The Crawfishes of the State of Pennsylvania Vol. 2 No. 10
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This gives a range of from about 35 to 80 during the year, and I have no doubt 480 MEMOIRS OF THE CARNEGIE MUSEUM that the nice restriction of certain periods in the seasonal history is primarily due to differences of temperature. It is only natural that an equalizing of the temperature must tend to efface the seasonal periods.
4. Cambarus diogenes.
According to my observations, which extend over the period from March 22 to November 17, this species also agrees in the main features of its seaso...nal develop- ment with C. obscurus.
I have the following records for females with eggs : April 6, 1905 ; April 19, 1905; May 2, 1901; May 14, 1899, (collected by Atkinson, Graf, and Williamson) ; May 21, 1906 ; May 22, 1905 ; May 27, 1904. On May 21, 1906, and June 2, 1905, I found several females with newly hatched young under the abdomen. In no other part of the year has this been observed, and thus the spawning and hatching season is well fixed (April, May, and the beginning of June), and is found to be identical with that of C.
What to read after The Crawfishes of the State of Pennsylvania Vol. 2 No. 10?
You can find similar books in the "Read Also" column, or choose other free books by Ortmann, A. E. (Arnold Edward), 1863-1927 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
This gives a range of from about 35 to 80 during the year, and I have no doubt 480 MEMOIRS OF THE CARNEGIE MUSEUM that the nice restriction of certain periods in the seasonal history is primarily due to differences of temperature. It is only natural that an equalizing of the temperature must tend to efface the seasonal periods.
4. Cambarus diogenes.
According to my observations, which extend over the period from March 22 to November 17, this species also agrees in the main features of its seaso...nal develop- ment with C. obscurus.
I have the following records for females with eggs : April 6, 1905 ; April 19, 1905; May 2, 1901; May 14, 1899, (collected by Atkinson, Graf, and Williamson) ; May 21, 1906 ; May 22, 1905 ; May 27, 1904. On May 21, 1906, and June 2, 1905, I found several females with newly hatched young under the abdomen. In no other part of the year has this been observed, and thus the spawning and hatching season is well fixed (April, May, and the beginning of June), and is found to be identical with that of C.
What to read after The Crawfishes of the State of Pennsylvania Vol. 2 No. 10?
You can find similar books in the "Read Also" column, or choose other free books by Ortmann, A. E. (Arnold Edward), 1863-1927 to read onlineMoreLess
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