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Holz, John C.; Hoagland, Kyle D.; Spawn, Rebecca L.; Popp, Arthur; Andersen, John L.

doi:10.1023/a:1002978302479

Cited by 38 publications

(14 citation statements)

References 26 publications

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“…Another process that may be occurring at the same time, and which would explain the negative relationship of warming with phytoplankton biomass, is the gradual disappearance of the effects of the internal nutrient dynamics in a newly-formed lake. This process, which that usually occurs over years in recently-built freshwater ecosystems such as reservoirs 23,33 , reduces the amount and variability of TB as we have observed (Fig. 1).…”

Section: Discussionsupporting

confidence: 57%

Long-Term Phytoplankton Dynamics in a Complex Temporal Realm

Álvarez‐Cobelas

Rojo

Benavent-Corai

2019

Sci Rep

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Faced with an environment of accelerated change, the long-term dynamics of biotic communities can be approached to build a consistent and causal picture of the communities’ life. We have undertaken a 25-year monthly-sampling study on the phytoplankton of a meso-oligotrophic lake, paying attention to controlling factors of overall biomass (TB) and taxonomical group biomass (TGBs). Long-term series included decreased trends of TB and TGBs, and multi-scale periodicity. A decadal TB periodicity emerged related to nitrogen concentration and Cryptophytes. Annual periodicities were mainly related to air and water temperature controlling the abundance of Chlorophytes or Dinoflagellates. Intra-annual cycles could arise from autogenic processes. The analysis by periods revealed relevant dynamics (for example, Diatom periodicities), hidden in the analysis of the complete series. These results allow us to establish that: i) two organizational levels of phytoplankton change differently in time scales from months to decades; ii) controlling factors (climate, water physics and chemistry) act at different time scales and on different TGBs, and iii) different combinations of the “taxonomical group-control factor-trend and periodicity” set throughout the studied time explain total biomass dynamics. A holistic approach (multiple complementary analyses) is necessary to disentangle the different actors and relationships that explain non-stationary long-term phytoplankton dynamics.

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Section: Discussionsupporting

confidence: 57%

Long-Term Phytoplankton Dynamics in a Complex Temporal Realm

Álvarez‐Cobelas

Rojo

Benavent-Corai

2019

Sci Rep

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“…[33]. Furthermore, the drop in chlorophyll-a concentrations in this study during winter were mainly due to the lower phytoplankton biomass [34].…”

Section: Resultsmentioning

confidence: 75%

Phytoplankton primary production in southern Iraqi marshes after restoration

Journal¹

2011

Baghdad Sci.J

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Primary productivity and chlorophyll-a were used in this study to monitor the restoration process of southern Iraqi marshes (Al-Hewaizeh, central marshes, and Al-Hammar). The phytoplankton primary productivity was based on oxygen light/dark bottle method. Two different depths samples were taken monthly from six studied marshes stations (two stations for each marsh) during November 2005 to October 2006, while chlorophyll-a samples taken from surface water. The phytoplankton primary productivity values ranged 9.38 – 249.79 mg C/m3.hr for all marshes, its values for surface water sample ranged 11.71 – 256.24 mg C/m3.hr, while for 1m depth ranged 9.38 – 142.5 mg C/m3.hr. Chlorophyll-a values ranged between (1.1 – 21.26) µg/l indicating high values of productivity in the studied marshes comparing with other aquatic Iraqi ecosystems. Also, dissolved oxygen and oxygen saturation rate were measured in this study.

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“…Usually Trachelomonas, Euglena, Phacus, Lepocinclis and Monomorphina occurred in high numbers (eg. Safonova 1987, Holz et al 1997, Dasí et al 1997, Wołowski 1998, Naselli-Flores 2000, Paczuska et al 2002.…”

Section: Discussionmentioning

confidence: 99%

“…Holz et al (1997) showed that the mean summer relative abundances of euglenophytes in the eutrophic Pawnee Reservoir (USA) was 4% of the phytoplankton abundances. For hard-water Spanish reservoirs, Dasí et al (1998) described the maximum percentage of biomass of most representative summer euglenophyes (Trachelomonas sp., Euglena sp., Phacus longicauda) as 1-20%.…”

Section: Discussionmentioning

confidence: 99%

“…In spite of their potential use as indicators of environmental conditions, little is known about euglenophyta communities in large water bodies such as lakes and reservoirs. Most reports provide only general information about the representatives of the group, including only lists of species or genera (Holz et al 1997, Naselli-Flores 2000. This is probably due to the view that Euglenophyta are not quantitatively important in large water bodies (Safonova 1987).…”

Section: Introductionmentioning

confidence: 99%

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