Secchi disk depth record: A claim for the eastern Mediterranean1

Berman, T.; Walline, P.; Schneller, A.; Rothenberg, Jeffrey M.; Townsend, D. W.

doi:10.4319/lo.1985.30.2.0447

Cited by 55 publications

(20 citation statements)

References 2 publications

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“…3). A 1985 observation of 53 m in the Eastern Mediterranean was claimed as a record (Berman et al 1985), but clearer waters (up to 62 m in the tropical Pacific Ocean) had earlier been reported (Man'kovskiy 1978). These visual clarities are seldom, if ever, approached in surface freshwaters.…”

Section: Claritymentioning

confidence: 93%

Optically pure waters in Waikoropupu ('Pupu') Springs, Nelson, New Zealand

Davies‐Colley

Smith

1995

New Zealand Journal of Marine and Freshwater Research

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We have made in situ observations of the optical properties of Waikoropupu ("Pupu") Springs, Nelson, New Zealand. Visual clarity was measured in the horizontal direction over a sight path "folded" using a plane mirror so as to accommodate the sighting range within the 35 m wide main springs basin. An average black-body visibility of 63 m was obtained, the highest yet reported for any fresh water, and close to the theoretical maximum for optically pure water. Measurements with a beam transmissometer were consistent with the visibility observations. As well as ranking among the very clearest waters in the world, these spring waters are virtually indistinguishable from pure water as regards their spectral irradiance attenuation in the ultraviolet and beam attenuation in the green region of the spectrum, undetectably low content of yellowcoloured organic material, and remarkable blueviolet colour.

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Section: Claritymentioning

confidence: 93%

Optically pure waters in Waikoropupu ('Pupu') Springs, Nelson, New Zealand

Davies‐Colley

Smith

1995

New Zealand Journal of Marine and Freshwater Research

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“…The Eastern Mediterranean Sea is one of the most oligotrophic regions on Earth, at least with respect to the distributions of suspended particulate and dissolved matter (Berman et al, 1985). Comprehensive field investigations conducted over the past few decades have suggested that P limits biological production in this region (Krom et al, 1991).…”

Section: Eastern Mediterranean Seamentioning

confidence: 99%

Dynamics of Dissolved Organic Phosphorus

Karl

Björkman

2015

Biogeochemistry of Marine Dissolved Organic Matter

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“…The pelagic waters of the Levantine Basin of the Eastern Mediterranean Sea have been shown to be among the most oligotrophic on record, with exceptionally low primary productivity (Berman et al 1984(Berman et al , 1986, chlorophyll and nutrient concentrations (Salihoglu et al 1990, and exceptionally deep light penetration (Berman et al 1985, Megard & Berman 1989). To our knowledge, data on the abundance of bacteria and heterotrophic nanoplankton, and on rates of bacterial production in this oligotrophic sea have not been published.…”

Section: Introductionmentioning

confidence: 99%

Bacterial numbers, bacterial production, and heterotrophic nanoplankton abundance in a warm core eddy in the Eastern Mediterranean

Zohary¹,

Robarts²

1992

Mar. Ecol. Prog. Ser.

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ABSTRACT. Bacterial numbers and production, and abundance of heterotrophic nanoplankton (HNAN) were recorded over 24 h at the core and boundary of the Cyprus Eddy, a warm-core eddy in the Levantine Basin of the Eastern Mediterranean Sea. The basin is known as one of the most oligotrophic on record. Bacterial numbers in the euphotic zone were close to the lower threshold value for bacterial abundance in the oceans, with means of 2.7 X 105 bacterla ml-' at the boundary and 4 . 9 X 105 ml-' at the core. Bacterial production, measured as the rate of DNA labelling by thymidine (TdR), ranged from 0.01 to 0.70 pm01 TdR 1-' h-', values which fall at the lower end of ranges reported from other freshwater and marine ecosystems. No diel cycles of bacterial numbers or rate of TdR incorporation were observed, but the TdR rate normalized to cell numbers showed marked diel variation with the highest rates usually found in early morning hours. HNAN were characteristically small (mostly < 3 pm in diameter) and more abundant in the core (37 to 850 cells ml-l) than in the boundary station (19 to 414 cells ml-l). The long bacterial doubling times (ca 50 d), and the parallel distribution of bacteria and HNAN, suggested low grazing pressure. A possible alternative food source for HNAN is prochlorophytes. Hlgher microbial standing crop and activity are anticipated in the core of the eddy In winter, when deep m~xing occurs.

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Secchi disk depth record: A claim for the eastern Mediterranean1

Cited by 55 publications

References 2 publications

Optically pure waters in Waikoropupu ('Pupu') Springs, Nelson, New Zealand

Optically pure waters in Waikoropupu ('Pupu') Springs, Nelson, New Zealand

Dynamics of Dissolved Organic Phosphorus

Bacterial numbers, bacterial production, and heterotrophic nanoplankton abundance in a warm core eddy in the Eastern Mediterranean

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