Alkaline phosphatase activities among planktonic communities in the northern Red Sea

Li, Hong; Veldhuis, Marcel J.W.; Post, Anton F.

doi:10.3354/meps173107

Cited by 146 publications

(132 citation statements)

References 31 publications

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“…In the Northern Gulf of Aqaba, another P-limited system, APA was shown to be correlated with abundance of Synechococcus sp. (Li et al 1998). APA can also be found in particle-free water, as it has a long lifetime when released from its extracellular location on phytoplankton cells (Li et al 1998); thus, in dynamic systems, a strong relationship to chl a would not be expected.…”

Section: Discussionmentioning

confidence: 99%

“…(Li et al 1998). APA can also be found in particle-free water, as it has a long lifetime when released from its extracellular location on phytoplankton cells (Li et al 1998); thus, in dynamic systems, a strong relationship to chl a would not be expected.The finding that DON and DOP may contribute differentially to the proliferation of cyanobacteria and other microbes in Florida Bay has important management implications. Our findings do not permit us at this point to identify the source of the organic nutrients, and in fact the variation in the δ 15 N values of particulate matter at the start of the bioassay experiments (Fig.…”

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confidence: 99%

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Evidence for dissolved organic nitrogen and phosphorus uptake during a cyanobacterial bloom in Florida Bay

Glibert¹,

Heil²,

Hollander³

et al. 2004

Mar. Ecol. Prog. Ser.

169

121

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Florida Bay, a shallow, seagrass-dominated bay in southern Florida, USA, receives significant nutrient inputs and has experienced seagrass losses and microalgal blooms within the last several decades. Inorganic nutrient inputs have been well characterized, but the role of organic nutrients, specifically of dissolved organic nitrogen (DON) and organic phosphorus (DOP), in supporting microbial processes in the bay is unknown. In this study various techniques were used to assess the importance of these nutrients along a transect in Florida Bay when a cyanobacterial bloom occurred in the central region in November 2002. These techniques included measurements of ambient particulate and dissolved nutrients, enzyme (urease and alkaline phosphatase) activities, and experiments to determine rates of 15 N uptake (nitrate, ammonium, urea, and amino acids over a period of 0.5 h) and long-term (48 h) changes in microbial biomass and 15 N natural abundance in enrichment bioassays. The cyanobacterial bloom in central Florida Bay was associated with the highest concentrations of DON and DOP, whereas the microflagellate-and diatom-dominated eastern bay region was associated with the highest concentrations of inorganic nutrients. The zeaxanthin:chlorophyll a ratio (an indicator of the relative contribution of cyanobacteria to phytoplankton biomass) was positively correlated with the rate of uptake of urea, and negatively correlated with the rate of uptake of inorganic nitrogen. The opposite pattern was observed for the fucoxanthin:chlorophyll a ratio (indicative of relative diatom biomass) and the peridinin:chlorophyll a ratio (indicative of relative photosynthetic dinoflagellate biomass), suggesting that different algal groups were using different N substrates. Biomass responses in the bioassay experiments showed that phytoplankton (as chlorophyll a) responded to DON additions in the western region and to DOP additions in the eastern region, but heterotrophic bacteria, in contrast, responded to DOP additions in the west and DON additions in the east. These findings thus demonstrate the potential for different sources of N, including DON, to stimulate different components of the algal community, and for the phytoplankton and bacteria to respond differently to N and P.KEY WORDS: Florida Bay · Cyanobacteria · Organic N · Organic P · Nutrient limitation · Urease · Alkaline phosphatase · Bioassay · Nutrient uptake rates Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 280: [73][74][75][76][77][78][79][80][81][82][83] 2004 changes. Since the onset of industrialization in the 1880s, the health of the Florida Bay ecosystem has been negatively impacted on both decadal (e.g. increasing eutrophication) and centurial (e.g. changes in land use and water management practices within southern Florida) time-scales (Fourqurean & Robblee 1999). These anthropogenic changes have led to a significant alteration in freshwater flow patterns within the Everglades, causing declines in seagrass d...

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Evidence for dissolved organic nitrogen and phosphorus uptake during a cyanobacterial bloom in Florida Bay

Glibert¹,

Heil²,

Hollander³

et al. 2004

Mar. Ecol. Prog. Ser.

169

121

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“…, Klinker et al 1978, Sommer 2000, Sommer et al 2002, 2) phytoplankton of the northern Red Sea are constituted mainly of ultraphytoplankton (Lindell & Post 1995, Li et al 1998, Yahel et al 1998 which are too small (Ͻ8 mm) to be manipulated by its mouth parts, 3) this species may change its food items opportunistically as in some other pontellid species (Ohtsuka & Onbé 1991), and 4) the number of analyzed specimens was too small to detect vegetative foods in their guts.…”

Section: ϫ3mentioning

confidence: 99%

Redescription of the poorly known calanoid copepod Pontella karachiensis Fazal-Ur-Rehman, 1973 from the Red Sea with notes on its feeding habits

El‐Sherbiny¹,

Ueda²

2008

Plankton Benthos Res

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“…We performed microscopic analysis of APA (Dyhrman et al 2002) by using Enzyme-Labeled Fluorescence 97 (ELF97), as well as conventional measurements of bulk APA (Li et al 1998, Fu & Bell 2003. ELF97 forms an insoluble fluorescent particle after hydrolysis, which enables visualiza-tion of APA.…”

Section: Introductionmentioning

confidence: 99%

Phosphate release due to excess alkaline phosphatase activity in <i>Trichodesmium erythraeum</i>

Yamaguchi

Furuya

Sato

et al. 2016

Plankton Benthos Res

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Abstract:We investigated the dependence of alkaline phosphatase activity (APA) on temperature and light intensity in cultured strains of the diazotroph Trichodesmium erythraeum isolated from the Kuroshio Current in the East China Sea. In contrast to the low levels of APA observed under phosphorus (P)-replete conditions, cultures grown under Plimited conditions exhibited strong APA, and the levels steadily increased with increases in temperature and irradiance from 22-30°C and 40-260 µmol m, respectively. Based on the chlorophyll a and APA levels in actively growing T. erythraeum, the mean hydrolyzing time required to double the cellular P quota was estimated to be 0.68 and 9.7 times shorter than the reported values under P-replete and P-limited conditions, respectively. This strongly suggests that APA under P-limited conditions is excessively active compared with the cellular P requirement. Furthermore, under P limitation intense bacterial aggregations were observed with fluorescence microscopy around the T. erythraeum trichomes in the same location as the visualized APA, suggesting enhancement of bacterial growth by surplus phosphate due to the excess APA, as well as possible release of dissolved organic matter from T. erythraeum. The present study suggests an important role for T. erythraeum as a phosphate supplier to other organisms in the oligotrophic ocean.

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Alkaline phosphatase activities among planktonic communities in the northern Red Sea

Cited by 146 publications

References 31 publications

Evidence for dissolved organic nitrogen and phosphorus uptake during a cyanobacterial bloom in Florida Bay

Evidence for dissolved organic nitrogen and phosphorus uptake during a cyanobacterial bloom in Florida Bay

Redescription of the poorly known calanoid copepod Pontella karachiensis Fazal-Ur-Rehman, 1973 from the Red Sea with notes on its feeding habits

Phosphate release due to excess alkaline phosphatase activity in <i>Trichodesmium erythraeum</i>

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