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FURTHER STUDIES ON THE FAIRY SHRIMP POPULATIONS OF NORTHEASTERN OHIO

FURTHER STUDIES ON THE FAIRY SHRIMP POPULATIONS OF NORTHEASTERN OHIO,RALPH W. DEXTER,CHARLES H. KUEHNLE

FURTHER STUDIES ON THE FAIRY SHRIMP POPULATIONS OF NORTHEASTERN OHIO   (Citations: 5)
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Over a period of ten years, 1941-1950 inclusive, fairy shrimps have been collected from certain temporary pools and ponds in Portage, Summit, Stark, and Crawford Counties of Northeastern Ohio. Reports on the annual survey for the first six years have already been published (Dexter and Sheary, 1943; Dexter, 1943, 1946; Dexter and Kuehnle, 1948). The present paper summarizes studies of the past four years with additional information on annual fluctuations of populations of the fairy shrimp Eubranchipus vernalis (Verrill), its life history in four selected ponds, some ecological field notes and observations, and new records of geographic distribution. Acknowledgment is made to the trustees of the Research Fund of the Ohio Academy of Science for financial assistance in carrying out the field work, and to those who assisted with the field collections and contributed specimens for study. Each one is mentioned in the paper in connection with his particular contribution, but special thanks are due Mr. Paul Kuehnle for his cooperation in the study of Crawford County ponds over a period of seven years; Mr. Clarence F. Clark who has sent numerous specimens from time to time collected in the Western section of Ohio; and Mr. Frank W. Mead for his collections from Central Ohio. REVIEW OF FIELD COLLECTIONS, 1947 In the season of 1947, 91 pools and ponds were studied (33 in Portage County, 14 in Summit County, and 22 each in Stark and Crawford Counties). Only 38 of these contained fairy shrimps. This was the poorest year for fairy shrimp popula- tions in the ten year survey. While the month of January had much more than average precipitation, February and March were periods of severe drought which may have been partly responsible for the failure of fairy shrimps to appear in some pools. Precipitation iriN the late spring was far in excess of normal rainfall, but this came too late in the year to fill the pools and ponds when hatching normally occurs. While five new ponds inhabited with E. vernalis were discovered in 1947, there were no new appearances of this animal in stations already under observation. E. vernalis returned to nine stations after an absence of one year, but it disappeared from 24 ponds inhabited in 1946. Four stations had a pronounced increase in the abundance of fairy shrimps over the preceding year, and three had a marked decrease in abundance. In general, the fairy shrimp populations were not well developed in Portage and Stark Counties during this year, although Summit County seemed to have nearly its usual abundance. The span of the season in Crawford County was shorter than usual, which is probably accounted for by the dearth of precipitation during the early spring and the shallowness of most of the pools studied in that county. Abundant rainfall in the spring did not seem to compensate for the low precipitation in the late winter. Dr. William C. Stehr, of Ohio University, also found E. vernalis to be scarce in 1947 in ponds he has studied in Athens County. A single specimen only was collected from one of his ponds located east of Athens on Route 50 where they were previously common.
Published in 1951.
Cumulative Annual
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