Protected and Threatened Components of Fish Biodiversity in the Mediterranean Sea

The Mediterranean Sea (0.82% of the global oceanic surface) holds 4%-18% of all known marine species (~17,000), with a high proportion of endemism [1, 2]. This exceptional biodiversity is under severe threats [1] but benefits from a system of 100 marine protected areas (MPAs). Surprisingly, the spatial congruence of fish biodiversity hot spots with this MPA system and the areas of high fishing pressure has not been assessed. Moreover, evolutionary and functional breadth of species assemblages [3] has been largely overlooked in marine systems. Here we adopted a multifaceted approach to biodiversity by considering the species richness of total, endemic, and threatened coastal fish assemblages as well as their functional and phylogenetic diversity. We show that these fish biodiversity components are spatially mismatched. The MPA system covers a small surface of the Mediterranean (0.4%) and is spatially congruent with the hot spots of all taxonomic components of fish diversity. However, it misses hot spots of functional and phylogenetic diversity. In addition, hot spots of endemic species richness and phylogenetic diversity are spatially congruent with hot spots of fishery impact. Our results highlight that future conservation strategies and assessment efficiency of current reserve systems will need to be revisited after deconstructing the different components of biodiversity.

[1]  P. Francour,et al.  A review of marine protected areas in the northwestern Mediterranean region: siting, usage, zonation and management , 2001 .

[2]  Daniel P Faith,et al.  Threatened Species and the Potential Loss of Phylogenetic Diversity: Conservation Scenarios Based on Estimated Extinction Probabilities and Phylogenetic Risk Analysis , 2008, Conservation biology : the journal of the Society for Conservation Biology.

[3]  A. Purvis,et al.  Getting the measure of biodiversity , 2000, Nature.

[4]  R. G. Davies,et al.  Global hotspots of species richness are not congruent with endemism or threat , 2005, Nature.

[5]  K. Mcnyset Ecological niche conservatism in North American freshwater fishes , 2009 .

[6]  Paul H. Williams,et al.  What to protect?—Systematics and the agony of choice , 1991 .

[7]  K. Walker,et al.  Relationship between distributions of threatened plants and protected areas in Britain , 2009 .

[8]  Alan T. White,et al.  Effectiveness of Marine Protected Areas in the Philippines for Biodiversity Conservation , 2010, Conservation biology : the journal of the Society for Conservation Biology.

[9]  C. Bianchi,et al.  Marine Biodiversity of the Mediterranean Sea: Situation, Problems and Prospects for Future Research , 2000 .

[10]  B. Fady,et al.  Macroecological patterns of species and genetic diversity in vascular plants of the Mediterranean basin , 2010 .

[11]  D. Mouillot,et al.  Do we protect biological originality in protected areas? A new index and an application to the Bonifacio Strait Natural Reserve , 2008 .

[12]  Jonathan M. Chase,et al.  Evolutionary diversification in stickleback affects ecosystem functioning , 2009, Nature.

[13]  Mark E. Miller,et al.  Prioritizing Conservation Effort through the Use of Biological Soil Crusts as Ecosystem Function Indicators in an Arid Region , 2008, Conservation biology : the journal of the Society for Conservation Biology.

[14]  Daniel Pauly,et al.  Assessing progress towards global marine protection targets: shortfalls in information and action , 2008, Oryx.

[15]  Alison Green,et al.  Designing marine protected area networks to address the impacts of climate change , 2009 .

[16]  J. L. Gittleman,et al.  Preserving the Tree of Life , 2003, Science.

[17]  Elizabeth A. Moffitt,et al.  The utility and limitations of size and spacing guidelines for designing marine protected area (MPA) networks , 2011 .

[18]  D. Faith Conservation evaluation and phylogenetic diversity , 1992 .

[19]  Peter J Mumby,et al.  Reserve design for uncertain responses of coral reefs to climate change. , 2011, Ecology letters.

[20]  R. Evans,et al.  Rapid increase in fish numbers follows creation of world's largest marine reserve network , 2008, Current Biology.

[21]  Wilfried Thuiller,et al.  Spatial mismatch and congruence between taxonomic, phylogenetic and functional diversity: the need for integrative conservation strategies in a changing world. , 2010, Ecology letters.

[22]  Kevin J. Gaston,et al.  Maximising phylogenetic diversity in the selection of networks of conservation areas , 2002 .

[23]  A. Prinzing The niche of higher plants: evidence for phylogenetic conservatism , 2001, Proceedings of the Royal Society of London. Series B: Biological Sciences.

[24]  Ameer Abdulla,et al.  Challenges facing a network of representative marine protected areas in the Mediterranean: prioritizing the protection of underrepresented habitats. , 2008 .

[25]  David Mouillot,et al.  Contrasting changes in taxonomic vs. functional diversity of tropical fish communities after habitat degradation. , 2010, Ecological applications : a publication of the Ecological Society of America.

[26]  N. Dulvy,et al.  Average functional distinctness as a measure of the composition of assemblages , 2008 .

[27]  V. Stelzenmüller,et al.  Patterns of species and functional diversity around a coastal marine reserve: a fisheries perspective , 2009 .

[28]  Todd H. Oakley,et al.  Evolutionary history and the effect of biodiversity on plant productivity , 2008, Proceedings of the National Academy of Sciences.

[29]  Matthew E. Watts,et al.  Effectiveness of the global protected area network in representing species diversity , 2004, Nature.

[30]  D. Mouillot,et al.  Fish diversity patterns in the Mediterranean Sea: deviations from a mid-domain model , 2009 .

[31]  Luigi Boitani,et al.  Gap analysis of terrestrial vertebrates in Italy: Priorities for conservation planning in a human dominated landscape , 2006 .

[32]  Fabrice DeClerck,et al.  Loss of functional diversity under land use intensification across multiple taxa. , 2009, Ecology letters.

[33]  Ferdinando Boero,et al.  Italian marine reserve effectiveness: Does enforcement matter? , 2008 .

[34]  Richard Grenyer,et al.  Preserving the evolutionary potential of floras in biodiversity hotspots , 2007, Nature.

[35]  Camilo Mora,et al.  Coral Reefs and the Global Network of Marine Protected Areas , 2006, Science.

[36]  Chad W. Hargrave,et al.  Effects of fish species richness and assemblage composition on stream ecosystem function , 2009 .

[37]  P. Marquet,et al.  Assessing the performance of the existing and proposed network of marine protected areas to conserve marine biodiversity in Chile , 2009 .

[38]  S. Somot,et al.  The Biodiversity of the Mediterranean Sea: Estimates, Patterns, and Threats , 2010, PloS one.

[39]  A. Mooers,et al.  Evolutionary Distinctiveness, Threat Status, and Ecological Oddity in Primates , 2010, Conservation biology : the journal of the Society for Conservation Biology.

[40]  Serge Planes,et al.  Effectiveness of European Atlanto-Mediterranean MPAs: Do they accomplish the expected effects on populations, communities and ecosystems? , 2008 .

[41]  A. Brito,et al.  Identifying keystone predators and the importance of preserving functional diversity in sublittoral rocky-bottom areas , 2010 .

[42]  Louisa Wood,et al.  Toward representative protection of the world's coasts and oceans—progress, gaps, and opportunities , 2008 .