scholarly journals The role of tubificid worms (Limnodrilus hoffmeisteri) in sediment resuspension: a microcosm study

2014 ◽  
Vol 50 (3) ◽  
pp. 253-260 ◽  
Author(s):  
Lei Zhang ◽  
Jingge Shang ◽  
Wei He ◽  
Bensheng You ◽  
Chengxin Fan
Keyword(s):  
Sediment Resuspension ◽  
Limnodrilus Hoffmeisteri ◽  
Microcosm Study ◽  
Tubificid Worms

Role of Tubificid Worms on Nitrogen Transformations in Stream Sediment

1979 ◽  
Vol 36 (6) ◽  
pp. 673-678 ◽  
Author(s):  
L. Chatarpaul ◽  
J. B. Robinson ◽  
N. K. Kaushik
Keyword(s):  
Initial Period ◽  
Organic Content ◽  
Stream Sediment ◽  
Tubifex Tubifex ◽  
Nitrogen Transformations ◽  
Nitrate N ◽  
Limnodrilus Hoffmeisteri ◽  
Significant Difference ◽  
Tubificid Worms

Sediments obtained from Swifts Brook were highly organic whereas those from Canagagigue Creek were coarse-textured with relatively little organic content. Columns of sediment were overlain with continuously aerated 10 mg/L nitrate-N solution or distilled water. When columns of Canagagigue sediment with tubificid worms (Tubifex tubifex and Limnodrilus hoffmeisteri) were incubated for 33 d they lost nitrate-N at a significantly higher rate (P < 0.01) than did columns without worms. Following the initial period of nitrate disappearance (resulting from denitrification in the sediment) nitrate-N increased again, this increase being greatest in the presence of worms. The increasing concentration of nitrate-N probably resulted from nitrification which was masked early in the experiment by rapid denitrification. In columns with Swifts Brook sediment, added nitrate disappeared rapidly but no significant difference was observed between the columns with worms and those without; nitrate-N concentration was never observed to increase. Possibly both nitrification and denitrification are also enhanced here by the presence of tubificids but the effects are masked. Key words: tubificids, denitrification, nitrification, stream sediment, nitrate, ammonium, fecal pellets

scholarly journals Checklist of Aquatic Oligochaetes Species in Tigris–Euphrates River basin

2014 ◽  
Vol 11 (3) ◽  
pp. 1397-1404 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Single Species ◽  
Abundant Species ◽  
Tubifex Tubifex ◽  
Euphrates River ◽  
Tigris River ◽  
Limnodrilus Hoffmeisteri ◽  
Frequent Species ◽  
Aquatic Oligochaetes ◽  
Stylaria Lacustris ◽  
Tubificid Worms

A total of 60 species of aquatic oligochaetes were identified in different sites within Tigris-Euphrates basin / Iraq, including River Tigris, River Euphrates, Southern marshes ( Al-Haweiza , Al-Hammar and Al-Chebaiesh ) , Shutt Al-Germa, and Shatt Al-Arab. In River Euphrates 39 species were identified, 40 species from River Tigris and 32 species from Shatt-Al-Arab and southern marshes.The identified species were classified as four species of Family Aeolosomatidae, 54 species of Naididae ( 31 Naidinae , 8 Pristininae and 15 Tubificid worms), one species of each of Lumbriculidae ( Lumbriculus variegates ) and Lumbricidae ( Eiseiella tetraedra). Among Aeolosomatidae , Aelosoma aquaternarium, A. Liedyi, A. variegatum and A. hemprichi, in which, A. variegatum was the most frequent species, found in Euphrates river. Naidinae community were represented by five species of genus Chaetogaster, two species of each of Paranais, Slavina, & Stylaria, four species of Allonais , and seven species of each of Dero and Nais, in addition to Stephensoniana trivandrana, Specaria josinae and Ophidonais serpentina. Nais variabilis was the most abundant and frequent species in River Tigris while Stylaria lacustris & Ophidonais serpentina are abundant in River Euphrates . Species of Pristininae were representative by four species of genus Pristina and three species of genus pristinella, among them Priatina longiseta is the most abundant species.Tubificid worms, Branchuira sowerbyi and Limnodrilus hoffmeisteri were the most frequent and abundant species in the surface sediments of Iraqi waters. Beside L. hoffmeisteri , other five species of Limnodrilus, two species of Potomothrix, and a single species of Tubifex tubifex , Embolocephalus velutinus, Aulodrilus piguetia, Psammoryctides moravicus and Rhyacodrilus coccineus were recorded.

Role of Sediment Resuspension in the Remobilization of Particulate-Phase Metals from Coastal Sediments

2007 ◽  
Vol 41 (7) ◽  
pp. 2282-2288 ◽  
Author(s):  
Linda H. Kalnejais ◽  
William R. Martin ◽  
Richard P. Signell ◽  
Michael H. Bothner
Keyword(s):  
Sediment Resuspension ◽  
Coastal Sediments ◽  
Particulate Phase

scholarly journals Role of Sediment Resuspension on Estuarine Suspended Particulate Mercury Dynamics

2018 ◽  
Vol 52 (14) ◽  
pp. 7736-7744 ◽  
Author(s):  
Emily A. Seelen ◽  
Grace M. Massey ◽  
Robert P. Mason
Keyword(s):  
Sediment Resuspension ◽  
Particulate Mercury ◽  
Suspended Particulate

Effects of Tubificid Worms on Denitrification and Nitrification in Stream Sediment

1980 ◽  
Vol 37 (4) ◽  
pp. 656-663 ◽  
Author(s):  
Lakeram Chatarpaul ◽  
John B. Robinson ◽  
Narinder K. Kaushik
Keyword(s):  
Organic Matter ◽  
Nitrogen Cycling ◽  
Stream Sediment ◽  
Tubifex Tubifex ◽  
Gut Contents ◽  
Distilled Water ◽  
Nitrate N ◽  
Limnodrilus Hoffmeisteri ◽  
Transformation Processes ◽  
Tubificid Worms

Labeled nitrate-N in the form of K15NO3 was used to determine the effects of the tubificid oligochaetes, Tubifex tubifex and Limnodrilus hoffmeisteri, on the N transformation processes in stream sediment contained in laboratory columns. Denitrification and nitrification occurred simultaneously and were enhanced significantly in the presence of the worms. The denitrification rate over 48 d at 15 °C in the sediment that contained the worms was 90 mg N/m2∙d−1; the simultaneous rate of nitrification was 69 mg N/m2∙d−1. The corresponding rates for denitrification and nitrification in sediment without worms were 50 mg N/m2∙d−1 and 29 mg N/m2∙d−1. The rate of CO2 evolution from sediment containing worms and overlain with nitrate-N solution was about 21% greater than that of sediment with worms overlain with distilled water. It was concluded from experiments using chloride as tracer that denitrification could be enhanced by the worms at least in part as a result of accelerated movement of nitrate-N into the sediment. However, when a column of glass beads was used as substrate for worms, and with no organic matter present, the concentration of nitrate in an overlying solution declined at an appreciable rate. This suggested that denitrification occurred in or on the worms, a possibility supported by the observation that denitrifying bacteria could be isolated from both the exterior and the gut contents of the worms.Key words: tubificid worms, stream nutrient cycling, denitrification, nitrogen cycling

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