Trophic Signatures of Marine Organisms in the Mediterranean as Compared with Other Ecosystems - PowerPoint PPT Presentation

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Trophic Signatures of Marine Organisms in the Mediterranean as Compared with Other Ecosystems

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Trophic Signatures of Marine Organisms in the Mediterranean as Compared with Other Ecosystems Rainer Froese1, Stefan Garthe2, Daniel Pauly3, Uwe Piatkowski1 – PowerPoint PPT presentation

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Title: Trophic Signatures of Marine Organisms in the Mediterranean as Compared with Other Ecosystems


1
Trophic Signatures of Marine Organisms in the
Mediterranean as Compared with Other Ecosystems
  • Rainer Froese1, Stefan Garthe2,
  • Daniel Pauly3, Uwe Piatkowski1
  • 1) Institute of Marine Research, Düsternbrooker
    Weg 20, 24105 Kiel, Germany, rfroese_at_ifm.uni-kiel.
    de
  • 2) Research and Technology Centre (FTZ),
    University of Kiel, Hafentörn, 25761 Büsum,
    Germany
  • 3) Fisheries Centre, 2204 Main Mall, University
    of British Columbia, Vancouver, B.C., Canada V6T
    1Z4

2
Content of Presentation
  • Large Marine Ecosystems
  • Material and Methods
  • Comparing the Mediterranean
  • Scale-free Networks

3
Large Marine Ecosystems
  • An Introduction to LMEs gtgt
  • What are the LMEs gtgt

4
Material Methods
  • What are Trophic Levels? gtgt gtgt
  • How to Estimate Trophic Levels gtgt gtgt
  • Marine Mammals Data (Daniel Pauly)
  • Marine Birds Data (Stephan Garthe)
  • Cephalopod Data (Uwe Piatkowski)
  • Fish Data (www.fishbase.org)
  • gtgt

5
How to Estimate Trophic Levelss
  • Troph mean troph of food items 1
  • where the mean is weighted by the contribution of
    the different food items
  • TL (50 TL1 50 TL 2 ) / 100 1 2.5
  • ltlt

6
Global Marine Fish Species by Trophic Level
7
Fish in the Mediterranean
8
Mediterranean vs Tropical
9
Mediterranean vs Temperate
10
Comparison of Six LMEs
11
Size of Mediterranean Fishes
12
Size in other LMEs
13
Mediterranean Size vs Other LMEs
14
Distribution vs Length
15
Distribution vs Length Mediterranean
16
Mammals, Birds and Cephalopods in the
Mediterranean
17
Mammals, Birds, and Cephalopods in the North Sea
18
Trophic Pyramid Mediterranean
19
Trophic Pyramid North Sea
20
Summary on Trophic Signatures
  • Trophic signatures represent long-term
    characteristics of ecosystems
  • They are useful to compare and classify
    ecosystems
  • Trophic species pyramids also appear to be
    promising decriptors
  • Taxonomy and trophic relationships of
    invertebrates need more attention

21
Distributions I
  • Many biological parameters have a normal or
    log-normal distribution
  • size at age
  • offspring per female
  • oxygen consumption per body mass
  • distance between worm holes
  • species counts per area in a given habitat

22
Distributions II
  • Many other biological parameters follow a
    (negative) power function
  • number of sexual partners
  • number of habitats
  • number of food items
  • Such distributions are scale-free networks

23
Scale-free Network Mediterranean
24
Thank You
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