Phragmites australis makes valuable floating mat biotopes under oligotrophic conditions

Hong, Mun Gi; Nam, Bo Eun; Kim, Jae Geun

doi:10.1007/s11355-020-00440-9

Cited by 1 publication

(2 citation statements)

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“…Accordingly, the health and integrity of the lake ecosystem can be strongly impacted by any significant water level change [2,3]. In lakes, water level rise is a very common stressor on the growth and reproduction of aquatic plants, and the stress is characterized by its rate, duration, frequency, amplitude and timing [3][4][5]. Macrophytes usually develop physiological and morphological adaptations to flooding [2,6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, floating mats can also provide a safe habitat for vulnerable and endangered plant species [15,16]. Although emergent mat formation is a global geographical phenomenon [17], only some common emergent macrophytes, such as Phragmites, Zizania, Typha, Scirpus, Carex, Cladium, Cyperus and Vossia, can develop floating mats [5,15,18]. Therefore, we can speculate that a species that can form floating mats more easily would have a superior competitive advantage over others and could dominate the emergent community under conditions of a substantial water level rise.…”

Section: Introductionmentioning

confidence: 99%

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Floating Mat Formation Makes Zizania latifolia More Competitive under the Conditions of Continuous Significant Water Level Rise

Wen

Xiao

et al. 2023

Plants

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Water level rise is considered an environmental filter for the growth and reproduction of aquatic plants in lakes. Some emergent macrophytes can form floating mats, enabling them to escape from the negative effects of deep water. However, an understanding of which species can be uprooted and form floating mats easily and what factors affect these tendencies remains greatly elusive. We conducted an experiment to determine whether the monodominance of Zizania latifolia in the emergent vegetation community in Lake Erhai was related to its floating mat formation ability and to try to find the reasons for its floating mat formation ability during the continuous increase in water level over the past few decades. Our results showed that both the frequency and biomass proportion of Z. latifolia were greater among the plants on the floating mats. Furthermore, Z. latifolia was more likely to be uprooted than the other three previously dominant emergent species due to its smaller angle between the plant and the horizontal plane, rather than the root:shoot or volume:mass ratios. The dominance of Z. latifolia in the emergent community in Lake Erhai is due to its easier ability to become uprooted, allowing it to outperform other emergent species and become the single dominant emergent species under the environmental filter of deep water. The ability to uproot and form floating mats may be a competitive survival strategy for emergent species under the conditions of continuous significant water level rise.

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