On Earth and Life

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  • Created by: Sophie
  • Created on: 11-05-15 14:33

1. What does Haile et al in Ancient DNA reveals late survival of mammoth and horse in interior Alaska, reveal?

  • Claims that the main cause of megafauna extinction was solely down to overkill and other factors such as climate, vegetation, hyper diseases and terrestrial impact did not contribute at all
  • That the use of sedimentary DNA shows that these megafauna persisted in Alaska until 10,500 yr BP, as opposed to 13,000-15,000 yr BP which was shown by LADS
  • SedaDNA showed that megafauna we extinct long before the onset of the Holocene and that they never overlapped with humans for several millenia
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Other questions in this quiz

2. Which is not a key feature of Foote and Raup, Fossil preservation and the stratigraphic ranges of taxa?

  • The completeness of the fossil record hinders the inference of the evolutionary rates and patterns
  • There is a relationship bteween the true taxonomic durations, preservation probability and observed taxonomic durations
  • Reasonable approximations are possible given non exponential duration distributions and temporal and taxonomic variations in preservability
  • You can use these relationship to estimate original distributions of taxonomic duration, preservation probable and completeness given the observed range. No data on the occurences is required
  • When preservation is random and the original distribution of durations is exponential, the inference of durations, preservability and completeness is exact.

3. Which is not a feature of Barnosky's (2011) Has the Earths 6th extinction already arrived?

  • Current extinction rates are higher than would be expected from the fossil record, highlighting the need for effective conservation measures.
  • Biologists now suggest that a sixth mass extinction may be under way, given the known species losses over the past few centuries and millennia
  • Palaeontologists characterize mass extinctions as times when the Earth loses more than 1/2 of its species in a geologically short interval, as has happened only 5x in the past 540million years
  • Differences between fossil and modern data and the addition of recently available palaeontological information influence our understanding of the current extinction crisis

4. Which is not a feature of Lavers, Why Elephants have big ears? (For birds)

  • The age of the mammals is a period of diversification over the past 70 million years and also the age of the birds. Evolution of still in the age of dinosaurs?
  • Birds are driven by powerful metabolic engines, maintain their bodies at a high/constant temps and have extremely high aerobic capacities (39-42'C) Warm blooded
  • Their wing size has decreased over the years for better flights and their beaks have adapted regarding their change in diet

5. Which is not a feature of the Journal of Biogeography commentary (2005) Goodbye Gondwana?

  • The land that time forgot, or the ancient dinosaur forests of the NZ, unchanged for 600myr
  • Unchanging Gondwanic heritage is an important cultural icon
  • But there is no reason why dispersalist universe with a much diminished role for Gondwana cannot be as appealing with each taxon having its unique history a complex network of relationships reaching across the entire globe
  • The southern end of the world is where the two central ideas of historical biogeography, vicariance and dispersal, have had their most intense encounter


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