The dead of winter: size-dependent variation and genetic differences in seasonal mortality among Atlantic silverside (Atherinidae: Menidia menidia) from different latitudes

1998 ◽  
Vol 55 (5) ◽  
pp. 1149-1157 ◽  
Author(s):  
Eric T Schultz ◽  
David O Conover ◽  
Amir Ehtisham
Keyword(s):  
New York ◽  
South Carolina ◽  
Nova Scotia ◽  
Low Temperatures ◽  
Winter Mortality ◽  
Small Fish ◽  
Energy Reserves ◽  
Menidia Menidia ◽  
Atlantic Silverside ◽  
Varied Size

Genetic differences among populations of Atlantic silverside (Menidia menidia) are hypothesized to be evolutionary responses to intense, size-selective winter mortality at high latitudes. Three experiments were conducted to test features of winter mortality. In the first experiment, we varied size and whether food was provided or withheld; temperatures were permitted to follow ambient (New York) wintertime fluctuations. Mortality and depletion of energy reserves were more rapid in the units receiving no food. Small fish died before larger fish in these units, but not in the units receiving food. Energy depletion of fish in the no-food treatment resembled that of fish in the wild. In the second experiment, we varied size and population of origin, representing high-latitude (Nova Scotia), midlatitude (New York), and low-latitude (South Carolina) populations. These fish were provided food and showed minimal depletion of energy reserves, but mortality rates were high when water temperatures were low. Mortality did not vary with size in New York and South Carolina fish, but was highest in intermediate-size fish from Nova Scotia. There was a pronounced population difference in survival rate (Nova Scotia > New York > South Carolina). In the third experiment, food was withheld and extreme low temperatures were moderated. Energy depletion was rapid and small fish died before large fish. We conclude that populations in seasonal environments are likely to be subject to size-selective winter mortality when energy reserves are depleted and that juvenile growth rates have evolved in response to this selection pressure. In addition, high-latitude populations have evolved greater tolerance to other winter stresses associated with low temperatures.

Darwinian fishery science: lessons from the Atlantic silverside (Menidia menidia)

2005 ◽  
Vol 62 (4) ◽  
pp. 730-737 ◽  
Author(s):  
David O Conover ◽  
Stephen A Arnott ◽  
Matthew R Walsh ◽  
Stephan B Munch
Keyword(s):  
Life History ◽  
Theory And Practice ◽  
Winter Mortality ◽  
Menidia Menidia ◽  
Adaptive Genetic Variation ◽  
Atlantic Silverside ◽  
Fishery Science ◽  
Evolutionary Changes ◽  
In The Wild ◽  
Contrary Evidence

The potential of fishing mortality to cause rapid evolutionary changes in life history has received relatively little attention. By focusing only on ecological responses, standard fisheries theory and practice implicitly assume either that genetic influences on life history in the wild are negligible or that natural selection and adaptation is a slow process that can be effectively ignored. Lack of contrary evidence has allowed these assumptions to persist. Drawing upon >25 years of research on the Atlantic silverside (Menidia menidia), we show that adaptive genetic variation in many traits is finely tuned to natural variation in climate. Much of this variation is caused by a gradient in size-selective winter mortality and involves two- to threefold changes in physiological traits that influence population productivity. Many other species are now known to display similar patterns. Harvest experiments show that these traits can evolve rapidly in response to size-selective fishing. Hence, the pool of genotypes that code for life history traits is a highly dynamic property of populations. We argue that the lessons from Menidia are applicable to many exploited species where similar observations would be difficult to obtain and advocate greater use of species models to address fundamental questions in fishery science.

Use of the AMA Guides in State Workers' Compensation Systems: 2009 Update

2009 ◽  
Vol 14 (2) ◽  
pp. 13-16
Author(s):  
Christopher R. Brigham ◽  
Jenny Walker
Keyword(s):  
New York ◽  
North Carolina ◽  
South Carolina ◽  
South Dakota ◽  
Rhode Island ◽  
Workers Compensation ◽  
Fourth Edition ◽  
Sixth Edition ◽  
Specific Guideline ◽  
Compensation Systems

Abstract The AMAGuides to the Evaluation of Permanent Impairment (AMA Guides) is the most widely used basis for determining impairment and is used in state workers’ compensation systems, federal systems, automobile casualty, and personal injury, as well as by the majority of state workers’ compensation jurisdictions. Two tables summarize the edition of the AMA Guides used and provide information by state. The fifth edition (2000) is the most commonly used edition: California, Delaware, Georgia, Hawaii, Kentucky, New Hampshire, Idaho, Indiana, Iowa, Kentucky, Massachusetts, Nevada, North Dakota, Ohio, Vermont, and Washington. Eleven states use the sixth edition (2007): Alaska, Arizona, Louisiana, Mississippi, Montana, New Mexico, Oklahoma, Pennsylvania, Rhode Island, Tennessee, and Wyoming. Eight states still commonly make use of the fourth edition (1993): Alabama, Arkansas, Kansas, Maine, Maryland, South Dakota, Texas, and West Virginia. Two states use the Third Edition, Revised (1990): Colorado and Oregon. Connecticut does not stipulate which edition of the AMA Guides to use. Six states use their own state specific guidelines (Florida, Illinois, Minnesota, New York, North Carolina, and Wisconsin), and six states do not specify a specific guideline (Michigan, Missouri, Nebraska, New Jersey, South Carolina, and Virginia). Statutes may or may not specify which edition of the AMA Guides to use. Some states use their own guidelines for specific problems and use the Guides for other issues.

Neither Tramp Nor Hobo: Images of Unemployment in the Art of the Ashcan School

Prospects ◽  
2005 ◽  
Vol 30 ◽  
pp. 433-450
Author(s):  
Alexis L. Boylan
Keyword(s):  
New York ◽  
New York City ◽  
South Carolina ◽  
York City ◽  
New York Times ◽  
Visual Image ◽  
City Life ◽  
Ashcan School ◽  
Mind And Body ◽  
National Reputation

This short notice, entitled “When a ‘Hobo’ Works,” which appeared in the New York Times, July 13, 1912, might seem overwrought to contemporary readers in its definitive nature. The need to delineate work and nonwork, however, was quite serious business for Americans in the first decades of the 20th century. During this period, as evidenced in newspaper and journal articles, legislation, and popular culture, there was growing apprehension about the perceived differences and slippage among the ideas of the tramp, the hobo, the vagrant, the unemployed worker, and the worker. Most of this conversation was directed toward defining work and nonwork for men — specifically for white men. Tramping came to be viewed as an affliction of both mind and body, with writers, politicians, and reformers seeking to define the tramp and then theorizing how to put these newly codified bodies to work.Some of the most complex images of joblessness from this period were produced by the Ashcan school of artists, who frequently portrayed jobless men in their paintings and drawings. The Ashcan school, a group of six realist painters who lived and worked in New York City from 1900 to the First World War, established a national reputation as radicals rebelling against what they argued was a conservative artistic community woefully out of touch with modern American life. Ashcan artists depicted what they claimed to be the realities of the city around them — busy streets, shopgirls, ethnic communities, construction workers, and prostitutes, as well as tramps. John Sloan's The Coffee Line, 1905 (Figure 1), is typical of the kinds of images that Ashcan artists produced. The scene is a snowy winter's night in New York with a band of men in line to get a free cup of coffee. Jobless men are the stars here; unwitting leads in Sloan's slice of New York City life. The painting did much to communicate nationally a visual image of the tramp in New York City; it won honorable mention in 1905 at the Carnegie Institute International Exposition and was then exhibited in Chicago; Spartanburg, South Carolina; Dallas; and Seattle.

scholarly journals You Better Repeat It: Complex CO2 × Temperature Effects in Atlantic Silverside Offspring Revealed by Serial Experimentation

Diversity ◽  
2018 ◽  
Vol 10 (3) ◽  
pp. 69 ◽  
Author(s):  
Christopher Murray ◽  
Hannes Baumann
Keyword(s):  
Early Life ◽  
Larval Growth ◽  
Menidia Menidia ◽  
Embryo Survival ◽  
Single Experiment ◽  
Growth And Survival ◽  
Atlantic Silverside ◽  
Co2 Effects ◽  
Experimental Approaches ◽  
Temperature Interactions

Concurrent ocean warming and acidification demand experimental approaches that assess biological sensitivities to combined effects of these potential stressors. Here, we summarize five CO2 × temperature experiments on wild Atlantic silverside, Menidia menidia, offspring that were reared under factorial combinations of CO2 (nominal: 400, 2200, 4000, and 6000 µatm) and temperature (17, 20, 24, and 28 °C) to quantify the temperature-dependence of CO2 effects in early life growth and survival. Across experiments and temperature treatments, we found few significant CO2 effects on response traits. Survival effects were limited to a single experiment, where elevated CO2 exposure reduced embryo survival at 17 and 24 °C. Hatch length displayed CO2 × temperature interactions due largely to reduced hatch size at 24 °C in one experiment but increased length at 28 °C in another. We found no overall influence of CO2 on larval growth or survival to 9, 10, 15 and 13–22 days post-hatch, at 28, 24, 20, and 17 °C, respectively. Importantly, exposure to cooler (17 °C) and warmer (28 °C) than optimal rearing temperatures (24 °C) in this species did not appear to increase CO2 sensitivity. Repeated experimentation documented substantial inter- and intra-experiment variability, highlighting the need for experimental replication to more robustly constrain inherently variable responses. Taken together, these results demonstrate that the early life stages of this ecologically important forage fish appear largely tolerate to even extreme levels of CO2 across a broad thermal regime.

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