Variation in the preoperculomandibular canal of the johnny darter, Etheostoma nigrum, with associated zoogeographical considerations

1992 ◽  
Vol 70 (12) ◽  
pp. 2315-2321
Author(s):  
François Chapleau ◽  
J. Andrew Cooper
Keyword(s):  
New York ◽  
South Carolina ◽  
Mississippi River ◽  
Total Sample ◽  
Ohio River ◽  
Northern Ontario ◽  
Upper Peninsula ◽  
Ottawa River ◽  
Johnny Darter ◽  
River Drainages

A total of 1267 specimens (from 87 stations) of the johnny darter, Etheostoma nigrum, were studied to examine the geographic variation in the numbers of pores on the preoperculomandibular canal. The pore count is bimodal for the total sample. These modes correspond to distinct geographic regions. Fishes from northern Ontario (west and north of Lake Nipigon), Manitoba, Saskatchewan, Minnesota, Wisconsin, Iowa, and the Upper Peninsula of Michigan usually have 7 or fewer pores (mode = 6). Populations from northern Ontario (east and south of Lake Nipigon), southern Ontario, Quebec, Illinois, Indiana, Kentucky, Tennessee, Maryland, Ohio, New York, Pennsylvania, West Virginia, Virginia, North Carolina, South Carolina, and the Lower Peninsula of Michigan have 8 or more pores (mode = 9). The differentiation between morphs predates their present distribution and the morphs probably occupied distinct geographic areas within the Mississippi refugium during the last glaciation. Etheostoma nigrum dispersed north, following two postglacial routes: (i) via the Mississippi River to Lake Agassiz (12 800 years BP) then eastward to the Hudson Bay and James Bay drainages via Lake Barlow–Ojibway (9500 years BP), and (ii) via a northeastern spread from the Great Lakes and Ohio River drainages to the St. Lawrence River and Ottawa River drainages (12 000 years BP).

Paddlefish Management, Propagation, and Conservation in the 21st Century

2009 ◽  
Keyword(s):  
Mississippi River ◽  
Entire Range ◽  
Population Characteristics ◽  
Ohio River ◽  
River Drainage ◽  
Temporal And Spatial Variability ◽  
Class Strength ◽  
Catch Rates ◽  
Future Work ◽  
River Drainages

<em>Abstract.</em>—The paddlefish <em>Polyodon spathula </em>occurs in the Mississippi and Ohio River drainages, as well as in several Gulf of Mexico tributaries. Populations throughout the Mississippi and Ohio River drainages have been relatively well studied, often relative to their exploitation. In contrast, the genetically distinct Alabama River drainage population has been studied relatively little. Here, we use both historical work and our own research conducted since 1992 to summarize population characteristics of the Alabama River paddlefish population and compare them to other stocks. We also examine the influence of flow on catch rates in the upstream reaches of this drainage during 1998–2003 and suggest where future work is needed to conserve this unique stock. Spawning temperatures and age at maturity were similar between Alabama and Mississippi river populations, and flow and adult paddlefi sh catch rates were positively related, suggesting that year-class strength may be related to flow, as has been shown for other populations. However, Alabama River paddlefish can spawn more frequently, grow faster, and have a much shorter life span. Previous work suggested that paddlefish throughout the Alabama River drainage were genetically distinct from other stocks, and recent work suggests that differences may exist between fish from the upper Alabama River and lower Alabama River. We argue that additional work with Alabama River drainage populations should focus on three areas: (1) detailed genetic work to identify differences among areas within the Alabama River drainage, as well as with other drainages; (2) quantify temporal and spatial variability in population characteristics of paddlefish throughout the entire range of the Alabama River drainage; and (3) quantify year-class strength and correlate it with flow/discharge to eventually predict recruitment and year-class strength in this unique stock.

Crystallaria cincotta, a new species of darter (Teleostei: Percidae) from the Elk River of the Ohio River drainage, West Virginia

Zootaxa ◽  
2008 ◽  
Vol 1680 (1) ◽  
pp. 62 ◽  
Author(s):  
STUART A. WELSH ◽  
ROBERT M. WOOD
Keyword(s):  
New Species ◽  
West Virginia ◽  
Mississippi River ◽  
Gulf Coast ◽  
Ohio River ◽  
Upper Mississippi River ◽  
Elk River ◽  
Lower Mississippi River ◽  
River Drainages ◽  
A New Species

A new species of percid, Crystallaria cincotta, is described from the Cumberland, Elk, Green, and Muskingum river drainages of the Ohio River basin, USA. It differs from populations of Crystallaria asprella of the Gulf Coast, lower Mississippi River, middle Mississippi River, upper Mississippi River, and Wabash River drainages by having a reduced number of cheek scale rows restricted to the post-orbital region, a falcate margin on the pelvic fins, a preorbital blotch distinctly separate from the anterior orbital rim, and a wide mouth gape. The Elk River population is also divergent genetically from populations of the Gulf Coast, lower Mississippi River, and upper Mississippi River drainages. Crystallaria cincotta, discovered in the Elk River of the Ohio River drainage in 1980, is a rare species with the only extant population represented by 12 individuals collected from 1980–2005 from the lower 36 km section of the Elk River, West Virginia.

Early Cultural Horizons in the Southeastern United States

1950 ◽  
Vol 15 (4Part1) ◽  
pp. 273-288
Author(s):  
Carl F. Miller
Keyword(s):  
United States ◽  
North Carolina ◽  
South Carolina ◽  
Mississippi River ◽  
The United States ◽  
Ohio River ◽  
Cultural Conditions ◽  
Northern Portion ◽  
Southern Half ◽  
Eastern Half

Since Haag's article “Early Horizons in the Southeast” appeared some time ago, considerable data have accumulated which further delimit the southeastern archaeological area. Instead of covering the area south of the Ohio River and east of the Mississippi River, as noted by Haag, it more nearly approximates that region covered by the eastern half of the state of Tennessee; the southern half of North Carolina; all of Mississippi, Alabama, Georgia, South Carolina, and Florida; and the eastern portion of Louisiana—most of which lie in the Coastal Plain and in the northern portion of the Piedmont section. Climatic as well as physiographic and cultural conditions were determinants of the type and kind of aboriginal sites found in this geographical section of the United States.

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.

scholarly journals MOLECULAR ZOOGEOGRAPHY OF FRESHWATER FISHES IN THE SOUTHEASTERN UNITED STATES

Genetics ◽  
1986 ◽  
Vol 113 (4) ◽  
pp. 939-965
Author(s):  
Eldredge Bermingham ◽  
John C Avise
Keyword(s):  
South Carolina ◽  
Southeastern United States ◽  
Population Subdivision ◽  
Positive Role ◽  
Level Change ◽  
Historical Factors ◽  
Length Polymorphisms ◽  
Amia Calva ◽  
River Drainages ◽  
Distributional Limits

ABSTRACT Restriction fragment length polymorphisms in mitochondrial DNA (mtDNA) were used to reconstruct evolutionary relationships of conspecific populations in four species of freshwater fish—Amia calva, Lepomis punctatus, L. gulosus, and L. microlophus. A suite of 14-17 endonucleases was employed to assay mtDNAs from 305 specimens collected from 14 river drainages extending from South Carolina to Louisiana. Extensive mtDNA polymorphism was observed within each assayed species. In both phenograms and Wagner parsimony networks, mtDNA clones that were closely related genetically were usually geographically contiguous. Within each species, major mtDNA phylogenetic breaks also distinguished populations from separate geographic regions, demonstrating that dispersal and gene flow have not been sufficient to override geographic influences on population subdivision.—Importantly, there were strong patterns of congruence across species in the geographic placements of the mtDNA phylogenetic breaks. Three major boundary regions were characterized by concentrations of phylogenetic discontinuities, and these zones agree well with previously described zoogeographic boundaries identified by a different kind of data base—distributional limits of species—suggesting that a common set of historical factors may account for both phenomena. Repeated episodes of eustatic sea level change along a relatively static continental morphology are the likely causes of several patterns of drainage isolation and coalescence, and these are discussed in relation to the genetic data.—Overall, results exemplify the positive role that intraspecific genetic analyses may play in historical zoogeographic reconstruction. They also point out the potential inadequacies of any interpretations of population genetic structure that fail to consider the influences of history in shaping that structure.

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