Defecation Rate of Three Tubificid Oligochaetes Found in the Sediment of Toronto Harbour, Ontario

1970 ◽  
Vol 27 (11) ◽  
pp. 1971-1982 ◽  
Author(s):  
A. G. Appleby ◽  
R. O. Brinkhurst
Keyword(s):  
Relative Abundance ◽  
Weight Change ◽  
Tubifex Tubifex ◽  
Optimum Temperature ◽  
Selective Feeding ◽  
Experimental Conditions ◽  
Defecation Rate ◽  
Limnodrilus Hoffmeisteri ◽  
Period Data ◽  
Abundance And Distribution

The defecation rate of three tubificids is affected by temperature but the effect differs from species to species. Information on defecation rate and weight change at each experimental temperature suggests an optimum temperature range of 14 C for Peloscolex multisetosus, 18 C for Tubifex tubifex, and greater than 20 C for Limnodrilus hoffmeisteri. Downward trends of defecation rate with time were recorded for P. multisetosus, but these were probably due to lowered activity prior to the observed mortality. Upward trends in defecation rate with time in L. hoffmeisteri may indicate continuing acclimation to experimental conditions beyond their 10- to 14-day duration, or a need to process increasing amounts of less nutritious mud because of selective feeding on the richer fractions at the beginning of the assay period. Data on the relative abundance and distribution of species in Toronto Harbour is used to estimate defecation rates of the tubificid populations in the field.

scholarly journals RELATIVE ABUNDANCE AND DISTRIBUTION OF THE TRUE SPIDER FAMILIES IN ASSUIT GOVERNORATE

2012 ◽  
Vol 3 (2) ◽  
pp. 81-89
Author(s):  
A. Metwaly ◽  
M. Abd El-Kader ◽  
S. Montaser ◽  
M. Ahmed ◽  
H. Qurany
Keyword(s):  
Relative Abundance ◽  
Abundance And Distribution

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.

scholarly journals A Preliminary Survey of Amphibians and Reptiles in around Gulbarga University Campus, Karnataka, India

2014 ◽  
Vol 27 ◽  
pp. 67-71
Author(s):  
Murali Jadesh ◽  
Parshuram Kamble ◽  
K. Manjunath ◽  
K. Ravikiran ◽  
Sharanappa Padashetty
Keyword(s):  
Species Composition ◽  
Relative Abundance ◽  
Survey Methods ◽  
Preliminary Survey ◽  
University Campus ◽  
Visual Estimation ◽  
Abundance And Distribution

The study involves survey of amphibian and reptile in and around Gulbarga University Campus. Survey was conducted from Jan 2012 to March 2013. The survey methods involved careful visual estimation of amphibians and reptilian in all the possible habitats present in the study area. The objective of the study included evaluate of species composition, relative abundance and distribution of amphibian and reptile of the chosen area. During survey a total of 16 species of herpetofauna identified belonging to 12 families, which includes 9 species of snakes, 4 species amphibians, 3 species of lizards

Historical Changes in Large River Fish Assemblages of the Americas

2005 ◽  
Keyword(s):  
Relative Abundance ◽  
Mississippi River ◽  
Largemouth Bass ◽  
Fish Assemblage ◽  
Fish Assemblages ◽  
Micropterus Salmoides ◽  
Lepomis Macrochirus ◽  
Large River ◽  
Frequency Of Occurrence ◽  
Abundance And Distribution

<em>Abstract.</em>—An investigation of historical fisheries information for pools 4–13 of the upper Mississippi River (UMR) was conducted to 1) determine the pre-1938 relative abundance and distribution of bluegill <em>Lepomis macrochirus </em>and largemouth bass <em>Micropterus salmoides, </em>2) determine the composition and relative abundance of the preimpoundment fish assemblage, and 3) determine if a shift in frequency of occurrence and relative abundance has occurred due to impoundment.

scholarly journals Relative Abundance and Distribution of Mariana Swiftlets (Aves: Apodidae) in the Northern Mariana Islands1

2008 ◽  
Vol 62 (2) ◽  
pp. 233-246 ◽  
Author(s):  
Justine B. Cruz ◽  
Shelly R. Kremer ◽  
Gayle Martin ◽  
Laura L. Williams ◽  
Vicente A. Camacho
Keyword(s):  
Relative Abundance ◽  
Abundance And Distribution

scholarly journals Herpes Simplex Virus Infection Stabilizes Cellular IEX-1 mRNA

2005 ◽  
Vol 79 (7) ◽  
pp. 4090-4098 ◽  
Author(s):  
Wei-Li Hsu ◽  
Holly A. Saffran ◽  
James R. Smiley
Keyword(s):  
Herpes Simplex Virus ◽  
Herpes Simplex ◽  
Relative Abundance ◽  
Dependent Manner ◽  
Experimental Conditions ◽  
Viral Mrnas ◽  
Necrosis Factor Alpha ◽  
Translational Initiation ◽  
Simplex Virus ◽  
Hsv 1

ABSTRACT Herpes simplex virus (HSV) virion host shutoff protein (vhs) destabilizes cellular and viral mRNAs. Previous work from several laboratories has indicated that vhs accelerates the turnover of most host mRNAs and provided evidence that at least some of these are degraded via endonucleolytic cleavage near regions of translational initiation followed by 5′→3′ decay. In contrast, several recent reports have argued that vhs is selective, preferentially targeting a subset of mRNAs including some that bear AU-rich instability elements (such as the stress-inducible IEX-1 mRNA). These reports concluded that vhs triggers deadenylation, 3′ cleavage, and 3′→5′ decay of IEX-1 mRNA. However, we report here that HSV infection does not increase the rate of degradation of IEX-1 mRNA; rather, actinomycin D chase assays indicate that the transcript is stabilized relative to that in uninfected cells in both the presence and absence of functional vhs. Moreover, deadenylated but otherwise intact IEX-1 mRNA was readily detected in uninfected cells cultured under our experimental conditions, and its relative abundance did not increase following HSV type 1 (HSV-1) infection. We confirm that HSV infection increases the relative abundance of a discrete 0.75-kb 3′-truncated IEX-1 RNA species in a vhs-dependent manner. This truncated transcript was also detected (albeit at lower levels) in cells infected with vhs mutants and in uninfected cells, where it increased in abundance in response to tumor necrosis factor alpha, cycloheximide, and puromycin. We conclude that IEX-1 mRNA is not preferentially degraded during HSV-1 infection and that HSV-1 instead inhibits the normal turnover of this mRNA.

Identification, abundance, and origin of moss, liverwort, and algal contaminants in greenhouses of containerized forest nurseries

1981 ◽  
Vol 11 (2) ◽  
pp. 357-361 ◽  
Author(s):  
Richard L. M. Ross ◽  
George S. Puritch
Keyword(s):  
British Columbia ◽  
Relative Abundance ◽  
Water Samples ◽  
Algal Species ◽  
Air Samples ◽  
Forest Nurseries ◽  
Soil Mix ◽  
Abundance And Distribution

Five containerized forest nurseries in British Columbia were surveyed for cryptogam (moss, liverwort, and algal) contamination. Fourteen cryptogam species (five bryophyte and nine algal species) were identified from contaminated styroblock containers. No cryptogams were cultured from the peat and soil mix samples and no mosses or liverworts were detected in the water samples. Algae were found in water samples of two of the five nurseries, but only one of these had species similar to those contaminating the styroblocks. Air samples contained moss, liverwort, and six of the nine algal contaminant species. The relative abundance and distribution of cryptogams at each nursery is given and data are presented which indicate an airborne mode of contamination. The results are discussed with respect to the nature of the contamination and possible control of cryptogam pests in greenhouses of containerized forest nurseries.

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