Aquatic macrophytes as a habitat for free-living nematodes

Abstract The composition, trophic structure and diversity of nematode assemblages associated with three aquatic macrophyte species (Polygonum amphibium, Carex sp., Ceratophyllum demersum) were surveyed. Sampled stands were present at the three sites of the north bank in the Čonakut Channel (Nature Park Kopački rit, Croatia). They were all submerged during the period of investigation, which included two vegetation seasons. Nematode abundances (expressed as a number of individuals per 100 g of macrophyte dry weight) differ between the two vegetation seasons and between the sites, but not between the macrophyte species. In total, 19 nematode species were recorded. Chromadorina viridis, C. bioculata, Brevitobrilus stefanskii, Eutobrilus notus, Prodorylaimus longicaudatus and Ethmolaimus sp. were associated with all macrophyte species. Genera Eutobrilus, Brevitobrilus and Chromadorina were present at the highest relative abundances. Species diversity (H and Simpson's D) and evenness (Pielou's J), calculated on the nematode species level, display little or no change in relation to different macrophyte species. Ceratophyllum demersum associated nematode fauna had distinct dominance of one species (Eutobrilus notus) and consequently lower evenness, which was not statistically significant. Chewers (CH) represented the dominant trophic group of total nematode abundance for all three macrophyte species followed by epistrate feeders (EF). Detritus feeders (DF) and suction feeders (SF) were represented by low relative abundances. This paper is a contribution to ecology of aquatic nematodes associated with macrophyte species in mesoeutrophic to eutrophic slow flowing channel.

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Benthic macroinvertebrates associated with four species of macrophytes

Biologia ◽

10.2478/s11756-007-0118-0 ◽

2007 ◽

Vol 62 (5) ◽

Cited By ~ 9

Author(s):

Irella Bogut ◽

Jasna Vidaković ◽

Goran Palijan ◽

Dubravka Čerba

Keyword(s):

Benthic Macroinvertebrates ◽

Aquatic Vegetation ◽

Taxonomic Composition ◽

Ceratophyllum Demersum ◽

Growing Seasons ◽

Nymphoides Peltata ◽

State Of Water ◽

Macrophyte Species ◽

Nature Park ◽

Research Period

AbstractBenthic macroinvertebrates associated with four species of macrophytes (Nymphoides peltata, Ceratophyllum demersum, Polygonum amphibium and Carex sp.) were investigated during two growing seasons (2001 and 2002) in the slow-flowing Čonakut Channel in the Kopački rit Nature Park in Croatia. A total of 31 macroinvertebrate taxa were found. C. demersum, a submerged plant with dissected leaves, supported the highest macroinvertebrate abundance, almost seven times more than N. peltata, a floating plant with undissected leaves, which harboured the lowest abundance during the research period. Chironomidae larvae (50–83%) and Oligochaeta (14–46%) were the most abundant groups recorded on all macrophyte species. Water-level fluctuation, because of its influence on the appearance and growth of aquatic vegetation, and the trophic state of water within the macrophyte stands seemed to be the main factors which affected the taxonomic composition and abundance of macroinvertebrates.

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Development and functional structure of epiphytic nematode communities on the submerged macrophyte Ceratophyllum demersum in Lake Sakadaš, Kopački Rit, Croatia

Nematology ◽

10.1163/138855409x12506855979758 ◽

2010 ◽

Vol 12 (2) ◽

pp. 289-302 ◽

Cited By ~ 2

Author(s):

Jasna Vidaković ◽

Goran Palijan

Keyword(s):

Dominant Species ◽

Functional Group ◽

Myriophyllum Spicatum ◽

Nematode Species ◽

Submerged Macrophyte ◽

Functional Structure ◽

Ceratophyllum Demersum ◽

Nematode Communities ◽

Macrophyte Species ◽

Different Parts

AbstractThe structural and functional diversity of epiphytic nematodes associated with the submerged macrophyte species, Ceratophyllum demersum, were investigated from July to September 2004 at three stations in the floodplain lake, Lake Sakadaš, Croatia. At stations I and II, C. demersum was dominant in the macrophyte patches. At station III, Myriophyllum spicatum was the dominant macrophyte species. When analysis of nematode species composition was done by grouping species with decreasing abundance, a community structure was evident on macrophytes that grew in different parts of the lake. When the abundance of nematodes was taken into account, C. demersum, which grew in different parts of the lake, was not associated with a unique nematode functional structure, and different trophic groups of nematodes were dominant at different stations. Eutobrilus nothus was the dominant nematode species for station I and chewers were the dominant functional group. Eutobrilus nothus, Eumonhystera sp. 1 and Eumonhystera filiformis vulgaris group were abundant nematode species for station II and consequently chewers and detritus feeders dominated at different periods of the investigation. Nematodes from station III were characterised by the highest nematode abundance where Chromadorina bioculata was the dominant species, and epistrate feeders were the dominant functional group. A part of our previously published results was reanalysed in this paper to enable comparison of nematode communities established on C. demersum with those developed on M. spicatum. There was no difference in the nematode functional structure between macrophyte species at the same station when the abundance of dominant species was taken into account, i.e., the same trophic structure was established.

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Feeding selectivity and growth of Nile tilapia (Oreochromis niloticus L.) fed on temperate-zone aquatic macrophytes

Czech Journal of Animal Science ◽

10.17221/4310-cjas ◽

2011 ◽

Vol 49 (No. 6) ◽

pp. 271-278 ◽

Cited By ~ 2

Author(s):

I. Šetlíková ◽

Z. Adámek

Keyword(s):

Oreochromis Niloticus ◽

Nile Tilapia ◽

Aquatic Macrophyte ◽

Myriophyllum Spicatum ◽

Dry Weight ◽

Elodea Canadensis ◽

Potamogeton Pectinatus ◽

Feeding Selectivity ◽

Nile Tilapia Oreochromis Niloticus ◽

Macrophyte Species

Feeding selectivity of Nile tilapia (Oreochromis niloticus L.) juveniles (9.3–20.9 g) to four aquatic macrophyte species and tilapia growth were studied in 4 consecutive experiments. Plant diet was provided to 8 tanks containing 20 fishes for 5 days. The fish were fed a carp diet between 4 experiments for 14 days. The consumption of 4 aquatic macrophyte species differed significantly [F(3,252) = 39.6; P < 10–6]. Elodea canadensis was the most preferred plant (Chesson selectivity index = 0.50 ± 0.05, n = 4). Potamogeton pectinatus and Spirodela polyrhiza were consumed with about equal preference. Myriophyllum spicatum was the least preferred species. Elodea canadensis contained relatively more phosphorus, potassium and ash than the other three species. The daily plant dry weight intake ranged between 0.79 and 2.26% of body weight. The fish grew during the first two experiments (SGR = 2.54 and 3.18%/d, respectively), but lost weight during the 3rd and 4th experiments (SGR = –1.75 and –1.71%/d, respectively).

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Purification of Pisciculture Waters through Cultivation and Harvesting of Aquatic Biomass

Water Science & Technology ◽

10.2166/wst.1987.0103 ◽

1987 ◽

Vol 19 (10) ◽

pp. 113-121 ◽

Cited By ~ 2

Author(s):

C. Simeon ◽

M. Silhol

Keyword(s):

Aquatic Macrophyte ◽

Dry Weight ◽

Final Decision ◽

Effluent Water ◽

Aquatic Biomass ◽

Growing Period ◽

European Climate ◽

Nuclear Plants ◽

Economical Optimization ◽

Water Hyacinths

The study of thermal wastes from the nuclear plants around Pierrelatte for agricultural, piscicultural, energy and environmental protection purposes resulted in the establishment of a pilot facility as early as 1976. An aquatic macrophyte pilot facility has been operational since 1983 to study the use of water hyacinths from the aspects of energy and ecology. The results obtained suggest that production yields for the 7 month growing period should exceed 60 metric tons (MT) (dry weight) per hectare in a European climate, and that such crops can feasibly be cultivated in temperate regions. The pilot facility is supplied with pisciculture effluent water, making it possible to quantify the stabilization power of the plants. Without primary decantation, with a retention time of 4 days and stabilization with water hyacinths only, the organic matter waste pond surface area required is 3.5 m2/m2 of pisciculture pond. Any primary or secondary facilities will lead to a reduction of these areas. The final decision will depend on the economical optimization of all the wastewater.

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Physiological Effects of Exposure to Copper and Chromium in Three Floating Aquatic Macrophyte Species

Water Air & Soil Pollution ◽

10.1007/s11270-020-04960-w ◽

2021 ◽

Vol 232 (1) ◽

Author(s):

Débora Cristina de Souza ◽

Ana Carla Fontaneli ◽

Ana Paula Peron ◽

Sandro Froehner

Keyword(s):

Aquatic Macrophyte ◽

Physiological Effects ◽

Macrophyte Species

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Sedimentation processes and sedimentary characteristics of tidal bores along the north bank of the Qiantang Estuary

Chinese Science Bulletin ◽

10.1007/s11434-012-4993-6 ◽

2012 ◽

Vol 57 (13) ◽

pp. 1578-1589 ◽

Cited By ~ 19

Author(s):

DaiDu Fan ◽

GuoFu Cai ◽

Shuai Shang ◽

YiJing Wu ◽

YanWei Zhang ◽

...

Keyword(s):

Sedimentary Characteristics ◽

The North ◽

Tidal Bores ◽

North Bank ◽

Sedimentation Processes

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A Carved Stone from D'Arcy, Saskatchewan

American Antiquity ◽

10.2307/275203 ◽

1940 ◽

Vol 5 (4) ◽

pp. 334-335

Author(s):

Vladimar Alfred Vigfusson

Keyword(s):

North America ◽

Late Pleistocene ◽

Glacial Lake ◽

Bering Strait ◽

The North ◽

Gravel Pit ◽

North Bank ◽

The Town

In recent years, the attention of some archaeologists has been directed to the Canadian Northwest with the expectation of finding some evidence or indication of the early migrations of man on this continent. That man reached North America by Bering Strait from Asia, is generally accepted, but the theory that the migrations took place in late Pleistocene times and by way of an open corridor between the Keewatin ice and the Rockies, requires confirmation. It is significant that Folsom and Yuma points from Saskatchewan, described by E. B. Howard, were found mainly in areas bordering the ancient glacial Lake Regina.As a further contribution to this problem, it seems desirable to present a brief description of a carved stone relic found in gravel in central Saskatchewan about three years ago.The stone was found about seven miles southeast of the town of D'Arcy in a gravel pit located on Sec. 9, Tp. 28, Rge. 18, W. 3rd Meridian, on the north bank of a ravine running east into Bad Lake.

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Distribution pattern of epiphytic microcrustaceans in relation to different macrophyte microhabitats in a shallow wetland (Upo wetlands, South Korea)

Oceanological and Hydrobiological Studies ◽

10.1515/ohs-2015-0015 ◽

2015 ◽

Vol 44 (2) ◽

Cited By ~ 1

Author(s):

Jong-Yun Choi ◽

Seong-Ki Kim ◽

Kwang-Seuk Jeong ◽

Gea-Jae Joo

Keyword(s):

Organic Matter ◽

Particulate Organic Matter ◽

Submerged Macrophytes ◽

Submerged Macrophyte ◽

Ceratophyllum Demersum ◽

Suitable Habitat ◽

Seasonal Growth ◽

Spirodela Polyrhiza ◽

Macrophyte Species ◽

Salvinia Natans

AbstractMacrophytes determine the physical complexity of aquatic environments and provide a suitable habitat for colonization by microcrustaceans. We evaluated the effects of a seasonal growth pattern and structure of macrophyte species on epiphytic microcrustaceans collected from macrophyte surfaces (stems and leaves) in shallow wetlands from May 2011 to October 2012. In 2011, epiphytic microcrustaceans that preferred free-floating macrophytes (Spirodela polyrhiza and Salvinia natans) and submerged macrophytes (Potamogeton crispus and Ceratophyllum demersum) were affected by the seasonal growth of these species. Epiphytic microcrustaceans were abundant on the surface of Spirodela polyrhiza in June and August and on Salvinia natans in September and October. In 2012, epiphytic microcrustaceans preferred submerged macrophyte species over the free-floating ones. The results of stable isotope analysis showed that epiphytic microcrustaceans depend on epiphytic particulate organic matter (EPOM) from each macrophyte species rather than on suspended particulate organic matter. Small species (Coronatella rectangula, Pleuroxus laevis, and Chydorus sphaericus) used EPOM (dominated by epiphytic algae) on free-floating and submerged macrophyte species; however, relatively larger species (Ilyocryptus spinifer and Macrothrix rosea) used EPOM only from submerged macrophytes. Based on these findings, we conclude that the distribution of epiphytic microcrustaceans is determined by seasonal characteristics, morphology of macrophyte species, and abundance of food resources.

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The Social Structure of Modern Bamako

Africa ◽

10.2307/1158228 ◽

1965 ◽

Vol 35 (2) ◽

pp. 125-142 ◽

Cited By ~ 4

Author(s):

Claude Meillassoux

Keyword(s):

Social Structure ◽

The North ◽

The Social ◽

North Bank ◽

Niger River ◽

Opening Paragraph ◽

The Town

Opening ParagraphAccording to a partial census taken in 1960, Bamako city has about 130,000 inhabitants. Small by Western standards, it is still by far the largest city in Mali. At the time of the French conquest Bamako had only between 800 and 1,000 inhabitants; it was the capital of a Bambara chiefdom, grouping about thirty villages on the north bank of the Niger river, with a total of about 5,000 people. The ruling dynasty was that of the Niaré, who, according to their traditions, came from the Kingi eleven generations ago (between 1640 and 1700). For defence against the neighbours and armed slave-raiders fortifications were built around the town and a permanent army of so-fa (horsemen) was raised. Soon after its foundation Bamako attracted Moslem Moors from Twat who settled as marabouts and merchants under the protection of the Niaré's warriors. Among them, the Twati (later to be called Touré) and the Dravé became, alongside and sometimes in competition with the Niaré, the leading families.

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The effect of ice phenology exerted on submerged macrophytes through physicochemical parameters and the phytoplankton abundance

Journal of Limnology ◽

10.4081/jlimnol.2015.1207 ◽

2015 ◽

Cited By ~ 1

Author(s):

Wojciech Ejankowski ◽

Tomasz Lenard

Keyword(s):

Physicochemical Parameters ◽

Aquatic Vegetation ◽

Myriophyllum Spicatum ◽

Ice Cover ◽

Water Transparency ◽

Ceratophyllum Demersum ◽

Total Biomass ◽

Eutrophic Lakes ◽

Macrophyte Species ◽

Tn:Tp Ratio

The physicochemical parameters of water, the concentration of chlorophyll-a and the submerged aquatic vegetation (SAV) were studied to evaluate the effects of different winter seasons on the biomass of macrophytes in shallow eutrophic lakes. We hypothesised that a lack of ice cover or early ice-out can influence the physicochemical parameters of water and thus change the conditions for the development of phytoplankton and SAV. The studies were conducted in four lakes of the Western Polesie region in mid-eastern Poland after mild winters with early ice-out (MW, 2011 and 2014) and after cold winters with late ice-out (CW, 2010, 2012 and 2013). The concentrations of soluble and total nitrogen, chlorophyll-a and the TN:TP ratio in the lakes were considerably higher, whereas the concentration of soluble and total phosphorus and water transparency were significantly lower after the MW compared with after the CW. No differences were found in water temperature, reaction and electrolytic conductivity. Low water turbidity linked with low concentration of chlorophyll-a after the CW resulted in increased water transparency and the total biomass of the SAV. The negative effect of the MW on the macrophyte species was stronger on more sensitive species (Myriophyllum spicatum, Stratiotes aloides) compared with shade tolerant Ceratophyllum demersum. Our findings show that the ice cover phenology affected by climate warming can change the balance between phytoplankton and benthic vegetation in shallow eutrophic lakes, acting as a shift between clear and turbid water states. We speculate that various responses of macrophyte species to changes in the water quality after two winter seasons (CW and MW) could cause alterations in the vegetation biomass, particularly the expansion of shade tolerance and the decline of light-demanding species after a series of mild winters.

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