The heterotrophic activity for amino acids,glucose and acetate in Antarctic waters |
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| Authors: | Paul A Gillespie Richard Y Morita Larry P Jones |
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| Institution: | (1) Dept. Microbiology and School of Oceanography, Oregon State Univ., USA;(2) Present address: Woods Hole Oceanographic Institution, 02543 Woods Hole, Mass., USA;(3) Department of Microbiology and School of Oceanography, Oregon State University, 97331 Corvallis, Oregon, USA;(4) Present address: Dept. Biological Sciences, Univ. of Texas at El Paso, 79908 El Paso, Texas, USA |
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| Abstract: | The kinetic approach ofWright andHobbie (1966) was used to determine the heterotrophic potential of Antarctic waters. Variations with depth and geographical location are discussed. Temperature studies indicate the psychrophilic nature of the microbial population. In samples having environmental temperatures of approximately –1 C, significant activities were recorded at the lowest incubation temperatures tested (–3C). Activities increased with increasing incubation temperatures up to +3C but were somewhat depressed at +10C and above. By testing a wide range of substrates, qualitative differences were noted in the microbial populations of different areas.Highest rates of uptake were found in the euphotic zone whereas Vmax values of samples from depths of 500 m and below were in most cases unmeasurable.Published as Technical Paper No. 4259, Oregon Agricultural Experiment Station. |
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