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[variability of reproduction examined in the laboratory between natural populations of helix aspersa müller from the brittany region].laboratory experiments were conducted to investigate the effects of geographical localization of natural populations and sampling dates on the reproduction of the garden snail helix aspersa müller. in brittany, reproductive variability between populations shows the adaptive flexibility of characters describing reproductive activity and the relative stability of reproductive ability.19911768314
photoperiod is the main cue that triggers supercooling ability in the land snail, helix aspersa (gastropoda: helicidae).helix aspersa hibernates in brittany (western france), where it may experience subzero temperatures. studies on cold hardiness, although scarce in land snails, have shown a seasonal variation in supercooling ability, associated with high temperatures of crystallization (tc). in the present work, two key environmental factors, temperature and photoperiod, were studied to elucidate, how they may affect the enhancement of supercooling ability in the snails from the end of summer to winter. nine gro ...200111748935
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