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The relationship between temperature and rhythmic cirral activity in some Cirripedia considered in connection with their geographical distribution

Die Beziehung zwischen Temperatur und rhythmischer Rankenfußaktivität bei einigen Cirripedia, betrachtet im Zusammenhang mit ihrer geographischen Verbreitung

Kurzfassung

Balaniden vermögen einen weiten Temperaturbereich zu ertragen. Auf äußere Reize reagieren sie aber nur innerhalb eines kleineren Bereiches, und ihre volle Aktivität entfalten sie nur innerhalb relativ enger Temperaturgrenzen. Für die Beurteilung ihres ökologischen Potentials in verschiedenen Arealen der Verbreitungsgebiete ist der zuletzt genannte Bereich der wichtigste. Während der letzten 10 Jahre wurde die Aktivität vieler europäischer und amerikanischer Arten aus einer Vielzahl verschiedener Habitate und Klimate untersucht, wobei die Schlagfrequenz der Rankenfüße — ein temperaturabhängiger Indikator der allgemeinen Stoffwechselrate — als Kriterium diente. Bei einigen weitverbreiteten Arten konnten physiologische Varietäten oder Subspezies nachgewiesen werden und frühere, rein morphologische Beurteilungen zur Validität von Arten und anderen taxonomischen Einheiten bestätigt oder abgelehnt werden. Im Vergleich zu den Anpassungen an Gezeitenhöhe und der Intensität der Welleneinwirkung wurden bei einigen weitverbreiteten Formen nur geringfügige Latitüden-und Temperaturadaptationen gefunden. Ganz allgemein unterstreichen die Ergebnisse die Bedeutung physiologischer Daten für taxonomische Beurteilungen ebenso wie die Notwendigkeit systematischer Exaktheit in der Physiologie.

Summary

1. Barnacles can tolerate quite a wide range of temperature without being killed, remain responsive to stimuli over a more limited range, but are fully active only within relatively narrow limits. It is the last range that is most important in determining the fitness of a species to its geographical distribution and the extent of competition between species.

2. During the past ten years work has been carried out on many European and American species from a wide variety of habitats and climates. Activity has been measured as rate of rhythmic beating of the cirri, a temperature-dependent process which is an index to general metabolic rate.

3. It has been possible to show the existence of sub-species or physiological varieties in some apparently widespread species, and to confirm or deny previous assumptions made on morphological grounds as to the validity of species and other taxa.

4. In a few widespread forms little latitudinal or temperature adaptation was found compared with differences related to tide-level and degree of exposure to waveaction.

5. In general the results empasize the importance of physiological data in taxonomy as well as the need for systematic exactness in physiology.

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Southward, A.J. The relationship between temperature and rhythmic cirral activity in some Cirripedia considered in connection with their geographical distribution. Helgolander Wiss. Meeresunters 10, 391–403 (1964). https://doi.org/10.1007/BF01626121

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  • DOI: https://doi.org/10.1007/BF01626121

Keywords

  • Waste Water
  • Metabolic Rate
  • Geographical Distribution
  • Physiological Variety
  • Physiological Data