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Abstract: We present results contrasting food webs constructed using the same modelwhere the source of species was either evolution or immigration from apreviously evolved species pool.
The overall structure of the webs areremarkably similar, although we find some important differences which mainlyrelate to the percentage of basal and top species.
Food webs assembled fromevolved webs also show distinct plateaux in the number of tropic levels as theresources available to system increase, in contrast to evolved webs.
Byequating the resources available to basal species to area, we are able toexamine the species-area curve created by each process separately.
They arefound to correspond to different regimes of the tri-phasic species-area curve.



Author: Craig R.
Powell, Alan J.
McKane


Source: https://arxiv.org/



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