|Recherches sur la valence thermique du couple d'espèces intertidales Littorina obtusata (L.) et L. mariae Sacchi & Rast. (Gasteropoda, Prosobranchia)|
Sacchi, C.F. (1972). Recherches sur la valence thermique du couple d'espèces intertidales Littorina obtusata (L.) et L. mariae Sacchi & Rast. (Gasteropoda, Prosobranchia), in: Battaglia, B. (Ed.) Fifth European Marine Biology Symposium. pp. 207-215
In: Battaglia, B. (Ed.) (1972). Fifth European Marine Biology Symposium. Piccin Editore: Padova. 348 pp., more
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VLIZ: Proceedings 
|Document type: Conference paper|
Interspecific and intraspecific (for age and sex) differences are studied in the intertidal sibling species Littorina obtusata (L.) and L. mariae Sacchi & Rast. (Gastropoda, Prosobranchia) in regard to their eurythermy. Experiments were carried out at Roscoff, Northern Brittany, in Summer 1970. Resistance to high temperatures (both in aquatic and sub-aerial media) and to low ones was tested. L. obtusata shows a higher thermic valence. This may match its higher resistance to desiccation, previously demonstrated (Sacchi, 1969) to explain its typical zonation on the shore at a level above that of L. mariae. In both species young individuals are not significantly less resistant than adults, while females show a better resistance to high temperatures, a slightly worse one for low temperatures than males.