| one publication added to basket [61531] | Contribution à l'écologie des Littorinidae (mollusques gastéropodes prosobranches): 1. Littorina neritoides (L.) et Littorina saxatilis (Olivi) = Contribution to the ecology of the Littorinidae (Mollusca, Gastropoda, Prosobranchia). 1. Littorina neritoides (L.) and Littorina saxatilis (Olivi)
Daguzan, J. (1976). Contribution à l'écologie des Littorinidae (mollusques gastéropodes prosobranches): 1. Littorina neritoides (L.) et Littorina saxatilis (Olivi) = Contribution to the ecology of the Littorinidae (Mollusca, Gastropoda, Prosobranchia). 1. Littorina neritoides (L.) and Littorina saxatilis (Olivi). Cah. Biol. Mar. 17(2): 213-236
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723; e-ISSN 2262-3094, more
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| Abstract |
The use of a transect permits to show the vertical zonation of armorican Littorinidae. The comparative ecology of L. neritoides and L. saxatilis permits to show several essential facts: -in L. neritoides, the reproductive period is extended from Nov to May, whereas L. saxatilis is able to reproduce all along the yr, with 2 maximums (Feb and Sept); the numerical equality of sexes is realized in L. saxatilis whereas in L. neritoides, the sex-ratio is in favour of female (S. R. male/female = 1:2); -in L. saxatilis, ovoviviparous spp, the young live near adults, but in L. neritoides, oviparous spp, the juvenile forms settle at an inferior level, moreover ascend gradually, on a distance of some decimeters, in direction to high levels where the adults live; - in those Littorinidae spp, the population structure is polymodal. |
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