A carbon flow model and network analysis of the northern Benguela upwelling system, Namibia
- 1 February 2000
- journal article
- Published by Elsevier BV in Ecological Modelling
- Vol. 126 (1), 9-32
- https://doi.org/10.1016/s0304-3800(99)00192-1
Abstract
A carbon flow model was constructed of the northern Benguela upwelling ecosystem. The model consists of 22 living and two non-living compartments, depicting the biomass of each compartment and the rates of exchange between them. The only primary producer in this system is phytoplankton, whilst bacteria, heterotrophic microflagellates and microzooplankton form part of the microbial loop. Primary consumers include mesozooplankton, macrozooplankton and jellyfish, while the fish community consists of anchovy, pilchard, lanternfish, gobies, horse mackerel, hake, snoek, benthic feeding fish and other carnivorous fish. The top consumers are seabirds and seals. The primary production–zooplankton–pelagic fish–demersal fish energy flow pathway appears to dominate in this system, with jellyfish, pilchard and horse mackerel being the most important planktivores. Jellyfish appears to be an important component in the system due to its high biomass and consumption of about 10% of the primary production. Hake is the most important secondary consumer. The carbon flow model was analyzed by means of network analysis, and the results show a total system throughput of about 88897 mg C m−2 day−1, a development capacity of 38 041 mg C m−2 day−1, an ascendancy value of 17 313 mg C m−2 day−1, that about 7% of the total system throughput is recycled on a daily basis, and that the internal relative ascendancy is about 44%. These results were compared to similar data from other systems such as the southern Benguela and the Peruvian upwelling systems.Keywords
This publication has 74 references indexed in Scilit:
- Assessment of Spatial and Temporal Variability in Ecosystem Attributes of the St Marks National Wildlife Refuge, Apalachee Bay, FloridaEstuarine, Coastal and Shelf Science, 1998
- Estimates of daily ration for the South African (Cape) fur sealSouth African Journal of Marine Science, 1994
- Comparative study on the trophic structure, cycling and ecosystem properties of four tidal estuariesMarine Ecology Progress Series, 1993
- Variability of particulate organic carbon and nitrogen in the Namibian upwelling systemMarine Biology, 1991
- The comparative ecology of six marine ecosystemsPhilosophical Transactions Of The Royal Society B-Biological Sciences, 1991
- Diet and feeding of Euphausia hanseni and Nematoscelis megalops (Euphausiacea) in the northern Benguela Current: ecological significance of vertical space partitioningMarine Ecology Progress Series, 1991
- The Seasonal Dynamics of The Chesapeake Bay EcosystemEcological Monographs, 1989
- Energy requirements for a dense population of rock lobsters Jasus lalandii: novel importance of unorthodox food sourcesMarine Ecology Progress Series, 1988
- Release of aminoacids and inorganic nutrients by heterotrophic marine micro-flagellatesMarine Ecology Progress Series, 1985
- The Ecological Role of Water-Column Microbes in the SeaMarine Ecology Progress Series, 1983