Contrasting experimental manipulations of the acidity of catchment drainage water: Effects on interactions between humic substances, iron, and phosphate

Shaw, Peter J.; Jones, R. I.; Haan, H. De

doi:10.1016/0160-4120(96)00052-9

Cited by 5 publications

(20 citation statements)

References 13 publications

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“…There is empirical evidence relating the strong association of phosphate and iron with dissolved material of high molecular weight in waters rich in humic substances (Shaw et al 2000). The ionic composition and pH of such Summary of the zooplankton community characteristics in five lakes on Chiloé Island waters also influence the speciation of iron and phosphate (Shaw et al 1996), making the chemical reactions more complex than those postulated for clear lakes. Thus, under certain conditions, humic substances can decrease the phosphate available to algae and in that way we could, in part, explain the low orthophosphate concentrations found in the lakes studied here.…”

Section: Discussionmentioning

confidence: 99%

A study of the river basins and limnology of five humic lakes on Chiloé Island

Villalobos

Parra²

2003

Rev. chil. hist. nat.

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From November 1996 to October 1997, the river basins of five humic lakes on Chiloé Island were studied monthly: Lakes Natri, Tepuhueico, Tarahuín, Huillinco and Cucao. The objective of this study was to know the catchment area, river basin and the main physical, chemical and biological characteristics of these humic lakes. The trophic status, the actual loading, and the mass balances of phosphorus and nitrogen were determined in relation to anthropogenic activities. Lakes Cucao and Huillinco were characterized by a marine influence. All the lakes had brown coloured waters, caused by humic substances, which limit their transparency. Lake Natri was the deepest (58 m), whereas Lake Tepuhueico had the shallowest depth (25 m). Total phosphorus and nitrogen fluctuated between 23.5 and 35 µg L -1 and 197 and 380 µg L -1 (annual average) in lakes Natri, Tepuhueico and Tarahuín, respectively. Lakes Cucao and Huillinco showed extremely high concentrations of total nitrogen (annual average => 3,000 µg L -1 ) and total phosphorus (= 223 and 497 µg L -1 ), and were classified as hyper-eutrophic. Lake Tarahuín registered the greatest diversity of phytoplankton, with 55 species, including Ceratium hirundinella which also occurred in lakes Cucao and Tarahuín. The diversity of the zooplankton community varied across these lakes. The presence of Diaptomus diabolicus (Tumeodiaptomus d. Dussart 1979) (Cucao, Huillinco and Tepuhueico) is noteworthy since this extends its geographical distribution to the south.Key words: river basin, limnological characterization, humic lakes, Chiloé, southern Chile. RESUMENDurante noviembre de 1996 y octubre de 1997 mensualmente se estudió la cuenca de cinco lagos húmicos localizados en la Isla de Chiloé: Lagos Natri, Tepuhueico, Tarahuín, Huillinco y Cucao. El estudio tuvo como objetivo conocer el área de la cuenca, la cuenca hidrográfica y las principales características físicas, químicas y biológicas de estos lagos húmicos. Se determinó el estado trófico, como también la carga actual y el balance másico de fósforo y nitrógeno total, en relación a actividades antrópicas. Los lagos Cucao y Huillinco se caracterizaron por presentar influencia marina. Todos los lagos tienen aguas de color marrón, causadas por las sustancias húmicas, que limitan la transparencia. El lago Natri es el más profundo (58 m), mientras que el Tepuhueico presentó la menor profundidad (25 m). Concentraciones de fósforo y nitrógeno total fluctuaron entre 23,5 y 35 µg L -1 y 197 y 380 µg L -1 en los lagos Natri, Tepuhueico y Tarahuín. Mientras que los lagos Cucao y Huillinco mostraron para el nitrógeno y fósforo concentraciones extremadamente altas, para el nitrógeno total (promedio anual > 3.000 µg L -1 ) y para el fósforo (223 y 496 µg L -1 ) clasificándolos como hipereutróficos. El lago Tarahuín registró la mayor diversidad fitoplanctónica con 55 especies. En los lagos Cucao y Tarahuín, destaca la presencia de Ceratium hirundinella. La comunidad zooplanctónica mostró diferencias en la diversidades de especies en los l...

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Section: Discussionmentioning

confidence: 99%

A study of the river basins and limnology of five humic lakes on Chiloé Island

Villalobos

Parra²

2003

Rev. chil. hist. nat.

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“…Tjeukemeer is a shallow, eutrophic lake with circumneutral to alkaline pH which does not undergo seasonal stratification and whose catchment comprises mainly peat-rich soils (De Haan, 1982;De Haan & De Boer, 1986). To ensure sterile conditions and permit direct comparison to previous studies (De Haan et al, 1990;Shaw et al, 1992;Shaw et al, 1996;Jones et al, 1993), NaN 3 was added to a concentration of 0.02% w/v (De Haan et al, 1990). To ensure sterile conditions and permit direct comparison to previous studies (De Haan et al, 1990;Shaw et al, 1992;Shaw et al, 1996;Jones et al, 1993), NaN 3 was added to a concentration of 0.02% w/v (De Haan et al, 1990).…”

Section: Methodsmentioning

confidence: 99%

“…It has been shown that free inorganic phosphate ions may associate with HS in the presence of iron (Eisenreich & Armstrong, 1980;De Haan, Jones & Salonen 1990;Shaw, De Haan & Jones, 1992;Jones, Shaw & De Haan, 1993;Shaw, Jones & De Haan, 1996); therefore sequestration of phosphate by HS in natural lake ecosystems could decrease the quantity of phosphate immediately available to phytoplankton. It has been shown that free inorganic phosphate ions may associate with HS in the presence of iron (Eisenreich & Armstrong, 1980;De Haan, Jones & Salonen 1990;Shaw, De Haan & Jones, 1992;Jones, Shaw & De Haan, 1993;Shaw, Jones & De Haan, 1996); therefore sequestration of phosphate by HS in natural lake ecosystems could decrease the quantity of phosphate immediately available to phytoplankton.…”

Section: Introductionmentioning

confidence: 99%

“…Despite the wealth of empirical evidence demonstrating the strong association of phosphate and iron with dissolved material of large molecular weight in humus-rich lake waters (Francko & Heath, 1979, 1982, 1983Eisenreich & Armstrong, 1980;Jones et al, 1988;Jones et al, 1993;De Haan et al, 1990;Shaw et al, 1992;Shaw et al, 1996), it remains to be established whether the presence of HS is a causal factor leading to this association. Different mechanistic models describing the interaction between phosphate and iron in the presence of HS (Shapiro, 1967;Schnitzer & Khan, 1972) have postulated that the presence of HS is a causative factor leading to the association of free inorganic phosphate and iron with material of larger molecular weight and yet there remains little evidence to support the validity of the mechanisms proposed.…”

Section: Introductionmentioning

confidence: 99%

“…Since both the ionic composition and pH of lake water influence the speciation of iron and phosphate to a large extent (De Haan et al, 1990;Shaw et al, 1992;Shaw et al, 1996;Jones et al, 1993), this hypothesis was tested using two lake waters of contrasting ionic strength and at different pH. Since both the ionic composition and pH of lake water influence the speciation of iron and phosphate to a large extent (De Haan et al, 1990;Shaw et al, 1992;Shaw et al, 1996;Jones et al, 1993), this hypothesis was tested using two lake waters of contrasting ionic strength and at different pH.…”

Section: Introductionmentioning

confidence: 99%

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The influence of humic substances on the molecular weight distributions of phosphate and iron in epilimnetic lake waters

Shaw¹,

Jones²,

Haan³

2000

Freshwater Biol

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1. The influence of humic substances on the association of free inorganic iron and phosphate with material of larger molecular weight was investigated in epilimnetic samples from two humus‐rich lakes of contrasting ionic strength. After modification of the molecular weight distribution of the humic substances in the samples using dialysis and ultrafiltration, the molecular weight distribution of added radioisotopes ( Fe3+ and PO43−) was assessed using gel filtration chromatography.  2. The association of Fe3+ and PO43− with larger molecular weight fractions (>50 000 and 10 000–50 000 Da) was not in general related to the quantity of humic substances of the same molecular weight in the samples. However, the proportions of Fe3+ and PO43− observed in higher molecular weight peaks were strongly correlated to the quantity of humic substances of the same molecular weight in (a) the 10 000–50 000 Da peak in the sample of low ionic strength at pH 5.5 and pH 7.0, and (b) the> 50 000 Da peak in the sample of higher ionic strength at pH 4.0.  3. It was concluded that humic substances promote the association of Fe3+ and PO43− with higher molecular weight fractions primarily by acting as peptizing agents for inorganic colloids containing Fe and P. Association of Fe3+ and PO43− with material of higher molecular weight via the formation of humic substance‐Fe3+–PO43− complexes was identified but only at specific pH and within specific molecular weight ranges for each of the epilimnetic lake water samples studied.

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