“Oh what a tangled web we weave, when first we practise to deceive” ~ Sir Walter Scott.

Monday, June 18, 2007

Chains and webs ~ in ecological terms

Those following this recount will note that the spider symbolises my ex-husband and his cohort and a web, the tool used to capture me. In an ideal world, one could suggest that after narrowly escaping annihilation, upon identifying that a spider and a web could be extremely hazardous for a creature like me, all one would have to do to survive would be to make sure one never "happened upon" a web or its host, a spider, again. All well and fine, that is in an environment where creatures like me are the desired supply for spider consumers alone ~ in other words in a simple “food chain”. However, the trophic structure of most habitats is not represented as a single chain, but are a series of chains, interconnected ~ more akin to a web, with more than one species vying to consume a food supply.

Theoretically, one could suggest that if by some top-down control, that is removal of spiders from the habitat, then creatures like me could prosper without threat to survival. Except that in practice there are a couple of other crucial points to consider. First, I’m a source of nutrition to more than one species. Remember ~ it’s not a food chain, but a web.

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