. Bulletin. Science; Natural history; Natural history. IS BULLETIN SOUTHERN CALIFORNIA ACADEMY OF SCIENCES VOLUME 75 ALLEGHENY R. iPttlsburgh. KENTUCKY 41° 40° 39° 38° 37° 36° 90° 89° 88° 87° 86° 85° 84° 83° 82° 81° 80° Figure 1. Map of the Ohio River from its origin at Pittsburgh, Pennsylvania, to its confluence with the Mississippi River at Cairo, Illinois. 0 through 10 indicate locations where fish were collected. ported that the information available led "to the generalization that levels of constituent factors in the environment which have a retarding effect on the rate of developmen
. Bulletin. Science; Natural history; Natural history. IS BULLETIN SOUTHERN CALIFORNIA ACADEMY OF SCIENCES VOLUME 75 ALLEGHENY R. iPttlsburgh. KENTUCKY 41° 40° 39° 38° 37° 36° 90° 89° 88° 87° 86° 85° 84° 83° 82° 81° 80° Figure 1. Map of the Ohio River from its origin at Pittsburgh, Pennsylvania, to its confluence with the Mississippi River at Cairo, Illinois. 0 through 10 indicate locations where fish were collected. ported that the information available led "to the generalization that levels of constituent factors in the environment which have a retarding effect on the rate of development, thereby protracting the period of development, are associated with in- creased numbers of vertebrae while those factors which accelerate development are associated with reduced numbers of vertebrae as stated by ; He stated also that the generalization might be refined by determining the period of time required for differentiation of vertebrae. MacCrimmon and Kwain (1969) reported that the "mortality, time of hatch, metabolic rate, and number of vertebrae formed correlated positively with visible light intensity but only during the pre-eyed stage of incubation" in the rainbow trout Salmo gairdneri. By contrast, they found that "the numbers of dorsal and anal fin rays were affected by light intensity during the posteyed incubation period, the greatest number of rays on these fins occurring in fish incubated at light intensity of 10 ; Fowler (1970) made a comprehensive review of factors that control meristic characters in teleosts and other vertebrates. He considered such factors as genetics, temperature, light, salinity, and dissolved oxygen in the development of fishes and reported that each factor or combinations of two or more factors may affect the formation of somites. Lindsey and Harrington (1972), working with Rivulus marmoratus, noted that the "response of the 15 species studied experimentally include about equal
Size: 2027px × 1233px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectnaturalhistory, booksubjectscience
