Upgrades are endemic in the software industry and create the possibility that customers might either postpone purchase or buy early on and never upgrade: When will a customer upgrade? Is it better to upgrade now or to wait for an improved version? When should we release an improved product? How much should we charge for each version? Should we give discounts on upgrades to existing customers? W...

Longevity of Rhizoprionodon terraenovae and Carcharhinus acronotus in the western North Atlantic Ocean was examined using direct age estimates from vertebral sections and tag-recapture data. Time-at-liberty ranged from 7.7-14.0 years (mean =10.1) for R. terraenovae and 10.9-12.8 years (mean =11.9) for C. acronotus. Maximum estimated longevity was determined to be 19.8 years through tag-recaptur...

Longline sampling (83 sets) supplemented with 6 pop-off archival transmitting (PAT) tag deployments were used to characterize vertical habitat use by Caribbean reef sharks Carcharhinus perezi at Glover’s Reef atoll, Belize. Longline catch-per-unit-effort (CPUE) in 2 shallow reef habitats (lagoon <18 m depth, fore-reef <40 m depth) underwent significant nocturnal increases for sharks larger than...

Chad Johnson,† Brandon Long,† Joseph G. Nguyen,‡ Victor W. Day,‡ A. S. Borovik,§ Bala Subramaniam,† and Javier Guzman*,† Center for EnVironmentally Beneficial Catalysis and Department of Chemical and Petroleum Engineering, UniVersity of Kansas, Lawrence, Kansas 66045, Department of Chemistry, UniVersity of Kansas, Lawrence, Kansas 66045, and Department of Chemistry, UniVersity of California, Ir...

The present study evaluated the ecological response of fish fauna to hydrological restoration in a mangrove area Terminos Lagoon Gulf Mexico. In two years, environmental parameters and ichthyofauna were obtained channel under conserved channel. was composed 12 species. As result process, changes composition abundance some species detected. presence visiting marine Bathygobius soporator Eucinost...