What Happens to Species Diversity as Glaciers Melt?
Published in July 2019, a study looked at the effects of melting glaciers on seafloor species diversity in Antarctica.
As glaciers melt, more sediment is released into the surrounding waters and can smother seafloor communities. As part of the same process, more icebergs are created which can scrape the bottom of the ocean, removing the top layers of sediment, known as soft sediment.
Soft sediment contains a great deal of life and plays an important role in marine ecosystems The study explains that it is one of the “key components of energy flow through food webs” and is important “in sedimentary processes especially nutrient and carbon cycling, waste breakdown and removal.”
The authors wrote that it was “the first study to comprehensively analyse the composition of Antarctic soft sediment metazoan communities across all size classes, from < 1 mm up to 10 cm, in two geographically distinct coves.”
The study found that “in contrast to findings from rocky substrata, there was no evidence of an effect of typical Antarctic stressors of iceberg scour and intense seasonality. As at other latitudes, organic content of the sediment was most strongly correlated with community structure, suggesting that increased sedimentation from run-off from melting glaciers may be the main climate change effect on these communities.”
Credit rating agency buys climate risk firm
A New York Times article explains the credit rating agency Moody’s purchase of Four Twenty Seven, a firm that measures climate risk:
“Sudden shocks such as floods, wildfires or storms can hurt businesses and send residents fleeing, taking away the tax revenue that governments use to pay their debts. And longer-term threats — such as rising seas or higher temperatures — can make those places less desirable to live in, hurting property values and, in turn, the amount raised by taxes.
Rating agencies translate those risks, along with more traditional factors such as a government’s cash flow and debt levels, into a credit rating, which communicates to investors the odds that a government will be unable to repay its bondholders. Lower ratings generally mean that borrowers need to offer investors a higher return to account for that risk.
Following a string of deadly hurricanes and wildfires in 2017, Moody’s, along with S&P Global and Fitch Ratings, issued reports warning state and local governments that their exposure to climate risk could affect their credit ratings.”
Alaskan glacier podcast
In a 25 minute podcast, Manasseh Franklin describes her experience following the water from a glacier in Alaska to the sea. She “wanted to make the melting of glaciers more real to people through her writing. So on an Alaskan rafting trip, she followed water to its source.”
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