Please use this identifier to cite or link to this item:
Title: GDH activity and ammonium excretion in the marine mysid "Leptomysis lingvura": effects of age and starvation
Authors: Fernández-Urruzola, Igor 
Director: Packard, Theodore T. 
Gómez, May 
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Glutamate dehydrogenase
Ammonium excretion
Leptomysis lingvura
Body size
Issue Date: 2010
Project: Estudio de Un Nuevo Modelo Mecanistico Para El Metabolismo Del Zooplancton 
Abstract: Ammonium (NH4+) release by bacterial remineralization and heterotrophic grazers determines the regenerated fraction of phytoplankton productivity, so the measurement of NH4+ excretion in marine organisms is necessary to characterize both the magnitude and the efficiency of the nitrogen cycle. Glutamate dehydrogenase (GDH) is largely responsible for NH4+ formation in crustaceans and consequently should be useful in estimating NH4+ excretion by marine zooplankton.<br />Here, we address body size and starvation as sources of variability on the GDH to NH4+ excretion ratio (GDH/RNH4+). We found a strong correlation between the RNH4+ and the GDH activity (r2 = 0.87, n = 41) during growth. Since GDH activity maintained a linear relation (b = 0.93) and RNH4+ scaled exponentially (b =0.55) in well fed mysids, the GDH/RNH4+ ratio increased with size. However, the magnitude of its variation increased even more when adult mysids were starved. In this case, the GDH/RNH4+ ratio ranged from 11.23 to 102.41.
Description: Máster en Oceanografía
Faculty: Facultad de Ciencias del Mar
Appears in Collections:Trabajo final de máster
Tesina Máster
Adobe PDF (547,99 kB)

En el caso de que no encuentre el documento puede ser debido a que el centro o las/os autoras/es no autorizan su publicación. Si tiene verdadero interés en el contenido del mismo, puede dirigirse al director/a o directores/as del trabajo cuyos datos encontrará más arriba.

Show full item record

Page view(s)

checked on May 20, 2023


checked on May 20, 2023

Google ScholarTM



Export metadata

This item is licensed under a Creative Commons License Creative Commons