Seasonal changes in the Peruvian upwelling ecosystem
1993
Teichmann, A.J. | Pauly, D. (Alfred Wegener Inst. for Polar and Marine Research, P.O. Box 12 01 61, D-27515 Bremerhaven (Germany))
A set of twelve balanced steady-state models is presented which quantify the seasonal changes in biomass and food consumption among major fish stocks of the Peruvian upwelling ecosystem, Engraulis ringens, Sardinops sagax, Scomber japonicus, Trachurus murphji and Merluccius gayi, as well as three species of guano birds and three groups of marine mammals. The results are based on published series of monthly biomasses and vital statistics, covering the years 1973 to 1979, a period which did not include major El Nino events. The seasonality of network flow indices computed from these models is discussed, following the theory of R.E. Ulanowicz
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