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Greater Annual Macrophyte Abundance in Warmer Locations in Consequence of Nutrients in Lakes V205a Page 2 the Longer Plant Growing-Season

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Greater Annual Macrophyte Abundance in Warmer Locations in Consequence of Nutrients in Lakes V205a Page 2 the Longer Plant Growing-Season Nutrients in Lakes V205a Page 1 Reference Type: Journal Article Record Number: 482 Author: Moss, B.; Stephen, D.; Balayla, D. M.; Becares, E.; Collings, S. E.; Fernandez-Alaez, C.; Fernandez-Alaez, M.; Ferriol, C.; Garcia, P.; Goma, J.; Gyllstroem, M.; Hansson, L. A.; Hietala, J.; Kairesalo, T.; Miracle, M. R.; Romo, S.; Rueda, J.; Russell, V.; Stahl-Delbanco, A.; Svensson, M.; Vakkilainen, K.; Valentin, M.; Van De Bund, W. J.; Van Donk, E.; Vicente, E.; Villena, M. J. Year: 2004 Title: Continental-scale patterns of nutrient and fish effects on shallow lakes: Synthesis of a pan-european mesocosm experiment Journal: Freshwater Biology Volume: 49 Issue: 12 Pages: 1633-1649 Accession Number: AN 2005:18924 Abstract: 1. Results are analyzed from 11 expts. in which effects of fish addn. and nutrient loading on shallow lakes were studied in mesocosms. The expts., five in 1998, six in 1999, were carried out in six lakes, distributed from Finland to southern Spain, according to a std. protocol. 2. Effects of the treatments on 29 std. chem., phytoplankton and zooplankton variables are examd. to assess the relative importance of bottom-up (nutrient enrichment) and top-down (fish predation) effects. For each year, the expts. in different locations are treated as replicates in a meta-anal. Results of individual expts. are then compared in terms of the patterns of significant influences of nutrient addn. and fish predation with these overall results (the baseline), and between years in the same location. 3. The overall meta-anal. gave consistent results across the 2 years, with nutrient loading influencing all of the chem. variables, and on av. 31% of primary producer and 39% of zooplankton variables. In contrast, fish influenced none of the chem. variables, 11% of the primary producer and 44% of the zooplankton variables. Nutrient effects on the system were thus about three times greater than fish effects, although fish effects were not inconsiderable. 4. The relative importance of nutrients and fish in individual expts. often differed between years at the same location and effects deviated to varying degrees from the baseline. These deviations were treated as measures of consistency (predictability) of conclusions in repeat expts. Consistency increased southwards and this is interpreted as a consequence of more variable annual weather northwards. 5. The influence of nutrient loading was greater southwards and this was probably manifested through naturally greater annual macrophyte abundance in warmer locations in consequence of Nutrients in Lakes V205a Page 2 the longer plant growing-season. There was no trend in the relative importance of fish effects with latitude but this may partly be an artifact of the simple fish. Community used. These findings suggest that nutrient control should be a greater priority than biomanipulation in the restoration of eutrophicated shallow lakes in warm temperate regions. 6. Starting conditions affected the outcome of expts. High initial concns. of total phosphorus and planktonic chlorophyll a concn. (created by local conditions prior to the expt.) led to de-emphasis of the importance of nutrient loading in the expt. [on SciFinder (R)] Notes: 61 Water School of Biological Sciences,University of Liverpool,Liverpool,UK. Journal 0046-5070 written in English. Reference Type: Journal Article Record Number: 483 Author: Liu, Chun-guang; Qiu, Jin-quan; Wang, Wen; Zhuang, Yuan-yi Year: 2004 Title: Advances on theory of biomanipulation in control of eutrophicated lakes Journal: Nongye Huanjing Kexue Xuebao Volume: 23 Issue: 1 Pages: 198-201 Accession Number: AN 2004:278017 Keywords: Eutrophication (advances on theory of biomanipulation in control of eutrophication of lakes); Ecosystem (aquatic; advances on theory of biomanipulation in control of eutrophication of lakes); Remediation (bioremediation; advances on theory of biomanipulation in control of eutrophication of lakes); Lakes (eutrophic; advances on theory of biomanipulation in control of eutrophication of lakes) review biomanipulation eutrophic lake Abstract: A review. Advances of biomanipulation theory for control of eutrophic lakes were reviewed. Relations among fish, zooplankton, phytoplankton, submerged macrophyte, and bacteria in eutrophic aquatic ecosystem were analyzed. Effects and problems of applying this theory in the process of lake recovery were discussed. Some suggestions on the development of this theory were proposed. [on SciFinder (R)] Nutrients in Lakes V205a Page 3 Notes: CAN 141:128105 61-0 Water College of Environmental Science and Engineering,Nankai University,Tianjin,Peop. Rep. China. Journal; General Review 1672-2043 written in Chinese. Reference Type: Journal Article Record Number: 615 Author: Van Donk, E.; Santamaria, L.; Mooij, W. M. Year: 2003 Title: Climate warming causes regime shifts in lake food webs: A reassessment Journal: Limnology and Oceanography Volume: 48 Issue: 3 Pages: 1350-1353 Alternate Journal: Limnol.Oceanogr. Label: 5 Keywords: Global warming Food webs Water temperature Lakes Turbidity Climatic changes Temperature effects Correlation analysis Water transparency Restoration Bioremediation Freshwater fish Zooplankton Phytoplankton Pisces Algae Netherlands AN, North Atlantic, North Atlantic Oscillation Nutrients in Lakes V205a Page 4 North Atlantic oscillation Freshwater Abstract: In a recent paper in Limnology and Oceanography (46: 1780-1783) by Scheffer et al. (2001), it is stated that "the probability of clear water phases increases with the temperature of lake water." This conclusion is put within the framework of climate change as measured by the North Atlantic oscillation (NAO) and is based on an empirical analysis of 257 seasonal chlorophyll a patterns collected in 71 shallow Dutch lakes. To check whether an enhanced probability of clear water phases can indeed be caused by a change in water temperature, simulations were performed with a minimodel of algae- zooplankton-fish interactions under control of seasonal variations in temperature (Scheffer et al. 1997). In this Comment, we want to reexamine the conclusion that the probability of clear water phases increases with temperature. We base our analysis on the same empirical data and the same model as used by Scheffer et al. (2001). The motivation for our reinterpretation of the empirical data is that Scheffer et al. (2001) did not refer to the extensive lake restoration efforts (biomanipulation through fish removal and nutrient reduction) that took place since the late 1980s in many shallow Dutch lakes (Hosper 1997, 1998; Van Donk 1998; Lammens 1999; Meijer et al. 1999). These efforts were specifically aimed at improving water transparency, and they were in many cases successful, including in several of the lakes covered by the data set used by Scheffer et al. (2001). The period during which lake restoration enhanced clear water phases coincides with the period of high NAO-index values and high water temperatures. Lake restoration should therefore be considered as an alternative explanation for the observed correlation between the NAO index and the probability of clear water phases. Notes: TY - JOUR Y2 - May TR: CS0418489 M1 - Journal Author Address: Netherlands Institute of Ecology, Centre for Limnology, Rijksstraatweg 6, 3631 AC Nieuwersluis, The Netherlands Reference Type: Journal Article Record Number: 484 Author: Sondergaard, Martin; Jensen, Jens Peder; Jeppesen, Erik Year: 2003 Title: Role of sediment and internal loading of phosphorus in shallow lakes Journal: Hydrobiologia Nutrients in Lakes V205a Page 5 Volume: 506-509 Pages: 135-145 Accession Number: AN 2004:40216 Keywords: Remediation; Water pollution (lake; phosphorus-contg. sediment and internal loading of phosphorus in shallow lakes); Lake sediments; Lake waters (phosphorus-contg. sediment and internal loading of phosphorus in shallow lakes); Lakes (restoration of; phosphorus-contg. sediment and internal loading of phosphorus in shallow lakes); Environmental pollution (sediment, lake; phosphorus-contg. sediment and internal loading of phosphorus in shallow lakes) review sediment role internal loading phosphorus shallow lake Abstract: A review. The sediment plays an important role in the overall nutrient dynamics of shallow lakes. In lakes where the external loading has been reduced, internal phosphorus loading may prevent improvements in lake water quality. At high internal loading, summer concns. in particular rise and phosphorus retention can be neg. during most of the summer. Internal P loading originates from a pool accumulated in the sediment at high external loading, and significant amts. of phosphorus in lake sediments may be bound to redox- sensitive iron compds. or fixed in more or less labile org. forms. These forms are potentially mobile and may eventually be released to the lake water. Many factors are involved in the release of phosphorus. In particular, the redox- sensitive mobilization from the anoxic zone a few millimeters or centimeters below the sediment surface and microbial processes are considered important, but the phosphorus release mechanisms are to a certain extent lake specific. The importance of internal phosphorus loading is highly influenced by the biol. structure in the pelagic zone, and lakes shifting from a turbid to a clear water state as a result of, for example, biomanipulation may have considerably improved retention. However, internal loading may increase again if the turbid state returns. The recovery period following a phosphorus loading redn. depends
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