Distribution, abundance and shell morphology of Littorina saxatilis (Olivi) and Littorina arcana Hannaford Ellis at Robin Hood's Bay, North Yorkshire

Hydrobiologia ◽  
1990 ◽  
Vol 193 (1) ◽  
pp. 233-240 ◽  
Author(s):  
C. Dytham ◽  
J. Grahame ◽  
P. J. Mill
Keyword(s):  
Shell Morphology ◽  
Littorina Saxatilis ◽  
Littorina Arcana

scholarly journals Shell Shape Variation in Littorina Saxatilis and L. Arcana: A Case of Character Displacement?

1989 ◽  
Vol 69 (4) ◽  
pp. 837-855 ◽  
Author(s):  
J. Grahame ◽  
P.J. Mill
Keyword(s):  
Character Displacement ◽  
Shell Morphology ◽  
Shell Shape ◽  
Rocky Shores ◽  
Littorina Saxatilis ◽  
Shape Variation ◽  
Separate Species ◽  
Wide Range ◽  
Littorina Arcana ◽  
Variable Species

It is now well established that there are several species in the group of rough periwinkles inhabiting European rocky shores. The usual consensus agrees on four, namely Littorina saxatilis (Olivi), Littorina arcana Ellis, Littorina nigrolineata Gray and Littorina neglecta Bean. The first two species are particularly difficult to distinguish in the field and have received much attention. Recent work indicates that the ovoviviparous L.saxatilis is a very variable species living in a wide range of habitats (e.g. Janson, 1985) and that, although it is close to the oviparous L. arcana in shell morphology and in genotype, the two are separate species (Ward & Warwick, 1980; Ward & Janson, 1985), and not reproductive morphs of the same species.

Patterns of variation in Aat-1 allele frequencies in rough periwinkles (Littorina) suggest similar selection regimes rather than conspecificity

1992 ◽  
Vol 72 (2) ◽  
pp. 499-502 ◽  
Author(s):  
J. Grahame ◽  
P.J. Mill ◽  
M. Double ◽  
S.L. Hull
Keyword(s):  
Gene Diversity ◽  
Enzyme Polymorphism ◽  
Allele Frequency Distribution ◽  
Littorina Saxatilis ◽  
Common Genetic Variation ◽  
Sympatric Populations ◽  
Common Features ◽  
Littorina Arcana ◽  
Polymorphism Data ◽  
Selection Factors

It has been argued by Johannesson & Johannesson (1990b) that the pattern of common genetic variation in Littorina saxatilis (Olivi) and Littorina neglecta Bean indicates gene flow in sympatric populations of these ‘species’. They suggest that L. neglecta is not a good species. We report that a gene diversity analysis of polymorphism in Aat-1 suggests that L. saxatilis and Littorina arcana Hannaford Ellis also show common features in allele frequency distribution. This casts doubt on the argument of Johannesson & Johannesson (1990b) from enzyme polymorphism data on Aat-1 that L. neglecta may simply be an ecotype of L. saxatilis. It seems likely that the similarities are due to operation of the same selection factors on all these species.

scholarly journals Phylogeographic analysis reveals a deep lineage split within North Atlantic Littorina saxatilis

2011 ◽  
Vol 278 (1722) ◽  
pp. 3175-3183 ◽  
Author(s):  
Meredith M. Doellman ◽  
Geoffrey C. Trussell ◽  
John W. Grahame ◽  
Steve V. Vollmer
Keyword(s):  
North Atlantic ◽  
Sequence Data ◽  
Model Organisms ◽  
Phylogeographic Structure ◽  
Littorina Saxatilis ◽  
Mtdna Sequence ◽  
Littorina Arcana ◽  
Mtdna Lineages ◽  
Eastern North Atlantic ◽  
The Last Glacial

Phylogeographic studies provide critical insight into the evolutionary histories of model organisms; yet, to date, range-wide data are lacking for the rough periwinkle Littorina saxatilis , a classic example of marine sympatric speciation. Here, we use mitochondrial DNA (mtDNA) sequence data to demonstrate that L. saxatilis is not monophyletic for this marker, but is composed of two distinct mtDNA lineages (I and II) that are shared with sister species Littorina arcana and Littorina compressa . Bayesian coalescent dating and phylogeographic patterns indicate that both L. saxatilis lineages originated in the eastern North Atlantic, around the British Isles, at approximately 0.64 Ma. Both lineages are now distributed broadly across the eastern, central and western North Atlantic, and show strong phylogeographic structure among regions. The Iberian Peninsula is genetically distinct, suggesting prolonged isolation from northeastern North Atlantic populations. Western North Atlantic populations of L. saxatilis lineages I and II predate the last glacial maximum and have been isolated from eastern North Atlantic populations since that time. This identification of two distinct, broadly distributed mtDNA lineages further complicates observed patterns of repeated incipient ecological speciation in L. saxatilis , because the sympatric origins of distinct ecotype pairs on eastern North Atlantic shores may be confounded by admixture of divergent lineages.

scholarly journals Historical Biogeography of the Marine Snail Littorina saxatilis Inferred from Haplotype and Shell Morphology Evolution in NW Spain

PLoS ONE ◽  
2016 ◽  
Vol 11 (8) ◽  
pp. e0161287 ◽  
Author(s):  
Terencia Tirado ◽  
María Saura ◽  
Emilio Rolán-Alvarez ◽  
Humberto Quesada
Keyword(s):  
Historical Biogeography ◽  
Shell Morphology ◽  
Morphology Evolution ◽  
Littorina Saxatilis ◽  
Nw Spain ◽  
Marine Snail
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