Beschreibung der Characeen-Arten Deutschlands

Becker, Ralf; Blindow, Irmgard; Doege, Angela; Franke, Thomas; Gregor, Thomas; Hamann, Ulrike; Jäger, Dietmar; Jorda, Christian; Kabus, Timm; Korsch, Heiko; Korte, Egbert; Kusber, Wolf‐Henning; Pätzold, Frank; Raabe, Uwe; Schubert, Hendrik; Teppke, Matthias; Weyer, Klaus van de; Wolff, Peter

doi:10.1007/978-3-662-47797-7_12

Cited by 10 publications

(15 citation statements)

References 53 publications

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“…In comparison to other authors, and especially to more recently published data on the morphological features of charophytes (Becker et al 2016), we have observed several differences in plant characters. The specimens of C. baltica presently growing in the Polish part of the Baltic Sea are in general of similar length as presented in Becker et al (2016) and no plants that reach 90 cm (i.e. C. baltica var. liliebladi) have been observed.…”

Section: Discussioncontrasting

confidence: 49%

“…An earlier name for the widely used name for C. polyacantha is C. aculeolata Kütz. (Becker et al 2016), however, in this case its taxonomic position is not clear. The synonymy is presented in Table 2.…”

Section: Methodsmentioning

confidence: 90%

“…C. baltica var. liliebladi) have been observed. In the case of C. hispida and C. rudis , oogonia, antheridia and oospores are in general of similar size, except for the length of oogonia measured in Polish C. hispida that can be shorter (minimum size 415 μm) than described in Becker et al (2016). These authors described oogonia of C. rudis with a minimum breadth of 600 μm (Becker et al 2016) whereas the Polish specimens were smaller (minimum breadth 415 µm).…”

Section: Discussionmentioning

confidence: 96%

“…The plants were collected manually or using a hook directly from the field. We collected mature specimens and determined according to the Krause (1997), Urbaniak and Gąbka (2014), Becker et al (2016) and van de Weyer (2016) determination keys.…”

Section: Methodsmentioning

confidence: 99%

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Taxonomic studies on the Chara section Hartmania in Poland based on morphological and molecular data

Urbaniak¹,

Kwiatkowski²

2019

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Charophytes are aquatic green macroalgae, which inhabit fresh and brackish water ecosystems. In this study, four species belonging to the genus Chara were examined to determine their taxonomic status. Morphological characteristics of the plant bodies as well as plastid psaB barcoding genes were applied to test the relations among Chara species. Plants were initially classified using morphological features into four species: C. baltica, C. hispida, C. polyacantha and C. rudis, and twelve quantitative characters were used in a principal component analysis and discriminant analysis to determine groupings among the species and to determine the morphological features that best separated the groups. In the component analysis and discriminant analysis, results showed that only C. polyacantha and partly C. baltica formed separate groups. The other species C. hispida and C. rudis were only partially distinguishable. All species from one molecular group, and no differentiation in the psaB variability between them has been found.

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Section: Discussioncontrasting

confidence: 49%

Section: Methodsmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

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Taxonomic studies on the Chara section Hartmania in Poland based on morphological and molecular data

Urbaniak¹,

Kwiatkowski²

2019

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“…The charophytes used in this study were obtained from natural sediment collected from Lausiger Teiche (Saxony-Anhalt, Germany) by H. Schubert in January 2022. This site is known to be prone in charophyte vegetation and the occurrence of C. braunii has previously been observed (Becker et al, 2016). Approximately 100 mL of natural sediment were transferred to 0.5 L beakers and covered with 400 mL filtered (55 µm gaze) habitat water.…”

Section: Sampling and Culture Conditions Of Chara Brauniimentioning

confidence: 99%

Photosynthetic response ofChara brauniitowards different bicarbonate concentrations

Heise¹,

Hagemann

Schubert³

2023

Preprint

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A variety of inorganic carbon acquisition modes have been proposed in Characean algae, however, the specific inorganic carbon uptake mechanism is unknown for the genus Chara. In the present study, we analyzed if C. braunii can efficiently use HCO3- as a carbon source for photosynthesis. For this purpose, C. braunii was exposed to different concentrations of NaHCO3- for different time scales. The photosynthetic electron transport through photosystem I (PSI) and II (PSII), the maximal electron transport rate (ETRmax), the efficiency of the electron transport rate (alpha, the initial slope of the ETR), and the light saturation point of photosynthesis (Ek) were evaluated. Additionally, pigment contents (chlorophyll a, chlorophyll b, and carotenoids) were determined. Bicarbonate addition positively affected ETRmax after direct HCO3- application of both PSII and PSI, but this effect decreased after 1 h and 24 h. Similar trends were seen for Ek, but no significant effect was observed for alpha. Pigment contents showed no significant changes in relation to different HCO3- concentrations. To evaluate if cyclic electron flow around PSI was involved in active HCO3- uptake, the ratio of PSI ETRmax/PSII ETRmax was calculated but did not show a distinctive trend. These results suggest that C. braunii can utilize NaHCO3- in short time periods as a carbon source but relies on other carbon acquisition mechanisms over prolonged time periods. These observations differentiate C. braunii from other examined Chara spp. and suggest a minor direct role of HCO3- as a carbon source for photosynthesis in this alga.

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Depth-distribution of lake benthic diatom assemblages in relation to light availability and substrate: implications for paleolimnological studies

et al. 2020

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We analyzed the depth distributions of benthic diatoms in two adjacent, but hydrologically distinct subalpine lakes (Lakes Soiernseen, S-Germany). Lake Unterer Soiernsee is affected by marked water-level fluctuations and is light-penetrated to the bottom most of the year, while Lake Oberer Soiernsee provides more stable conditions and an extended aphotic zone. Mixed samples of epiphytic, epilithic, epipsammic and epipelic periphyton were taken in one-meter depth steps by scuba divers. Most of the common benthic diatoms occurred in distinct depth-areas. RDA analyses showed that depth was strongly correlated with species distribution in both lakes. Depth-constrained cluster analyses indicated three distinct diatom community zones in each lake. A shallow littoral zone hosting mainly epiphytic and epilithic species and a deeper littoral zone with mainly epipsammic and epipelic taxa existed in both lakes. Additionally, a highly disturbed near-shore littoral zone with diatoms adapted to unstable conditions (aerophilic taxa, pioneer species) was found in Lake Unterer Soiernsee, and a deep-water pelagic zone with mainly planktonic taxa in Lake Oberer Soiernsee. Light availability, substrate, physical stressors and nutrient concentrations were linked closely with water depth. While light availability affected the ratio of benthic and planktonic diatoms, substrate type influenced benthic diatom assemblage structures. Diatoms occurring in surficial sediments of the aphotic zone represent an ideal cross-section of the recent diatom assemblage of the lake, including benthic and planktonic species. However, sediment samples taken in light-flooded depths are inappropriate for studies based on shifts between benthic and planktonic taxa, because in situ benthic species dominate the surface-sediment assemblages, while settled tychoplanktonic and planktonic species occur less frequently. A diatom-inferred depth model was created for each lake to prove the usability for down-core studies using weighted-averaging approaches. For both lakes these models are highly appropriate to reconstruct past fluctuations in water-transparency or lake-level. With regard to the development of diatom-based TP-transfer-functions for Bavarian mountain lakes, we found it is highly important to consider lake depth and transparency. Based on the findings of this study we recommend the creation of two different training-sets, one for deep or low-transparency lakes with an aphotic zone including both benthic and planktonic diatoms, and another one for shallow, clear water lakes solely using benthic diatoms.

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Beschreibung der Characeen-Arten Deutschlands

Cited by 10 publications

References 53 publications

Taxonomic studies on the Chara section Hartmania in Poland based on morphological and molecular data

Taxonomic studies on the Chara section Hartmania in Poland based on morphological and molecular data

Photosynthetic response ofChara brauniitowards different bicarbonate concentrations

Depth-distribution of lake benthic diatom assemblages in relation to light availability and substrate: implications for paleolimnological studies

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