Morphology and Physiology of <i>Lyngbya nigra</i> with Reference to Copper Toxicity

Gupta, Ajit; Arora, Asha

doi:10.1111/j.1399-3054.1978.tb08620.x

Cited by 13 publications

(6 citation statements)

References 24 publications

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“…There was a greater inhibition of photosynthesis than of growth in copper-treated Nitzschia palea (Steemann Nielsen & Wium-Andersen, 1971). Similar observations of potassium loss have been made by Mierle & Stokes (1976) in Scenedemus and by Gupta & Arora (1978) in Lyngbya nigra. Similar observations of potassium loss have been made by Mierle & Stokes (1976) in Scenedemus and by Gupta & Arora (1978) in Lyngbya nigra.…”

Section: (Ii) Coppersupporting

confidence: 87%

“…Like other heavy metals, copper also affects permeability of plasma membranes causing loss of potassium from algal cells (McBrien & Hassall, 1967;O'Kelly, 1974). Similar observations of potassium loss have been made by Mierle & Stokes (1976) in Scenedemus and by Gupta & Arora (1978) in Lyngbya nigra. The toxicity of copper to Chlorella pyrenoidosa has been shown to decrease after addition of potassium (Steemann Nielsen, Kamp-Nielsen & Wium-Andersen, 1969).…”

Section: (Ii) Coppersupporting

confidence: 87%

“…Higher concentrations are toxic, and for many years copper sulphate has been widely used as an algicide to control or prevent undesirable algal growths, particularly waterblooms. Copper inhibits growth as well as photosynthesis of algae (Gachter, 1976;O'Kelly, 1974;Thomas et al, 19773;Gupta & Arora, 1978;Whittaker, Barica, King & Buckley, 1978). There was a greater inhibition of photosynthesis than of growth in copper-treated Nitzschia palea (Steemann Nielsen & Wium-Andersen, 1971).…”

Section: (Ii) Coppermentioning

confidence: 99%

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Phycology and Heavy‐metal Pollution

1981

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Summary 1. All heavy metals, including those that are essential micronutrients (e.g. copper, zinc, etc.), are toxic to algae at high concentrations. 2. One characteristic feature of heavy‐metal toxicity is the poisoning and inactivation of enzyme systems. Many of the physiological and biochemical processes, viz., photosynthesis, respiration, protein synthesis and chlorophyll synthesis, etc., are severely affected at high metal concentrations. 3. Some algae inhabit waters chronically polluted with heavy‐metal‐laden wastes from mining and smelting operations; Nodularia sp., Oscillatoria sp., Cladophora sp., Hormidium sp., Fucus sp. and Laminaria sp., etc., occur in metal‐rich waters. These algal forms are probably more capable of combating the toxic levels of heavy metals and this attribute is a result of physiological and/or genetic adaptations. The sensitivity or tolerance to heavy metals varies amongst different algae. The phenomena of multiple tolerance and co‐tolerance may be exhibited by some algae. 4. Heavy‐metal pollution causes reduction in species diversity leading to the dominance of a few tolerant algal forms. The primary productivity also decreases after metal supplementation. 5. The uptake and accumulation of heavy metals can be active (energy‐dependent), passive (energy‐independent), or both. 6. Heavy metals can be safely stored as intranuclear complexes by some algae. Notwithstanding this, some changes in the cell wall can enable the algae to tolerate heavy metals by checking the entry of the metals (exclusion mechanism). 7. The metal content of algae growing in a waterbody may yield valuable information for simulating heavy metal pollution: several species of Cladophora and Fucus have been extensively used for this purpose. 8. Several factors affect and determine toxicity of heavy metals to algae. At low pH, the availability of heavy metals to algae is greatly increased, as a consequence of which pronounced toxicity is evident. Hard waters decrease metal toxicity. Some ions, e.g., calcium, magnesium and phosphorus, can alleviate toxicity of metals. 9. The presence of other metals can influence toxicity of a heavy metal through simple additive effect or by synergistic and antagonistic interactions. Similarly, other pollutants can influence heavy‐metal toxicity. 10. The toxicity of heavy metals depends upon their chemical speciation. Various ionic forms of a metal characterized by different valency states, may be differentially toxic to a test alga. 11. Amino acids, organic matter, humic acids, fulvic acid, EDTA, NTA, etc. can complex with heavy metals and render them unavailable. This may eventually lead to less toxicity. 12. Heavy‐metal toxicity largely depends upon algal population density: the denser the population the more numerous the cellular sites available, leading to decreased toxicity.

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Section: (Ii) Coppersupporting

confidence: 87%

Section: (Ii) Coppersupporting

confidence: 87%

Section: (Ii) Coppermentioning

confidence: 99%

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Phycology and Heavy‐metal Pollution

1981

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“…These results not only tentatively indicated that algal specimens from the two areas were physiologically similar, but also showed that the plants from the urban sites did not develop any obvious symptoms of metal toxicity. Metals in toxic amounts affect the permeability of the plasmalemma causing loss of potassium from (McBrien & Hassall, 1967), and distension of the algal cells (Gupta & Arora, 1978). There may also be a significant lowering of the photosynthetic pigment contents (Conway, 1978).…”

Section: Resultsmentioning

confidence: 99%

Ulva lactuca as bioindicator of metal contamination in intertidal waters in Hong Kong

1990

Hydrobiologia

115

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The use of Ulva lactuca L. as an indicator of metal contamination was assessed by analysing the levels of Mn, Fe, Ni, Cu, Zn, Cd and Pb in the alga collected from 24 intertidal sites around the Island of Hong Kong. Twelve of the sites are in the rural southern parts of the Island where the coastal waters are relatively clean. The remaining 12 sites are located in the north and within Victoria Harbour which receives, apart from industrial effluents, untreated domestic sewage from a population of some 3.5 million. The mean levels of Mn, Fe, Ni, Cu, Zn and Pb in Ulva from the urban sites were respectively 4.0, 4.6, 1.8,2.3,2.4 and 4.6 folds those from the rural sites. However, similar levels of Cd were found in the alga amongst all the sites. Locations of high levels of metal contamination, particularly to the eastern end of the Harbour, have been identified. Preliminary results indicate that Ulva is a good indicator of Mn, Fe, Cu, Zn and Pb contaminations.

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“…al., 1980;LAZINSKY;SICKO-GOAD, 1983;TORNQVIST;CLAESSON, 1987;GENSEMER, 1990;VISVIKI;RACHLIN, 1992;RODRIGUEZ et. al., 2011), and ultrastructures (GUPTA;ARORA, 1978;SHEHATA;BADR, 1980;HEUMANN, 1987) of algae. They changed (Cu, Cd, Cr, Ni, Zn) photosynthetic activity SINGH, 1987;RAIZADA, 1988;GUPTA, 1989;CHANG, 1991), respiration (Cu, Ni), carbon dioxide and other nutrients absorption (PETERSON et.…”

Section: Climatic Changes and Primary Productivitymentioning

confidence: 99%

Climatic changes, nutrient imbalance and primary productivity in aquatic ecosystems

Anastácio¹,

Azeiteiro²,

Pereira³

2012

TropOcean

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Propósito – É intuito dos autores, suportado por uma mini revisão de informação publicada, apresentar um cenário de possíveis consequências de alterações climáticas associadas a ciclos biogeoquímicos e à disponibilidade de nutrientes para o fitoplâncton e à inerente produção primária. Abordagem – Neste artigo assumem a possibilidade de que alterações associadas ao clima determinarão o desaparecimento de muitas espécies, uma redistribuição daquelas que prevalecerem, determinarão alterações na qualidade ambiental, assim como a alteração da qualidade e quantidade de massa e energia que estará disponível para os consumidores. Implicações – Alteração de fatores dos quais os produtores primários estão dependentes, a qualidade e quantidade de energia eletromagnética, a proporção de gases e a quantidade de poeiras em suspensão na atmosfera, alterações nos padrões de temperatura, a acidificação da hidrosfera, a introdução e ou remobilização de nutrientes e de substâncias tóxicas associadas aos ciclos biogeoquímicos e a exploração não sustentável de recursos, poderá reduzir o fluxo de energia para os níveis tróficos mais elevados, com possível impacto na segurança alimentar das populações à escala local, regional ou global. Originalidade – Os autores salientam as possíveis consequências na diversidade fitoplanctónica e na produtividade primária dos oceanos devido a um eventual abaixamento dos valores de pH associado à solubilização de dióxido de carbono na hidrosfera e à alteração no equilíbrio e na quantidade de nutrientes disponíveis. Palavras-chave: fitodiversidade; fitoplâncton; acidificação dos oceanos; metais, balanço de nutrientes; teia alimentar.

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Morphology and Physiology of Lyngbya nigra with Reference to Copper Toxicity

Cited by 13 publications

References 24 publications

Phycology and Heavy‐metal Pollution

Phycology and Heavy‐metal Pollution

Ulva lactuca as bioindicator of metal contamination in intertidal waters in Hong Kong

Climatic changes, nutrient imbalance and primary productivity in aquatic ecosystems

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