MercoPress. South Atlantic News Agency
Tropical fish moving south because of climate change says Australian report
Australia’s Marine Climate Change 2012, released on Friday, provides evidence of a large-scale redistribution of marine species in ecosystems around Australia. Dr Elvira Poloczanska, who led the study, says there's a lot of uncertainty about the long-term impacts. Read full article
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Disclaimer & comment rules“ocean managers and policy makers are best placed to respond to the challenge of managing the impact that climate change is having on these systems”
Aug 18th, 2012 - 07:02 am - Link - Report abuse 0Who are these people looking at short term data and making such statements? By ”climate change“ they imply anthropogenic global warming, but climate cycles are with us all the time. Who are these ”ocean managers” and who appointed them? Which policy makers? Whose policies?
Where is their data from the last thousand years to show how many times populations shifted in response to cyclical changes. In the 1960's, cod moved south from Iceland because of the severe cold. It changed again and they moved back. In the medieval warm period, beluga whales moved in numbers into the sea around Greenland, and were hunted by the Eskimos, who had sailed 3000 miles from northern Alaska in skin covered boats, to colonise Greenland, over an Arctic ocean with less ice than now. The evidence is seen in anthropological and paleological finds.
#1 Yes lets just stick our heads in the sand and do nothing until its too late right?!
Aug 19th, 2012 - 05:19 pm - Link - Report abuse 0Luckily, Dennis, time-series data of various types is available from 'sediment'-cores right back to the first spreading of present-day ocean floors.
Aug 22nd, 2012 - 03:58 pm - Link - Report abuse 0Part of the the work of palaeo-ecologists, etc. researching past ocean environments is the putting together such evidences and making assertions based on these evidences and the statistics they provide.
Evidence may not be in the cod otiliths in the marine sediments - these are sparse, but it is usually in the calcareous and silicious deposits serially laid down on ocean floors by the constant rain of diatoms, coccoliths, etc. during 'time-marked' palaeo-periods.
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