The regression of similarity against distance unites several ecological phenomena, and thus provides a highly useful approach for illustrating the spatial turnover across sites. Our aim was to test whether rates decay in community differ between diatom growth forms suggested show different dispersal ability. We hypothesized that group with lower ability (i.e. periphyton) would higher than plankton).Periphyton phytoplankton samples were gathered at sites distributed over an area approximately...

Throughout history, mineral springs have been utilized worldwide for various purposes. In the French Massif Central, numerous springs, such as CO2-rich Ceix Spring, historically significant. The spring was formerly used manufacture of statuettes by petrifying objects. December 2019, restored to create a natural area downstream point emergence (water catchment that remains confined within small, enclosed building), including formation spring-associated travertines. From January 2020 March...

The taxonomy of several small-celled, ecologically significant Nitzschia species, which are frequently confused with each other or whose names misapplied, is clarified. Following an examination type material and modern samples by light electron microscopy, it was concluded that N. frustulum (Kützing) Grunow, inconspicua soratensis E. Morales & Vis invisitata Hustedt independent species. No morphological basis found for separating var. subsalina boliviana from they therefore placed in...

The identity and nomenclatural history of several small-celled naviculoid taxa are revisited.The species discussed here important from the ecological point view since they often dominant in benthic freshwater communities.The original concepts that have suffered major taxonomic drift due to their entangled discussed, forgotten epithets resurrected.We examined material Navicula aggerica E. reichardt, atomoides GrunoW, N. crassulexigua e.

A large amount of studies focuses on aquatic diatoms’ ecology and their use in the assessment water quality. Little is known about terrestrial ecological behaviour sensitivity to environmental factors. We hypothesise that diatom communities can serve as a proxy anthropic disturbance levels sites. To test our hypothesis, we apply an index soil deliver new information physiographic controls diatoms. Diatom samples were collected Attert River basin Luxembourg during three seasons, sites...

Abstract. Diatoms (Bacillariophyta) are one of the most common and diverse algal groups (ca. 200 000 species, ≈ 10–200 μm, unicellular, eukaryotic). Here we investigate potential aerial diatoms (i.e. nearly exclusively occurring outside water bodies, in wet, moist or temporarily dry places) to infer surface hydrological connectivity between hillslope-riparian-stream (HRS) landscape units during storm runoff events. We present data from Weierbach catchment (0.45 km2, northwestern Luxembourg)...

Planothidium marganaiensis sp. nov. is described from periphytic samples collected at the karst spring San Giovanni Domusnovas, Sardinia (Italy). Light and scanning electron microscope observations revealed that taxon shares similarities with species within frequentissimum sensu lato, such as P. naradoense victori. seems to be morphologically closely related but stands out for its smaller valves, lower striae density, subrostrate slightly protracted apices, areolation pattern of in rapheless...

Mayamaea sardiniensis sp. nov. is described from periphytic diatom samples collected in a small thermo-mineral spring Sardinia (Italy), based on morphological approach. In light and scanning electron microscopy, the species revealed presence of typical features genus Mayamaea, as reported original diagnosis, including elliptical to oval valve outline, broadly rounded apices, uniseriate striae composed round areolae occluded by external hymenes. shares strong similarities with M. cavernicola...

Response of epilithic diatom communities to environmental gradients in subtropical temperate Brazilian riversThis work aims analyse the response southern rivers contribute development a widely applicable methodology for water-quality monitoring.Samples physical, chemical and biological determination were collected monthly, from December 2001 November 2002 March 2003 February 2004, at 9 stations along Pardo Pardinho hydrographical basin Rio Pardo, State Grande do Sul (RS), Brazil.Physical...

Sea turtles are distributed in tropical and subtropical seas worldwide. They play several ecological roles considered important indicators of the health marine ecosystems. Studying epibiotic diatoms living on turtle shells suggestively has great potential study behavior because always there. However, diatom identification at species level is time consuming, requires well-trained specialists, there a high probability finding new taxa growing shells, which makes tricky. An alternative approach...

Like aquatic diatoms, terrestrial diatoms are sensitive to multiple environmental factors such as pH, anthropic disturbances, soil moisture and nitrogen. While most diatom species have well-known autecological values for several important variables, qualifying them biological indicators, this potential has not yet been untapped diatoms. Here, we aim establish pH content using weighted averaging common, widespread compare with previous calculated indicator tolerance ranges. In order provide...

Abstract Connectivity between different landscape units and flow paths to the stream has gained much attention in hydrological science. Recent work focused on threshold sequencing of spatial sources upland forested watersheds, connectivity its patterns hillslope–riparian–stream continuum. Fast path HRS continuum is still difficult decipher because scale‐limitations hydrometric tracer methods. Such may be strongly non‐linear controls streamflow response chemistry. Recently, diatoms, one most...

The type material of Achnanthidium lanceolatum (transferred in 1999 to the genus Planothidium) is investigated reveal identity several Planothidium populations from Antarctic Region.The morphology and ultrastructure was analysed using light scanning electron microscopy.The results this analysis revealed presence two so far undescribed species material.Both are described as new science: P. rostrolanceolatum Van de VijVer, KopaloVá et zidaroVa sp.nov.and subantarcticum VijVer c.e.Wetzel...

Diatoms are generally regarded as inhabitants of water bodies. However, numerous taxa able to survive and reproduce in a variety non-aquatic ecosystems. Although terrestrial diatoms discussed extensively the literature, most those studies covered floristic aspects few information exists on their ecology. This lack knowledge thwarts potential use environmental markers various applications. As way forward, we investigated seasonal patterns role different disturbances community composition. We...

The former Synedra rumpens complex has long puzzled diatom taxonomists.In the nineteenth century, many infraspecific taxa were described as varieties or forms of S. rumpens.In present study, type material and several such var.fragilarioides familiaris f. parva major was investigated using LM SEM observations.For comparison, original other relevant (such Fragilaria perdelicatissima, F. spinaspeciosa, campyla, vaucheriae var.distans) also analysed.The results based on these comparisons show...