What are believed to be the causes of the the end-Devonian mass extinction and which organisms were the most affected?
"The Devonian Plant Hypothesis" A variety of causes have been proposed for the Devonian mass extinctions. These include asteroid impacts, global anoxia (widespread dissolved oxygen shortages), plate tectonics, sea level changes and climatic change.Jul 9, 2005
What caused the mass extinction at the end-Devonian?
Both low-temperature stress (hypothermia) and oxygen deprivation (hypoxia) are implicated in the Late Devonian mass extinction. Both catastrophic asteroidal impact and catastrophic mantle plume volcanism are debated as causes of the Late Devonian mass extinction.Nov 15, 2012
What happened at the end of Devonian?
The Devonian period ends with a cataclysmic extinction event, particularly devastating to warm-water marine communities. Nearly 70-80 percent of marine invertebrate species are wiped out over two extinction pulses. Oxygen nears present-day levels of 21 percent by volume of the atmosphere.
What are the hypothetical causes of the Devonian mass extinction what organisms were most impacted?
"The Devonian Plant Hypothesis" A variety of causes have been proposed for the Devonian mass extinctions. These include asteroid impacts, global anoxia (widespread dissolved oxygen shortages), plate tectonics, sea level changes and climatic change.Jul 9, 2005
What was the main cause of the Devonian extinction?
Key Concepts:
Both low-temperature stress (hypothermia) and oxygen deprivation (hypoxia) are implicated in the Late Devonian mass extinction. Both catastrophic asteroidal impact and catastrophic mantle plume volcanism are debated as causes of the Late Devonian mass extinction.Nov 15, 2012
What organisms were affected by the Devonian extinction?
Rugose corals and stromatoporoids, the primary reef-builders of the period, are nearly wiped out. Among the other marine invertebrate victims are brachiopods and trilobites.
What organisms were impacted by the Devonian extinction?
Changes in the late Devonian hit shallow, warm waters extremely hard and fossil records indicate that this is where the most extinction occurred. In all, about 20% of all marine families went extinct. Groups particularly impacted included jawless fish, brachiopods, ammonites, and trilobites.Feb 21, 2022