," Don Russell, lead author of the Report Card's essay on reindeer, told Vox.
Locations of the major caribou or reindeer herds across the ArcticNOAA
The report found that reindeer and caribou herds have declined by 56 percent in the past two decades—that's a decrease of 2.6 million reindeer from a population of 4.7 million to a population of 2.1 million. Five herds in Alaska and Canada were particularly at risk: their populations have declined by more than 90 percent and showed no signs of rebounding. While it is normal for caribou and reindeer herds to swell and shrink, some herds are at all-time lows since record-keeping began.
"The fact that these herds are declining shouldn't be a shock—they do it all the time," Russell told Vox. "But they're at such low levels, you start to be concerned ... If we return in 10 years and [their numbers] have gone down further, that would be unprecedented."
Current vs. peak estimates for the size of reindeer/ caribou herds.NOAA
Scientists don't know exactly what is causing the decline in herd numbers, but it is likely a variety of climate-linked factors caused by warmer summers and winters.
- Food Shortage: Caribou subsist on lichen, which grows on the ground. But warmer temperatures encourage taller plants to grow. "Warming means other, taller vegetation is growing and the lichen are being out-competed," University of Virginia environmental science professor Howard Epstein, who helped with the research behind the report, told BBC News.
- Bug Off: Warmer weather also means more insects. The caribou then spend their energy hiding from them or fending them off, instead of looking for food. "It's said that a nice day for people is a lousy day for caribou," Epstein told BBC News.
- Rainy Days: Warmer winters, on the other hand, mean more rain falls than snow. The rain then freezes into a layer of ice that the reindeer cannot break through to reach food, BBC News explained. In one incident in 2013, ice cover in Russia meant that 61,000 reindeer starved to death, Vox reported.
Long-term #Arctic warming trends may be contributing to a 56% drop in #caribou and #reindeer populations over the l… https://t.co/tfPbnlG9at— NOAA Research (@NOAA Research)1544542274.0
These factors have been shown to impact individual herds. Warmer Julys and freezing rain from September to December were shown to explain 64 percent of the variability in adult caribou cow survival in the herd in Bathurst, Canada, the report said.
Editor's note: This post has been updated for clarity. Reindeer population figures have been added to the percentages.
Scientists Stunned by Off-the-Charts Arctic Temperatures, Record-Low Sea Ice https://t.co/dPCr7fVIuC @ecowatch— Sierra Club (@Sierra Club)1519763407.0
- Redwoods are the world's tallest trees.
- Now scientists have discovered they are even bigger than we thought.
- Using laser technology they map the 80-meter giants.
- Trees are a key plank in the fight against climate change.
They are among the largest trees in the world, descendants of forests where dinosaurs roamed.
Pixabay / Simi Luft<p><span>Until recently, measuring these trees meant scaling their 80 meter high trunks with a tape measure. Now, a team of scientists from University College London and the University of Maryland uses advanced laser scanning, to create 3D maps and calculate the total mass.</span></p><p>The results are striking: suggesting the trees <a href="https://www.nature.com/articles/s41598-020-73733-6" target="_blank" rel="noopener noreferrer">may be as much as 30% larger than earlier measurements suggested.</a> Part of that could be due to the additional trunks the Redwoods can grow as they age, <a href="https://www.nature.com/articles/s41598-020-73733-6" target="_blank" rel="noopener noreferrer">a process known as reiteration</a>.</p>
New 3D measurements of large redwood trees for biomass and structure. Nature / UCL<p>Measuring the trees more accurately is important because carbon capture will probably play a key role in the battle against climate change. Forest <a href="https://www.wri.org/blog/2020/09/carbon-sequestration-natural-forest-regrowth" target="_blank">growth could absorb billions of tons</a> of carbon dioxide from the atmosphere each year.</p><p>"The importance of big trees is widely-recognised in terms of carbon storage, demographics and impact on their surrounding ecosystems," the authors wrote<a href="https://www.nature.com/articles/s41598-020-73733-6" target="_blank"> in the journal Nature</a>. "Unfortunately the importance of big trees is in direct proportion to the difficulty of measuring them."</p><p>Redwoods are so long lived because of their ability to <a href="https://www.nature.com/articles/s41598-020-73733-6" target="_blank" rel="noopener noreferrer">cope with climate change, resist disease and even survive fire damage</a>, the scientists say. Almost a fifth of their volume may be bark, which helps protect them.</p>
Carbon Capture Champions<p><span>Earlier research by scientists at Humboldt University and the University of Washington found that </span><a href="https://www.sciencedirect.com/science/article/pii/S0378112716302584" target="_blank" rel="noopener noreferrer">Redwood forests store almost 2,600 tonnes of carbon per hectare</a><span>, their bark alone containing more carbon than any other neighboring species.</span></p><p>While the importance of trees in fighting climate change is widely accepted, not all species enjoy the same protection as California's coastal Redwoods. In 2019 the world lost the equivalent of <a href="https://www.worldwildlife.org/threats/deforestation-and-forest-degradation" target="_blank" rel="noopener noreferrer">30 soccer fields of forest cover every minute</a>, due to agricultural expansion, logging and fires, according to The Worldwide Fund for Nature (WWF).</p>
Pixabay<p>Although <a href="https://c402277.ssl.cf1.rackcdn.com/publications/1420/files/original/Deforestation_fronts_-_drivers_and_responses_in_a_changing_world_-_full_report_%281%29.pdf?1610810475" target="_blank" rel="noopener noreferrer">the rate of loss is reported to have slowed in recent years</a>, reforesting the world to help stem climate change is a massive task.</p><p><span>That's why the World Economic Forum launched the Trillion Trees Challenge (</span><a href="https://www.1t.org/" target="_blank" rel="noopener noreferrer">1t.org</a><span>) and is engaging organizations and individuals across the globe through its </span><a href="https://uplink.weforum.org/uplink/s/uplink-issue/a002o00000vOf09AAC/trillion-trees" target="_blank" rel="noopener noreferrer">Uplink innovation crowdsourcing platform</a><span> to support the project.</span></p><p>That's backed up by research led by ETH Zurich/Crowther Lab showing there's potential to restore tree coverage across 2.2 billion acres of degraded land.</p><p>"Forests are critical to the health of the planet," according to <a href="https://www.1t.org/" target="_blank" rel="noopener noreferrer">1t.org</a>. "They sequester carbon, regulate global temperatures and freshwater flows, recharge groundwater, anchor fertile soil and act as flood barriers."</p><p><em data-redactor-tag="em" data-verified="redactor">Reposted with permission from the </em><span><em data-redactor-tag="em" data-verified="redactor"><a href="https://www.weforum.org/agenda/2021/03/redwoods-store-more-co2-and-are-more-enormous-than-we-thought/" target="_blank">World Economic Forum</a>.</em></span></p>
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