SciELO - Scientific Electronic Library Online

 
vol.42 número5Efectos de la variabilidad paramétrica en la obtención de tasas de crecimiento foliar en Zostera marina L. mediante métodos alométricosEstrategias de pesca y dinámica espacial de las pesquerías artesanales en la costa atlántica uruguaya índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Revista

Articulo

Indicadores

Links relacionados

  • En proceso de indezaciónCitado por Google
  • No hay articulos similaresSimilares en SciELO
  • En proceso de indezaciónSimilares en Google

Compartir


Latin american journal of aquatic research

versión On-line ISSN 0718-560X

Resumen

BARROS, Mónica E; NEIRA, Sergio  y  ARANCIBIA, Hugo. Trophic interactions in northern Chile upwelling ecosystem, year 1997. Lat. Am. J. Aquat. Res. [online]. 2014, vol.42, n.5, pp.1109-1125. ISSN 0718-560X.  http://dx.doi.org/10.3856/vol42-issue5-fulltext-15.

A food web model is constructed to describe predator-prey interactions, community structure and trophic flows in northern Chile upwelling ecosystem (18°20'S, 24°S), for the year 1997. The model is built using the Ecopath with Ecosim software version 6.4, and encompasses 21 functional groups, ranging from primary producers (phytoplankton) to top predators (birds and marine mammals), the principal fishing resources and the fishery. Input parameters required to build the model were gathered from specialized literature, grey literature and our own estimates. The results indicated that the total biomass (BT) was estimated at 624.7 ton km-2. The combined biomass of small pelagic fish represented 26% of BT, while the combined biomass of demersal fish represented only 0.1% of BT. These results highlight the importance of pelagic fish in this system. Predation mortality resulted to be the main source of mortality. Nevertheless, fishing mortality was important in anchovy, mackerel, common dolphinfish and jack mackerel. The mean trophic level of the fishery was estimated as 3.7, with landings sustained mainly by anchovy. Primary production required to sustain the landings (PPR) was estimated at 7.5% of calculated total net primary production, which is lower than PPR estimates in other upwelling ecosystems. The average trophic transfer efficiency was 18%, which is in the range (10-20%) informed for marine ecosystems. Results indicate that in 1997 the northern Chile marine ecosystem was characterized for being a system far from maturity, dominated in terms of biomass and flows by the pelagic realm.

Palabras clave : upwelling; trophic level; trophic interaction; Ecopath; Ecosim; northern Chile.

        · resumen en Español     · texto en Inglés     · Inglés ( pdf )

 

Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons