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Title: Microbial biomass and productivity in seagrass beds

Abstract

Different methods for measuring the rates of processes mediated by bacteria in sediments and the rates of bacterial cell production have been compared. In addition, net production of the seagrass Zostera capricorni and bacterial production have been compared and some interrelationships with the nitrogen cycle discussed. Seagrass productivity was estimated by measuring the plastochrone interval using a leaf stapling technique. The average productivity over four seasons was 1.28 +- 0.28 g C/m/sup 2/ day (meand +- standard deviation, n = 4). Bacterial productivity was measured five times throughout a year using the rate of tritiated thymidine incorporated into DNA. Average values were 33 +- 12 mg C/m/sup 2/ day for sediment and 23 +- 4 for water column (n = 5). Spatial variability between samples was greater than seasonal variation for both seagrass productivity and bacterial productivity. On one occasion, bacterial productivity was measured using the rate of /sup 32/P incorporated into phospholipid. The values were comparable to those obtained with tritiated thymidine. The rate of sulfate reduction was 10 mmol SO/sub 4//m/sup 2/ day. The rate of methanogenesis was low, being 5.6 mg CH/sub 4/ produced/m/sup 2/ day. A comparison of C flux measured using rates of sulfate reductionmore » and DNA synthesis indicated that anaerobic processes were predominant in these sediments. An analysis of microbial biomass and community structure, using techniques of phospholipid analysis, showed that bacteria were predominant members of the microbial biomass and that of these strictly anaerobic bacteria were the main components. Ammonia concentration in interstitial water varied from 23 to 71 ..mu..M. Estimates of the amount of ammonia required by seagrass showed that the ammonia would turn over about once per day. Rapid recycling of nitrogen by bacteria and bacterial grazers is probably important.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
CSIRO, Queensland, Australia
OSTI Identifier:
5127400
Resource Type:
Journal Article
Resource Relation:
Journal Name: Geomicrobiol. J.; (United States); Journal Volume: 4:1
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; BACTERIA; BIOCHEMICAL REACTION KINETICS; GRASS; PRODUCTIVITY; AMMONIA; AQUATIC ORGANISMS; BIOMASS; COMPARATIVE EVALUATIONS; MEASURING METHODS; MICROORGANISMS; NITROGEN CYCLE; RECYCLING; SEDIMENTS; ENERGY SOURCES; HYDRIDES; HYDROGEN COMPOUNDS; KINETICS; NITROGEN COMPOUNDS; NITROGEN HYDRIDES; PLANTS; REACTION KINETICS; RENEWABLE ENERGY SOURCES; 140504* - Solar Energy Conversion- Biomass Production & Conversion- (-1989)

Citation Formats

Moriarty, P.J.W., Boon, P.I., Hansen, J.A., Hunt, W.G., Poiner, I.R., Pollard, P.C., Skyring, G.W., and White, D.C. Microbial biomass and productivity in seagrass beds. United States: N. p., 1985. Web. doi:10.1080/01490458509385919.
Moriarty, P.J.W., Boon, P.I., Hansen, J.A., Hunt, W.G., Poiner, I.R., Pollard, P.C., Skyring, G.W., & White, D.C. Microbial biomass and productivity in seagrass beds. United States. doi:10.1080/01490458509385919.
Moriarty, P.J.W., Boon, P.I., Hansen, J.A., Hunt, W.G., Poiner, I.R., Pollard, P.C., Skyring, G.W., and White, D.C. Tue . "Microbial biomass and productivity in seagrass beds". United States. doi:10.1080/01490458509385919.
@article{osti_5127400,
title = {Microbial biomass and productivity in seagrass beds},
author = {Moriarty, P.J.W. and Boon, P.I. and Hansen, J.A. and Hunt, W.G. and Poiner, I.R. and Pollard, P.C. and Skyring, G.W. and White, D.C.},
abstractNote = {Different methods for measuring the rates of processes mediated by bacteria in sediments and the rates of bacterial cell production have been compared. In addition, net production of the seagrass Zostera capricorni and bacterial production have been compared and some interrelationships with the nitrogen cycle discussed. Seagrass productivity was estimated by measuring the plastochrone interval using a leaf stapling technique. The average productivity over four seasons was 1.28 +- 0.28 g C/m/sup 2/ day (meand +- standard deviation, n = 4). Bacterial productivity was measured five times throughout a year using the rate of tritiated thymidine incorporated into DNA. Average values were 33 +- 12 mg C/m/sup 2/ day for sediment and 23 +- 4 for water column (n = 5). Spatial variability between samples was greater than seasonal variation for both seagrass productivity and bacterial productivity. On one occasion, bacterial productivity was measured using the rate of /sup 32/P incorporated into phospholipid. The values were comparable to those obtained with tritiated thymidine. The rate of sulfate reduction was 10 mmol SO/sub 4//m/sup 2/ day. The rate of methanogenesis was low, being 5.6 mg CH/sub 4/ produced/m/sup 2/ day. A comparison of C flux measured using rates of sulfate reduction and DNA synthesis indicated that anaerobic processes were predominant in these sediments. An analysis of microbial biomass and community structure, using techniques of phospholipid analysis, showed that bacteria were predominant members of the microbial biomass and that of these strictly anaerobic bacteria were the main components. Ammonia concentration in interstitial water varied from 23 to 71 ..mu..M. Estimates of the amount of ammonia required by seagrass showed that the ammonia would turn over about once per day. Rapid recycling of nitrogen by bacteria and bacterial grazers is probably important.},
doi = {10.1080/01490458509385919},
journal = {Geomicrobiol. J.; (United States)},
number = ,
volume = 4:1,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1985},
month = {Tue Jan 01 00:00:00 EST 1985}
}