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Marine Chapter.Indd STATUS OF THE WORLD’S MARINE SPECIES Beth A. Polidoro, Suzanne R. Livingstone, Kent E. Carpenter, Brian Hutchinson, Roderic B. Mast, Nicolas Pilcher, Yvonne Sadovy de Mitcheson, Sarah Valenti The IUCN Red List of Threatened Species™ Acknowledgements: This publication is part of The 2008 Review of The IUCN Red List of Threatened Species. The IUCN Red List is compiled and produced by the IUCN Species Programme based on contributions from a network of thousands of scientifi c experts around the world. These include members of the IUCN Species Survival Commission Specialist Groups, Red List Partners (currently Conservation International, BirdLife International, NatureServe and the Zoological Society of London), and many others including experts from universities, museums, research institutes and non-governmental organizations. The long list of people, partners and donors who made this review possible can be found at the following address: www.iucn.org/redlist/ Citation: Polidoro, B.A., Livingstone, S.R., Carpenter, K.E., Hutchinson, B., Mast, R.B., Pilcher, N., Sadovy de Mitcheson, Y. and Valenti, S. 2008. Status of the world’s marine species. In: J.-C. Vié, C., Hilton-Taylor, and S.N. Stuart (eds.). The 2008 Review of The IUCN Red List of Threatened Species. IUCN, Gland. Switzerland. Credits: Published by IUCN, Gland, Switzerland Chief Editor: Jean-Christophe Vié Editors: Craig Hilton-Taylor and Simon N. Stuart ISBN (The 2008 Review of The IUCN Red List of Threatened): 978-2-8317-1063-1 Layout: Lynx Edicions, Barcelona, Spain © 2008 International Union for Conservation of Nature and Natural Resources Cover photo: The loss of coral reef ecosystems will have devasting effects on a wide spectrum of marine species, as well as for people and nations that depend on reef resources for their livelihoods and economic security. © Jean-Christophe Vié Status of the World’s Marine Species Beth A. Polidoro, Suzanne R. Livingstone, Kent E. Carpenter, Brian Hutchinson, Roderic B. Mast, Nicolas Pilcher, Yvonne Sadovy de Mitcheson, Sarah Valenti Introduction their probability of extinction lagged far against the IUCN Red List Categories and The oceans are home to a large behind that of the terrestrial realm; out Criteria. As of 2008, six major groups of percentage of Earth’s biodiversity, of more than 41,500 plants and animals marine species have been completed, and occupying 70 percent of its surface and, currently assessed under the IUCN Red include all the world’s known species of when volume is considered, an even larger List Criteria, only approximately 1,500 were sharks and rays, groupers, reef-building percentage of habitable space. The oceans marine species. In many regions around corals, seabirds, marine mammals, and drive weather, shape planetary chemistry, the world, biodiversity conservation in the marine turtles (Figure 1). generate 70 percent of atmospheric seas is currently taking place without the oxygen, absorb most of the planet’s carbon essential species-specifi c data needed Sharks and their relatives dioxide, and are the ultimate reservoir to inform robust and comprehensive Of the 1,046 species of sharks and for replenishment of fresh water to land conservation actions. their relatives (class Chondrichthyes), a through cloud formation. Trouble for the high proportion (47%) are listed as Data oceans means trouble for humankind. Protection of our rapidly declining ocean ecosystems and species is one of the In recent years, there has been growing greatest challenges we face as stewards concern in the scientifi c community that a of our planet. In 2006, IUCN, Conservation Figure 1. Summary of 2008 Red List Categories for completed clades of marine species. Number of broad range of marine species could be International and Old Dominion University species assessed in each group in parentheses. under threat of extinction and that marine joined forces to address this gap % of biodiversity is experiencing potentially and initiated an ambitious project (the species irreversible loss due to over-fi shing, climate Global Marine Species Assessment) to 100% change, invasive species and coastal complete IUCN Red List assessments development (Dulvy et al. 2003; Roberts for a greatly expanded number of marine 80% and Hawkins 1999). Governmental and species. It is planned to complete Red public interest in marine conservation is List assessments for over 20,000 marine increasing, but the information needed to species by 2012. A great deal of progress 60% guide marine conservation planning and has already been made, and approximately policy is seriously defi cient. The IUCN 1,500 marine species have been added Red List of Threatened Species™ is the to the 2008 Red List, including all of the 40% most commonly used global dataset world’s known species of sharks and rays, for identifying the types of threat, and groupers, and reef-building corals. These 20% the levels of extinction risk to marine groups were completed in collaboration species (Hoffmann et al. 2008; Rodrigues with a number of Red List Partners et al. 2006). It forms the foundation including the IUCN SSC Shark Specialist 0% for determining and validating marine Group, the IUCN SSC Grouper and Corals(845) (161) (349) conservation priorities, for example Wrasse Specialist Group, the IUCN SSC Seabirds (7) Groupers (134) Marine turtles through the planning and management Marine Turtle Specialist Group. (1046) of protected area systems designed to Marine mammals Sharks and relatives reduce extinction risk in the sea (Edgar Results EX LC et al. 2008). However, as of 2007, the For the fi rst time, every species in selected CR/EN/VU DD NT number of marine species assessed for taxonomic groups is being assessed 1 response to increasing demand for shark snouts (or saws) edged with tooth-like products and as traditional fi sheries serrations. This saw makes them extremely come under stronger management. susceptible to bycatch in almost any Millions of sharks are caught each year fi shing gear and they are also targeted for for their fi ns which are used to make the their very high value saws and fi ns. The 21 Asian delicacy shark fi n soup. Sharks species of angel sharks face similar threats are being increasingly targeted for this and are among the most threatened purpose. Mortality from accidental catch families of sharks. Of the species of angel (or ‘bycatch’) in fi sheries targeting other sharks with suffi cient data for assessment, species is just as much of a threat, if not 78% are threatened and 21% are Critically more so, for many species. Populations Endangered. of intrinsically threatened sharks can be driven to collapse un-noticed, whilst Endemic sharks and rays with restricted fi sheries continue to be supported habitats and geographic distributions economically by more productive and also feature prominently among those plentiful target species, such as bony most threatened. The endemic Brazilian fi shes, crustaceans and squid. The life Guitarfi sh Rhinobatos horkelii, Maltese history characteristics of these species Skate Leucoraja melitensis and Harrison’s demand a precautionary approach to their Dogfi sh Centrophorus harrissoni are all exploitation; however, the lack of adequate listed as Critically Endangered. All have shark fi sheries management remains an undergone signifi cant population declines over-whelming problem, exacerbated by as a result of bycatch and target fi sheries. largely unreported catches. Historically Although unsustainable exploitation Millions of sharks are caught each year for their fi ns, fi sheries managers have given sharks appears to be the greatest threat to most which are used to make the Asian delicacy shark fi n low priority, but they are now receiving sharks globally, endemic species with soup. © John Nightingale increasing international attention with specifi c habitat preferences are also growing concerns over the sustainability of threatened by localized habitat degradation shark fi sheries. and destruction. For example, several Defi cient compared to the fi ve other inshore stingrays endemic to areas of marine groups shown. As many sharks Some species are affected by a Southeast Asia are being impacted by and rays are deep-water pelagic species, combination of all these factors. For large-scale degradation and removal of they are harder to study in the wild, and example, all seven species of sawfi sh are mangroves, acting in combination with less is known about their ecology and listed as Critically Endangered. These large threats from fi sheries activities. population status, including the impact unusual rays (sometimes in excess of 7 m of known and potentially unknown major long) are slow-growing, and populations Many wide-ranging oceanic species are threats. Approximately 17% of shark and are often isolated, with little migration also threatened. Both the Short-fi n Mako ray species are in threatened categories between areas. They have long fl attened Isurus oxyrinchus and the Long-fi n Mako (Critically Endangered, Endangered, and Vulnerable), and 13% are considered Near Threatened and may reach the thresholds for a threatened category in the near future if current threats are not reduced. Much of what is currently known about sharks and rays comes from their capture in nets from both targeted and accidental catch, which is the primary threat to this species group. Sharks grow slowly, mature late, produce few young and have low rates of population increase, making them highly vulnerable to depletion with a low capacity for recovery from over-exploitation. Shark
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