[MARMAM] new publication on dolphins, marine food web and fishing impact

Chiara Piroddi C.Piroddi at fisheries.ubc.ca
Thu Apr 8 09:52:31 PDT 2010

The following paper is now available:


Piroddi, C., Bearzi, G., Christensen, V. Effects of local fisheries and
ocean productivity on the northeastern Ionian Sea ecosystem. Ecol.
Model. (2010), doi:10.1016/j.ecolmodel.2010.03.002 


Abstract: To better understand the effects of fisheries and ocean
productivity on the northeastern Ionian Sea we constructed an Ecopath
with Ecosim model with 22 functional groups. Data on biomass,
production/biomass, consumption/biomass, and diet for each group were
estimated or extrapolated from the literature. Fisheries landings and
discards were also included. Temporal trajectories were simulated using
Ecosim. The model was fitted with time-series data for the most
important groups from 1964 to 2006. Simulations highlighted a decline of
top predators and of most of the commercial species since the late
1970s. The model shows that the decline of fish resources was mainly
caused by an intensive fishing pressure that occurred in the area until
the end of the 1990s and also by changes in primary production that
impacted the trajectories of the main functional groups. In particular,
simulated changes through time in PP impacted the abundance trends of
all the commercial species, showing a cascade-up effect through the
ecosystem. The application of Ecopath with Ecosim was a useful tool for
understanding the trends of the main functional groups of the
northeastern Ionian Sea. The model underlined that management actions
are needed to restore and protect target species including marine
mammals, pelagic and demersal fishes. In particular, measures to reduce
overfishing, illegal fishing activities and to respect existing
legislations are in need. Moreover, the adoption of marine protected
areas could be an effective management measure to guarantee prey
survival and to sustain marine predators.

Keywords: Ionian Sea; Food web model; Ecopath with Ecosim; Fishing
impact; Primary production

It can be downloaded from the following link
http://dx.doi.org/10.1016/j.ecolmodel.2010.03.002 or a pdf can be
obtained from the author (email: c.piroddi at fisheries.ubc.ca).

All the best,


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