Ohio Journal of Science: Volume 72, Issue 1 (January, 1972)

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Front Matter
pp 0
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The Responsibility of the Professional Ecologist in the Preservation of Natural Areas
Stansbery, David H. pp 1-3
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Composition of Gray Squirrel Milk
Nixon, Charles M.; Harper, W. J. pp 3-6
Article description | Article Full Text PDF (278KB)

Resistance to DDT of a Freshwater Alga
Egloff, David A.; Partridge, Robert pp 6-10
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The Compositae of the Oak Openings
Easterly, Nathan William pp 11-21
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Observations on Mating, Oviposition, and Food Habits of Certain Shore Flies (Diptera: Ephydridae)
Deonier, D. L. pp 22-29
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The Herbaceous Angiosperm Flora of Mahoning County, Ohio
Chuey, Carl F. pp 30-49
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Age Determination of a Granite Gneiss from the Precambrian Basement of Scioto County, Ohio
Hofmann, Charles M.; Faure, Gunter; Janssens, A. pp 49-53
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Book Reviews
pp 54-63
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A List of Reviewers of Papers Appearing in the Ohio Journal of Science During 1971
pp 64-64
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Back Matter
pp 999
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    Back Matter
    (1972-01)
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    Book Reviews
    (1972-01)
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    Age Determination of a Granite Gneiss from the Precambrian Basement of Scioto County, Ohio
    (1972-01) Hofmann, Charles M.; Faure, Gunter; Janssens, A.
    Biotite and potassium feldspar from a specimen of granite gneiss from the Precambrian basement of Scioto County (Permit No. 212, Greenup Quadrangle of Green Township) have been dated by the Rb-Sr method. The model dates, calculated relative to an assumed initial 87Sr/86Sr ratio of 0.7040, are 898±40 million years (biotite) and 1242±46 million years (potassium feldspar). The dates are discordant, which suggests that the minerals gained or lost rubidium and/or strontium during an episode of metamorphism. The age of the metamorphism is estimated as 840=t42 million years, assuming that both minerals were isotopically re-equilibrated and had the same 87Sr/86Sr ratio of 0.7178± 0.0026. The model date of the biotite agrees with previous age determinations of basement rocks from Ohio and confirms the interpretation that the Grenville Province of the Canadian Precambrian Shield extends southward into Ohio.
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    The Herbaceous Angiosperm Flora of Mahoning County, Ohio
    (1972-01) Chuey, Carl F.
    A checklist of the herbaceous angiosperms of Mahoning County, Ohio, based upon field observations and collections made during the summer of 1967 and upon the holdings of four major Ohio herbaria are presented. The list represents 73 families, 284 genera, and 527 species, of which 101 species, from the author's collection, are new county records.
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    Observations on Mating, Oviposition, and Food Habits of Certain Shore Flies (Diptera: Ephydridae)
    (1972-01) Deonier, D. L.
    Some observations on mating and oviposition behavior in some common midwestern species of ephydrids are described. The mounting phase of mating in Ochthera mantis (DeGeer) appears to consist of simple, rapid jumping and grasping movements by the male. The male taps the abdomen of the female with his hind tarsi during copulation. Copulation is similar in Parydra quadrituberculata Loew. During seven days of captivity, two females of the latter species deposited 119 separate egg masses, each containing from two to eleven eggs. Oviposition sites such as small rocks and twigs extensively encrusted with egg masses of this species were commonly found in field habitats. Shelter-seeking behavior was also observed. Adults of Ochthera mantis (DeGeer), Parydra quadrituberculata Loew, Scatella stagnalis Fallen, and S. quadrinotata Cresson obtained shelter by clustering in numbers on vegetation and other high objects during heavy rainfall and darkness. The hypothesis that diatoms constitute a potential, abundant, and available food source for shore flies was also tested. The gut contents of specimens representing 30 ephydrid species were surveyed by dissection and by nitric acid digestion of masses of whole flies. The presence of diatom frustules in these guts was interpreted to support this hypothesis.
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    The Compositae of the Oak Openings
    (1972-01) Easterly, Nathan William
    This report is the first of a series of articles to be prepared as a second "Flora of the Oak Openings." The first floral survey of the Oak Openings region in western Lucas County, Ohio, was made by Edwin L. Moseley in 1928. During the present investigation, collecting was done at eight major sites, representing the habitats of the Oak Openings region. Of the 113 taxa annotated in this study, 88 taxa have been found by the present investigator (1970). Nineteen taxa were reported by Moseley that were not found in this study; twenty were found during the present investigation that were not reported by Moseley. Eight taxa are more common now than in Moseley's time (1928); twelve are less common now (1970) than in Moseley's time. The reasons for these changes are not known, but some probable explanations are: (1) some species have come in along Swan Creek and have established themselves in the fioodplain; (2) some species are adventive; (3) manmade changes along roadsides, in cultivated fields, and in housing developments have altered the habitats; and (4) a more thorough investigation of the Oak Openings may change some of Moseley's records.
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    Resistance to DDT of a Freshwater Alga
    (1972-01) Egloff, David A.; Partridge, Robert
    The amount of chlorophyll, the oxygen evolution in the light, and the oxygen uptake in the dark by Chlamydomonas reinhardtii Dangeard are unaffected by exposure to 100-1,000 ppb DDT for 16-96 hours at 18°-22°C in inorganic basal medium with and without acetate in the medium. The growth rate and final cell density of Chlamydomonas reinhardtii Dangeard were identical in control and experimental cultures exposed to 1000 ppb DDT in the growth medium for nine days at 22°C.
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    Composition of Gray Squirrel Milk
    (1972-01) Nixon, Charles M.; Harper, W. J.
    Milk was collected from eight female gray squirrels (Sciurus carolinensis) and pooled for analysis, in an effort to determine the best substitute for gray squirrel milk for preweaned young squirrels. The sample, about 2 cc, contained 9.0 percent protein, 12.1 percent fat, 3.0 percent lactose, 1.3 percent ash, 0.36 percent calcium, and 0.45 percent phosphorus. This analysis is similar to that reported for two samples from single specimens. Infra-red spectroscopy was used for a portion of the analysis. This method provides a useful means of analyzing the small quantities (<0.5 ml) of milk obtainable from a variety of small mammals.
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    Front Matter
    (1972-01)