Type of Publication: | Journal article |
Publication status: | Published |
Author: | Richter, Doreen; Gross, Elisabeth M. |
Year of publication: | 2013 |
Published in: | Aquatic Sciences ; 75 (2013), 3. - pp. 457-467. - ISSN 1015-1621. - eISSN 1420-9055 |
DOI (citable link): | https://dx.doi.org/10.1007/s00027-013-0292-9 |
Summary: |
In the course of re-oligotrophication in Lower Lake Constance, Germany, the tall-growing angiosperm Myriophyllum spicatum has been almost replaced by dense and lower-growing charophytes. We hypothesise that Chara globularis negatively affects the performance of M. spicatum due to density competition and nutrient interference. Intra- and interspecific competition was assessed using a response surface experimental design with different densities of both species in mono and mixed stands in an outdoor mesocosm experiment. After 8 weeks, we measured the growth and various functional traits of both species, including stoichiometry, ash-free dry mass and dry-matter content, and for M. spicatum, additionally chlorophyll content, leaf-mass fraction, formation of autofragments, and root/shoot ratio. With increasing density, C. globularis reduced the growth of M. spicatum much more strongly than that of conspecifics. Increasing density of C. globularis led to a lower chlorophyll a to b ratio and lower nitrogen content based on ash-free dry mass in M. spicatum as well as reduced autofragmentation. Established C. globularis meadows can negatively affect tall-growing angiosperms such as M. spicatum when the environmental conditions, such as low phosphorus availability and high water-clarity, are appropriate. These findings have implications for the management of lakes, specifically those where a nuisance growth of tall macrophytes occurs, e.g. in systems where M. spicatum is invasive.
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Subject (DDC): | 570 Biosciences, Biology |
Keywords: | Competition, Ecological stoichiometry, Functional traits, Re-oligotrophication, Submerged macrophytes |
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RICHTER, Doreen, Elisabeth M. GROSS, 2013. Chara can outcompete Myriophyllum under low phosphorus supply. In: Aquatic Sciences. 75(3), pp. 457-467. ISSN 1015-1621. eISSN 1420-9055. Available under: doi: 10.1007/s00027-013-0292-9
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