Natural Science

satanboy

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satanboy

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Cereal_Killer

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Antarctica’s Thwaites Glacier ice shelf could collapse within five years​

The demise of a West Antarctic glacier poses the world’s biggest threat to raise sea levels before 2100 — and an ice shelf that’s holding it back from the sea could collapse within three to five years, scientists reported December 13 at the American Geophysical Union’s fall meeting in New Orleans.


Thwaites Glacier is “one of the largest, highest glaciers in Antarctica — it’s huge,” Ted Scambos, a glaciologist at the Boulder, Colo.–based Cooperative Institute for Research in Environmental Sciences, told reporters. Spanning 120 kilometers across, the glacier is roughly the size of Florida, and were the whole thing to fall into the ocean, it would raise sea levels by 65 centimeters, or more than two feet. Right now, its melting is responsible for about 4 percent of global sea level rise.

 

satanboy

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Flatworms
Penis fencing is a mating behaviour engaged in by many species of flatworm, such as Pseudobiceros hancockanus. Species which engage in the practise are hermaphroditic; each individual has both egg-producing ovaries and sperm-producing testes.

The flatworms "fence" using extendable two-headed dagger-like stylets. These stylets are pointed (and in some species hooked) in order to pierce their mate's epidermis and inject sperm into the haemocoel in an act known as intradermal hypodermic insemination, or traumatic insemination. Pairs can either compete, with only one individual transferring sperm to the other, or the pair can transfer sperm bilaterally. Both forms of sperm transfer can occur in the same species, depending on various factors.
 

satanboy

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satanboy

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Researchers reporting in the journal Current Biology on January 13 have discovered a massive breeding colony of notothenioid icefish in Antarctica's southern Weddell Sea. They estimate that the colony covers at least 240 square kilometres and includes about 60 million active nests. The unprecedented colony represents fish biomass of more than 60,000 tons (or over 135 million pounds).

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