File Name: havens k 1992 scale and structure in natural food webs science .zip
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Although diversity and limnology of alpine lake systems are well studied, their food web structure and properties have rarely been addressed. Here, the topological food webs of three high mountain lakes in Central Spain were examined. We first addressed the pelagic networks of the lakes, and then we explored how food web topology changed when benthic biota was included to establish complete trophic networks. We conducted a literature search to compare our alpine lacustrine food webs and their structural metrics with those of 18 published lentic webs using a meta-analytic approach. The comparison revealed that the food webs in alpine lakes are relatively simple, in terms of structural network properties linkage density and connectance , in comparison with lowland lakes, but no great differences were found among pelagic networks. The studied high mountain food webs were dominated by a high proportion of omnivores and species at intermediate trophic levels.
Research onfood webs is one of the few subdisciplines within ecology that seeks to quantify and analyze direct and indirect interactions among diverse species,rather than focusing on particular types of taxa. Food webs ideally represent whole communities including plants, bacteria, fungi, invertebrates andvertebrates. At the base of every food web are one or more types of autotrophs, organisms such as plants or chemoautotrophic bacteria,which produce complex organic compounds from an external energy source e. Using the language of graph theory and the framework of network analysis, species are represented by vertices nodes and feeding links are represented by edges links between vertices. As with any other network, the structure and dynamics of food webs can bequantified, analyzed and modeled. Examples of formats for standardized notation of binary food web data. Numbers 1—6 correspond to the different taxa.
DOI : Abrams, B. Menge, G. Mittelbach, D.
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In book: Ecological Networks: Linking Structure to Dynamics in Food Webs maintained in natural ecosystems provided a framework on which to hang some Additional scale-invariant patterns found using early food-web data included: ; Havens ), or had less even representation of taxa resulting from.
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