Aspects of Littorinid Biology

Genetic variability in Littorina saxatilis from different habitats on an island in Galway Bay.- Electrophoretic heterogeneity within and between flat periwinkles (Mollusca: Gastropoda) along an intertidal transect at Ria Ferrol, northwest Spain.- A preliminary study on genetic differentiation in Littorina saxatilis from Galway Bay, Ireland: Littorina tenebrosa Montagu — a valid species or ecotype?.- Lack of significant esterase and myoglobin differentiation in the periwinkle, Littorina striata (Gastropoda, Prosobranchia).- A comparison of different protocols for RAPD analysis of Littorina.- Radular myoglobin and protein variation within and among some littorinid species (Mollusca: Gastropoda).- Allozyme variation and behavioural dimorphism among populations of Littorina brevicula (Philippi) from Japan.- Sexual selection and assortative mating by size and their roles in the maintenance of a polymorphism in Swedish Littorina saxatilis populations.- Rough periwinkle polymorphism on the east coast of Yorkshire: comparison of RAPD-DNA data with morphotype.- Assortative mating between two distinct micro-allopatric populations of Littorina saxatilis (Olivi) on the northeast coast of England.- Natural selection on a vertical environmental gradient in Littorina saxatilis: analysis of fecundity.- Effects of habitat on growth and shape of contrasting phenotypes of Bembicium vittatum Philippi in the Houtman Abrolhos Islands, Western Australia.- Increasing precision in randomised field experiments: barnacle microtopography as a predictor of Littorina abundance.- Temporal variation in parasite loading in relation to life history patterns of Littorina obtusata and L. fabalis.- Gills and size in some small Littorina.- A hot summer, cold winters, and the geographical limit ofTrochocochlea lineata in Somerset.- Density and shell-size variation of Nodilittorina lineolata (Orbigny, 1840) in the intertidal region in southeastern Brazil.- Spawning periodicity of three species of Nodilittorina in Hong Kong.- What to do when there is nothing to do: the ecology of Jamaican intertidal Littorinidae (Gastropoda: Prosobranchia) in repose.- Seasonal variation in soluble uric acid concentration in Littorina saxatilis (Olivi).- Intersex and Littorina littorea in Cork Harbour: results of a medium-term monitoring programme.- Imposex in Nucella lapillus and intersex in Littorina littorea: interspecific comparison of two TBT-induced effects and their geographical uniformity.- Toxico-kinetic and -dynamic aspects of TBT-induced imposex in Hydrobia ulvae compared with intersex in Littorina littorea (Gastropoda, Prosobranchia).- Ultrastructure of prostate gland tissue in males and females with intersex phenomena of Littorina littorea L..- Short Communications.- Diet in Littoraria.- A novel method to assess the cercariae emission intensity of littorinid populations.- Additional records of rough periwinkles in northwest Scotland.- Epilogue.