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Comparative Age And Growth Of Two Darters, Percina Peltata (Stauffer) And Percina Notogramma (Raney And Hubbs), In Virginia, Garnett William Link

Master's Theses

Two closely related species or darters, Percina peltata and Percina notogramma, occur sympatrically in Virginia. An analysis or the number of scale annuli and standard length measurements on 447 peltata and 195 notogrannna revealed four year classes in both species, with very few individuals surviving to III-year class. Both species had approximately 1:1 sex ratios after the first year, in which males were predominant. The growth of both species was approximately the same after the first year; however peltata, the larger species, apparently gains an advantage during the first year which it never loses. The sexes did not …

A Study Of Hybridization And Behavioral Characters In Percina Notogramma (Rany And Hubbs) And Percina Peltata (Stauffer), Family Percidae, Jules J. Loos

Master's Theses

In view of the close phylogenetic relationship between the two sym­patric species of darters, Percina notogramma (Raney and Hubbs) and Percina peltata (Stauffer), placed in the subgenus Alvordius by Bailey and Gosline (1955), it is of interest to compare them in more detail than has been done in the past. Percina notograrnma occurs only in the Chesapeake Drainage in Virginia, Maryland and West Virginia whereas P. peltata ranges from Virginia to New York. Adequate comparisons of their external. morphological characters have been presented by Raney and Hubbs (1948) in their original description of P. notogramma. Supplementary data were provided by …

Percina Notogramma Montuosa Hogarth, A New Subspecies Of A Percid Fish From The Upper James River, William Thomas Hogarth

Master's Theses

Percina notogramma montuosa is described from 50 specimens taken in the tributaries of the upper James River. It is best separated from Percina notogramma notogramma, which inhabits the lower James, Rappahannock, York, Potomac and Patuxent rivers, on the basis of lateral-line scales (average difference 89%) and scales around the caudal peduncle (average difference 79%). A comparison of the meristic indices resulted in an average difference of 89%. A total of 18 out of 31 meristic and proportional characters were found to give significant differences.

The relatively few specimens from the Rappahannock, Potomac and Patuxent rivers precluded an intensive investigation of …