Bacterial secondary production in oxic and anoxic freshwaters

Cole, Jonathan J.; Pace, Michael L.

doi:10.4319/lo.1995.40.6.1019

Cited by 72 publications

(55 citation statements)

References 35 publications

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“…The hypolimnion layer shows a positive relation with DOC which is consistent with the results of Maki et al [24]. There is also an inverse relation with pH, related to increasing anoxic bacterial production, which causes pH reduction [25,26]. Variation of temperature and dissolved oxygen from the lake surface to 20 m depth during February 2011.…”

Section: Seasonal Analysissupporting

confidence: 79%

Distribution of heterotrophic bacteria and water quality parameters of Mosul Dam Lake, Northern Iraq

Khattab

Merkel

2012

Water Pollution XI

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Mosul Dam Lake is one of the largest artificial water reservoirs in Iraq, located in the north of the country. This lake is the main source of drinking water in Iraq, providing water to Mosul, Baghdad, and other cities. The surface area of the lake is 385 km 2 at the maximum operation level with a total storage volume of 11.13×10 9 m 3 . The climate of the study area is arid to semi arid, with rainfall not exceeding 300 mm/year. The highest temperature in summer reaches more than 55ºC. The lake is monomictic with overturn occurring in the autumn. The difference between the lake surface and bottom temperatures during the summer is more than 17°C (31 14°C) and 2°C during winter (12 10°C). Secchi disk measurements show that Mosul Dam Lake is mesotrophic; only the outlet of Dohuk River is eutrophic. In the current study, the standard plate count agar procedure was used for analyzing 45 samples for heterotrophic bacteria. These samples have been collected from different depths and locations in the study area during two sampling campaigns in February 2011 and July 2011. Water quality parameters (pH, EC, NO 3 , NO 2 , PO 4 , TIC, and DOC) for the same locations and depths of the sampled bacteria were measured. Results of heterotrophic bacteria analysis show that Mosul Dam Lake is contaminated with bacteria.The river Dohuk is the major source of this pollution. Occurrence of heterotrophic bacteria during the summer exceeds the winter values by 57%. In a layer located 12-15 m below the surface of the lake with a temperature of 10.9°C, a linear correlation between heterotrophic bacteria and water quality parameters (R 2 >0.7) in winter could be observed. However, with respect to phosphorous, a logarithmic relationship with heterotrophic bacteria can be seen. In the summer season, the heterotrophic bacteria had a clear relation with most water quality parameters (R 2 >0.7) at depths of between 40 and 60 m within the

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Section: Seasonal Analysissupporting

confidence: 79%

Distribution of heterotrophic bacteria and water quality parameters of Mosul Dam Lake, Northern Iraq

Khattab

Merkel

2012

Water Pollution XI

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“…Iriberri et al 1985, White et al 1991, Shiah & Ducklow 1994, Sherry et al 1999, no such relationship above 10°C was found by Scavia & Laird (1987) in Lake Michigan or by Cole & Pace (1995) in 9 North American lakes, and none was evident in Lake Kinneret.…”

Section: Bbp and Ppmentioning

confidence: 84%

“…At present we have no explanation for this discrepancy, although the question of the value assigned to the photosynthetic quotient in order to transform O 2 to C in this method is critical. White et al (1991) listed bacterial growth rates ranging from 0.017 to 8.7 d -1 for 10 eutrophic and 14 mesotrophic lakes, and Cole & Pace (1995) reported bacterial specific growth rates from 0.02 to 4.6 d -1 for a variety of freshwater and marine locations. The average bacterial growth rates for photic zone bacteria in Lake Kinneret (0.…”

Section: Cr and Gpp; Net Autotrophy And Net Hetrotrophy In The Phototmentioning

confidence: 99%

Planktonic community production and respiration and the impact of bacteria on carbon cycling in the photic zone of Lake Kinneret

Berman¹,

Parparov²,

Yacobi³

2004

Aquat. Microb. Ecol.

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“…With seasonally lower hypolimnetic O 2 concentrations, the likelihood of anoxia at the sediment level would increase, with potentially negative consequences to secondary benthic communities. Cole and Pace (1995) show that anoxic conditions lead to higher abundances of sediment bacteria, but a slower doubling time. It is suggested that this could lead to higher rates of organic matter preservation, which would be consistent with our own findings.…”

Section: Benthic Mineralizationmentioning

confidence: 99%

A regime shift from macrophyte to phytoplankton dominance enhances carbon burial in a shallow, eutrophic lake

et al. 2013

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Abstract. Ecological regime shifts and carbon cycling in aquatic systems have both been subject to increasing attention in recent years, yet the direct connection between these topics has remained poorly understood. A four-fold increase in sedimentation rates was observed within the past 50 years in a shallow eutrophic lake with no surface in-or outflows. This change coincided with an ecological regime shift involving the complete loss of submerged macrophytes, leading to a more turbid, phytoplanktondominated state. To determine whether the increase in carbon (C) burial resulted from a comprehensive transformation of C cycling pathways in parallel to this regime shift, we compared the annual C balances (mass balance and ecosystem budget) of this turbid lake to a similar nearby lake with submerged macrophytes, a higher transparency, and similar nutrient concentrations. C balances indicated that roughly 80% of the C input was permanently buried in the turbid lake sediments, compared to 40% in the clearer macrophyte-dominated lake. This was due to a higher measured C burial efficiency in the turbid lake, which could be explained by lower benthic C mineralization rates. These lower mineralization rates were associated with a decrease in benthic oxygen availability coinciding with the loss of submerged macrophytes. In contrast to previous assumptions that a regime shift to phytoplankton dominance decreases lake heterotrophy by boosting whole-lake primary production, our results suggest that an equivalent net metabolic shift may also result from lower C mineralization rates in a shallow, turbid lake. The widespread occurrence of such shifts may thus fundamentally alter the role of shallow lakes in the global C cycle, away from channeling terrestrial C to the atmosphere and towards burying an increasing amount of C.

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Bacterial secondary production in oxic and anoxic freshwaters

Cited by 72 publications

References 35 publications

Distribution of heterotrophic bacteria and water quality parameters of Mosul Dam Lake, Northern Iraq

Distribution of heterotrophic bacteria and water quality parameters of Mosul Dam Lake, Northern Iraq

Planktonic community production and respiration and the impact of bacteria on carbon cycling in the photic zone of Lake Kinneret

A regime shift from macrophyte to phytoplankton dominance enhances carbon burial in a shallow, eutrophic lake

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