{"refrec":{"BRefID":197265,"RR":"<b>Sacchi, C.F.<\/b> (1972). Recherches sur la valence thermique du couple d'esp\u00e8ces intertidales <i>Littorina obtusata<\/i> (L.) et <i>L. mariae<\/i> Sacchi & Rast. (Gasteropoda, Prosobranchia), <b><i>in<\/i><\/b>: Battaglia, B. (Ed.) <i>Fifth European Marine Biology Symposium.<\/i> pp. 207-215","BEntID":189676,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":", <b><i>in<\/i><\/b>: Battaglia, B. (Ed.) <i>Fifth European Marine Biology Symposium. European Marine Biology Symposia,<\/i> 5: pp. 207-215","DocTypID":17,"DocType":"Book chapters","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Sacchi, C.F.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Sacchi, C.F.","Englishabstract":"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.","AbstractOtherLang":null,"BibLvlCode":"AMS","StandardTitle":"Recherches sur la valence thermique du couple d'esp\u00e8ces intertidales <i>Littorina obtusata<\/i> (L.) et <i>L. mariae<\/i> Sacchi & Rast. 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