Rhizome architecture for dispersal in Eleocharis palustris

1987 ◽  
Vol 65 (6) ◽  
pp. 1218-1223 ◽  
Author(s):  
R. D. Routledge
Keyword(s):  
Individual Clone ◽  
Eleocharis Palustris ◽  
Spike Rush

The rhizome architecture of a population of the spike rush, Eleocharis palustris (L.) R. & S., was examined. Its rhizomes were found to display remarkably little branching. Furthermore, the rhizomes turned very little from year to year in their direction of growth. In this paper, these observations are documented and possible evolutionary advantages of such an architecture are explored. Particular emphasis is placed on the hypothesis that the fitness of an individual clone could be enhanced by such a strategy through an increase in the probability of escape from a crowded seedbed.

Typification of Eleocharis palustris (L.) Roem. & Schult. var. reptans Parl.

Phytotaxa ◽  
2018 ◽  
Vol 375 (3) ◽  
pp. 243 ◽  
Author(s):  
LORENZO LASTRUCCI ◽  
LORENZO CECCHI ◽  
DANIELE VICIANI
Keyword(s):  
Eleocharis Palustris

Eleocharis palustris (Linnaeus 1753: 70) Roemer & Schultes (1817: 151) belongs to the Eleocharis Brown (1810: 224) subser. Eleocharis (Bureš et al. 2004). In Europe (see Walters 1980, Jiménez-Mejías & Luceño 2011, Pignatti 2017), two subspecies are widely accepted and reported: E. palustris subsp. palustris and E. palustris subsp waltersii Bureš & Danihelka (2008: 227) [≡ E. palustris subsp. vulgaris Walters (1949: 194), nom. illeg.].

scholarly journals Plant composition and species relations on the Huntingdon Marsh, Quebec

1973 ◽  
Vol 51 (6) ◽  
pp. 1231-1247 ◽  
Author(s):  
Allan N. Auclair ◽  
André Bouchard ◽  
Josephine Pajaczkowski
Keyword(s):  
Water Depth ◽  
Plant Biomass ◽  
Dry Weight ◽  
Weight Basis ◽  
Species Variation ◽  
Species Relationships ◽  
Sedge Meadow ◽  
Calamagrostis Canadensis ◽  
Meadow Communities ◽  
Eleocharis Palustris

The purpose of this study was to identify significant species relationships and underlying ecological gradients characteristic of the Huntingdon Marsh, Quebec. In 1970, one hundred and seven 1-m2 samples of plant biomass were obtained from the marsh in conjunction with environmental measurements. These data were later analyzed using principal-components analysis.The marsh complex divided unambiguously into emergent aquatic and sedge meadow communities on the basis of distinct environmental and compositional differences. Equisetum fluviatile, Scirpus fluviatilis, Eleocharis palustris, and Scirpus validus were major species in the emergent aquatic community. Respectively, these species dominated 29, 25, 16, and 14% of 51 quadrats on a dry weight basis. Water depth accounted for almost one-third of the species variation in this community. Interaction between submerged and floating forms and competitive exclusion between dominant species explained much of the remaining species variance.On a dry weight basis, Carex aquatilis, C. lacustris, Calamagrostis canadensis, and Typha angustifolia dominated 36, 16, 16, and 11% of the 56 quadrats on the sedge meadow. As a group, Carex spp. dominated 63% of the quadrats. Disturbance related to chance perturbations, water depth, and the incidence of fire accounted for much of the variation in this community.The organization of emergent and sedge meadow communities was discussed in relation to continuum and community concepts with particular reference to relative changes in discontinuity of species relationships across the environmental gradient.

scholarly journals Current distribution of Pilularia globulifera L. in Poland – changes of geographical range and habitat preferences

2012 ◽  
Vol 82 (1) ◽  
pp. 37-46 ◽  
Author(s):  
Ewa Szczęśniak ◽  
Stanisław Rosadziński ◽  
Krzysztof Spałek ◽  
Mariusz Szymanowski ◽  
Agnieszka Kreitschitz ◽  
...  
Keyword(s):  
Habitat Preferences ◽  
Typha Angustifolia ◽  
Anthropogenic Habitats ◽  
New Localities ◽  
New Locations ◽  
Spontaneous Vegetation ◽  
Eastern Border ◽  
Northwestern Poland ◽  
Eleocharis Palustris ◽  
Continuous Range

<em>Pilularia globulifera </em>is a subatlantic European fern threatened with extinction. In Poland, it reaches the eastern border of its continuous range. Up to the end of the 20th century, it was observed here in 21 stands; only 2 of them existed by the second half of the century, so the species was categorized as critically endangered. Five new locations have been found in western and northwestern Poland during the last 10 years. Abundant and permanent populations grow in 3 locations, while 2 stands were ephemeral. All the current stands are situated in anthropogenic habitats with spontaneous vegetation, in oligotrophic to eutrophic waters. One of the new localities is about 280 km distant from the eastern range of the limit known previously. <em>Pilularia </em>forms its own plant community <em>Pilularietum globuliferae</em>, enters plots of <em>Ranunculo-Juncetum bulbosi </em>and occurs in mesotrophic to eutrophic rushes of <em>Eleocharis palustris</em>, <em>Phragmites australis</em>, <em>Typha angustifolia </em>and <em>Equisetum fluviatile</em>. Specimens are vigorous and regularly produce sporocarps.

scholarly journals Longitudinal tracking of Plasmodium falciparum clones in complex infections by amplicon deep sequencing

2018 ◽  
Author(s):  
Anita Lerch ◽  
Cristian Koepfli ◽  
Natalie E. Hofmann ◽  
Johanna H. Kattenberg ◽  
Anna Rosanas-Urgell ◽  
...  
Keyword(s):  
Plasmodium Falciparum ◽  
Papua New Guinea ◽  
Deep Sequencing ◽  
Polymorphic Marker ◽  
Additional Parameter ◽  
Force Of Infection ◽  
Individual Clone ◽  
Longitudinal Tracking ◽  
Infection Dynamics ◽  
Higher Sensitivity

AbstractBackgroundLongitudinal tracking of individual Plasmodium falciparum strains in multi-clonal infections is essential for investigating infection dynamics of malaria. The traditional genotyping techniques did not permit tracking changes in individual clone density during persistent natural infections. Amplicon deep sequencing (Amp-Seq) offers a tool to address this knowledge gap.MethodsThe sensitivity of Amp-Seq for relative quantification of clones was investigated using three molecular markers, ama1-D2, ama1-D3, and cpmp. Amp-Seq and length-polymorphism based genotyping were compared for their performance in following minority clones in longitudinal samples from Papua New Guinea.ResultsAmp-Seq markers were superior to length-polymorphic marker msp2 in detecting minority clones (sensitivity Amp-Seq: 95%, msp2: 85%). Multiplicity of infection (MOI) by Amp-Seq was 2.32 versus 1.73 for msp2. The higher sensitivity had no effect on estimates of force of infection because missed minority clones were detected in preceding or succeeding bleeds. Individual clone densities were tracked longitudinally by Amp-Seq despite MOI>1, thus providing an additional parameter for investigating malaria infection dynamics.ConclusionAmp-Seq based genotyping of longitudinal samples improves detection of minority clones and estimates of MOI. Amp-Seq permits tracking of clone density over time to study clone competition or the dynamics of specific, i.e. resistance-associated genotypes.

scholarly journals IDENTIFIKASI GULMA TANAMAN PADI (Oryza sativa L. var. Ciherang) SUMATARA SELATAN

2018 ◽  
Vol 1 (1) ◽  
pp. 40-44
Author(s):  
Syarifah Syarifah ◽  
Ike Apriani ◽  
Ra Hoetary Tirta Amallia
Keyword(s):  
Critical Period ◽  
Research Method ◽  
Cynodon Dactylon ◽  
Oryza Sativa L ◽  
Rice Fields ◽  
Cultivated Plants ◽  
Ageratum Conyzoides ◽  
Poaceae Family ◽  
Eleocharis Palustris ◽  
Descriptive Method

The growth of weeds in the rice fields can reduce production. Weed is a disrupting plant that grows and spreads rapidly so it becomes a nutritional competitor for cultivated plants. This study aims to identify rice weeds in the fields of Rimau District, Banyuasin, South Sumatra. The research method used was descriptive method with purposive sampling on wetland rice fields of the Ciherang variety. Sampling was carried out in a critical period (3-6 weeks after planting) in rice fields. The results of weed identification obtained 6 families consisting of 15 species, namely Ageratum conyzoides L., Crassocephalum crepidioides, Cleome rutidisprema DC., Cyperusroduntus L. Cyperus compressus, Eleocharis palustris L., Frimbristylis miliacea L. Vahl, Phylanthus naruri L., Eurphobia hirta, Cynodon dactylon (L.) Press., Digitaria ciliaris (Retz.) Koel., Echinochola colona (L.) Link., Eleusinindica (L.) Gaertn., Paspalum scrobiculatum L., Ludwigia octovalvis (Jacq.) Raven. The Poaceae family is most commonly found as a rice weed in Rimau District, South Sumatra.

scholarly journals A New Species of Spike-Rush for Saskatchewan

Blue Jay ◽  
1965 ◽  
Vol 23 (4) ◽  
Author(s):  
John H. Hudson
Keyword(s):  
New Species ◽  
A New Species ◽  
Spike Rush

Cytogeographical survey ofEleocharis subser.Eleocharis in Europe 1:Eleocharis palustris

2004 ◽  
Vol 39 (3) ◽  
pp. 235-257 ◽  
Author(s):  
Petr Bureš ◽  
Olga Rotreklová ◽  
Sierra Dawn Stoneberg Holt ◽  
Radim Pikner
Keyword(s):  
Eleocharis Palustris

Eleocharis compressa × Eleocharis erythropoda, a new natural hybrid spike rush from Ontario

1994 ◽  
Vol 72 (6) ◽  
pp. 837-842 ◽  
Author(s):  
P. M. Catling
Keyword(s):  
Surface Roughness ◽  
Cross Section ◽  
Cross Sections ◽  
Roughness Length ◽  
Putative Hybrid ◽  
Natural Hybrid ◽  
Surface Roughness Length ◽  
Hybrid Plants ◽  
Section Shape ◽  
Spike Rush

Partially sterile plants from eastern Ontario are identified as Eleocharis compressa × Eleocharis erythropoda on the basis of intermediacy in perianth bristle length, tubercle shape, achene surface roughness, length of rhizome internodes, culm cross-section shape, and length of terminal lobes of scales. Both putative parents occurred with the hybrid plants. The hybrid plants had tardily deciduous scales and either bifid or trifid styles. They superficially resemble E. erythropoda most closely but differ markedly in their scaly rhizomes with shorter internodes 3.8 – 7 mm long. They are most readily distinguished from E. compressa by their elliptic or broadly rectangular culm cross sections and some perianth bristles exceeding 0.5 mm in length. This putative hybrid involves taxa in different subseries that would normally be regarded as too distantly related to permit hybridization. Key words: Eleocharis compressa, Eleocharis erythropoda, Cyperaceae, hybrid, taxonomy, classification.

Foraging characteristics of Canada geese on the Nisutlin River delta, Yukon

1987 ◽  
Vol 65 (10) ◽  
pp. 2358-2361 ◽  
Author(s):  
T. S. Coleman ◽  
D. A. Boag
Keyword(s):  
Dominant Species ◽  
Food Selection ◽  
Yukon Territory ◽  
Water Levels ◽  
River Delta ◽  
Intermediate Water ◽  
Canada Geese ◽  
Plant Associations ◽  
South Central ◽  
Eleocharis Palustris

Food selection by Canada geese (Branta canadensis), staging in the autumn on the Nisutlin River delta in the south central Yukon Territory, was investigated between August and October of 1981, 1982, and 1983. Three distinct plant associations were used by the foraging geese: an aquatic association in which rhizomes of Potamogeton richardsonii, the dominant species, were eaten; a terrestrial and more vegetatively complex association in which Equisetum palustre was the main plant taken; and an association of almost pure stands of Equisetum fluviatile in wet depressions behind old river levees. Availability of these feeding zones depended on water levels on the delta. When water levels were low (October 1982), all feeding zones were available, yet the geese fed almost entirely in the Potamogeton zone, indicating a preference for that zone. At intermediate water levels, Potamogeton richardsonii was no longer available and the geese grazed on the complex vegetative zone, taking Equisetum palustre, Ranunculus reptans, and Eleocharis palustris in the ratio of their relative availability (85:10:5). Only when water levels were high did the geese graze exclusively in the Equisetum fluviatile zone, the least preferred.

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