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Influence of temperature on the rate of beating of the heart of a cladoceran

✍ Scribed by Seiwell, H. R.

Publisher: John Wiley and Sons
Year: 1930
Tongue: English
Weight: 721 KB
Volume: 57
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1400570207

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✦ Synopsis

FOUR l"IQWE8

INTRODUCT JON

Various examples of the fresh-water cladoceran, Simocephalus exspinosus Koch, were subjected to a wide range of controlled temperatures to determine : 1) What uniformity among various individuals there might be in response to changes of temperature; 2) the presence or absence of uniformity in rate of change with rising or falling temperatures; 3) the extent and kind of individual variability in response; 4) the presence or absence for the individual of any consistent correlation between temperature and physiological activity as indicated by the beating of the heart. The rate of the heart was chosen for observation because it can be readily observed through the transparent carapace. For the purpose as stated it was not necessary to use animals of a single clone; it was rather thought preferable to take animals without selection, except as to species.

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