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|a Faunal evidence for a late quaternary trans-Antarctic seaway |h [electronic resource]. |
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|a [S.l.] : |b Blackwell Publishing Ltd, |c 2010. |
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|a Global Change Biology. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a Collapse of the West Antarctic Ice Sheet (WAIS) would raise global sea level by [approximately]3.3–5 m. Ice-sheet models and
geological data suggest at least one collapse has happened during the last 1.1 Ma, and some scenarios of future climate
change predict a collapse within the next two centuries. A complete WAIS collapse would open shallow seaways
across West Antarctica, potentially enabling exchange of animals between West Antarctic seas. We investigated
biological evidence for past connectivity between different regions of Antarctica by comparing the composition of
modern bryozoan assemblages from the continental margin around Antarctica. Surprisingly, we found most similarity
between two areas which are not currently connected – the shelves of the Weddell Sea (WS) and Ross Sea (RS). We
evaluated three hypotheses to explain this and conclude that bryozoans most likely dispersed through a trans-
Antarctic seaway that opened in response to a WAIS collapse and connected the WS and RS shelves. These bryozoans
must have survived glaciations(s) during subsequent ice ages in refuges, whereas they were wiped out in most other
regions of the Antarctic shelf. After the last glacial period, bryozoan assemblages could freely disperse between many
of the regions we examined (e.g. Antarctic Peninsula and South Shetland Islands), which has allowed recolonization
of areas in which bryozoans had been eradicated during the last ice age. For the bryozoans on the WS and RS shelves
to be more similar than those which are in close proximity means the trans-Antarctic seaway may have been as late as
the last few interglacials. Current rates of warming are exceptional compared with the near past glacial cycles so our
study, the strongest faunal evidence ofWAIS collapse during the recent geological past, thus supports predictions of a
near future WAIS collapse (with considerable global sea level implications) and resultant future major faunal
exchanges. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a. |z Ross Sea (Antarctica) |
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|a Claus- Dieter Hillenbrand. |
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|t Faunal evidence for a late quaternary trans-Antarctic seaway |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15042643/00001 |y Click here for full text |
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|3 FULL TEXT |u http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2486.2010.02198.x/full |y Faunal evidence for a late quaternary trans-Antarctic seaway |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/04/26/43/00001/FI15042643_thm.jpg |
