2007
DOI: 10.1007/s11270-007-9554-2
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Are Pseudokirchneriella subcapitata and Chlorella vulgaris Affected by Environmental Samples from a Rice Field?

Abstract: Rice fields represent important production rates in Portugal. However, the intensive soil management and the exploitation of agrochemicals may pose a threat to nontarget organisms. Hence, the present work regards the toxicity screening of surface waters and sediment elutriates collected during the drainage of fields in the vicinity of a rice paddy (Quinta do Seminário, Soure, Portugal): 1. in River Pranto (RP), the river from which the field irrigation water is canalized; 2. inside the rice paddy, from the mai… Show more

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Cited by 8 publications
(4 citation statements)
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“…The strain Aphanizomenon gracile UADFA16 was isolated from the eutrophic shallow Vela Lake near Quiaios village, Figueira-da-Foz (44°58 0 N, 5°18 0 W, central-western Portugal) in the summer of 2007, and was chosen to infer and clarify taxonomic relationships with other studied strains. The study area details of sampled rice fields were similar to those described by Marques et al (2008), and Vela Lake biotic and abiotic characteristics were extensively monitored previously (de Figueiredo et al, 2006). The samples from rice fields and Vela Lake were collected in situ according to the methodologies described in Galhano et al (2009) andde Figueiredo et al (2006), respectively.…”
Section: Cyanobacterial Isolation and Culture Conditionsmentioning
confidence: 99%
“…The strain Aphanizomenon gracile UADFA16 was isolated from the eutrophic shallow Vela Lake near Quiaios village, Figueira-da-Foz (44°58 0 N, 5°18 0 W, central-western Portugal) in the summer of 2007, and was chosen to infer and clarify taxonomic relationships with other studied strains. The study area details of sampled rice fields were similar to those described by Marques et al (2008), and Vela Lake biotic and abiotic characteristics were extensively monitored previously (de Figueiredo et al, 2006). The samples from rice fields and Vela Lake were collected in situ according to the methodologies described in Galhano et al (2009) andde Figueiredo et al (2006), respectively.…”
Section: Cyanobacterial Isolation and Culture Conditionsmentioning
confidence: 99%
“…Wetland contamination could result in a die-off of most algal species present, causing a severe decline in this food source; alternatively, certain species or groups of algae could be selectively inhibited (Ferraz et al, 2004). An in vitro toxicity bioassay screening conducted by Marques et al (2008) on surface waters and sediment elutriates proceeding from River Pranto waters, which irrigate Western Portugal's rice fields, as well as on the irrigated rice fields in "Quinta do Seminário" (Soure, Portugal), revealed that Pseudokirchneriella subcapitata was more sensitive to the overall physico-chemical conditions in natural samples than Chlorella vulgaris, its growth being inhibited under water samples from both sites. In addition, these authors found that water samples, mainly those from the main irrigation/drainage channel of the rice fields, were more deleterious to microalgae than those from River Pranto or any of the elutriates.…”
Section: Herbicide Use and Predominant Weeds In Irrigated Rice Fieldsmentioning
confidence: 99%
“…Local rice fields are abundantly fertilized and a variety of pesticides, including herbicides, are intensively and sometimes indiscriminately used in weed control programs. The application of agrochemicals occurs mainly during the end of April up to June, but additional amounts of fertilizers or pesticides are added along the whole cropping season, depending on the type of culture demands and on the rice crop regional conditions (Marques et al, 2008).…”
Section: Herbicide Effects On Non-target Cyanobacteria: the Case Studmentioning
confidence: 99%
“…The unicellular algae Pseudokirchneriella subcapitata was selected as a test organism, since some studies on water pollution showed that it is the most broadly sensitive test organism for assays of elutriates as well as surface waters and ground samples (Hsieh et al 2006;Labra et al 2007;Marques et al 2008). Synergism or antagonism among chromium, TCE and PCE were evaluated by measuring growth rate and metabolic activity of P. subcapitata by fluorescein diacetate (FDA) esterase test.…”
Section: Introductionmentioning
confidence: 99%