scholarly journals Evidence for biochemical limitation of population growth and reproduction of the rotifer Keratella quadrata fed with freshwater protists

2006 ◽  
Vol 28 (11) ◽  
pp. 1027-1038 ◽  
Author(s):  
Iola G. Boëchat ◽  
Rita Adrian
Keyword(s):  
Population Growth ◽  
Keratella Quadrata ◽  
Growth And Reproduction

Effects of the antibiotic tetracycline on the reproduction, growth and population growth rate of the nematode Caenorhabditis elegans

Nematology ◽  
2014 ◽  
Vol 16 (1) ◽  
pp. 19-29 ◽  
Author(s):  
Matthew Vangheel ◽  
Walter Traunspurger ◽  
Nicole Spann
Keyword(s):  
Growth Rate ◽  
Caenorhabditis Elegans ◽  
Population Growth ◽  
Surface Waters ◽  
Population Growth Rate ◽  
Significant Risk ◽  
Protein Synthesis Inhibitors ◽  
Natural Systems ◽  
C Elegans ◽  
Growth And Reproduction

The antibiotic tetracycline (TC) has been reported in natural systems, a consequence of its abundant usage in farming. TCs are protein synthesis inhibitors that are effective against bacteria but adverse effects on non-target organisms, whilst less well understood, have also been demonstrated. This study is the first investigation into the effects of this common antibiotic on the growth, reproduction and population growth rate (PGR) of the nematode Caenorhabditis elegans. All toxicological endpoints were shown to be affected negatively. TC concentrations as low as 5 mg l−1 (5 ppm) significantly reduced growth and reproduction, and even lower concentrations (3 mg l−1 or 3 ppm) significantly decreased the PGR. These levels are much higher than the TC concentrations detected in surface waters, sediments and soils (0.005-300 ppb). However, although the antibiotic might not pose a direct significant risk to nematodes in the natural environment, its use in RNAi experiments involving C. elegans may cause unwanted effects that influence interpretations of the results.

Population Growth and Reproduction in Sub-Saharan Africa: Technical Analyses of Fertility and Its Consequences.

1991 ◽  
Vol 17 (2) ◽  
pp. 351
Author(s):  
[Geoffrey McNicoll] ◽  
George T. F. Acsadi ◽  
Gwendolyn Johnson-Acsadi ◽  
Rodolfo A. Bulatao
Keyword(s):  
Population Growth ◽  
Sub Saharan Africa ◽  
Sub Saharan ◽  
Growth And Reproduction

EFFECTS OF SOME CONSTANT AND ALTERNATING TEMPERATURES ON POPULATION GROWTH OF THE PEA APHID, ACYRTHOSIPHON PISUM (HOMOPTERA: APHIDIDAE)

1973 ◽  
Vol 105 (1) ◽  
pp. 145-156 ◽  
Author(s):  
W. H. Siddiqui ◽  
C. A. Barlow ◽  
P. A. Randolph
Keyword(s):  
Population Growth ◽  
Mathematical Models ◽  
Acyrthosiphon Pisum ◽  
Pea Aphid ◽  
Average Deviation ◽  
Image Position ◽  
Faster Development ◽  
Growth And Reproduction

AbstractAlternating temperatures resulted in higher intrinsic rates of increase (rm) than constant temperatures within the range of temperature favourable for growth and reproduction of the pea aphid. This difference was due to slightly faster development and earlier attainment of maximum fecundity at alternating temperatures.Preliminary mathematical models relating rm to constant and alternating temperatures are derived. These are:for constant temperatures andfor alternating temperatures of 5°, 10°, and 15° amplitudes respectively. Average deviation between empirical and computed values is 2%. The efficacy of these models is restricted to temperatures favourable for development and reproduction of the pea aphid.

Sign in / Sign up

Export Citation Format

Share Document