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A Preliminary Comparison of the Trophic Structure of some Large Marine Ecosystems Rainer Froese IfM
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Contents Introduction Data sources Preliminary results Discussion
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Introduction Ecosystem Management is Needed Understanding of Ecosystems is Limited Generalizations are Needed Comparative Approach
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Data Sources FishBase 2000 used for Fish Data >>Table>>Table FAO Catalog and Pauly et al. 1998 used for Marine Mammals Data Div. Books used for Cephalopod Data Special Tools: Trophic Pyramids >>Troph>>Troph Special Tools: TrophLab >>TrophLab>>TrophLab
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Number of Fish Species per Trophic Level: I
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Number of Fish Species per Trophic Level: II
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Number of Fish Species per Trophic Level: III
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Number of Species per Trophic Level: IV
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Number of Species per Trophic Level: V
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Mean Size of Fish Species by Trophic Level: I
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Mean Size of Fish Species by Trophic Level: II
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Mean Size of Fish Species by Trophic Level: III
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Mean Size of Fish Species by Trophic Level: IV
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Number of Species by Trophic Level: North Sea
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Number of Species: North Sea
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Global Number of Species by Trophic Level Copepods (8000)
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Mean Size of Species by Trophic Level
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Marine vs. Freshwater Fishes
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Marine vs. Freshwater Fishes II
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Conclusions Trophic signatures appear suitable for characterisation, comparison, and grouping of ecosystems More data for other groups (birds, cephalopods, crustaceans, benthos and zooplankton) are needed
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Acknowledgements Thanks are due to Uwe Piatkowski for help with cephalopods Eli Agbayani for programming the Trophic Pyramids routine Daniel Pauly, Deng Palomares, Pasky Sa-a and Suzette Gutierrez for trophic data on fishes
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