Fisheries have rarely been'sustainable'. Rather, fishing has induced serial depletions, long
masked by improved technology, geographic expansion and exploitation of previously …

Recent studies document unprecedented declines in marine top predators that can initiate
trophic cascades. Predicting the wider ecological consequences of these declines requires …

The Ecopath with Ecosim (EwE) modeling approach combines software for ecosystem
trophic mass balance analysis (Ecopath), with a dynamic modeling capability (Ecosim) for …

Low–trophic level species account for more than 30% of global fisheries production and
contribute substantially to global food security. We used a range of ecosystem models to …

Quantitative modeling methods have become a central tool in the management of harvested
fish populations. This book examines how these modeling methods work, why they …

The software described in the present guide is designed to help you construct a (simple or
complex) model of the trophic flows in an ecosystem. Once the model is constructed you will …

The 'Ecopath', later expanded to 'Ecopath with Ecosim'('EwE'), modeling approach has been
applied to hundreds of ecosystems around the world, since its first implementation in 1984 …

The estimation of fractional trophic levels (TROPHs) is essential for the management
offisheries resources as well as for quantifyingthe ecosystem effects of fishing. We …

Life history theories attempt to explain the evolution of organism traits as adaptations to
environmental variation. A model involving three primary life history strategies (endpoints on …

Keystones are defined as relatively low biomass species with a structuring role in their food
webs. Thus, identifying keystone species in a given ecosystem may be formulated as:(1) …