Temporal and spatial changes in population structure of the freshwater macroalga <i>Nitellopsis obtusa</i> (Desv.) J.Groves

Boissezon, Aurélie; Joye, Dominique; Garcia, Thiago Deruza

doi:10.1080/23818107.2017.1356239

Cited by 16 publications

(8 citation statements)

References 24 publications

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“…In contrast, in the North America, in its non-native range, N. obtusa is of increasing concern as an invasive species with rapid spread and high ability to form large, nearly monotypic stands resistant to control (Larkin et al, 2018). This may result from the high adaptative abilities of N. obtuse suggested by Boissezon et al (2018).…”

Section: Discussionmentioning

confidence: 99%

Charophyte variation in sensitivity to eutrophication affects their potential for the trophic and ecological status indication

Kolada

2021

Knowl. Manag. Aquat. Ecosyst.

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Charophytes (stoneworts) form a group of macrophytes that are considered sensitive to eutrophication. The high indicator value of charophytes toward eutrophication results in their wide use in the bioassessment systems. I explored the variability of stonewort communities' requirements for trophic conditions in lowland temperate lakes and attempted to determine the role of individual syntaxa in assessing the ecological status of lakes in Poland. The position of charophyte communities' niches along the trophic gradient was analysed using the Outlying Mean Index approach. A few stonewort communities, i.e., Nitelletum opacae, N. mucronatae, N. flexilis and Charetum filiformis appeared to be specialised concerning water quality and may be considered indicators of habitats less eutrophic than the “mean” trophic conditions in the study domain. Most stonewort communities were relatively common in European waters. Four of them, i.e., Charetum tomentosae, C. asperae, C. contrariae and Nitellopsidetum obtusae, can be classified as ‘generalists’ with low marginality and broad ecological tolerance. Most stonewort communities appeared in a broad range of ecological status classes. In the case of 15 communities, 6 to 25% of occurrences were observed in lakes representing a less than good status, and they cannot be considered indicative of good ecological conditions. However, the high taxonomic diversity and extensive phytolittoral zone were most likely to occur when the phytocoenoses of stoneworts were present. In lowland naturally eutrophic lakes inhabited by eurytopic species, the extraordinary role of charophytes in the assessment of the ecological status can be interpreted through their significant contribution to the development of the littoral.

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Section: Discussionmentioning

confidence: 99%

Charophyte variation in sensitivity to eutrophication affects their potential for the trophic and ecological status indication

Kolada

2021

Knowl. Manag. Aquat. Ecosyst.

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“…A comparison of the number of species co-occurring with N. obtusa in Europe and North America allows for the following summary based on our own study and the available literature data (Dąmbska, 1964;Schloesser et al, 1986;Bailly & Schaefer, 2010;Styperek et al, 2014;Urbaniak & Gąbka, 2014;Midwood et al, 2016;Alix et al, 2017;Brainard & Schulz, 2017;Boissezon et al, 2017;Larkin et al, 2018). The total number of aquatic plants co-occurring with N. obtusa in Europe reaches 27, including 11 charophyte species and 16 non-charophyte macrophytes.…”

Section: Discussionmentioning

confidence: 90%

“…Nitellopsis obtusa is widely distributed in Europe and Asia. In Europe, the species has been recorded from Table 3 Species most frequently co-occurring with Nitellopsis obtusa, based on literature sources: (Dąmbska, 1964;Schloesser et al, 1986;Bailly & Schaefer, 2010;Urbaniak & Gąbka, 2014;Styperek et al, 2014;Midwood et al, 2016;Alix et al, 2017;Brainard & Schulz, 2017;Boissezon et al, 2017;Larkin et al, 2018;this (Urbaniak, 2003;Kabus, 2016;Vesić, 2016;Romanov et al, 2018). In Asia, N. obtusa is known from Turkestan, India, Myanmar, China and Japan (Ling et al, 2000;Urbaniak, 2003;Kato et al, 2005Kato et al, , 2014.…”

Section: Worldwide Distribution Versus Propagation Mode Of N Obtusamentioning

confidence: 99%

Impact of Nitellopsis obtusa (Desv.) J. Groves, a regionally alien and invasive charophyte, on macrophyte diversity in the species native range

et al. 2021

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This study aimed to determine the relationships between the abundance of Nitellopsis obtusa, a controversial charophyte, locally red-listed in its native Eurasian range but invasive in North America, and the species diversity of macrophyte stands dominated by N. obtusa. Three lakes of different morphology, productivity and catchment were surveyed in the species native range. In each lake, the species composition and cover of three N. obtusa-dominated stands were determined monthly from spring to autumn and illustrated by the Shannon–Wiener diversity index. Water chemistry supplemented vegetation study. The species diversity turned out to be lake-specific and declined with the increasing share of N. obtusa, which developed mass occurrence in less mineralised and less fertile waters, leaving no space and limiting light and nutrient availability for large and branchy macrophytes. We postulate that this mechanism makes N. obtusa a superior competitor in less fertile waters and seems common to both native and invaded territories, as is the pool of macrophyte species most frequently co-occurring with N. obtusa.

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“…Nitellopsis obtusa is native to deep lakes of Europe and Asia, but recently has been colonizing more polluted and shallow water habitats and became invasive in the Great Lakes of North America (Beilby and Casanova, 2014; Boissezon et al, 2018). It can survive in slightly brackish conditions (50–100 mM NaCl, Winter et al, 1999).…”

Section: Discussionmentioning

confidence: 99%

Modeling the Action Potential in Characeae Nitellopsis obtusa: Effect of Saline Stress

et al. 2019

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Action potentials (AP) of characean cells were the first electrical transients identified in plants. APs provide information about plethora of environmental cues. Salinity stress is critical for plants and impacts on excitability. The AP of brackish Characeae Nitellopsis obtusa , obtained in artificial pond water (APW) and under osmotic stress of 90 or 180 mM sorbitol APW or saline stress of 50 or 100 mM NaCl APW, were simulated by the Thiel-Beilby model (Beilby and Al Khazaaly, 2016 ). The model is based on a paradigm from animal systems, featuring the second messenger inositol 1,4,5-triphosphate (IP 3 ) mediating the opening of Ca 2+ channels on internal stores. In plants the IP 3 receptors have not been identified, so other second messengers might translate the threshold plasma membrane depolarization to Ca 2+ release. The increased Ca 2+ concentration in the cytoplasm activates Cl − channels, which lead to the depolarizing phase of the AP. The repolarization to normal resting potential difference (PD) results from the Ca 2+ being re-sequestered by the Ca 2+ pumps, the closure of the Cl − channels, efflux of K + through the depolarization-activated outward rectifier channels and the continuing activity of the proton pump. The Nitellopsis AP form is longer in APW compared to that of Chara , with more gradual repolarization. The tonoplast component of the AP is larger than that in Chara australis . The plasma membrane AP is prolonged by the exposure to saline to a “rectangular” shape, similar to that in Chara . However, the changes are more gradual, allowing more insight into the mechanism of the process. It is possible that the cells recover the original AP form after prolonged exposure to brackish conditions. Some cells experience tonoplast APs only. As in Chara , the proton pump is transiently inhibited by the high cytoplasmic Ca 2+ and gradually declines in saline media. However, if the cells are very hyperpolarized at the start of the experiment, the pump inhibition both by the AP and by the saline medium is mitigated. The model parameters and their changes with salinity are comparable to those in Chara .

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Temporal and spatial changes in population structure of the freshwater macroalga Nitellopsis obtusa (Desv.) J.Groves

Cited by 16 publications

References 24 publications

Charophyte variation in sensitivity to eutrophication affects their potential for the trophic and ecological status indication

Charophyte variation in sensitivity to eutrophication affects their potential for the trophic and ecological status indication

Impact of Nitellopsis obtusa (Desv.) J. Groves, a regionally alien and invasive charophyte, on macrophyte diversity in the species native range

Modeling the Action Potential in Characeae Nitellopsis obtusa: Effect of Saline Stress

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