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Ecological Indicators To Capture The Effects Of Fishing On Biodiversityand Conservation Status Of Marine Ecosystems, M. Coll, L. J. Shannon, K.M. Kleisner, M.J. Juan-Jordá, A. Bundy, A.G. Akoglu, D. Banaru, J.L. Boldt, M.F. Borges, A. Cook, I. Diallo, C. Fu, C. Fox, D. Gascuel, L.J. Gurney, T. Hattab, J.J. Heymans, D. Jouffre, B.R. Knight, S. Kucukavsar, S.I. Large, C. Lynam, A. Machias, K.N. Marshall, H. Masski, H. Ojaveer, C. Piroddi, J. Tam, D. Thiao, M. Thiaw, M.A. Torres, M. Travers-Trolet, K. Tsagarakis, I. Tuck, G.I. Van Der Meeren, D. Yemane, S.G. Zador, Y.-J. Shin
Ecological Indicators To Capture The Effects Of Fishing On Biodiversityand Conservation Status Of Marine Ecosystems, M. Coll, L. J. Shannon, K.M. Kleisner, M.J. Juan-Jordá, A. Bundy, A.G. Akoglu, D. Banaru, J.L. Boldt, M.F. Borges, A. Cook, I. Diallo, C. Fu, C. Fox, D. Gascuel, L.J. Gurney, T. Hattab, J.J. Heymans, D. Jouffre, B.R. Knight, S. Kucukavsar, S.I. Large, C. Lynam, A. Machias, K.N. Marshall, H. Masski, H. Ojaveer, C. Piroddi, J. Tam, D. Thiao, M. Thiaw, M.A. Torres, M. Travers-Trolet, K. Tsagarakis, I. Tuck, G.I. Van Der Meeren, D. Yemane, S.G. Zador, Y.-J. Shin
United States Department of Commerce: Staff Publications
IndiSeas (“Indicators for the Seas”) is a collaborative international working group that was established in2005 to evaluate the status of exploited marine ecosystems using a suite of indicators in a comparative framework. An initial shortlist of seven ecological indicators was selected to quantify the effects of fishing on the broader ecosystem using several criteria (i.e., ecological meaning, sensitivity to fishing, data avail-ability, management objectives and public awareness). The suite comprised: (i) the inverse coefficient of variation of total biomass of surveyed species, (ii) mean fish length in the surveyed community, (iii)mean maximum life span of surveyed fish species, (iv) proportion …
A Combined Visual And Acoustic Estimate Of 2008 Abundance, And Change In Abundance Since 1997, For The Vaquita, Phocoena Sinus, Tim Gerrodette, Barbara L. Taylor, René Swift, Shannon Rankin, Armando M. Jaramillo-Legorreta, Lorenzo Rojas-Bracho
A Combined Visual And Acoustic Estimate Of 2008 Abundance, And Change In Abundance Since 1997, For The Vaquita, Phocoena Sinus, Tim Gerrodette, Barbara L. Taylor, René Swift, Shannon Rankin, Armando M. Jaramillo-Legorreta, Lorenzo Rojas-Bracho
United States Department of Commerce: Staff Publications
A line-transect survey for the critically endangered vaquita, Phocoena sinus, was carried out in October–November 2008, in the northern Gulf of California,Mexico. Areas with deeper water were sampled visually from a large research vessel, while shallow water areas were covered by a sailboat towing an acoustic array. Total vaquita abundance in 2008 was estimated to be 245 animals (CV = 73%, 95% CI 68– 884). The 2008 estimate was 57% lower than the 1997 estimate, an average rate of decline of 7.6%/yr. Bayesian analyses found an 89% probability of decline in total population size during the 11 yr period, …
Fisheries Buybacks: A Review And Guidelines, Dale Squires
Fisheries Buybacks: A Review And Guidelines, Dale Squires
United States Department of Commerce: Staff Publications
Buybacks of fishing vessels, licences, access and other rights, and gear, sometimes called decommissioning schemes, have traditionally been a key policy tool to address overcapacity, overexploitation of fish stocks, and distributional issues in fisheries. Two more issues can be added, sustainable use of ecosystems and conservation of biodiversity (i.e. ecological public goods and services) and providing a transition to a more rationalized fishery. This study discusses reasons for buybacks; examines consequences; considers asymmetric information, design of buyback auctions and other design issues; buybacks as a transition to a rationalized industry with strong property rights and governance, financing and transnational fisheries; …
Early Detection Of Population Fragmentation Using Linkage Disequilibrium Estimation Of Effective Population Size, Phillip R. England, Gordon Luikart, Robin Waples
Early Detection Of Population Fragmentation Using Linkage Disequilibrium Estimation Of Effective Population Size, Phillip R. England, Gordon Luikart, Robin Waples
United States Department of Commerce: Staff Publications
Population subdivision due to habitat loss and modification, exploitation of wild populations and altered spatial population dynamics is of increasing concern in nature. Detecting population fragmentation is therefore crucial for conservation management. Using computer simulations, we show that a single sample estimator of Ne based on linkage disequilibrium is a highly sensitive and promising indicator of recent population fragmentation and bottlenecks, even with some continued gene flow. For example, fragmentation of a panmictic population of Ne = 1,000 into demes of Ne = 100 can be detected with high probability after a single generation when estimates from …