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  • 1
    Electronic Resource
    Electronic Resource
    Diatom communities as indicators of environmental stress in the Guadiamar River, S-W. Spain, following a major mine tailings spill (2000)
    Springer
    Journal of applied phycology 12 (2000), S. 113-124 
    Details
    ISSN: 1573-5176
    Keywords: diatom communities ; diatom indices ; diversity ; Doñana ; evenness ; Guadiamar ; heavy metals ; mine tailings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An accident in a mine tailings dam caused the outflowof mud and water rich in heavy metals in April 1998that flooded the Guadiamar River and its floodplain,in the vicinity of Doñana National Park. Theimpact on the periphytic communities was evaluated byanalyzing the evolution of the diatom communitiesafter seven (November 1998) and fourteen months (June1999) of the accident. The comparison between thereference and affected sites showed a shift from adiatom community dominated by Fragilariaconstruens, Achnanthes minutisssima and Amphora pediculus to another dominated by Nitzschia palea and Gomphonema parvulum. Thevalues for Shannon-Wiener diversity strongly decreasedin the affected area; changes between survey periodsfailed to show a marked recovery. However, evennesswas slightly higher for the June 1999 period,suggesting a slight improvement in the diatomcommunity. Diatom indices (IPS-IDG, Descy, CEE,Lange-Bertalot) were applied to the data. Values forthese also showed a marked decrease in water qualityat sites closest to the mine tailings spill, as wellas a progressive recovery downstream. Correlationanalyses between the diatom descriptors and theenvironmental variables confirmed that heavy metals inthe water and sediment had a marked and lasting effecton the diatom communities of the Guadiamar. Otherpollution events (e.g. `alpechin' sewage) probablyhindered recovery of the periphytic communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008197411815
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  • 2
    Electronic Resource
    Electronic Resource
    Algae in urban drinking waters in N.E. Spain (1995)
    Springer
    Journal of applied phycology 7 (1995), S. 455-460 
    Details
    ISSN: 1573-5176
    Keywords: algae ; drinking water ; distribution network
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Tap waters from Barcelona and several other locations in N.E. Spain were analyzed to determine the algal occurrence and to assess their probable origin and fate. In general, a low number of taxa (2–9) occurred per sample, while cell density was highly variable (from 20 to more than 1000 cells ml-1). Green algae were usually the most abundant, most of the taxa being common in natural phytoplankton assemblages from mesotrophic or eutrophic waters. The proportion of planktonic to benthic taxa differed between samples, there being only one sample (Lérida) with a predominant planktonic composition. Analysis of treated water revealed that algae were not completely removed at the end of the treatment, meaning that a low number could reach the distribution network. Moreover, other organisms (flagellates) had their origin in storage water tanks. No seasonal pattern of occurrence was apparent since there were many occasional taxa, implying a lack of direct connection between natural populations and tap water algae. It is therefore suggested that algae can reach the distribution network by several possible origins. Algae were sometimes viable; culture experiments showed occasional growth in June, but not in August samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00003929
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of removal of riparian vegetation on algae and heterotrophs in a Mediterranean stream (1997)
    Springer
    Journal of aquatic ecosystem stress and recovery 6 (1997), S. 129-140 
    Details
    ISSN: 1573-5141
    Keywords: riparian removal ; Mediterranean ; algae ; bacteria ; ectoenzymatic activities ; macroinvertebrates ; biomass ; productivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of removal of a riparian strip on aquaticautotrophic (algae) and heterotrophic (bacteria,macroinvertebrates) organisms was monitored in aMediterranean stream during the canopy growing period.Community composition, biomass and metabolicactivities were compared with those recorded during apre-riparian removal period and in a forested stretchdownstream. Higher irradiance was associated with Cladophora increase in the logged section. Algalbiomass increased up to ten times, and productivitywas up to four times higher than in the pre-removalperiod and the forested section. Bacterialcommunities showed higher ectoenzymatic activities(β-glucosidase, β-xylosidase) in thelogged section than in forested conditions. Moreoverthe coincidence between the maxima ofβ-glucosidase and chlorophyll-a suggeststhat bacterial activity was enhanced by the higheravailability of high-quality algal material. Themacroinvertebrate community had higher density andbiomass in the logged section than in the forestedsection and in the pre-removal period. Scrapers andfilterers become dominant after riparian removal,while shredders, predators and collectors did not showsignificant changes either between sites or periods.Responses of environmental variables and bioticcommunities indicate that the changes occurring in thestream due to riparian removal could be consideredbottom-up controlled, as increased illumination wasthe main mechanism responsible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009938511352
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