Competition between Chara aspera and Potamogeton pectinatus as a function of temperature and light

Berg, M.S. van den; Coops, H.; Simons, J.; Keizer, Annemarie de

doi:10.1016/s0304-3770(97)00099-5

Cited by 73 publications

(34 citation statements)

References 22 publications

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“…Looking into the mechanistic details of competition, it appears that there is an interesting asymmetry much like the one discussed for floating plants versus submerged plants. In the case of pondweeds and Chara, the tall, canopyforming pondweed (P. pectinatus) is simply on top of the short charophyte (C. aspera), and therefore pondweed is the better competitors for light (Van den Berg et al, 1998a). However, it appears that the stonewort is strongly depleting bicarbonate, and can at the same time survive at lower bicarbonate concentrations (Van den Berg, 1999).…”

Section: Charophyte Dominancementioning

confidence: 99%

Shallow lakes theory revisited: various alternative regimes driven by climate, nutrients, depth and lake size

2007

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Shallow lakes have become the archetypical example of ecosystems with alternative stable states. However, since the early conception of that theory, the image of ecosystem stability has been elaborated for shallow lakes far beyond the simple original model. After discussing how spatial heterogeneity and fluctuation of environmental conditions may affect the stability of lakes, we review work demonstrating that the critical nutrient level for lakes to become turbid is higher for smaller lakes, and seems likely to be affected by climatic change too. We then show how the image of just two contrasting states has been elaborated.

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Section: Charophyte Dominancementioning

confidence: 99%

Shallow lakes theory revisited: various alternative regimes driven by climate, nutrients, depth and lake size

2007

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“…The decrease in the numbers of ciliates in the Chara habitat might result from the fact that the release of allelopathic substances has been shown to reduce the growth of algae (BLINDOW, 1991). According to VAN DEN BERG et al, (1998) Chara may reduce the algae biomass by taking up nutrients from the water.…”

Section: Relationships With Environmental Factorsmentioning

confidence: 99%

Influence of Emergent and Submerged Macrophytes on the Structure of Planktonic Ciliate Communities in Shallow Freshwater Lakes (Eastern Poland)

Mieczan

2008

International Review of Hydrobiology

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Data from two shallow macrophyte-dominated lakes (Eastern Poland) sampled with standardized methods, were evaluated in order to examine the effects of various stands of macrophytes in predicting protozooplankton community structure. Differences in macrophyte structure led to two distinct groups of habitats having different patterns of ciliate distribution. The first group consists of two vegetated habitats of sparse stem density and of the open water zone, and the second of submerged macrophyte species, which were more dense and complex. The number of significant correlations was different in the studied habitats. In central zones of macrophyte habitats the number of ciliates had the strongest correlation with concentrations of total organic carbon and P tot . On the other side in the border zone a significant correlation between the number of ciliates and the chlorophyll a concentration was found. IntroductionAlternate stable theory typically deals with shallow moderately productive to productive lakes. The two major groups of primary producers are macrophytes and phytoplankton (PECKHAM et al., 2006). Ecological theory proposed that shallow lakes appear in two major alternate stable states -one dominated by aquatic macrophytes and the other by phytoplankton. The crux of the alternate stable state theory is that within an intermediate range of nutrient loading, characteristic of moderately eutrophic and eutrophic lakes, primary productivity can by dominated by either littoral macrophyte or pelagic phytoplankton communities (SCHEFFER et al., 1993;PECKHAM et al., 2006). Littoral habitats with emergent and submerged macrophytes serve as important sinks for nutrients that enter the lake and as major regulators of nutrient dynamics in lake ecosystems through habitat coupling (WET-ZEL, 2001;SCHINDLER and SCHEUERELL, 2002). When water is clear because of macrophyte dominance, nutrients are tied up in macrophytes, slowing algal growth. Littoral zones in shallow lakes constitute a mosaic of vertical and horizontal microhabitats provided by emergent and submerged macrophytes and open patches. The structure, as well as the trophic interactions of macrophyte-associated littoral food webs is inherently complex. High habitat structural complexity increases the spatial separation of refuges, thus limiting populations, influencing consumer-resource dynamics and weakening the strength of trophic cascades through efficiency of predators (SHURIN et al., 2002). Dense macrophyte beds can act as a refuge for large zooplankton species, which in turn control the phytoplankton and this www.revhydro.com may affect also the structure and function of the microbial community (SCHRIVER et al., 1995;JÜRGENS and JEPPESEN, 1997). The partitioning of zooplankton communities within vegetation in macrophyte-dominated lakes is well known for some invertebrate species and fish (DOWNING and CYR, 1986;KAIRESALO et al., 2000; NURMINEN and HORPPILA, 2002;KUCZYŃSKA-KIPPEN, 2005). Protozoa represent a main component of zooplankton and play a signif...

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“…They reproduce by fragmentation or sexually by the production of overwintering zygotes or oospores, which can be dormant when released from the parent plant (SEDERIAS and COLMAN, 2007). Chara aspera DETHARDING ex WILLDENOW is able to survive in clear water due to efficient use of light (VAN DEN BERG et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Increased Temperature Due to Global Warming Alters the Respiratory Potential in Aquatic Organisms from an Oligotrophic Lake

Simčić

Germ

2010

International Review of Hydrobiology

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The influence of elevated temperature was studied on the respiratory potential of a microplankton community, two macrophytes species (Myriophyllum spicatum and Chara aspera), and sediments, all from an oligotrophic lake, in order to estimate their susceptibility to temperature change. Samples collected in winter, spring, summer and autumn were incubated at three different temperatures. The respiratory potential, measured as electron transport system (ETS) activity at a standard temperature of 20 °C was, in average, greater at higher incubation temperatures for 117% in microplankton and for 30% in sediments, indicating that elevated temperature influenced the respiratory capacity of the microbial communities for mineralization of organic matter through respiration. The large increases of respiratory potential in winter microplankton community (for 184% at the highest incubation temperature compared to the temperatures of the multiyear period) and spring microplankton community (190%), and in spring sediment (64%) reveal that those communities are most susceptible to elevated temperatures during the coldest period of a year and at the beginning of lake warming. The respiratory activity of Myriophyllum spicatum was independent of incubation temperature, indicating its wide physiological tolerance. The lower respiratory potential at higher temperatures in Chara aspera optimized the use of energy in plants.

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Competition between Chara aspera and Potamogeton pectinatus as a function of temperature and light

Cited by 73 publications

References 22 publications

Shallow lakes theory revisited: various alternative regimes driven by climate, nutrients, depth and lake size

Shallow lakes theory revisited: various alternative regimes driven by climate, nutrients, depth and lake size

Influence of Emergent and Submerged Macrophytes on the Structure of Planktonic Ciliate Communities in Shallow Freshwater Lakes (Eastern Poland)

Increased Temperature Due to Global Warming Alters the Respiratory Potential in Aquatic Organisms from an Oligotrophic Lake

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