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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 Starvation 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. | Faculty: | Facultad de Ciencias del Mar | URI: | http://hdl.handle.net/10553/7224 |
Appears in Collections: | Trabajo final de máster |
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