A conceptual model for niche differentiation of biota within an extreme stream microhabitat

Rott, Eugen; Füreder, Leopold; Schütz, Cornelia; Sonntag, Bettina; Wille, Anton

doi:10.1080/03680770.2006.11903108

Cited by 10 publications

(9 citation statements)

References 1 publication

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“…In climates with defined seasons, the algae is mainly found in cold conditions; in springtime during snowmelt when daylight starts to increase, during summer/autumn in rivers flowing along glacial landscapes (Ward, 1994;Rott et al, 2006a) or in the cold running waters in the mountains (Cantonati et al, 2006). Hydrurus foetidus is easily recognizable at the time of emerging bloom from March to April, due to its brown colour and the gelatinous thalli.…”

Section: Introductionmentioning

confidence: 99%

New sites of rare cold-water golden algae Hydrurus foetidus (Villars) Trevisan (Ochrophyta: Chrysophyceae) in Croatia

et al. 2017

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Two new sites with benthic freshwater alga Hydrurus foetidus (Villars) Trevisan have been discovered in Dinaric Ecoregion of Croatia. The sites are located in two karst watercourses: Kupa River and Slušnica River. Both sites are non-shadowed aquatic habitats, with developed vegetation characteristic for clear, running waters. The alga was found during summer months at its disintegration stage, and during autumn at the beginning of its growing stage. In the Kupa River, incrusted calcium carbonate was found within the thalli of H. foetidus. After the first known record in Bijela Rijeka River from 2015, our findings represent the second and the third known localities of this species in Croatia. Even though the vegetation composition indicates high ecological status of the sites, future anthropogenic impacts and climatic changes could become a threat to this underexplored species in Croatia. Dva nova nalaza bentičke slatkovodne alge Hydrurus foetidus (Villars) Trevisan zabilježena su u dinarskoj ekoregiji u Hrvatskoj. Nalazi su locirani u dva krška vodotoka: rijeka Kupa i Slušnica. Na oba istražena nalazišta alga raste na nezasjenjenim staništima s vodenom vegetacijom makrofita karakterističnom za čiste tekuće vode. Alga je uočena tijekom ljeta u fazi raspadanja talusa te tijekom jeseni u početnoj fazi rasta. Na talusu jedinki iz rijeke Kupe primijećen je inkrustat kalcijevog karbonata. Nakon nalaza u Bijeloj rijeci 2015. godine, ovi nalazi predstavljaju drugi i treći nalaz ove rijetke vrste u Hrvatskoj. Iako sastav vegetacije ukazuje na vrlo dobro ekološko stanje na oba nalazišta, mogući antropogeni pritisci i klimatske promjene u budućnosti mogli bi ugroziti ovu nedovoljno istraže-nu vrstu u Hrvatskoj.

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Section: Introductionmentioning

confidence: 99%

New sites of rare cold-water golden algae Hydrurus foetidus (Villars) Trevisan (Ochrophyta: Chrysophyceae) in Croatia

et al. 2017

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“…Early blooms of Hydrurus in affected rivers have ecological significance as food for water insects (Ward, 1994;Milner et al, 2001) and microbial life (e.g. Rott et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

The 18S and 28S rDNA identity and phylogeny of the common lotic chrysophyteHydrurus foetidus

Klaveness

Bråte

Patil

et al. 2011

European Journal of Phycology

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Hydrurus foetidus is a geographically widespread alga commonly detected as 2-10 cm thalli in mountain streams in early spring, and also in lowland rivers at latitudes where seasonal conditions are appropriate for this cold-water species. Reaching macroscopic dimensions but with a pronounced phenotypic plasticity, this species is not typical for the golden algae (Chrysophyceae) -they are almost exclusively microscopic organisms, best known as micro-or nanoplankton in fresh water. Other sessile multicellular members are less conspicuous in nature, and rarely detected and sampled for further investigation. Therefore, the phylogenetic position of Hydrurus within the Chrysophyceae is not clear and has been disputed. We determined the 18S and 28S rDNA subunit sequences from a typical H. foetidus sampled at Finse, Hardangervidda mountain plateau, in south Norway. Phylogenetic trees inferred from concatenated 18S and 28S sequences, including representatives of all known groups of heterokonts, safely confirmed Hydrurus as a chrysophyte. Extending the taxon sampling to include nearly all available 18S chrysophyte sequences from cultured species and environmental DNA, our analysis placed H. foetidus within a separate, well-defined clade (here named the Hydrurus-clade) dominated by environmental sequences and poorly defined strains of chrysophytes in culture, mostly from cold environments. The environmental sequences derived from other mountainous regions showed high similarity and may represent homologous or closely related species. However, the phylogenetic relationship to the closest morphologically described chrysophyte clades remains unresolved. Genetic tools for investigating the Hydrurus complex are now available. An increased sampling of Hydrurus-like heterokont species as well as chrysophytes in general is crucial for understanding the evolution of this lineage and its relations to other chrysophyte clades.

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“…in ausdauernden oder zumindest langzeitlich wasserführenden Tümpeln erreicht (Rott et al 2006, 2006a, Uehlinger et al 2009 (Jumpponen 2003, Schadt et al 2003, Meyer 2004 …”

Section: Introductionunclassified

Glaziale und periglaziale Lebensräume im Raum Obergurgl

Erschbamer¹,

Koch²

2010

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The following article outlines the economic and social development of the village Obergurgl from the 17th to the 20th century. The economic character of the village changed from a mountain forming area into a tourism destination. South of the village the Rotmoos valley (Rotmoostal) is situated. It is mentioned in connection with alpinistic achievements as well as for its special postglacial landscape.

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A conceptual model for niche differentiation of biota within an extreme stream microhabitat

Cited by 10 publications

References 1 publication

New sites of rare cold-water golden algae Hydrurus foetidus (Villars) Trevisan (Ochrophyta: Chrysophyceae) in Croatia

New sites of rare cold-water golden algae Hydrurus foetidus (Villars) Trevisan (Ochrophyta: Chrysophyceae) in Croatia

The 18S and 28S rDNA identity and phylogeny of the common lotic chrysophyteHydrurus foetidus

Glaziale und periglaziale Lebensräume im Raum Obergurgl

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