The Plankton of the Illinois River 1894 1899 With Introductory Notes Upon the
The Plankton of the Illinois River 1894 1899 With Introductory Notes Upon the
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Average number of adults in 1895, 942. In 1898, only winter eggs of the species were noted in the plankton in February, June, July, September, and October, though adults were doubtless there. Adults have doubtless oc- curred sporadically in all other years, and in 1895 reach a pulse of 21, 518 on July 6 at 81, which was followed by the appearance of males and winter eggs. All records of adults lie between April 29 and September 14 and above 60. This rare rotifer has not appeared in the literatu...re of fresh-water plankton elsewhere to my knowledge. Hempel's statement ('99) that his record of its occurrence in the Illinois is the first for this continent must be modified, since Leidy ('87) found it near Philadelphia. It is evidently a summer plank- tont in our waters, and the wide distribution of its winter eggs suggests that it, too, may be poly cyclic ; and their appearance in the plankton in large numbers with reference to the adults taken, leads to the further inference that its center of distribution is prob- ably not in channel waters, and that it may be predominantly limicolous species, or have its center of distribution in the quieter backwaters.
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To quickly assess the difficulty of the text, read a short excerpt:
Average number of adults in 1895, 942. In 1898, only winter eggs of the species were noted in the plankton in February, June, July, September, and October, though adults were doubtless there. Adults have doubtless oc- curred sporadically in all other years, and in 1895 reach a pulse of 21, 518 on July 6 at 81, which was followed by the appearance of males and winter eggs. All records of adults lie between April 29 and September 14 and above 60. This rare rotifer has not appeared in the literatu...re of fresh-water plankton elsewhere to my knowledge. Hempel's statement ('99) that his record of its occurrence in the Illinois is the first for this continent must be modified, since Leidy ('87) found it near Philadelphia. It is evidently a summer plank- tont in our waters, and the wide distribution of its winter eggs suggests that it, too, may be poly cyclic ; and their appearance in the plankton in large numbers with reference to the adults taken, leads to the further inference that its center of distribution is prob- ably not in channel waters, and that it may be predominantly limicolous species, or have its center of distribution in the quieter backwaters.
What to read after The Plankton of the Illinois River 1894 1899 With Introductory Notes Upon the?
You can find similar books in the "Read Also" column, or choose other free books by Charles Atwood Kofoid to read onlineMoreLess
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