TY  - JOUR
A1  - Andersen, Knud Peter
A1  - Ursin, Erik
T1  - A multispecies extension to the Beverton and Holt theory of fishing : with accounts of phosphorus circulation and primary production
T2  - Meddelelser fra Danmarks Fiskeri- og Havundersøgelser
N2  - Interaction between species in a marine ecosy stem is described by expressions for food consumption and grazing mortality which are consistent with each other and with the Beverlon and Holt model of the population dynamics ofindividual species. A model of primary production is introduced in order to make possible an account of nutricnt circlliation (as examplified by phosphorus) within and nutrient flow through the system. It is demonstrated in an application to North Sea fishencs that recent changes in total yield can be described in some detail under the terms of the model as a function of fishing mortality alone. The composition of the North Sea fauna in the virgin state is discussed and also the conditions under which total yield could be increased above the 1970 level.
Y1  - 2009
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/12710
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-1133120
SN  - 0070-3435
N1  - Signatur: 4 P 423.4239
VL  - N.S. 7
SP  - 319
EP  - 435
ER  -