摘要:
The numbers of moths in flight, from night to night, over areas on which observations were made concurrently, show high correlations, although catch on non-contiguous areas differed more than would have been expected by chance. Polynomials of the fourth degree were found the most satisfactory relations to fit in determining seasonal trend of flight for each year.The relations between numbers of moths in flight and physical conditions in the evening were investigated by the variate-difference procedure, using first differences. The numbers of moths and evening temperature showed a consistent moderate positive correlation. The numbers of moths and daily maximum temperature were positively correlated but the partial correlation, holding evening temperature constant, showed no relationship. The numbers of moths and evening humidity were not correlated, either simply, or as a partial correlation holding evening temperature constant. The numbers of moths and evening wind velocity, both simply and as a partial correlation holding evening temperature constant, showed a consistent moderate negative correlation.For the relation between temperature and activity two successive approximations to a polynomial of the third degree were fitted jointly to all years. For temperatures below 60° F. there was no appreciable activity on the part of the moths Activity increased with rise in temperature, although less rapidly as temperature became high. In general, activity at a given temperature was greater as the temperature of the preceding day was low.
ISSN:1923-4287
DOI:10.1139/cjr38d-005
出版商:NRC Research Press
年代:1938
数据来源: NRC