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There are indications that pelagic cnidar-ians and ctenophores ('jellyfish') have increased in abundance throughout the world, or that outbreaks are more frequent, although much uncertainty surrounds the issue, due to the scarcity of reliable baseline data. Numerous hypotheses have been proposed for the individual increases or outbreaks that are better(More)
Competition between marine mammals and fisheries for marine resources-whether real or perceived-has become a major issue for several countries and in international fora. We examined trophic interactions between marine mammals and fisheries based on a resource overlap index, using seven Ecopath models including marine mammal groups. On a global scale, most(More)
BACKGROUND Ecological attributes estimated from food web models have the potential to be indicators of good environmental status given their capabilities to describe redundancy, food web changes, and sensitivity to fishing. They can be used as a baseline to show how they might be modified in the future with human impacts such as climate change,(More)
Understanding the mechanisms responsible for the stability and persistence of natural communities is one of the greatest challenges in ecology [1]. Robert May showed that contrary to intuition, complex randomly built communities are less likely to be stable than simpler ones [2, 3]. For four decades, ecologists have tried to isolate the non-random(More)
Understanding the mechanisms responsible for stability and persistence of ecosystems is one of the greatest challenges in ecology. Robert May showed that, contrary to intuition, complex randomly built ecosystems are less likely to be stable than simpler ones. Few attempts have been tried to test May's prediction empirically, and we still ignore what is the(More)
  • L Biery, M L D Palomares, L Morissette, W W L Cheung, S Harper, J Jacquet +12 others
  • 2011
Sharks in the seas around us 2 Sharks in the seas around us 3 Foreword As a result of efforts by a vast number of people, the tide may be turning for sharks, of which millions are finned every year and used to make a supposed delicacy in which the shark-fin component could easily be replaced by thin cardboard strips. Indeed, shark fin soup is the main(More)
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