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dc.contributor.authorCuvin-Aralar, Maria Lourdes
dc.contributor.authorFocken, Ulfert
dc.contributor.authorBecker, Klaus
dc.contributor.authorAralar, Emiliano V.
dc.date.accessioned2014-05-08T08:30:02Z
dc.date.available2014-05-08T08:30:02Z
dc.date.issued2004
dc.identifier.citationCuvin-Aralar, M. L., Focken, U., Becker, K., & Aralar, E. V. (2004). Effects of low nitrogen-phosphorus ratios in the phytoplankton community in Laguna de Bay, a shallow eutrophic lake in the Philippines. Aquatic Ecology, 38(3), 387-401.en
dc.identifier.issn1386-2588
dc.identifier.urihttp://hdl.handle.net/10862/2011
dc.description.abstractThe effects of low nitrogen-phosphorus ratios on microalgae from a large eutrophic freshwater lake in the Philippines were investigated. Natural microalgal populations from Laguna de Bay, the largest lake in the Philippines, were cultured using three different nitrogen-phosphorus weight ratios (2N:1P; 6N:1P and 12N:1P) at two phosphorus concentrations (0.25 and 0.5 mg l<sup>–1</sup>) in each case. The growth and genera composition of the cultures under the different treatments were followed for a 12-week period. Community level responses were assessed based on species richness (s), Shannon-Wiener Index (H’), Simpson Index (λ) and Evenness (J’). Among the different microalgal groups, only the chlorophytes showed a significantly higher density in response to the 12N:1P treatment at the higher P concentration, indicating that the nutrient ratio had a significant interaction with the nutrient levels used in the experiments. The genera found in the different treatments were generally similar; however, the degree of dominance of some varied with treatment during the experiment. The succession of dominant genera also differed among the N:P treatments. The diatoms like Fragilaria, Aulacoseira (= Melosira) and Nitzschia dominated the lowest N:P. On the other hand, chlorophytes (Kirchneriella and Scenedesmus) dominated the highest N:P treatment, particularly from the second to the seventh week of the experiments with the diatoms becoming co-dominant only towards the eighth week until the end of the experimental. The 6N:1P treatment showed a mixed dominance between the diatoms and the chlorophyte genera. The various indices of diversity indicate significantly lower diversity only in the 12N:1P at 0.5 mg l<sup>–1</sup> P and not in 12N:1P at 0.25 mg l<sup>–1</sup> P.en
dc.description.sponsorshipThis study was part the doctoral dissertation of the senior author at Hohenheim University, Germany. Funds for the study was provided in part by the European Union STDIII Program as component of the project ‘Laguna de Bay, Philippines: An Ecosystem Approach for Sustainable Management’ under contract CT 94-0334. Additional funds were provided by SEAFDEC/AQD under project code FS-03-F97B. The Deutschen Akademischen Austauschdienstes DAAD supported the senior author’s stay in Germany. Mr F. Reyes assisted in the culture and field collection of the samples. Dr. SF Baldia assisted in the identification of the samples.en
dc.language.isoenen
dc.publisherSpringer Verlagen
dc.subjectAulacoseiraen
dc.subjectFragilariaen
dc.subjectKirchneriellaen
dc.subjectMelosiraen
dc.subjectNitzschiaen
dc.subjectScenedesmusen
dc.subjectPhilippines, Luzon I., Laguna de Bayen
dc.subjectNutrient ratiosen
dc.titleEffects of low nitrogen-phosphorus ratios in the phytoplankton community in Laguna de Bay, a shallow eutrophic lake in the Philippinesen
dc.typeArticleen
dc.citation.volume38
dc.citation.issue3
dc.citation.spage387
dc.citation.epage401
dc.citation.journalTitleAquatic Ecologyen
dc.subject.asfaคลอโรฟิลล์en
dc.subject.asfaCommunity compositionen
dc.subject.asfaeutrophic lakesen
dc.subject.asfafreshwater lakesen
dc.subject.asfaGenetic diversityen
dc.subject.asfaการเติบโตen
dc.subject.asfaไนโตรเจนen
dc.subject.asfaNutrients (mineral)en
dc.subject.asfaฟอสฟอรัสen
dc.subject.asfaแพลงก์ตอนพืชen
dc.subject.asfaความหลากหลายทางชีวภาพen
dc.subject.asfaชีววิทยาของน้ำen
dc.subject.asfaแพลงก์ตอนพืชen
dc.identifier.essn1573-5125
dc.identifier.doi10.1023/B:AECO.0000035174.35091.0b


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  • AQD [1133]
    These papers were contributed by AQD staff to various national and international journals

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