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Some Morphological And Histological Effects Of The Poison Of Lophopodella Carteri (Hyatt) On Young Ambystoma Opacum (Gravenhorst) And Carassius Auratus (Linnaeus), Eric Justin Collins
Some Morphological And Histological Effects Of The Poison Of Lophopodella Carteri (Hyatt) On Young Ambystoma Opacum (Gravenhorst) And Carassius Auratus (Linnaeus), Eric Justin Collins
Master's Theses
Larvae of the marbled salamander, Ambystoma onscum, and the goldfish, Carassius auratus, were subjected to poi soning by homogenates of Lonhopodella carteri. Stock homogenates were prepared by grinding specimens of frozen L. carteri in a rotary blender and adding distilled water to give a 20 percent concentration (wt./vol.); the stock was used to prepare working solutions.
Homogenates from bryozoans collected in 1964 were approximately twice as poisonous as those from the 1963 col lection. It ls possible that chemical changes during stor age and bacterial action prior to freezing caused deterioration of the poisonous principle in the material from 1963. …
Percina Notogramma Montuosa Hogarth, A New Subspecies Of A Percid Fish From The Upper James River, William Thomas Hogarth
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 …