BIOL 2060 Lecture 25: Unit 2 L25 Food Webs

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; who eat whom: host-parasitoid networks (including diseases, mutualistic networks (e. g. pollination and mycorrhizae) Looked at caribbean sea, random sample with about 30% of species, 11% of all possible reactions: total 249 species and 3313 interactions, thickness of arrows: strong vs weak interactions. Strong interactors (keystone species) determine community structure: weak interactors (species with little effect on community structure) provide the glue that keeps the web together, a combination of few strong and many weak interactors is often the most stable. Importance of habitat in supporting food web: biomes and their climate, small and large scale, mutualism, symbiosis, facilitation. Structural complexity: the network could be an intricate tangle: network evolution: the network changes over time, connection diversity: the links could have different weights, directions and signs. In general, food webs show higher connectance than non-biological webs. Species/functional group richness: binary/network models, presence/absence, connectance, trophic/biomass models, abundance/biomass, trophic flows of energy and biomass, productivity.

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