335 research outputs found
Silversides of the genus Labidesthes (Atheriniformes: Atherinopsidae)
No full textWerneke, David C., Armbruster, Jonathan W. (2015): Silversides of the genus Labidesthes (Atheriniformes: Atherinopsidae). Zootaxa 4032 (5): 535-550, DOI: 10.11646/zootaxa.4032.5.
FIGURE 11 in Silversides of the genus Labidesthes (Atheriniformes: Atherinopsidae)
No full textFIGURE 11. Box plots of abdominal/thoracic length in Labidesthes species (p<0.00001).Published as part of Werneke, David C. & Armbruster, Jonathan W., 2015, Silversides of the genus Labidesthes (Atheriniformes: Atherinopsidae), pp. 535-550 in Zootaxa 4032 (5) on page 547, DOI: 10.11646/zootaxa.4032.5.4, http://zenodo.org/record/23628
Assessing Changes in Permethrin Toxicity to Juvenile Inland Silversides (Menidia beryllina) Under Different Temperature Scenarios
No full textAquatic systems are impacted by temperature fluctuations which can alter the toxicity of pesticides. Increased temperatures have elevated pest activity, resulting in an escalation of pesticide use. One such pesticide class, pyrethroids, has replaced the use of several banned pesticides due to its low mammalian toxicity. The impacts of increased temperatures on the toxicity of a pyrethroid, permethrin, to fish is not yet known. In the current study, juvenile inland silversides (Menidia beryllina) were exposed to permethrin at three temperatures: 10°C, 20°C, and 30°C. Permethrin toxicity was significantly different among each temperature and showed an inverse relationship with temperature. As temperatures fluctuate, fishes experience a change in respiration, biotransformation, and elimination rates, which can drive the noted difference in toxicity. Based on these findings, toxicity can be temperature dependent and should be considered when assessing risk of exposure to pesticides in aquatic systems
It's a family matter: Molecular phylogenetics of Atheriniformes and the polyphyly of the surf silversides (Family: Notocheiridae)
No full texta b s t r a c t Phylogenetic relationships among families of Atheriniformes have long been problematic. The affinities of one of the most enigmatic lineages, surf silversides (Notocheiridae), have proven particularly elusive due to this taxon's unique morphology and rarity in museum collections. In this study, we use mitochondrial and nuclear sequence data to generate a phylogeny for seven of the eight families of Atheriniformes. Our results reveal that four families within Atheriniformes (Atherinopsidae, Notocheiridae, Atherinidae, Melanotaeniidae) are not monophyletic. Most notably, Notocheiridae is polyphyletic, with Notocheirus hubbsi nested within New World silversides (Atherinopsidae), while members of Iso are sister to all other Old World Atheriniforms. These data suggest that the unique morphology of Notocheirus and Iso is a result of adaptive convergent evolution to the high-energy surf habitat where these species live
Supplemental Material2 - Supplemental material for Fluid management and deresuscitation practices: A survey of critical care physicians
No full textSupplemental material, Supplemental Material2 for Fluid management and deresuscitation practices: A survey of critical care physicians by Jonathan A Silversides, Daniel F McAuley, Bronagh Blackwood, Eddy Fan, Andrew J Ferguson and John C Marshall in Journal of the Intensive Care Society</p
Supplemental Material1 - Supplemental material for Fluid management and deresuscitation practices: A survey of critical care physicians
No full textSupplemental material, Supplemental Material1 for Fluid management and deresuscitation practices: A survey of critical care physicians by Jonathan A Silversides, Daniel F McAuley, Bronagh Blackwood, Eddy Fan, Andrew J Ferguson and John C Marshall in Journal of the Intensive Care Society</p
Influence of salinity and organic carbon on the chronic toxicity of silver to mysids (Americamysis bahia) and silversides (Menidia beryllina)
No full textTests were conducted with mysids (Americamysis bahia) and silversides (Menidia beryllina) to evaluate the influence of salinity and organic carbon on the chronic toxicity of silver. During 7- and 28-d tests conducted at 10, 20, and 30 parts per thousand salinity, higher concentrations of dissolved silver generally were required to cause a chronic effect as the salinity of the seawater was increased. The 28-d mysid and silverside 20%-effective concentration values (expressed as dissolved silver) ranged from 3.9 to 60 and from 38 to 170 mu g/L, respectively, over the salinity range. This pattern was not observed when the same test results were evaluated against the concentrations of free ionic silver (measured directly during toxicity tests), as predicted by the free-ion activity model. Increasing the concentration of dissolved organic carbon from I mg/L to the apparent maximum achievable concentration of 6 mg/L in seawater caused a slight decrease in chronic toxicity to silversides but had no effect on the chronic toxicity to mysids. The possible additive toxicity of silver in both food and water also was investigated. Even at the maximum achievable foodborne concentration, the chronic toxicity of silver added to the water was not affected when silver was also added to the food, based on the most sensitive endpoint (growth). However, although fecundity was unaffected at all five tested concentrations during the test with silver in water only, it was significantly reduced at the two highest waterborne silver concentrations (12 and 24 mu g/L) during the test with silver dosed into food and wate
Multiple regression results for environmental predictors (MeHg in sediments, water column dissolved aqueous, and particulates) of biotic MeHg tissue concentrations.
No full text<p>Full and reduced models for (A) killifish; (B) Atlantic silversides; and (C) worms.</p
The record of daily growth in otoliths of Atlantic silversides, Menidia menidia, from field and laboratory
No full textOtoliths were removed from field‐collected silversides of age less than 3 months. Otolith diameter was highly correlated with total length of the fish. Daily growth ring counts for this species are known to be a function of age rather than size, so widths for the daily growth rings provide a record of daily increases in length of the fish. Measurement of ring widths showed that weekly specific growth rate was greater than 70% at age 1 week, but declined to about 30% at age 1 month and about 15% at age 2 months. A laboratory experiment in which temperature was changed on a weekly basis demonstrated that environmental variables can affect the width of rings. Nevertheless, the growth rate of field‐collected fish, as calculated from otolith ring widths, was more highly correlated with size of fish, as measured by otolith radius, than with the environmental variables of temperature, salinity and plankton abundance. Back‐calculation of growth rates from otolith ring widths of five fish collected at the end of the growing season yielded the same age‐growth curves as were obtained from 203 fish collected biweekly during the season. Copyright © 1987, Wiley Blackwell. All rights reserve
Étude du gène SRY chez les espèces bovine et le porcine
No full textMémoire numérisé par la Direction des bibliothèques de l'Université de Montréal
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