Experiment Station Record, Volume 92, January-June, 1945 Page: 79
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19451 ECONOMIC ZOOLOGY-ENTOMOLOGY 79
with alcohol in the larval stage arrests but moistening with water does not prevent
development. In a series of imagoes the sexes were produced in a ratio of about
1 : 1.
A community study of a disturbed deciduous forest area near Cleveland, Ohio,
with special reference to invertebrates, W. W. DOWDY (Ecol. Monog., 14 (1944),
No. 2, pp. 193-222, ills. 10).-This study refers to a man-modified area about 1.3
miles square, the approach being biotic and five communities being included; the
following conclusions are drawn and a series of successional stages due to disturbance
of a deciduous forest are described: Plant compositions of early stages
of succession were modified by disturbance. The basic pattern of communitysuccession
was not altered by disturbance. The present stage of succession depends
on the amount and kind of disturbance and the length of time since it occurred.
The general phenomena of seasonal and ecological succession held for invertebrates
in disturbed areas; this was true of both soil and herb faunas, as well as of ecological
succession among plants. Disturbance did not seem to- bring about as significant a
reduction in the invertebrates as in the vertebrates. The proximity of man to the
community may have little effect on reducing the number of invertebrates unless
the amount of vegetation is reduced; then the number of invertebrates is reduced.
During winter, temperature is the most important physical influence affecting the
vertical movement of the invertebrates of the soil. Temperature and moisture
acting together during summer are the most important physical factors influencing
the vertical movement of the soil fauna. Invertebrates within the soil are afforded
great protection during winter against outside low air temperatures; the same is
true in summer against outside high air temperatures. The predominant organisms
comprising the invertebrate groups of different communities are different. On the
average, the number of species of invertebrates of the herb and shrub strata, taken
through sweeps, was greater than that of the soil stratum taken through soil samples;
the reverse was true in regard to the number of individuals. There is a
significant difference between the number and kind of species found in different
communities; the same is true in regard to the number of individuals. Coleoptera,
Hemiptera, and Araneida seem to be the most prevalent groups within the area
studied. Dipterous insects were very scarce, except mosquitoes of the genus Aedes.
There are 62 references.
Ponds for improving stream fishing, E. V. SMITH and H. S. SWINGLE
(Alabama Sta: Leaflet 20 (1944), pp. 7, illus. 4).-This informatory leaflet discusses
the construction and proper management of ponds on small streams as appearing
to offer the best method of immediately improving stream fishing. An
expanded pond program is suggested, and some ways in which ponds improve stream
fishing are enumerated.
ObservagSes sobre o combate a Esquistosomose humana em Pernambuco, no
municipio de Catende: fndice de infestacao em Austraorbis e emprego da cal
extinta e do sulfato de cobre no combate aos moluscos [Observations on the control
of human schistosomiasis in Catende, State of Pernambuco, Brazil: Index
of infestation of Austraorbis and use of slaked lime and copper sulfate in combating
these snails], G. JANSEN (Mem. Inst. Oswaldo Cruz, 39 (1943), No. 3,
pp. 335-347, illus. 14; Eng. abs., p. 347).-A survey was made to determine the
incidence of infested snails of the genus Australorbis by cercariae of Schistosomum
mansoni; the high incidence of human infestation is said to be due to the constant
use of rivers inhabited by these snails for bathing and other purposes. It was found
that slaked lime (4-5 percent) gave better results than CuSO4 in eradicating the
snails, as well as being cheaper.
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U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 92, January-June, 1945, book, 1947; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc5064/m1/92/: accessed July 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.