New and noteworthy bryophyte records from lacustrine drawdown zones in Croatia

Rimac, Anja; Šegota, Vedran; Alegro, Antun; Koletić, Nikola; Vuković, Nina; Papp, Beáta

doi:10.13158/heia.32.2.2019.315

Cited by 9 publications

(6 citation statements)

References 22 publications

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“…Besides the primary intention of the WFD to ensure water quality assessment on the national level, the implementation of monitoring in Croatia yielded a significant amount of new national bryophyte records. Through five years of intensive field surveys of Croatian freshwaters, as many as eight bryophyte species were found as new for national bryoflora: Fissidens fontanus ( Alegro et al 2019 , Šegota et al 2019 ), Dichodontium flavescens , Ricciocarpos natans ( Alegro et al 2019 ), Physcomitrium eurystomum ( Rimac et al 2019b ), Physcomitrium sphaericum ( Ellis et al 2020 ), Riccia rhenana ( Ellis et al 2020 ) and Bryum klinggraeffii and Philonotis marchica ( Rimac et al 2021 ). In addition, several rare or doubtful species with only old historical data have been confirmed ( Fissidens arnoldii , Hygroamblystegium fluviatile , Leptobryum pyriforme , Physcomitrium patens , Riccia cavernosa , R. frostii , R. glauca ) within this study.…”

Section: Discussionmentioning

confidence: 99%

“…In general, the knowledge of the Croatian bryophyte flora is still insufficient and virtually all recent field studies have revealed new national records (e.g. Papp et al 2013 , Sabovljević et al 2018 , Alegro et al 2019 , Rimac et al 2019a , Rimac et al 2019b , Ellis et al 2020 , Šegota et al 2021b , Šegota et al 2021c , Ellis et al 2021a , Ellis et al 2021b ). However, some species, regarded as common on a European level, have been recorded in only a few localities in Croatia ( Alegro and Šegota 2022 ), indicating the necessity of further research into the bryophytes.…”

Section: Introductionmentioning

confidence: 99%

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Croatian freshwater bryoflora–diversity and distribution

Rimac¹,

Šegota²,

Alegro³

et al. 2022

BDJ

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An extensive macrophyte field survey of running and standing waters was conducted from 2016 to 2021 at 786 sampling sites across Croatia as a part of the implementation of the Water Framework Directive. This survey is the first to present a comprehensive floristic catalogue of the freshwater bryoflora, along with an analysis of the distribution and diversity patterns on a national level. In all, 83 bryophyte species (68 mosses and 15 liverworts) were recorded in the 228 sites, with average species richness of 4.17 species per site. The most frequent species were Fontinalis antipyretica, Rhynchostegium riparioides, Leptodictyum riparium and Cratoneuron filicinum. The majority of the species encountered were rarely found, with over 70% of species recorded on less than 10 sampling sites and the majority of the species not being truly aquatic, rather being classified as facultative aquatics. The Dinaric Ecoregion, characterised by clean, cold, fast-flowing karstic rivers, especially in the Continental Subecoregion, supported higher freshwater bryophyte diversity than the lowland Pannonian Ecoregion, with mostly slow, eutrophic lowland watercourses with unstable sandy and gravelly alluvial sediments. Chorological comparison of Croatian eco- and subecoregions revealed the expected dominance of circumpolar and European elements, i.e. temperate chorotypes, as well as some biogeographical differences. The most frequent life forms were aquatic trailings and turfs. Amongst the recorded species, perennials and colonists were the most represented life strategies. The analysis of both the life-form and life-strategy spectra showed some differences amongst the Croatian regions, supporting the fact that the Dinaric Ecoregion provides more truly aquatic habitats and microhabitats suitable for the freshwater bryophytes, while in the Pannonian Ecoregion freshwater bryophytes dominantly inhabit the periodically submerged riparian zones, for example shaded lowland forest streams and rivulets or gently sloping margins of rivers and lakes.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Croatian freshwater bryoflora–diversity and distribution

Rimac¹,

Šegota²,

Alegro³

et al. 2022

BDJ

Self Cite

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“…As the data used in this study were gathered in the course of the national macrophyte monitoring conducted for the purpose of assessing the ecological status of waterbodies as required by the WFD, we want to emphasize the importance of its implementation, as it encouraged research into freshwater bryophytes and their ecology on a national [15,22,[67][68][69][70][71][72] and European level [1,2,4,5,14,28,29,50,51,53] by including this group as a part of macrophyte vegetation. Our research is the first into the ecology of the aquatic bryophytes in Croatia, exploring the ecological responses of the most frequent species and determining the influence of different environmental variables on their occurrence.…”

Section: Discussionmentioning

confidence: 99%

Ecological Preferences and Indication Potential of Freshwater Bryophytes–Insights from Croatian Watercourses

Rimac

Alegro

Šegota

et al. 2022

Plants

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A comprehensive survey of Croatian watercourses covering the whole of the national territory and investigating inherent watercourse heterogeneity was conducted to explore the ecological responses of the most frequent freshwater bryophytes with respect to water chemistry variables and land use within the catchment area. Direct multivariate ordination (CCA) of vegetation data paired with 18 environmental variables revealed that freshwater bryophytes and their assemblages were segregated along the gradients of water chemistry and the proportion of natural and urban area within the catchment. Generalized additive models (GAM) were employed to explore the ecological responses of individual species. The results showed that most of the investigated species preferred natural, clean, well-oxygenated watercourses, with low nutrient and organic matter content, as well as with low electrical conductivity. Species such as Palustriella falcata, Eucladium vertcillatum, Dichodontium flavescens and Jungermannia atrovirens had narrow ecological niches and were restricted to pristine watercourses, while the most frequent and widely distributed species, such as Fontinalis antipyretica, Rhynchostegium riparioides, Cratoneuron filicinum, Fissidens crassipes, Cinclidotus fontinaloides and C. riparius, had a wide ecological tolerance. Riccia fluitans and Leptodyctium riparium had wide ecological ranges, but with optima in hypereutrophic waters with high nutrient and organic content, as well as high electrical conductivity. Furthermore, these two species were frequently associated with a high share of intensive agriculture and a low share of natural land within the catchment.

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“…Physcomitrium eurystomum Sendtn. is an episodic species, typically occupying the exposed mud of freshwater wetlands (Nieuwkoop 2016;Rimac et al 2019;Callaghan et al 2020b). It produces sporophytes abundantly and releases its large spores (30-40 μm diameter) close to the soil surface (2-5 mm height).…”

Section: Introductionmentioning

confidence: 99%

Long-term survival of bryophytes underground: an investigation of the diaspore bank of Physcomitrium eurystomum Sendtn.

Callaghan¹,

During

Yang

2022

Journal of Bryology

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Introduction. Bryophyte diaspore banks are a critical aspect of the life strategy of some species yet remain neglected and poorly understood. This study investigated the longevity in natural habitat of the diaspore bank of Physcomitrium eurystomum Sendtn., a moss species that is threatened with extinction in Europe. Methods. Undisturbed soil cores of 40 cm depth were collected from Langmere, Norfolk, UK, and were split into investigated sediment layers of 1 cm depth. Dating of sediment layers was done by an analysis of radionuclides, and diaspore germination trials of each layer were carried out in a growth chamber. DNA barcoding was used to help identify plants that germinated. Key results and conclusions. Viable diaspores of Physcomitrium eurystomum frequently occurred in sediment layers that were at least 100 years old and continued to occur in much lower layers that were probably several hundred years old. The long-term survival of bryophytes underground can have important implications for conservation decisions.

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New and noteworthy bryophyte records from lacustrine drawdown zones in Croatia

Cited by 9 publications

References 22 publications

Croatian freshwater bryoflora–diversity and distribution

Croatian freshwater bryoflora–diversity and distribution

Ecological Preferences and Indication Potential of Freshwater Bryophytes–Insights from Croatian Watercourses

Long-term survival of bryophytes underground: an investigation of the diaspore bank of Physcomitrium eurystomum Sendtn.

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