Strategy analysis of submerged lake macrophyte communities: an international example

Murphy, K. J.; Rørslett, Bjørn; Springuel, Irina

doi:10.1016/0304-3770(90)90048-p

Cited by 106 publications

(37 citation statements)

References 32 publications

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“…The importance of this gradient has been stressed by various authors discussing macrophyte strategies (Van Wijk 1988;Day et al 1988;Kautsky 1987Kautsky , 1988van Vierssen 1989;Murphy et al 1990;Wiegleb & Brux 1991). The species' performance along the productivity gradient remains largely untouched, which shows the high degree of independence of the two axes.…”

Section: Discussionmentioning

confidence: 99%

Human impact on the ecological performance of Potamogeton species in northwestern Germany

Wiegleb

Brux²,

Herr³

1991

Vegetatio

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The changes in habitat quality of lowland rivers in Lower Saxony (Germany) during the past 40 years are outlined. Almost all chemical, physical, and morphological parameters have changed, resulting in most cases in an enhanced potential productivity, accompanied by a complex disturbance regime. Historical reconstruction of the change in river vegetation is presented to compare the frequency of macrophyte species 40 years ago with the situation of today. For a total of 289 sampling sites, the floristic change was exactly reconstructed. Nearly all species show a decline in frequency. This trend is also recognizable in Potamogeton, with the exception of two narrow-leaved species.An attempt is made to explain both decline and maintenance in terms of life history characters (vital attributes) allowing the species to react to the changing habitat conditions. The successful species are characterized by certain life history characteristics which enable them to survive under the current disturbance regime. Most important aspects of life history are the ability to reproduce by means ofturions and other fragments, a long-lived, deep-rooting rhizome system, phenotypic plasticity of above-ground parts, synchronous shoot polymorphism, and the potential to regenerate quickly from remaining buds after disturbance. The decline of formerly frequent species can be attributed mainly to the lack of certain key characters; however, physiological characters also may be important. The extirpation of some rare species could also be caused by random fluctuations in small populations. The general importance of population ecological research, particularly demography, life history theory, and the modelling of clonal populations in conservation ecology is stressed.

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Section: Discussionmentioning

confidence: 99%

Human impact on the ecological performance of Potamogeton species in northwestern Germany

Wiegleb

Brux²,

Herr³

1991

Vegetatio

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“…If sediment nutrients were highly available, a greater production of shoot biomass (to capture more light resources) was expected ('competitive strategy, ' Kautsky 1988, Murphy et al 1990, Grime 2001. In contrast, under low-nutrient conditions, shoot development was constrained because a greater proportion of the biomass was allocated to the root system to increase nu trient acquisition (Xie et al 2007, Wang et al 2009).…”

Section: Auto-fragment Productionmentioning

confidence: 99%

Growth response of the submerged macrophyte Myriophyllum spicatum to sediment nutrient levels and water-level fluctuations

Cao¹,

Wang²,

ZunLing³

2012

Aquat. Biol.

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Sediment nutrient levels and water-level fluctuations are important factors that affect the development and growth of submerged macrophytes; however, little is known about the adaptive responses of macrophytes to these factors. We conducted an experiment using the submerged macrophyte Myriophyllum spicatum L. grown under 2 sediment nutrient levels (high: 2.7 mg g −1 total nitrogen, TN; 1.5 mg g −1 total phosphorus, TP; low: 1.45 mg g −1 TN and 0.70 mg g −1 TP) and 3 amplitudes of water-level fluctuation (static, ± 50 cm, ±100 cm) in outdoor ponds. We hypothesized that increased nutrient supply would promote the growth of M. spicatum, which can acclimate to the negative effects of moderate water-level fluctuations. After 112 d of growth under high-nutrient conditions, the plants produced a greater shoot biomass (higher branch number and length), resulting in greater accumulation of total biomass. However, plant growth was inhibited by increasing the amplitude of the water-level fluctuations: at ±100 cm, the plants allocated more biomass to the roots and produced fewer and longer branches. Conversely, plant growth was promoted in the high-nutrient sediments at ± 50 cm amplitude. The production of auto-fragments was increased in the high-nutrient sediment but was significantly decreased by high water-level fluctuations. Thus, sediment nutrient levels and water-level fluctuations have strong interactive effects on the growth and reproduction of M. spicatum, and increased sediment nutrients in combination with moderate water level fluctuations facilitate nutrient acquisition, plant growth, and reproduction. Our study implies that moderate water-level fluctuations benefit the restoration of submerged macrophyte communities, particularly in high-nutrient habitats.

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“…Other approaches focus only on selected groups of macrophytes, such as isoetids (e.g. Murphy et al 1990).…”

Section: Introductionmentioning

confidence: 99%

Classifying aquatic macrophytes as indicators of eutrophication in European lakes

Penning

Mjelde

Dudley³

et al. 2008

Aquat Ecol

146

115

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Aquatic macrophytes are one of the biological quality elements in the Water Framework Directive (WFD) for which status assessments must be defined. We tested two methods to classify macrophyte species and their response to eutrophication pressure: one based on percentiles of occurrence along a phosphorous gradient and another based on trophic ranking of species using Canonical Correspondence Analyses in the ranking procedure. The methods were tested at Europe-wide, regional and national scale as well as by alkalinity category, using 1,147 lakes from 12 European states. The grouping of species as sensitive, tolerant or indifferent to eutrophication was evaluated for some taxa, such as the sensitive Chara spp. and the large isoetids, by analysing the (nonlinear) response curve along a phosphorous gradient. These thresholds revealed in these response curves can be used to set boundaries among different ecological status classes. In total 48 taxa out of 114 taxa were classified identically regardless of dataset or classification method. These taxa can be considered the most consistent and reliable indicators of sensitivity or tolerance to eutrophication at European scale. Although the general response of well known indicator species seems to hold, there are many species that were evaluated differently according to the database A. Kolada selection and classification methods. This hampers a Europe-wide comparison of classified species lists as used for the status assessment within the WFD implementation process.

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Strategy analysis of submerged lake macrophyte communities: an international example

Cited by 106 publications

References 32 publications

Human impact on the ecological performance of Potamogeton species in northwestern Germany

Human impact on the ecological performance of Potamogeton species in northwestern Germany

Growth response of the submerged macrophyte Myriophyllum spicatum to sediment nutrient levels and water-level fluctuations

Classifying aquatic macrophytes as indicators of eutrophication in European lakes

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