Fine-scale temporal variation in marine extracellular enzymes of coastal southern California
Extracellular enzymes are functional components of marine microbial communities that contribute to nutrient remineralization by catalyzing the degradation of organic substrates. Particularly in coastal environments, the magnitude of variation in enzyme activities across timescales is not well charac...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2012-08-01
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| Series: | Frontiers in Microbiology |
| Subjects: | |
| Online Access: | http://journal.frontiersin.org/Journal/10.3389/fmicb.2012.00301/full |
| _version_ | 1828201308558983168 |
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| author | Steven D Allison Yi eChao John D Farrara Stephen eHatosy Adam eMartiny |
| author_facet | Steven D Allison Yi eChao John D Farrara Stephen eHatosy Adam eMartiny |
| author_sort | Steven D Allison |
| collection | DOAJ |
| description | Extracellular enzymes are functional components of marine microbial communities that contribute to nutrient remineralization by catalyzing the degradation of organic substrates. Particularly in coastal environments, the magnitude of variation in enzyme activities across timescales is not well characterized. Therefore, we established the MICRO time series at Newport Pier, California, to assess enzyme activities and other ocean parameters at high temporal resolution in a coastal environment. We hypothesized that enzyme activities would vary most on daily to weekly timescales, but would also show repeatable seasonal patterns. In addition, we expected that activities would correlate with nutrient and chlorophyll concentrations, and that most enzyme activity would be bound to particles. We found that 34-48% of the variation in enzyme activity occurred at timescales <30 days. 28-56% of the variance in seawater nutrient concentrations, chlorophyll concentrations, and ocean currents also occurred on this timescale. Only the enzyme β-glucosidase showed evidence of a repeatable seasonal pattern, with elevated activities in the spring months that correlated with spring phytoplankton blooms in the Southern California Bight. Most enzyme activities were weakly but positively correlated with nutrient concentrations (r = 0.24-0.31) and upwelling (r = 0.29-0.35). For the enzymes β-glucosidase and leucine aminopeptidase, most activity was bound to particles. However, 81.2% of alkaline phosphatase and 42.8% of N-acetyl-glucosaminidase activity was freely dissolved. These results suggest that enzyme-producing bacterial communities and nutrient dynamics in coastal environments vary substantially on short timescales (<30 days). Furthermore, the enzymes that degrade carbohydrates and proteins likely depend on microbial communities attached to particles, whereas phosphorus release may occur throughout the water column. |
| first_indexed | 2024-04-12T11:28:59Z |
| format | Article |
| id | doaj.art-ab4ef6f113d44f4b8f5c867972e9de97 |
| institution | Directory Open Access Journal |
| issn | 1664-302X |
| language | English |
| last_indexed | 2024-04-12T11:28:59Z |
| publishDate | 2012-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Microbiology |
| spelling | doaj.art-ab4ef6f113d44f4b8f5c867972e9de972022-12-22T03:35:07ZengFrontiers Media S.A.Frontiers in Microbiology1664-302X2012-08-01310.3389/fmicb.2012.0030131955Fine-scale temporal variation in marine extracellular enzymes of coastal southern CaliforniaSteven D Allison0Yi eChao1John D Farrara2Stephen eHatosy3Adam eMartiny4University of California-IrvineRemote Sensing Solutions, Inc.Remote Sensing Solutions, Inc.University of California-IrvineUniversity of California-IrvineExtracellular enzymes are functional components of marine microbial communities that contribute to nutrient remineralization by catalyzing the degradation of organic substrates. Particularly in coastal environments, the magnitude of variation in enzyme activities across timescales is not well characterized. Therefore, we established the MICRO time series at Newport Pier, California, to assess enzyme activities and other ocean parameters at high temporal resolution in a coastal environment. We hypothesized that enzyme activities would vary most on daily to weekly timescales, but would also show repeatable seasonal patterns. In addition, we expected that activities would correlate with nutrient and chlorophyll concentrations, and that most enzyme activity would be bound to particles. We found that 34-48% of the variation in enzyme activity occurred at timescales <30 days. 28-56% of the variance in seawater nutrient concentrations, chlorophyll concentrations, and ocean currents also occurred on this timescale. Only the enzyme β-glucosidase showed evidence of a repeatable seasonal pattern, with elevated activities in the spring months that correlated with spring phytoplankton blooms in the Southern California Bight. Most enzyme activities were weakly but positively correlated with nutrient concentrations (r = 0.24-0.31) and upwelling (r = 0.29-0.35). For the enzymes β-glucosidase and leucine aminopeptidase, most activity was bound to particles. However, 81.2% of alkaline phosphatase and 42.8% of N-acetyl-glucosaminidase activity was freely dissolved. These results suggest that enzyme-producing bacterial communities and nutrient dynamics in coastal environments vary substantially on short timescales (<30 days). Furthermore, the enzymes that degrade carbohydrates and proteins likely depend on microbial communities attached to particles, whereas phosphorus release may occur throughout the water column.http://journal.frontiersin.org/Journal/10.3389/fmicb.2012.00301/fullPhytoplanktontime seriescoastal oceanMarine microbesextracellular enzymeparticles |
| spellingShingle | Steven D Allison Yi eChao John D Farrara Stephen eHatosy Adam eMartiny Fine-scale temporal variation in marine extracellular enzymes of coastal southern California Frontiers in Microbiology Phytoplankton time series coastal ocean Marine microbes extracellular enzyme particles |
| title | Fine-scale temporal variation in marine extracellular enzymes of coastal southern California |
| title_full | Fine-scale temporal variation in marine extracellular enzymes of coastal southern California |
| title_fullStr | Fine-scale temporal variation in marine extracellular enzymes of coastal southern California |
| title_full_unstemmed | Fine-scale temporal variation in marine extracellular enzymes of coastal southern California |
| title_short | Fine-scale temporal variation in marine extracellular enzymes of coastal southern California |
| title_sort | fine scale temporal variation in marine extracellular enzymes of coastal southern california |
| topic | Phytoplankton time series coastal ocean Marine microbes extracellular enzyme particles |
| url | http://journal.frontiersin.org/Journal/10.3389/fmicb.2012.00301/full |
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