Applied use of taxonomy: lessons learned from the first German intercalibration exercise for benthic diatoms

Dreßler, Mirko; Verweij, G.L.; Kistenich, Sonja; Kahlert, Maria; Werner, Petra

doi:10.1515/botcro-2015-0017

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…LM pictures were presented of identified taxa categorised as ambiguous (sp., aff., cf., s.l. ) to enable comparison of counting results among diatomists (Dreßler et al, 2015).…”

Section: Morphological Identificationmentioning

confidence: 99%

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Exploring diatom diversity through cultures - a case study from the Bow River, Canada

et al. 2022

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Diatom cultures can help answer taxonomic, biogeographic and ecological questions on a local and global scale. Unialgal cultures are derived from a single cell and provide abundant material for morphological and molecular analyses. The link between the historic morphological species concept and the molecular data is becoming increasingly important with the use of eDNA metabarcoding. Additionally, cultures provide insights into the life cycle of diatoms and thereby complement taxonomy and species ecology. In this study, we present an approach to extract benthic diatoms from an environmental sample to generate unialgal cultures. We explored diatom diversity in preserved assemblages and by culturing as many different taxa as possible from benthic freshwater samples taken on the same day from the Bow River in Calgary, Canada. With both methods we found a total of 221 different benthic diatom taxa, of which 182 were identified in the preserved diatom assemblages. Interestingly, an additional 39 taxa only appeared in the cultures. In total 129 strains were cultivated representing 71 different taxa. This study includes pictures of living cells demonstrating the additional merits of unialgal cultures, as they provide information on plastid details, auxospores and endosymbionts. Both, the identification of the diatom assemblages and the generation and identification of strains provide the foundation for additional water quality assessment tools, taxonomic insights and molecular references libraries.

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“…LM pictures were presented of identified taxa categorised as ambiguous (sp., aff., cf., s.l. ) to enable comparison of counting results among diatomists (Dreßler et al, 2015).…”

Section: Morphological Identificationmentioning

confidence: 99%

“…We were very strict with the identification, i.e., as soon as one feature of a taxon did not match the description in the identification literature to 100%, we labelled the species with a 'cf.'. Thus, we ensured that our counting results can be compared among diatomists (Dreßler et al, 2015).…”

Section: Cymbella Hantzschiana Krammer Xmentioning

confidence: 99%

Exploring diatom diversity through cultures - a case study from the Bow River, Canada

et al. 2022

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“…However, Stauroneis parathermicola could not be included in the calculation of the IPS index (and thus of the anthropic disturbance categories), since it has no indicator value attributed and there is only little information about its ecology (Stanektarkowska et al, 2013). Another source of uncertainty is represented by the nomenclature and classification of the species, since different name attributions lead to different results in quality indices calculations (Dreßler et al, 2015;Kahlert et al, 2016Kahlert et al, , 2012.…”

Section: Anthropic Disturbance Inferred From Terrestrial Diatomsmentioning

confidence: 99%

Tracing hydrological connectivity

Antonelli¹

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When investigating fundamental hydrological functions of catchments (i.e. collection, storage and release of water and matter), the spatial and temporal variability of hydrological connectivity is a key element (Black, 1997). Introduced in hydrology in the early 1980s by Burt & Gadiner (1982), the concept of hydrological connectivity has only recently attracted the attention of the scientific community. Over the past two decades, hydrological connectivity has become an important conceptual framework within which the spatial and temporal variability of streamflow generation and sediment transport can be conceptualised from a holistic perspective, considering the structural and functional connectivity between the Chapter structures and connectivity pathways (Cammeraat, 2002;Wohl et al., 2019). Failure in assessing these heterogeneities may lead to erroneous process conceptualisation and discrepancies between processes observed at smaller scales and responses that may occur at larger scales (Ward and Packman, 2019). Assessing system heterogeneities is also particularly important for restoration purposes (Ward and Packman, 2019;Wohl et al., 2019), since the management of systems' hydrological (and ecological) functions should account for this variability to be properly implemented.Recently, Wohl et al. (2019) and Blöschl et al. (2019) have highlighted the need to consider hydrological systems as borderless, in a way that the transition zones (or interfaces) between different landscape elements should be characterised for their own processes and fluxes to have a better perception of where and when connectivity may take place. Similarly, Krause et al. ( 2017) stressed the importance of system interfaces as "hot spots of ecological, biogeochemical and hydrological processes" arguing that an improved understanding of large-scale landscape interactions will only be possible once interface processes would be incorporated in system conceptualisation. Advancing hydrological connectivity understanding through interdisciplinary approachesWhen investigating hydrological systems connectivity, it is fundamental to consider the ecological and geomorphic components of the landscape and the way they interact with the hydrological components. In this sense, research on hydrological connectivity intrinsically requires a certain level of interdisciplinarity (i.e. incorporating knowledge and techniques from different disciplines) (Paton et al., 2019;Turnbull et al., 2018). During the last decade, several authors have emphasised the importance of interdisciplinary approaches -and of improving the dialogue between hydrologists and specialists of different disciplines -in order to further advance our understanding of hydrological connectivity (Cooper, 2010;Smith et al., 2019;Wainwright et al., 2011). More specifically, Wainwright et al. (2011) suggested that we should focus on developing new interdisciplinary approaches able to obtain information about the system's structure (spatial variability) and functions (both spatial and temporal va...

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