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  • 1
    Electronic Resource
    Electronic Resource
    Influence des factuers externes sur l'activité reproductrice de l'hirudinée rhynchobdelle Piscicola geometra L. (1984)
    Springer
    Hydrobiologia 118 (1984), S. 245-254 
    Details
    ISSN: 1573-5117
    Keywords: leeches ; Piscicola geometra ; photoperiod ; temperature ; nutrition ; maturation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The annual cycle of P. geometra breeding activity depends on light, temperature and nutrition. A photoperiod of about 12-12 delays the genital maturation and prevents the incidence of breeding behaviour. A high temperature speeds up the genital maturation and above a threshold ranging from 15 to 17.5 °C it prevents light from acting. Fasting inhibits egg laying because of its immediate action on the clitellar gland activity. It only acts on oogenesis later.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00046622
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