The biology of Canadian weeds. 124. <i>Hydrocharis morsus-ranae</i> L.

Catling, Paul M.; Mitrow, Gisèle; Haber, E. S.; Posluszny, Usher; Charlton, W. A.

doi:10.4141/p02-033

Cited by 36 publications

(35 citation statements)

References 28 publications

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“…As stands containing H. morsus-ranae are developed in water rich in phosphates, total phosphorus content characterizes these conditions as hypertrophic [39]. The conditions reported in the literature as optimal for development of H. morsus-ranae can be mesotrophic [53,54], eutrophic [35,36,40,43,55] and hypertrophic [42,51,56], which is in line with our findings.…”

Section: Discussionsupporting

confidence: 81%

Trapetum natantis Müller et Görs 1960 in hydromeliorative facilities in Serbia

Putnik-Delić¹,

Ljevnaić‐Mašić²,

Nikolić³

2013

Acta Soc Bot Pol

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Trapa natans is one of the very few plants that generate so many contrasting views: it is highly endangered in Europe, invasive in North America and Australia, yet highly valued in India and China due to its nutritional and medical properties. Its endangered status in most of the Europe has prompted significant conservation efforts aimed at retention and expansion of its population. T. natans is currently on the red list of many European countries and is included under “Appendix I” of the “Convention on the conservation of European wildlife and natural habitats” (Bern Convention) and IPA list (IPA criterion A, threatened species). The unusual circumstances, i.e. endangered status of T. natans in the region on one hand and its expansion in Serbia on the other, are the reason behind this research that aims to present the distribution, floristic composition and ecological conditions of ass. Trapetum natantis stands in hydromeliorative facilities (Serbia), comprised of 28 hydrophytes. In the analyzed stands, based on the long-term phytocenological studies, we have singled out four floristic and ecological groups: the stands in which T. natans predominates, the stands with Ceratophyllum demersum, the stands with lemnids plants (Lemna minor, L. gibba, Spirodela polyrrhiza) and Salvinia natans and the stands with Hydrocharis morsus-ranae. In the researched localities, the differentiation of ass. Trapetum natantis stands is predetermined by the phosphorus and nitrate content, as well as pH and BOD₅ levels.

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Section: Discussionsupporting

confidence: 81%

Trapetum natantis Müller et Görs 1960 in hydromeliorative facilities in Serbia

Putnik-Delić¹,

Ljevnaić‐Mašić²,

Nikolić³

2013

Acta Soc Bot Pol

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“…Those potential prey items were least abundant in the shading sites. The low abundance might be a consequence of low DO (Catling et al 2003, Zhu et al 2008 or low food availability, e.g., periphytic algae (Quinn et al 1997, Melody andRichardson 2004), associated with shading. Quinn et al (1997) studied a pasture stream for 142 d and found that total invertebrate and chironomid densities declined significantly as shade increased from 60 to 90% and invertebrate taxon richness declined markedly between 90 and 98% shade.…”

Section: Effects Of Hand Pulling and Shading Methodsmentioning

confidence: 97%

“…European frogbit is an aquatic perennial that propagates primarily by vegetative means. It can negatively affect native plants by obstructing light and may affect animals by displacing food plants and altering dissolved O 2 concentrations (Catling et al 2003, Zhu et al 2008. The species can block navigation channels, irrigation ditches, and water-intake pipes, and can reduce aesthetic and recreational value of water bodies, thereby decreasing tourism and real-estate values (Catling et al 2003).…”

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confidence: 99%

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Effects of invasive European frogbit and its two physical control methods on macroinvertebrates

2015

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European frogbit (Hydrocharis morsus-ranae L.) is an invasive floating plant that negatively affects native plants in freshwater ecosystems. We conducted a field mesocosm experiment in Oneida Lake, New York (USA), to study the effect of frogbit cover on macroinvertebrates and to test the effects of 2 physical control methods, hand pulling and shading, on macroinvertebrate assemblages. We used Hester-Dendy samplers and Ekman grabs to collect surface/phytophilous and benthic macroinvertebrates. Metrics including density of different types of organisms, total abundance, taxon richness, and Simpson's diversity index were compared between control methods. Frogbit cover had significant positive effects on mollusk density, amphipod density, taxon richness, and Simpson's diversity in the Hester-Dendy surface samples. Sites with frogbit had significantly fewer benthic worms and more chironomids (Hester-Dendy bottom samples) and possibly higher diversity of benthic macroinvertebrates (Ekman samples). These data suggested that frogbit had positive effects on surface and phytophilous macroinvertebrates and may change population density and increase diversity of benthic macroinvertebrates. Hand pulling and shading did not affect macroinvertebrates except that amphipod density in surface water was significantly lower in shading sites. Therefore, from the perspective of minimizing effects on the macroinvertebrate communities in the lakes, hand pulling is preferable over shading for controlling frogbit.

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“…In Asia it is present but scarce in Turkey, the Caucasus Mts, along the southern shore of the Caspian Sea and in south-western Siberia; isolated collections are reported from central Siberia and Kazakhstan, and in Africa from northernmost Morocco and Tunisia (Cook & Lüönd 1982, Hultén & Fries 1986, Timokhina 1988). In North America it escaped from cultivation in Ottawa in the 1930s, started to spread rapidly and currently is naturalized and a noxious weed in parts of Quebec, Ontario, Michigan, New York, Vermont and Washington (Catling et al 2003). In the Czech Republic H. morsus-ranae, a free-floating aquatic, grows in standing or very slowly flowing waters such as oxbow lakes, alluvial pools, shallow edges of fishponds with low-intensity management, and sheltered edges of slowly flowing rivers and drainage and irrigation channels, where it can form dense floating mats of interlocking plants.…”

Section: Gentianellamentioning

confidence: 99%

Distributions of vascular plants in the Czech Republic. Part 7

Kaplan¹,

Danihelka²,

Chrtek³

et al. 2018

Preslia

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2018): Distributions of vascular plants in the Czech Republic. Part 7. -Preslia 90: 425-531.The seventh part of the series on the distributions of vascular plants in the Czech Republic includes grid maps of 104 taxa in the genera Anthriscus, These maps were produced by taxonomic experts based on examined herbarium specimens, literature and field records. Many of the studied native species are on the national Red List. The genus most affected by decline in abundance is Gentianella, which includes six taxa extirpated from this country and six taxa critically threatened. Another group with a high proportion of endangered species comprises aquatic and wetland plants, which are represented by Callitriche hermaphroditica, Hydrocharis morsusranae, Najas minor, Pseudognaphalium luteoalbum and Stratiotes aloides. Other ecologically specialized groups include mainly montane wetland plants (Epilobium anagallidifolium, E. nutans and Rubus chamaemorus) and plants of rocky habitats (Polypodium interjectum, Trichomanes speciosum and Woodsia ilvensis). The previously rare Woodsia alpina has been extirpated from this country. Alien species mapped in this paper include both archaeophytes and neophytes, mainly from the genera Anthriscus, Cochlearia, Elodea, Epilobium, Hordeum and Phleum. Cochlearia danica, Dittrichia graveolens and Limonium gmelinii have recently colonized habitats along the roads treated by de-icing salt. Senecio inaequidens has also spread mainly along motorways. Epilobium adenocaulon is another successful neophyte; it is now widespread throughout this country and the most successful hybrid parent within the genus. Neophyte aquatics are represented by Egeria densa, Elodea canadensis and E. nuttallii. Spatial distributions and often also temporal dynamics of individual taxa are shown in maps and documented by records included in the Pladias database and available in electronic appendices. The maps are accompanied by comments that include additional information on the distribution, habitats, taxonomy and biology of the taxa. K e y w o r d s:

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The biology of Canadian weeds. 124. Hydrocharis morsus-ranae L.

Cited by 36 publications

References 28 publications

Trapetum natantis Müller et Görs 1960 in hydromeliorative facilities in Serbia

Trapetum natantis Müller et Görs 1960 in hydromeliorative facilities in Serbia

Effects of invasive European frogbit and its two physical control methods on macroinvertebrates

Distributions of vascular plants in the Czech Republic. Part 7

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