Distribution of pelagic blue-green algae in the North Pacific Ocean

Marumo, Ryuzo; Asaoka, Osamu

doi:10.1007/bf02112896

Cited by 46 publications

(20 citation statements)

References 6 publications

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“…Blooms are most conspicuous in calm conditions, with trichomes forming dense mats or rafts on the surface of the ocean. Calm conditions at sea and water temperatures <21 C assist the formation of bloom (Marumo and Asaoka, 1974;Carpenter and Price, 1976;Carpenter and Romans, 1991;Suvapepun, 1992). Most marine cyanobacteria exist in temperatures ranging from À5 C to 35 C, exhibiting temperature optima somewhere in the range of 25e35 C (Fogg et al, 1973).…”

Section: Discussionmentioning

confidence: 99%

Trichodesmium erythraeum (Ehrenberg) bloom along the southwest coast of India (Arabian Sea) and its impact on trace metal concentrations in seawater

Krishnan

Krishnakumar

Rajagopalan

2007

Estuarine, Coastal and Shelf Science

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The incidence of a large scale Trichodesmium erythraeum bloom along the southwest coast of India (Arabian Sea) observed in May 2005 is reported. Around 4802 filaments of T. erythraeum ml À1 seawater was observed and a colony consisted of 3.6 Â 10 5 cells. The bloom was predominant off Suratkal (12 59 0 N and 74 31 0 E) with a depth of about 47 m, covering an area of 7 km in length and 2 km width. The concentrations of Zinc, Cadmium, Lead, Copper, Nickel and Cobalt were determined in samples collected from the bloom and non-bloom sites using stripping voltammetry. The observed hydrographical and meteorological parameters were found to be favorable for the bloom. The concentrations of Zinc, Cadmium and Nickel were found to be higher at bloom stations, while the concentrations of Lead, Copper and Cobalt were found to be very low at bloom stations. Elevated concentrations of Cadmium and Cobalt were observed at Valappad mainly due to the decomposition of detrital material produced in the bloom. Statistically significant differences (P > 0.01) in metal concentrations between the bloom and nonbloom stations were not observed except for Copper. Metals such as Lead, Copper and Cobalt were removed from the seawater at all places where bloom was observed. Cadmium was found to be slowly released during the decaying process of the bloom.

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Section: Discussionmentioning

confidence: 99%

Trichodesmium erythraeum (Ehrenberg) bloom along the southwest coast of India (Arabian Sea) and its impact on trace metal concentrations in seawater

Krishnan

Krishnakumar

Rajagopalan

2007

Estuarine, Coastal and Shelf Science

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“…Although an abundance of Trichodesmium spp. and R. intracellularis has been demonstrated in the western North Pacific, in particular, the Kuroshio Current and the marginal seas (Marumo and Asaoka 1974;Saino 1977;Gó mez et al 2005), little is known about the distribution and N 2 fixation activity of nano-and picoplanktonic diazotrophs.…”

mentioning

confidence: 99%

Latitudinal distribution of diazotrophs and their nitrogen fixation in the tropical and subtropical western North Pacific

Kitajima

Furuya

Hashihama

et al. 2009

Limnology & Oceanography

115

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Latitudinal distribution of diazotrophs and their nitrogen (N 2 ) fixation activity were investigated in the western North Pacific in winter (Nov to Dec 2004) and summer (May to Jun 2005) along meridional transects from 37uN to the equator. N 2 fixation activity in whole seawater and seawater passed through a 10-mm filter was assayed by acetylene reduction. The whole-water N 2 fixation was markedly elevated in winter throughout the study area compared to that in summer, probably due to the increased upward supply of phosphate as a result of deeper mixed layer in winter. During both periods a distinct latitudinal variation was observed in N 2 fixation of the whole-water samples at the surface; further, higher activity was observed between the Kuroshio Extension and the salinity front in the North Equatorial Current than in the neighboring areas. The elevated N 2 fixation was primarily ascribed to ,10-mm diazotrophs during both seasons. Flow cytometry conducted in summer revealed that distribution of nanoplanktonic cyanobacteria was closely correlated with that of N 2 fixation activity in the ,10-mm fraction, indicating that nanoplanktonic cyanobacteria were the major diazotrophs in that area. In contrast, microplanktonic diazotrophs, Trichodesmium spp. and Richelia intracellularis exhibited different latitudinal distributions from that of nanoplanktonic cyanobacteria, with maximum numerical abundance of R. intracellularis around 8uN and 30uN, and that of Trichodesmium spp. at 26.5uN. Few microplanktonic diazotrophs occurred in the winter. The distribution of the diazotrophs and their N 2 fixation activity may be controlled by the supply of phosphate and aeolian dust deposition.

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“…In marine systems, there are just a few dominant genera. In a field study in the Pacific Ocean [35], there was no correlation between the salinity and the abundance of cyanobacteria and no cyanobacteria were found in the cooler, less saline waters. In this model (Eq.…”

Section: Cb Versus Salinitymentioning

confidence: 91%

“…There are also reports that cyanobacteria have a requirement of temperatures of about 20-21 ºC to form blooms. Those reports are from a freshwater lake in Canada [34], the North Pacific Ocean [35] and an estuary in Australia [36]. The optimal growth temperatures in laboratory experiments are usually around 25 ºC for many species [31,33,37], but these experiments often use species from temperate areas.…”

Section: Cb Versus Temperaturementioning

confidence: 99%

A New General Approach to Quantify Nitrogen Fixation Exemplified for the Baltic Proper

Håkanson¹,

Hytteborn²,

Bryhn³

2009

TOMBJ

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This work uses empirical data from the HELCOM database and a new empirically-based model to predict the concentration of cyanobacteria in the Baltic Proper. The aim has been to estimate nitrogen fixation. The inherent variabilities/patchiness in the variables regulating nitrogen fixation are great. This means that different approaches may provide complementary information so that several relatively uncertain estimates may together provide less uncertainty in the estimate for nitrogen fixation in a given system. We show that there is marked variability in nitrogen fixation among different years (a factor of 20 between the year 2001 with the smallest value and 2005 with the highest value of about 900 kt/yr of N-fixation). The mean value for the period from 1997 to 2005 was 190 kt/yr. TN/TP based on median monthly data has been higher than the Redfield ratio of 7.2 since 1994. 6.5% of all individual data (n = 3001) from the surface-water layer (44 m) in the Baltic Proper for samples with temperatures higher than 15°C (when risks of getting cyanobacteria blooms are favoured) have TN/TP lower than 7.2. The mean TN/TP is 20 for surface-water sites with temperatures higher than 15°C, indicating that the average trophic conditions in the Baltic Proper are likely more limited by phosphorus than nitrogen. Nitrogen fixation is an important contributor to the nitrogen concentration and we give overall budgets for nitrogen and phosphorus in the Baltic Proper, including nutrient data from land uplift, which is the most important contributor for nutrients and often neglected in discussions about sources of nutrients to the Baltic Sea.

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Distribution of pelagic blue-green algae in the North Pacific Ocean

Cited by 46 publications

References 6 publications

Trichodesmium erythraeum (Ehrenberg) bloom along the southwest coast of India (Arabian Sea) and its impact on trace metal concentrations in seawater

Trichodesmium erythraeum (Ehrenberg) bloom along the southwest coast of India (Arabian Sea) and its impact on trace metal concentrations in seawater

Latitudinal distribution of diazotrophs and their nitrogen fixation in the tropical and subtropical western North Pacific

A New General Approach to Quantify Nitrogen Fixation Exemplified for the Baltic Proper

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