BlogArena

General blog about anything and everything of everyday's life.

16. Sep 2019

January 9, 2014
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Ancient sharks reared young in prehistoric river-delta nursery

ANN ARBOR — Like salmon in reverse, long-snouted Bandringa sharks migrated downstream from freshwater swamps to a tropical coastline to spawn 310 million years ago, leaving behind fossil evidence of one of the earliest known shark nurseries. That’s the surprising … Continue reading

August 6, 2013
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From obscurity to dominance: Tracking the rapid evolutionary rise of ray-finned fish

ANN ARBOR — Mass extinctions, like lotteries, result in a multitude of losers and a few lucky winners. This is the story of one of the winners, a small, shell-crushing predatory fish called Fouldenia, which first appears in the fossil … Continue reading

May 11, 2011
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The Winners of Mass Extinction: With Predators Gone, Prey Thrives

*Extinction of fishes 360 million years ago created natural ecology experiment* In present-day ecology, the removal or addition of a predator in an ecosystem can produce dramatic changes in the population of prey species. For the first time, scientists have … Continue reading