Biomass characterization of Azolla filiculoides grown in natural ecosystems and wastewater

Costa, Marta; Santos, M. Conceição; Carrapiço, Francisco

doi:10.1007/978-94-017-0922-4_48

Cited by 26 publications

(34 citation statements)

References 2 publications

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“…and the probability of finding pleustonic ostracods need further attention. According to Costa et al (1999), Azolla sp. is unique among the floating macrophytes in that it can grow in water lacking nitrogen compounds with sufficient phosphate present, owing to a symbiosis with the nitrogen-fixing cyanobacterium Anabaena azollae, a species that lives in the dorsal lobules of the macrophyte's leaves.…”

Section: Discussionmentioning

confidence: 98%

Dynamics of pleustonic ostracod populations in small ponds on the Island of Martín García (Río de la Plata, Argentina)

2011

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The biogeography and ecological preferences of Neotropical freshwater ostracods are poorly known, and more so the dynamics of populations and habitat selection of species living in pleustonic environments of temporary ponds. In the present survey we analyze the population changes of ostracods living in pleustonic environments of small freshwater bodies on Martín García Island (Río de la Plata, Argentina). Between June 2005 and June 2007, monthly samples of floating vegetation from eight different ponds on the island were collected, and limnological parameters were measured in situ. The results of multivariate logistic regression showed that the presence of ostracods was significantly related to high dissolved oxygen content and high water temperature. In addition, multivariate regression analysis indicated that, when ostracods were present, their total abundance was negatively related to floating vegetation dry weight. Four ostracod species were found: Strandesia bicuspis, Chlamydotheca incisa, Cypridopsis vidua, and Bradleytriebella trispinosa. The seasonal variation in abundances indicated that populations of the most common species, S. bicuspis and C. incisa, were denser during the summer and autumn months. The results of canonical correspondence analysis showed that individuals of S. bicuspis were more abundant at higher temperatures and lower conductivity than C. incisa. Further research is needed to clarify the observed negative correlation between floating vegetation dry weight and ostracod density and the possible differential thermal preference of the two species studied.

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Section: Discussionmentioning

confidence: 98%

Dynamics of pleustonic ostracod populations in small ponds on the Island of Martín García (Río de la Plata, Argentina)

2011

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“…Salvinia minima was able to grow in diluted anaerobic effluents from digested pig waste. Duckweed has also been reported to be able to grow in such kind of effluents (Hernández et al, 1997) although it is worth noticing that other aquatic floating plants such as Azolla filiculoides has been found to grow well in partially treated domestic wastewater, but not in diluted pig wastes (Costa, Santos, & Carrapico, 1999). However, the productivity of S. minima, was found to decrease as the initial ammonium concentration increased, in both media, PWAE and Hunter medium with ammonium sulphate, although the inhibitory effect of the highest ammonium concentration (140 mg l −1 ) was particularly evident in the PWAE.…”

Section: Discussionmentioning

confidence: 97%

Assessment of the Phytoremediation Potential of Salvinia minima Baker Compared to Spirodela polyrrhiza in High-strength Organic Wastewater

Olguín

Sánchez-Galván

Pérez-Pérez

2007

Water Air Soil Pollut

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Salvinia minima combines several advantages for being used in aquatic phytoremediation. The objectives of this work were to compare the growth kinetics and productivity of S. minima and Spirodela polyrrhiza in high-strength synthetic organic wastewater (HSWW) and to evaluate the growth characteristics of S. minima in various culture media, including anaerobic effluents from pig wastewater (PWAE). It was found that the Relative Growth Rate (RGR) of S. minima was significantly higher (p<0.05) compared to the RGR of S. polyrrhiza in Hutner Medium (HM) and in HSWW. Also, S. minima showed a 1.5 fold productivity and a 2.3 fold productivity, compared to S. polyrrhiza in HM and HSWW, respectively. Diauxic growth of S. minima was observed preferentially under pH control and there was a simultaneous consumption of two nitrogen sources. Productivity of S. minima was similar in pig waste anaerobic effluents (PWAE) and in HM without ammonium nitrate and amended with ammonium sulphate (MHM+AS), at an initial NH 4 concentration of 35 mg l −1 . Above this level, the productivity was found to decrease as the initial ammonium concentration increased, in both media. Growth was completely inhibited at 140 mg l −1 in the PWAE. In summary, S. minima is a better option than S. polyrrhiza for treating high-strength organic wastewater and lagoons should be operated at a maximum initial ammonium-nitrogen concentration of 70 mg l −1 and at a pH of 5.0 or 6.0. Likewise, the initial density should be maintained in the range of 7 to 15 g dw m −2 .

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“…The latter enable high performance for some specific metabolic reactions of the symbionts, namely nitrogen fixation, ammonium and hydrogen production by the immobilized cyanobiont 4 . Further, the use of Azolla as wastewater biofilter 5 and in biologically based life support systems (BLSS) incorporated in bioregenerative space devices are now in progress in several laboratories 6 . prokaryotic organisms: one species of nitrogen-fixing filamentous cyanobacteria -Anabaena azollae Strasb.…”

Section: Introductionmentioning

confidence: 99%

<title>Azolla-anabaena-bacteria system as a natural microcosm</title>

Carrapiço¹

2002

SPIE Proceedings

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Azolla is an aquatic fern that contains a permanent endosymbiotic prokaryotic community (cyanobacteria and bacteria) inside of the cavity in the leaf dorsal lobe of the pteridophyte. This is a unique situation and can be seen as a microcosm inside of an organism and also can be considered a good example of a living model for biological and environmental studies. These symbionts are specific of this symbiosis and lives immobilized in a mucilaginous fibrillar network, which fills part of the cavity. The symbionts works as immobilized organisms in a natural system that can be used as a model for biotechnological research and in biologically based life support systems. The nature and the complexity of this system is simultaneously a reference and a challenge for the research in the communication between the two levels of nature organization (microcosm and mesocosm), and can also be used as a reference for the design of new environmental engineered symbiotic systems that include man as a prelude to life in space.

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Biomass characterization of Azolla filiculoides grown in natural ecosystems and wastewater

Cited by 26 publications

References 2 publications

Dynamics of pleustonic ostracod populations in small ponds on the Island of Martín García (Río de la Plata, Argentina)

Dynamics of pleustonic ostracod populations in small ponds on the Island of Martín García (Río de la Plata, Argentina)

Assessment of the Phytoremediation Potential of Salvinia minima Baker Compared to Spirodela polyrrhiza in High-strength Organic Wastewater

<title>Azolla-anabaena-bacteria system as a natural microcosm</title>

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