Alkaline phosphatase activity detected in distinct phytoplankton communities in the northern Gulf of Alaska

Peacock, Melissa B.; Kudela, R. M.

doi:10.3354/meps10069

Cited by 7 publications

(2 citation statements)

References 59 publications

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“…The average APA in the G5 group was 0.0095 mmol·L −1 ·h −1 , which was significantly higher than that in other groups. This indicated that M. aeruginosa could utilize macromolecule organic P by releasing alkaline phosphatase, but alkaline phosphatase had no effect on small molecule organic P and inorganic P. This conclusion was similar to that in related studies [50].…”

Section: Discussionsupporting

confidence: 89%

Degradation Characteristics of Phosphorus in Phytoplankton-Derived Particulate Organic Matter and Its Effects on the Growth of Phosphorus-Deficient Microcystis aeruginosa in Lake Taihu

Kong

Chao

Han

et al. 2019

IJERPH

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To illustrate the contribution of phytoplankton-derived particulate organic matter (PPOM) to endogenous phosphorus (P) cycling and its effects on cyanobacteria blooms, PPOM characteristics, the degradation mechanism, and the growth of P-deficient Microcystis aeruginosa were studied in Lake Taihu. Results showed that PPOM is the most important P pool in the water column during cyanobacteria bloom, accounting for more than 80% of the total P (TP) in the water. During PPOM degradation, the particulate orthophosphate (Ortho-P) is the main species of P release from PPOM in the early degradation stage. The variations of polyphosphate (Poly-P) and phosphodiesters (Diester-P) contents were most significant, which were degraded completely within four days and eight days. Cell density and growth rate of M. aeruginosa using PPOM as P source were similar to those growing on Na2HPO4. The above results show that P in PPOM can be converted into available P by degradation, thus promoting the growth of M. aeruginosa. Therefore, the contribution of P release from PPOM degradation needs to be paid attention to in lake eutrophication control in the future.

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Section: Discussionsupporting

confidence: 89%

Degradation Characteristics of Phosphorus in Phytoplankton-Derived Particulate Organic Matter and Its Effects on the Growth of Phosphorus-Deficient Microcystis aeruginosa in Lake Taihu

Kong

Chao

Han

et al. 2019

IJERPH

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“…It is expected that different taxa would present diverse strategies for coping with P limitation, but even among the dinoflagellates, it is likely that there will be species with different physiological P status, despite being exposed to identical ambient concentrations of P i and DOP (Mackey et al, 2007(Mackey et al, , 2012Peacock and Kudela, 2013). Indeed, our bioassay reveals that even at the highest Pi concentrations some dinoflagellate species presented ELF.…”

Section: Species-specific P Nutrition Sourcesmentioning

confidence: 75%

Species-specific variation in the phosphorus nutritional sources by microphytoplankton in a Mediterranean estuary

et al. 2015

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We investigated the species-specific phosphorus (P) nutritional strategies in the microphytoplankton community in the Mahon estuary (Minorca, Western Mediterranean) in 2011, under two contrasting hydrographic scenarios. Estuarine flow, nutrient concentrations, phytoplankton community composition, and enzyme-labeled fluorescence (ELF) were measured in June and October, corresponding to the beginning and the end of summer. Dissolved inorganic nitrogen (DIN) and inorganic phosphate (P i ) exhibited enhanced concentrations in the inner estuary where N:P molar ratios suggested P-limitation in both surveys. P i was low and variable (0.09 ± 0.02 µmol L −1 in June and 0.06 ± 0.02 µmol L −1 in October), whereas organic phosphorus remained a more readily available P source. Even though ambient P i concentrations were slightly higher on June, when the microphytoplankton assemblage was dominated by dinoflagellates, the percentage of ELF labeled cells was notably higher (65 ± 9% of total cells) than in October (12 ± 10%), when the presence of diatoms characterized the microphytoplankton community. Alkaline phosphatase activity (AP) was mainly expressed by dinoflagellate taxa, whereas diatoms only displayed significant AP in the inner estuary during the June survey. A P-addition bioassay in which response of AP to P i enrichment was evaluated showed marked reduction in AP with increasing P i . However, some dinoflagellate species maintained AP even when P i was supplied in excess. We suggest that in the case of some dinoflagellate species AP is not as tightly controlled by ambient P i as previously believed. AP activity in these species could indicate selective use of organic phosphorus, or slow metabolic response to changes in P forms, rather than physiological stress to low P i availability. We emphasize the importance of identifying the species-specific phosphorus requirements and their capability for P assimilation in order to understand the contribution of microphytoplankton to the whole community response to biogeochemical perturbations.

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A review of carbon and phosphorus ratios in fresh water ecosystems dominated by phytoplankton: Effects of climate and geography

Ayub,

Su,

et al. 2024

Ecohydrology

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In freshwater systems, carbon, nitrogen, and phosphorus are essential macroelements. Changing ecological communities as a result of anthropogenic activity and climate change has become a global issue. C:P has been demonstrated to be a trustworthy and sensitive assay for detecting and monitoring single or multiple species in a wide range of samples. We look at how C:P can be utilized to manage and reduce eutrophication and harmful algal blooms (HABs) in freshwater environments in this review work. Recent research show how C:P has been shown to be a useful strategy for gathering complete data in freshwater ecosystem studies. The total number of papers in ScienceDirect from 2000 to 2023 with the terms “carbon and phosphorus ratios, fresh water ecosystems, and phytoplankton” in the title, abstract, or keywords was acquired for this review. Based on the number of published research demonstrating an increased understanding of the basic scientific concepts behind the carbon and phosphorus ratio, the overall temporal trend in publications on the ratio showed a steady growth. Compared to eutrophic Lake Victoria, which had a C:P of 149, mesotrophic Lakes Malawi and Kivu had a ratio of 263. Applying the carbon‐to‐phosphorus ratio to lake and reservoir eutrophication assessment is feasible, and the increasing C:P ratio serves as a prime indicator for the initiation of lake and reservoir reoligotrophication. Our findings establish the framework for future study into the relationship between organic nutrients and eutrophication, as well as the ecological ramifications of these relationships in freshwater systems. Furthermore, our prediction was that increases in C:P would change the structure of phytoplankton communities.

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Alkaline phosphatase activity detected in distinct phytoplankton communities in the northern Gulf of Alaska

Cited by 7 publications

References 59 publications

Degradation Characteristics of Phosphorus in Phytoplankton-Derived Particulate Organic Matter and Its Effects on the Growth of Phosphorus-Deficient Microcystis aeruginosa in Lake Taihu

Degradation Characteristics of Phosphorus in Phytoplankton-Derived Particulate Organic Matter and Its Effects on the Growth of Phosphorus-Deficient Microcystis aeruginosa in Lake Taihu

Species-specific variation in the phosphorus nutritional sources by microphytoplankton in a Mediterranean estuary

A review of carbon and phosphorus ratios in fresh water ecosystems dominated by phytoplankton: Effects of climate and geography

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