PREDATORS OF AEDES ATROPALPUS (COQ) (DIPTERA: CULICIDAE) AND OF OTHER MOSQUITOES BREEDING IN ROCK POOLS IN ONTARIO

1965 ◽  
Vol 43 (1) ◽  
pp. 155-159 ◽  
Author(s):  
H. G. James
Keyword(s):  
Aquatic Insects ◽  
Rock Pools ◽  
High Radiation ◽  
Radioactive Phosphorus ◽  
Arthropod Predators ◽  
Aedes Atropalpus

Predators of Aedes atropalpus (Coq.) and of other rockpool mosquitoes were investigated at Cordova Mines, Ontario, by tagging larvae with radioactive phosphorus, P32. High radiation counts showed that six species of dytiscids, two of Hemiptera, a leech, and a minnow were predators of A. atropalpus. The dytiscid Laccophilus maculosus Germ. exceeded other arthropod predators in numbers and in degrees of radioactivity. Hydra oligactis Pallas killed but did not ingest the tagged larvae. Other evidence suggested that H. oligactis inhibits breeding by capturing young larvae and paralyzing later stages. Five species of aquatic insects were predacious on larvae of Anopheles and Culex.

Population Growth Rates of Aedes atropalpus (Diptera: Culicidae) Are Depressed at Lower Temperatures Where Aedes japonicus japonicus (Diptera: Culicidae) Are Naturally Abundant in Rock Pools

2020 ◽  
Author(s):  
Corey A Day ◽  
Eleanor G Armstrong ◽  
Brian D Byrd
Keyword(s):  
Growth Rate ◽  
Population Growth ◽  
Population Growth Rate ◽  
Invasion Biology ◽  
The United States ◽  
Rock Pools ◽  
Temperature Range ◽  
Natural Rock ◽  
Aedes Atropalpus ◽  
Middle Temperature

Abstract Recent studies report extensive reductions in the abundance of the North American rock pool mosquito, Aedes atropalpus (Diptera: Culicidae), following the invasion of Ae. japonicus japonicus in the United States. Although developmental temperature is recognized as an important component of the invasion biology of Ae. j. japonicus, its impacts on the population growth and fitness of Ae. atropalpus remain largely undefined. In this study we reared Ae. atropalpus larvae at three temperature ranges reflecting ecologically important temperatures in natural rock pools: a low temperature range (mean: 19°C) where Ae. j. japonicus is common and Ae. atropalpus is often rare, a middle temperature range (mean: 25°C) where both species are naturally found in similar relative abundances, and a higher temperature range (mean: 31°C) where Ae. atropalpus is the dominant species. We measured survival, development time, wing length, and fecundity to calculate a finite population growth rate at each temperature. Our results indicate that Ae. atropalpus population growth suffers in colder rock pools, which informs the perceived displacement of the species in temperate habitats. The population growth rate was highest in the middle temperature range, but not significantly higher than in the highest temperature range used in this study. The developmental success of Ae. atropalpus at the intermediate temperature range suggests that competition with Ae. j. japonicus in rock pools within that range may significantly impact natural Ae. atropalpus populations.

scholarly journals Larval competition between Aedes japonicus and Aedes atropalpus (Diptera: Culicidae) in simulated rock pools

2008 ◽  
Vol 33 (2) ◽  
pp. 238-246 ◽  
Author(s):  
Jennifer S. Armistead ◽  
Naoya Nishimura ◽  
Richard L. Escher ◽  
L. Philip Lounibos
Keyword(s):  
Rock Pools ◽  
Larval Competition ◽  
Aedes Japonicus ◽  
Aedes Atropalpus

SOME PREDATORS OF AEDES STIMULANS (WALK.) AND AEDES TRICHURUS (DYAR) (DIPTERA: CULICIDAE) IN WOODLAND POOLS

1961 ◽  
Vol 39 (4) ◽  
pp. 533-540 ◽  
Author(s):  
H. G. James
Keyword(s):  
Aquatic Insects ◽  
Pond Snail ◽  
Mosquito Larvae ◽  
Water Beetles ◽  
Additional Species ◽  
Radioactive Phosphorus ◽  
The Times

The predators of first- and second-instar larvae of Aedes stimulans and A. trichurus in temporary woodland pools near Belleville, Ontario, were determined mainly by use of mosquito larvae tagged with radioactive phosphorus, but in part from the presence of aedine remains found in the digestive tracts of dissected beetles. Of 428 pond animals collected from the test pools 122 were found to be radioactive above background. Among the 17 species of aquatic insects and other animals that fed on mosquito larvae, 8 species of Dytiscidae, 1 of Hydrophilidae, 1 of Limnephilidae, and 1 pond snail are regarded as important predators. Three additional species of water beetles were identified as predators from aedine remains in their digestive tracts. The abundance of the predators, and the times of occurrence of six species in relation to mosquito development, are discussed.

Projected Structure of the Surface Protein of Sulfolobus Spec. B12 Determined to a Resolution of 1.0 NM by Cryo-Electronmicroscopy

1990 ◽  
Vol 48 (1) ◽  
pp. 102-103
Author(s):  
G. Lembcke ◽  
F. Zemlin
Keyword(s):  
Low Dose ◽  
Maximum Dose ◽  
Three Dimensional ◽  
Surface Protein ◽  
Protein S ◽  
Radiation Sensitivity ◽  
Specimen Preparation ◽  
Molecular Architecture ◽  
High Radiation ◽  
Fritz Haber

The thermoacidophilic archaebacterium Sulfolobus spec. B12 , which is closely related to Sulfolobus solfataricus , possesses a regularly arrayed surface protein (S-layer), which is linked to the plasma membrane via spacer elements spanning a distinct interspace of approximately 18 nm. The S-layer has p3-Symmetry and a lattice constant of 21 nm; three-dimensional reconstructions of negatively stained fragments yield a layer thickness of approximately 6-7 nm.For analysing the molecular architecture of Sulfolobus surface protein in greater detail we use aurothioglucose(ATG)-embedding for specimen preparation. Like glucose, ATG, is supposed to mimic the effect of water, but has the advantage of being less volatile. ATG has advantages over glucose when working with specimens composed exclusively of protein because of its higher density of 2.92 g cm-3. Because of its high radiation sensitivity electromicrographs has to be recorded under strict low-dose conditions. We have recorded electromicrographs with a liquid helium-cooled superconducting electron microscope (the socalled SULEIKA at the Fritz-Haber-lnstitut) with a specimen temperature of 4.5 K and with a maximum dose of 2000 e nm-2 avoiding any pre-irradiation of the specimen.

PET/CT

2005 ◽  
Vol 44 (S 01) ◽  
pp. S51-S57 ◽  
Author(s):  
T. Beyer ◽  
G. Brix
Keyword(s):  
Diagnostic Accuracy ◽  
Radiation Exposure ◽  
Dose Reduction ◽  
Pet Imaging ◽  
Clinical Studies ◽  
Review Article ◽  
Whole Body ◽  
High Radiation ◽  
Radiation Burden ◽  
Pet Ct

Summary:Clinical studies demonstrate a gain in diagnostic accuracy by employing combined PET/CT instead of separate CT and PET imaging. However, whole-body PET/CT examinations result in a comparatively high radiation burden to patients and thus require a proper justification and optimization to avoid repeated exposure or over-exposure of patients. This review article summarizes relevant data concerning radiation exposure of patients resulting from the different components of a combined PET/CT examination and presents different imaging strategies that can help to balance the diagnostic needs and the radiation protection requirements. In addition various dose reduction measures are discussed, some of which can be adopted from CT practice, while others mandate modifications to the existing hardand software of PET/CT systems.

DETERMINATION OF THYROTROPHIN BY MEANS OF RADIOACTIVE PHOSPHORUS

1949 ◽  
Vol 3 (4) ◽  
pp. 331-341 ◽  
Author(s):  
ULF BORELL ◽  
HJALMAR HOLMGREN
Keyword(s):  
Radioactive Phosphorus
Sign in / Sign up

Export Citation Format

Share Document