Acceda author Fernández-Urruzola, Igor author Packard, Ted author Gómez Cabrera, May 2012-04-10T08:58:56Z 2012-04-10T08:58:56Z 2010 http://hdl.handle.net/10553/7225 [EN] Ammonium (NH4+) and nitrate (NO3-) are the main constituents of the inorganic nitrogen pool that supports primary production in marine systems. NH4+ release via glutamate deamination in heterotrophic organisms represents the largest recycled nitrogen source in the euphotic zone, supporting around the 80 % of the primary producers requirements (Harrison, 1992). Glutamate dehydrogenase (GDH) is the enzyme that catalyzes this process. This fact has lead to the use of GDH activity as an index, a proxy, for physiological NH4+ formation. The result is a measure of potential excretion that avoids incubation artefacts due to manipulation of the organisms. The relationship between GDH activity and NH4+ excretion in cultures of the marine mysid Leptomysis lingvura is analyzed here. With interspecific and environmental interferences minimized, the study shows that the relationship between GDH activity and NH4+ excretion in L. lingvura is similar to equivalent results measured on mixed assemblages of zooplankton. Submitted by Igor Fernández Urruzola (ifernandez@becarios.ulpgc.es) on 2012-04-09T10:31:13Z No. of bitstreams: 2 0659339_00000_0000.pdf: 1214838 bytes, checksum: 84ca6bb4f6572b6d660ae2f2e8092a07 (MD5) license_rdf: 22765 bytes, checksum: 56265f5776a16a05899187d30899c530 (MD5) Approved for entry into archive by Pilar López(plopez@pas.ulpgc.es) on 2012-04-10T08:58:55Z (GMT) No. of bitstreams: 2 0659339_00000_0000.pdf: 1214838 bytes, checksum: 84ca6bb4f6572b6d660ae2f2e8092a07 (MD5) license_rdf: 22765 bytes, checksum: 56265f5776a16a05899187d30899c530 (MD5) Made available in DSpace on 2012-04-10T08:58:56Z (GMT). No. of bitstreams: 2 0659339_00000_0000.pdf: 1214838 bytes, checksum: 84ca6bb4f6572b6d660ae2f2e8092a07 (MD5) license_rdf: 22765 bytes, checksum: 56265f5776a16a05899187d30899c530 (MD5) Previous issue date: 2010 SIEBM. XVI Simposio Ibérico de Estudios de Biología Marina. Alicante (España), 6-10 Septiembre 2010. 251001 Oceanografía biológica Glutamate dehydrogenase Ammonium excretion Leptomysis lingvura Body Size GDH activity and ammonium excretion during growth in the marine mysid, "Leptomysis lingvura" Póster