Summary
Two mass-crossings between individualsTalitrus saltator from populations differing in theorical escape direction (TED) were made (Fig. 1). In sun orientation tests, the F1 offspring of two Tyrrhenian populations differing 125 ° in TED, placed in the sun for the first time, headed in an intermediate direction between the TEDs of the parents (Fig. 3). In another crossing the F1 offspring of two populations differing 174 ° in TED (a Tyrrhenian and an Adriatic population) showed random orientation (Fig. 4, bottom). Hypotheses are given on the mechanism of genetic control which could explain both the initial results from crossings and specific aspects of the inherited behavioural trait (circularity, continuity, variability in space and time).
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Abbreviations
- TED :
-
theorical escape direction
- L-D :
-
cycle light-dark cycle
- IED :
-
innate escape direction
References
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Pardi, L., Scapini, F. Inheritance of solar direction finding in sandhoppers: Mass-crossing experiments. J. Comp. Physiol. 151, 435–440 (1983). https://doi.org/10.1007/BF00605459
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DOI: https://doi.org/10.1007/BF00605459