Bacterial population dynamics, production, and heterotrophic activity in a recently formed reservoir

1999 ◽  
Vol 45 (9) ◽  
pp. 747-753 ◽  
Author(s):  
Louis B Jugnia ◽  
Rémy D Tadonléké ◽  
T Sime-Ngando ◽  
J Devaux ◽  
C Andrivon
Keyword(s):  
Primary Production ◽  
Chlorophyll A ◽  
Biomass Production ◽  
Resource Availability ◽  
Bacterial Production ◽  
Standing Stock ◽  
Bacterial Biomass ◽  
Heterotrophic Activity ◽  
Chlorophyll A Concentration ◽  
Biological Variables

Seasonal and spatial fluctuations in abundance, biomass production, and potential heterotrophic activity (i.e., 14C-glucose uptake) of bacterioplankton assemblages in a 1-year-old reservoir (the Sep Reservoir, Puy-de-Dôme, France) were examined concurrently with water temperature, phytoplankton chlorophyll a concentration, and primary production (PP). Based on the values observed for these biological variables, the Sep Reservoir was considered to have evolved to an oligo-mesotrophic state. Spatiotemporal variations of bacterial variables were a consequence of the seasonal evolution of the reservoir coupled with the resource availability. Multivariate regression analyses suggest that about 14 and 26% of the variance in bacterial standing stock and activity may be explained by the physical environment (i.e., temperature) and a resource availability index (chlorophyll a concentration or primary production), respectively. A carbon budget indicated that 4-126% (mean = 20%) of the ambient PP may be channeled through the microbial loop via bacterial biomass production. Heterotrophic bacterial production in the Sep Reservoir may therefore, on occasion, represent a significant source of carbon for higher order consumers.Key words: reservoirs, plankton, bacteria, heterotrophic uptake, primary and bacterial production.

Measurements of Phytoplankton Absorption Other Than Per Unit of Chlorophyll a

Ocean Optics ◽  
1994 ◽  
Author(s):  
Mary Jane Perry
Keyword(s):  
Primary Production ◽  
Chlorophyll A ◽  
Photosynthetic Pigments ◽  
Critical Role ◽  
Specific Effect ◽  
Water Volume ◽  
Phytoplankton Abundance ◽  
Chlorophyll A Concentration ◽  
Total Irradiance ◽  
Phytoplankton Absorption

Phytoplankton plays a critical role in determining light fields of the world’s oceans, primarily through absorption of light by photosynthetic pigments (see Chapters 1 to 5). Consequently there has been considerable interest from optical researchers in determining phytoplankton absorption. Conversely, from the biological point of view, this absorption assumes paramount importance because it is the sole source of energy for photosynthesis and thus should be central to direct estimates of primary production. There are two logical parts in determining this effect of phytoplankton and in estimating primary production. One is the estimation of abundance, and the other is estimation of specific effect or specific production rate. The earliest estimates of phytoplankton abundance were based on cell counts. From the time of Francis A. Richards’ Ph.D. dissertation, however, measurement of chlorophyll a concentration per unit of water volume, because of its relative ease, has assumed a central role in abundance estimation. Physiological studies and technological advances in optical instrumentation over the last decade lead me to question whether the continued use of chlorophyll a concentration to estimate phytoplankton abundance was wise either from the viewpoint of narrowing confidence intervals on estimates of absorption and production or from the viewpoint of mechanistic understanding of the processes involved. The measurement of chlorophyll a has become such a routine tool of biological oceanography, however, that the reasons for my heresy require elaboration. Some of the reasons are not too subtle. Chlorophyll a exists with other photosynthetic pigments in organized arrays associated with photosynthetic membranes. The function of these arrays is to harvest photons and transfer their energy to the specialized reaction center complexes that mediate photochemistry (see Chapter 9). The size of the arrays or packages and the ratio of chlorophyll a molecules to other light-harvesting pigments within the packages vary with phytoplankton cell size, total irradiance and its spectral distribution, as well as with other environmental parameters. It is well known that dark-adapted (= light-limited) cells increase their complements of photopigments. This plasticity in pigment packaging is evidenced in the variability of chlorophyll a-specific absorption coefficients. Simple optical models based only on chlorophyll a concentrations cannot be accurate or precise unless the effects of pigment packaging are considered.

Productivity of the Psammic Algal Communities in the Near-Shore Zone of the Mesotrophic Lake Piaseczno (Eastern Poland)

2001 ◽  
Vol 36 (3) ◽  
pp. 537-564 ◽  
Author(s):  
Krzysztof Czernaś
Keyword(s):  
Primary Production ◽  
Chlorophyll A ◽  
Phytoplankton Biomass ◽  
Major Ions ◽  
Shore Zone ◽  
Algal Communities ◽  
Chlorophyll A Concentration ◽  
Assimilation Number ◽  
Mesotrophic Lake ◽  
Near Shore

Abstract From 1986 to 1998, the primary productivity of psammic algae was investigated in the psammolittoral of Lake Piaseczno, a mesotrophic lake. The oxygen method was developed for the direct measurement of primary production of these algae based on light and dark bottles without disturbing the subsoil structure. This productivity was also estimated in an indirect way by measurement of chlorophyll a concentrations. The productivity of phytoplankton was also measured in the same zone. The correlation between the productivity of algae and the concentration of nutrients and major ions in water was calculated. During the study period, the highest production was found in the eupsammon (31.1 to 187.7 Cass·m-2·h-1), with the hydropsammon being lower (9.6 to 100.6 Cass·m-2·h-1). For phytoplankton biomass, the numbers were very low, which is typical of pristine lakes. The chlorophyll a concentration during the study period demonstrated a different pattern ranging from 53 mg·m-2 in the hydropsammon to 765 mg·m-2 in the eupsammon. The assimilation number for these communities was always <1. A positive (r >0.4) correlation was found between the primary production of the eupsammon and the psammolittoral phytoplankton, and the concentration of NH4-N, NO3-N, Ntot, PO4-P, Ptot. and K+ in the piezometer groundwater. No correlation was found between primary production, chlorophyll a concentration and the concentration of nutrients and major ions in the piezometer groundwater and psammolittoral water.

Bacterial abundance and production, and their relation to primary production in tropical coastal waters of Peninsular Malaysia

2008 ◽  
Vol 59 (1) ◽  
pp. 10 ◽  
Author(s):  
Choon Weng Lee ◽  
Chui Wei Bong
Keyword(s):  
Primary Production ◽  
Chlorophyll A ◽  
Coastal Waters ◽  
Bacterial Production ◽  
Bacterial Abundance ◽  
Net Primary Production ◽  
Correlation Coefficients ◽  
Peninsular Malaysia ◽  
Chl A ◽  
The Relationship

In the present study, the relationship between bacteria and phytoplankton in tropical coastal waters was investigated. The bacterial abundance, bacterial production, chlorophyll a concentration and net primary production were measured at several locations in the coastal waters of Peninsular Malaysia. Chlorophyll a concentration ranged from 0.40 to 32.81 μg L–1, whereas bacterial abundance ranged from 0.1 to 97.5 × 106 cells mL–1. Net primary production ranged from 8.49 to 55.95 μg C L–1 h–1, whereas bacterial production ranged from 0.17 to 70.66 μg C L–1 h–1. In the present study, the carbon conversion factor used to convert bacterial production (cells mL–1 h–1) into carbon units ranged from 10 to 32.8 fg C cell–1, and was estimated from the bacterial size distribution measured at each location. Both phototrophic and heterotrophic biomass (bacteria–chlorophyll a) and activity (bacterial production–net primary production) were significantly correlated, although their correlation coefficients (r2) were relatively low (r2 = 0.188 and r2 = 0.218 respectively). Linear regression analyses provided the following equations to represent the relationship between: bacteria and chlorophyll a (Chl a), log Bacteria = 0.413 log Chl a + 6.057 (P = 0.003); and between bacterial production (BP) and net primary production (NPP), log BP = 0.896 log NPP – 0.394 (P = 0.004), which fitted with published results well. Comparison of annual carbon fluxes confirmed the prevalence of net heterotrophy in these coastal waters, and together with the low correlation coefficients, suggested the role of allochthonous organic matter in supporting heterotrophic activity.

scholarly journals Contrasting patterns of carbon cycling and dissolved organic matter processing in two phytoplankton–bacteria communities

2021 ◽  
Vol 18 (24) ◽  
pp. 6589-6616
Author(s):  
Samu Elovaara ◽  
Eeva Eronen-Rasimus ◽  
Eero Asmala ◽  
Tobias Tamelander ◽  
Hermanni Kaartokallio
Keyword(s):  
Primary Production ◽  
Bacterial Production ◽  
Bacterial Biomass ◽  
Community Respiration ◽  
Exponential Growth Phase ◽  
Bacterial Respiration ◽  
Organic C ◽  
Optical Signals ◽  
C Cycle ◽  
Microbial Consumption

Abstract. Microbial consumption of phytoplankton-derived organic carbon in the pelagic food web is an important component of the global C cycle. We studied C cycling in two phytoplankton–bacteria systems (non-axenic cultures of a dinoflagellate Apocalathium malmogiense and a cryptophyte Rhodomonas marina) in two complementary experiments. In the first experiment we grew phytoplankton and bacteria in nutrient-replete conditions and followed C processing at early exponential growth phase and twice later when the community had grown denser. Cell-specific primary production and total community respiration were up to 4 and 7 times higher, respectively, in the A. malmogiense treatments. Based on the optical signals, accumulating dissolved organic C (DOC) was degraded more in the R. marina treatments, and the rate of bacterial production to primary production was higher. Thus, the flow of C from phytoplankton to bacteria was relatively higher in R. marina treatments than in A. malmogiense treatments, which was further supported by faster 14C transfer from phytoplankton to bacterial biomass. In the second experiment we investigated consumption of the phytoplankton-derived DOC by bacteria. DOC consumption and transformation, bacterial production, and bacterial respiration were all higher in R. marina treatments. In both experiments A. malmogiense supported a bacterial community predominated by bacteria specialized in the utilization of less labile DOC (class Bacteroidia), whereas R. marina supported a community predominated by copiotrophic Alpha- and Gammaproteobacteria. Our findings suggest that large dinoflagellates cycle relatively more C between phytoplankton biomass and the inorganic C pool, whereas small cryptophytes direct relatively more C to the microbial loop.

scholarly journals Temporal coherence among tropical coastal lagoons: a search for patterns and mechanisms

2010 ◽  
Vol 70 (3 suppl) ◽  
pp. 803-814 ◽  
Author(s):  
A. Caliman ◽  
LS. Carneiro ◽  
JM. Santangelo ◽  
RD. Guariento ◽  
APF. Pires ◽  
...  
Keyword(s):  
Water Temperature ◽  
Chlorophyll A ◽  
Coastal Lagoons ◽  
Temporal Coherence ◽  
Structure And Function ◽  
Tropical Ecosystems ◽  
Water Colour ◽  
Chlorophyll A Concentration ◽  
Biological Variables ◽  
And Function

Temporal coherence (i.e., the degree of synchronicity of a given variable among ecological units within a predefined space) has been shown for several limnological features among temperate lakes, allowing predictions about the structure and function of ecosystems. However, there is little evidence of temporal coherence among tropical aquatic systems, where the climatic variability among seasons is less pronounced. Here, we used data from long-term monitoring of physical, chemical and biological variables to test the degree of temporal coherence among 18 tropical coastal lagoons. The water temperature and chlorophyll-a concentration had the highest and lowest temporal coherence among the lagoons, respectively, whereas the salinity and water colour had intermediate temporal coherence. The regional climactic factors were the main factors responsible for the coherence patterns in the water temperature and water colour, whereas the landscape position and morphometric characteristics explained much of the variation of the salinity and water colour among the lagoons. These results indicate that both local (lagoon morphometry) and regional (precipitation, air temperature) factors regulate the physical and chemical conditions of coastal lagoons by adjusting the terrestrial and marine subsidies at a landscape-scale. On the other hand, the chlorophyll-a concentration appears to be primarily regulated by specific local conditions resulting in a weak temporal coherence among the ecosystems. We concluded that temporal coherence in tropical ecosystems is possible, at least for some environmental features, and should be evaluated for other tropical ecosystems. Our results also reinforce that aquatic ecosystems should be studied more broadly to accomplish a full understanding of their structure and function.

The Coupling of Heterotrophic Bacterial and Phytoplankton Production in a Hypertrophic, Shallow Prairie Lake

1994 ◽  
Vol 51 (10) ◽  
pp. 2219-2226 ◽  
Author(s):  
Richard D. Robarts ◽  
Michael T. Arts ◽  
Marlene S. Evans ◽  
Marley J. Waiser
Keyword(s):  
Primary Production ◽  
Bacterial Production ◽  
Thymidine Incorporation ◽  
Chlorophyll Concentration ◽  
Bacterial Biomass ◽  
Cyanobacterial Blooms ◽  
Dominant Factor ◽  
Phytoplankton Production ◽  
Carbon Production ◽  
Prairie Lakes

Data from hypertrophic Humboldt Lake (Zmax = 6 m), Saskatchewan, support published studies indicating that bacterial numbers and production do not increase proportionally with chlorophyll concentration and primary production. There was no compensation for these relationships with increased bacterial production per cell, but our data showed an increase in production per unit bacterial biomass (273 fmol TdR∙μg C−1∙h−1). Bacterial production (19.8–422 mg C∙m−2∙d−1) was correlated with primary production (r = 0.76), and maximum bacterial production coincided with summer cyanobacterial blooms. Water temperature was a dominant factor correlated with bacterial production (r = 0.85) and growth (r = 0.92). Depending upon the factors used to convert the rate of thymidine incorporation to gross carbon production, heterotrophic bacterial production was able to consume an average of 42% (408 mg C∙m−2∙d−1) to 67% (653 mg C∙m−2∙d−1) of plankton primary productivity. Based on these calculations, hypertrophic prairie lakes might accumulate autochthonously produced organic carbon, but this conclusion takes no account of benthic bacterial production which could be high in shallow lakes.

Satellite estimation of chlorophyll-a concentration and phytoplankton primary production in the Sea of Azov

2010 ◽  
Vol 432 (1) ◽  
pp. 216-219 ◽  
Author(s):  
G. G. Matishov ◽  
V. V. Povazhnyi ◽  
S. V. Berdnikov ◽  
W. J. Moses ◽  
A. A. Gitelson
Keyword(s):  
Primary Production ◽  
Chlorophyll A ◽  
Sea Of Azov ◽  
Phytoplankton Primary Production ◽  
Chlorophyll A Concentration ◽  
The Sea Of Azov
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