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Craze, P.G.; bin Elahan, B.; Schilthuizen, M. (2006)
Languages: English
Types: Article
Subjects: QH0540, QL
Much can be learned about evolution from the identification of those factors maintaining polymorphisms in natural populations. One polymorphism that is only partially understood occurs in land snail species where individuals may coil clockwise or anti-clockwise. Theory shows that polymorphism in coiling direction should not persist yet species in several unrelated groups of land snails occur in stably polymorphic populations. A solution to this paradox may advance our understanding of evolution in general. Here, we examine two possible explanations: firstly, negative frequencydependent selection due to predation; secondly, random fixation of alternative coiling morphs in tree-sized demes, giving the impression of wider polymorphism. We test these hypotheses by investigating morph-clustering of empty shells at two spatial scales in Amphidromus martensi populations in northern Borneo: the spatial structure of snail populations is relatively easy to estimate and this information may support one or other of the hypotheses under test. For the smaller scale we make novel use of a statistic previously used in botanical studies (the K-function statistic), which allows clustering of more than one morph to be simultaneously investigated at a range of scales and which we have corrected for anisotropy. We believe this method could be of more general use to ecologists. The results show that consistent clustering or separation of morphs cannot be clearly detected at any spatial scale and that predation is not frequency-dependent. Alternative explanations that do not require strong spatial structuring of the population may be needed, for instance ones involving a mechanism of selection actively maintaining the polymorphism.
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    • Asami, T. et al. 1998. Evolution of mirror images by sexually asymmetric mating behavior in hermaphroditic snails. Am. Nat. 152: 225 236.
    • Baddeley, A. et al. 2005. Spatstat: spatial point pattern analysis, model-fitting and simulation. R package ver. 1.6 12, B/http://www.maths.uwa.edu.au/ /adrian/spatstat/ /.
    • Boycott, A. E. and Diver, C. 1923. On the inheritance of sinistrality in Limnaea peregra . Proc. R. Soc. B 95: 207 213.
    • Cain, A. J. and Sheppard, P. M. 1954. Natural selection in Cepaea . Genetics 39: 89 116.
    • Craze, P. G. and Lace, L. A. 2000. Spatial ecology, habitat and speciation in the Porto Santan land snail genus Heterostoma . Biol. J. Linn. Soc. 7: 655 676.
    • Davison, A. et al. 2005. Speciation and gene flow between snails of opposite chirality. PLoS Biol. 3: 1559 1571.
    • Degner, E. 1952. Der Erbgang der Inversion bei Laciniaria biplicata MTG (Gastr. Pulm.). Mitt. Hamburg. Zool. Mus. Inst. 51: 3 61.
    • Diggle, P. J. 1983. Statistical analysis of spatial point patterns. Academic Press.
    • Freeman, G. and Lundelius, J. 1982. The developmental genetics of dextrality and sinistrality in the gastropod Lymnaea peregra . Wilhelm Roux's Arch. Dev. Biol. 191: 69 83.
    • Gigord, L. D. B. et al. 2001. Negative frequency-dependent selection maintains a dramatic flower color polymorphism in the rewardless orchid Dactylorhiza sambucina (L.) Soo`. Proc. Nat. Acad. Sci. USA 98: 6253 6255.
    • Gittenberger, E. 1988. Sympatric speciation in snails: a largely neglected model. Evolution 42: 826 828.
    • Hierck, B. P. et al. 2005. Chirality in snails is determined by highly conserved asymmetry genes. J. Molluscan Stud. 71: 192 195.
    • Hunt, G. R. et al. 2001. Laterality in tool manufacture by crows neural processing and not ecological factors may influence ''handedness'' in these birds. Nature 414: 707 707.
    • Inoda, T. et al. 2003. Asymmetric mandibles of water-scavenger larvae improve feeding effectiveness on right-handed snails. Am. Nat. 162: 811 814.
    • Johannesson, K. et al. 1995. Incipient reproductive isolation between two sympatric morphs of the intertidal snail Littorina saxatilis. Evolution 49: 1180 1190.
    • Johnson, M. S. 1982. Polymorphism for direction of coil in Partula suturalis : behavioural isolation and positive frequency dependent selection. Heredity 49: 145 151.
    • Johnson, M. S. et al. 1990. The coil polymorphism in Partula suturalis does not favour sympatric speciation. Evolution 44: 459 464.
    • Laidlaw, F. F. and Solem, A. 1961. The land snail genus Amphidromus ; a synoptic catalogue. Fieldiana (Zool.) 41: 505 677.
    • Ledergerber, S. et al. 1997. Differences in resting-site preference in two coexisting land snails, Arianta arbustorum and Arianta chamaeleon (Helicidae), on Alpine slopes. J. Molluscan Stud. 63: 1 8.
    • Murray, J. and Clarke, B. 1976. Supergenes in polymorphic land snails. II. Partula suturalis. Heredity 37: 271 282.
    • Orr, H. A. 1991. Is single-gene speciation possible? Evolution 45: 764 769.
    • Ripley, B. D. 1977. Modelling spatial patterns. J. Roy. Stat. Soc. B 39: 172 212.
    • Schilthuizen, M. and Lombaerts, M. 1994. Population structure and levels of gene flow in the Mediterranean land snail Albinaria corrugata (Pulmonata, Clausiliidae). Evolution 48: 577 586.
    • Schilthuizen, M. and Davison, A. 2005. The convoluted evolution of snail chirality. Naturwissenschaften 92: 504 515.
    • Schilthuizen, M. et al. 2005. Population structure and coil dimorphism in a tropical land snail. Heredity 95: 216 220.
    • Seehausen, O. and van Alphen, J. J. M. 1998. The effect of male coloration on female mate choice in closely related Lake Victoria cichlids (Haplochromis nyererei complex). Behav. Ecol. Sociobiol. 42: 1 8.
    • Shigemiya, Y. 2003. Does the handedness of the pebble crab Eriphia smithii influence its attack success on two dextral snail species? J. Zool. 260: 259 265.
    • Sinervo, B. and Lively, C. M. 1996. The rock-paper-scissors game and the evolution of alternative male strategies. Nature 380: 240 243.
    • Stone, J. and Bjo¬® rklund, M. 2002. Delayed prezygotic isolating mechanisms: evolution with a twist. Proc. R. Soc. B 269: 861 865.
    • Sturtevant, A. H. 1923. Inheritance of direction of coiling in Limnaea . Science 58: 269 270.
    • Sutcharit, C. and Panha, S. 2006. Taxonomic review of the tree snail Amphidromus Albers, 1850 (Pulmonata: Camaenidae) in Thailand and adjacent areas: subgenus Amphidromus. J. Molluscan Stud. 72: 1 30.
    • Ueshima, R. and Asami, T. 2003. Single-gene speciation by leftright reversal: a land snail species of polyphyletic origin results from chirality constraints on mating. Nature 425: 679.
    • Upton, G. and Fingleton, B. 1985. Spatial data analysis by example: Volume 1: point pattern and quantitative data. Wiley.
    • Van Batenburg, F. H. D. and Gittenberger, E. 1996. Ease of fixation of a change in coiling: computer experiments on chirality in snails. Heredity 76: 278 286.
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