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231224s2008 xx |||||o 00| ||eng c |
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|a 10.1111/j.1529-8817.2007.00429.x
|2 doi
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|a eng
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| 100 |
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|a Vis, Chantal
|e verfasserin
|4 aut
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|a SHIFT FROM CHLOROPHYTES TO CYANOBACTERIA IN BENTHIC MACROALGAE ALONG A GRADIENT OF NITRATE DEPLETION(1)
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|c 2008
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|a Text
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|2 rdacontent
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|a ƒaComputermedien
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|a Date Completed 05.04.2016
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|a Date Revised 04.04.2016
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a © 2008 Phycological Society of America.
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|a A survey of the spatial distribution of benthic macroalgae in a fluvial lake of the St. Lawrence River (Lake Saint-Pierre, Quebec, Canada) revealed a shift in composition from chlorophytes to cyanobacteria along the flow path of nutrient-rich waters originating from tributaries draining farmlands. The link between this shift and changes in water quality characteristics was investigated by sampling at 10 sites along a 15 km transect. Conductivity, current, light extinction, total phosphorus (TP; >25 μg P · L(-1) ), and ammonium (8-21 μg N · L(-1) ) remained fairly constant along the transect in contrast to nitrate concentrations, which fell sharply. Filamentous and colonial chlorophytes [Cladophora sp. and Hydrodictyon reticulatum (L.) Bory] dominated in the first 5 km where nitrate concentrations were >240 μg N · L(-1) . A mixed assemblage of chlorophytes and cyanobacteria characterized a 1 km transition zone where nitrate decreased to 40-80 μg N · L(-1) . In the last section of the transect, nitrate concentrations dropped below 10 μg N · L(-1) , and cyanobacteria (benthic filamentous mats of Lyngbya wollei Farl. ex Gomont and epiphytic colonies of Gloeotrichia) dominated the benthic community. The predominance of nitrogen-fixing, potentially toxic cyanobacteria likely resulted from excessive nutrient loads and may affect nutrient and trophic dynamics in the river
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|a Journal Article
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|a Lyngbya
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|a benthic algae
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|a cyanobacteria
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|a macroalgae
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|a nitrogen
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|a river
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|a Cattaneo, Antonella
|e verfasserin
|4 aut
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|a Hudon, Christiane
|e verfasserin
|4 aut
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|i Enthalten in
|t Journal of phycology
|d 1966
|g 44(2008), 1 vom: 25. Feb., Seite 38-44
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|x 1529-8817
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|g volume:44
|g year:2008
|g number:1
|g day:25
|g month:02
|g pages:38-44
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