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c05_eco_net - Ecological Networks Ecological Networks 15...

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Ecological Networks 15 September 2009
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Types of ecological networks Community nodes: species links: interactions between species Population nodes: populations of one species links: dispersal between populations Individual nodes: individual organisms links: genetic relatedness (paternity/maternity)
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Community networks Antagonistic networks Food webs Host parasite/parasitoid webs Host parasite/parasitoid webs Mutualistic networks Plant seed disperser webs Plant pollinator webs Plant ant webs Ings et al 2009 J Animal Ecol
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Food webs Directed links denote direction of energy flow http://www.biologycorner.com/resources/foodweb1.gif
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http://www.coolantarctica.com/Antarctica%20fact%20file/wildlife/whales/foodweb.gif
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Host parasitoid Host parasitoid arrows point from parasitoid to host Schilthuizen & Stouthamer 1998 Heredity http://gwydir.demon.co.uk/insects/dipl_rosa.jpg
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Plant seed disperser Plant seed disperser Plants Animals Bascompte et al. 2006 Science Thompson 2006 Science
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Plant pollinator Plant pollinator Bascompte & Jordano 2007 Ann Rev Ecol Evo Syst Greenland plant pollinator network
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Plant ant Plant ant Guimarães et al. 2007 Curr Biol
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Antagonistic vs. Mutualistic Webs How are these two types of community webs similar? Different?
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Population Used to describe patterns of movement dispersal migration genetic relatedness (e.g., through parentage)
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Habitat connectivity paths McRae et al. 2008 Ecology
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Population graphs http://www.tnstate.edu/ganter/John%27s%20Senita.JP G Dyer & Nason 2004
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Individual Mahaleb cherry paternity study Fortuna et al. 2008 Ecol Lett
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Structural properties Degree distribution Hierarchy h l h Path lengths Modularity
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Food webs: Degree distribution tion ve distribut cumulativ Dunne et al 2002 PNAS power law exponential decay uniform
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Food webs: Degree distribution Distribution is correlated with connectance (C=E/N 2 )
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