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Systematics, Redescription, And Geographic Variation Of The Blackside Darter, Percina Maculata (Pisces; Percidae)., Eugene Clifton Beckham Iii
Systematics, Redescription, And Geographic Variation Of The Blackside Darter, Percina Maculata (Pisces; Percidae)., Eugene Clifton Beckham Iii
LSU Historical Dissertations and Theses
A systematic study of the North American percid fish Percina (Alvordius) maculata (Girard) was undertaken to determine the extent and pattern of geographic variation, subspeciation, and sexual dimorphism. A brief nomenclatorial history is presented, the species is redescribed, and variation, distribution, habitat, and subgeneric relationships are discussed. Other than dorsal fin pigmentation, absence of modified midventral scales in females, and limited intrapopulational sexual dimorphism in a few morphometric characters, no variation in most of the thirty-nine characters examined is present between males and females. Morphometrics exhibited no pattern of geographic variation; however, meristic characters revealed a major trend in geographic …
Bacteriological And Toxigenic Studies On Vibrio Species Isolated From The Blue Crab (Callinectes Sapidus) And The Purification Of Toxic Factors Produced By Vibrio Fluvialis (Louisiana)., Susan Lynne Payne
LSU Historical Dissertations and Theses
Eleven cases of cholera occurred in Louisiana in 1978 and except for an isolated case in Texas in 1973, this was the first cholera outbreak in the United States since 1911. The source of the infectious agent was traced to the consumption of crabs, a finding which had adverse effects on the crab industry in Louisiana. During 1979 and 1980 blue crabs were examined bacteriologically for the presence of Vibrio cholerae, the etiological agent of Asiatic cholera, and other pathogenic Vibrio species. Four hundred-eighteen V. cholerae isolates were recovered from crab feces and 144 V. cholerae were recovered from hemolymph …