The role of environmental variables in structuring epiphytic and epilithic diatom assemblages in springs and streams of the Dolomiti Bellunesi National Park (south-eastern Alps)

Cantonati, Marco; Spitale, Daniel

doi:10.1127/1863-9135/2009/0174-0117

Cited by 81 publications

(86 citation statements)

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“…The very low valve concentrations in these samples may have various reasons and it is not clear which contributed exactly. Cantonati & Spitale (2009) and Cantonati et al (2012b) made similar observations in a few iron-rich springs, but this was not an apparent feature here. Fránková et al (2009) observed poor valve silicification in petrifying springs, concurring with somewhat lower silica concentrations than in less mineral-rich fens.…”

Section: Discussionsupporting

confidence: 57%

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Diatom assemblages of non-living substrates in petrifying Cratoneurion springs from lower Belgium

Denys¹,

Oosterlynck²

2015

Fottea

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Diatom assemblages were examined from non-living substrates in thirteen springs supporting the Natura 2000 habitat type 'Petryfing springs with tufa formation' in the southern part of Flanders. More than 300 taxa were recorded, including some which appear to be particularly associated with this kind of environment. Even though a number of characteristic taxa and diatoms characterizing fast-flowing springs of more elevated terrain remained absent, local species richness was higher than reported from carbonate springs elsewhere in Europe. Relative abundance of 'Red List' taxa was, however, substantially lower. Taxon richness was not related to measured nutrients but increased with diatom-inferred trophic status. Assemblages consisted mainly of motile, small-celled species of Achnanthidium, Amphora, Caloneis, Planothidium and Stauroneis. Hygropetric rheocrenes presented a somewhat more distinct assemblage than helocrene and rheohelocrene settings, but overall, compositional metrics were similar among spring types. Assemblages were structured mainly along gradients of pH, major ions (in particular magnesium and potassium) and nitrate relating to calcite precipitation, aquifer and nitrogen supply. Besides substantiating broad similarities among Cratoneurion springs, the results provide arguments for a regionalized approach towards assessment of their diversity, community structure and conservation status.

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Section: Discussionsupporting

confidence: 57%

“…Although shade was found to be important elsewhere (Cantonati 1998;Cantonati & Pipp 2000;Cantonati & Spitale 2009), it was not singled out as such in this case. Its alignment with nitrate prevented to establish a clear response, but it was also fairly intense at most places.…”

Section: Discussionmentioning

confidence: 87%

Diatom assemblages of non-living substrates in petrifying Cratoneurion springs from lower Belgium

Denys¹,

Oosterlynck²

2015

Fottea

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“…Streams are on average more impacted and altered than springs. This was confirmed by qualitative observations by Cantonati and Spitale [52], who compared 16 springs and 5 streams in the Dolomiti Bellunesi National Park. Even if the low number of streams did not allow for statistical testing, some qualitative results, such as the occurrence of typical pollution-tolerant diatoms in streams only and of rare and new-to-science species in springs only, support this interpretation.…”

Section: Discussionsupporting

confidence: 65%

To What Extent Are Swiss Springs Refugial Habitats for Sensitive and Endangered Diatom Taxa?

Taxböck

Linder

Cantonati

2017

Water

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Abstract:Habitat alteration is one of the major drivers of species loss. Springs may be among the least affected aquatic habitats and are considered to be refugial habitats. Diatom assemblages were sampled from 74 Swiss springs comprising seven spring types over a wide altitudinal and ecological range as well as a wide range of anthropogenic modifications (alterations). Each spring was assigned to a five-point alteration scale, from natural to heavily altered. In total, 504 diatom species were recorded (not including 36 taxa that could not be identified to species level) from five microhabitats, and coded according to rarity and Red List status. The results of this extensive spring-habitat diatom survey were compared statistically with a large stream diatom dataset (DI-CH). The spring diatom microflora was more species rich and included more rare and/or threatened species than the stream microflora. The proportion of Red List species and rare species was highest in the DI-CH dataset, but the proportion of species with no Red List status and rare species was the highest in springs. Species richness, Red List status, and rarity were significantly related to the degree of spring alteration. This is consistent with the hypothesis that unaltered springs function as refuges for the Swiss fresh water microflora, and that they can be regarded as "least-impaired habitats". These may be critically important for the conservation of the European freshwater diatom microflora.

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“…After detailed investigation we identifi ed it as Diadesmis fukushimae LangeBertalot, M. Werum & Broszinski (WERUM and LANGE-BERTALOT 2004). The only previous European record of this diatom has been from the Grotta Guernica spring (Dolomiti Bellunesi National Park, south-eastern Alps, Italy) as reported by CANTONATI and SPITALE (2009)…”

Section: Introductionmentioning

confidence: 81%

A new European record of Diadesmis fukushimae and its transference to Humidophila genus (Bacillariophyta)

Kövér

Korponai

Harangi

et al. 2015

Acta Botanica Croatica

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-Diadesmis fukushimae, a rare oligotraphenic diatom, was found in some high mountain lakes of Romania. Its occurrence in the Parâng and Retezat Mountains is the second European record of the species. To date D. fukushimae has been known only from the type locality (Shenandoah National Park, Virginia, USA) and from a spring (Grotta Guernica, Dolomiti Bellunesi National Park (south-eastern Alps, Italy). Investigation by scanning electron microscopy showed that this species should be transferred to the recently established genus Humidophila. A new combination is proposed, Humidophila fukushimae. The morphological details of the European population are also presented.

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The role of environmental variables in structuring epiphytic and epilithic diatom assemblages in springs and streams of the Dolomiti Bellunesi National Park (south-eastern Alps)

Cited by 81 publications

References 0 publications

Diatom assemblages of non-living substrates in petrifying Cratoneurion springs from lower Belgium

Diatom assemblages of non-living substrates in petrifying Cratoneurion springs from lower Belgium

To What Extent Are Swiss Springs Refugial Habitats for Sensitive and Endangered Diatom Taxa?

A new European record of Diadesmis fukushimae and its transference to Humidophila genus (Bacillariophyta)

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