Abstract
Chromosomes of the brooding species Lasaea consanguinea were studied as part of a general invertigation of evolutionary genetics of antarctic bivalve species. Laseid species are of particular interest because they are widely distributed geographically, they inhabit the high intertidal zone, and they may reproduce apomictically.
The diploid number of chromosomes for Lasaea consanguinea ranges from 100 to 120, 110 to 112 being most frequent. Karyological data (2n=108) show 6 groups of chromosomes. Group I includes 8 metacentric (m), 3 submetacentric (sm), 2 subtelocentric (st) and 4 telocentric (t) pairs. Group II has 11 t to st pairs; group III, 9 sm to m pairs; group IV, 8 m to sm pairs; group V, 6 st and group VI, 3 m pairs. Within each of the Groups II to VI chromosome pairs are of about the same size and morphology.
The chromosomes of Lasaea consanguinea are unusual because of their abundance, their large size and their numerical variability. We suggest that Lasaea consanguinea has had a hermaphroditic ancestor where abnormal reproduction such as inbreeding, lack of males, and apomixy gave rise to genetic instability, the high number of chromosomes being related to the genetic instability with evolutionary polyploidy or/and supernumerary chromosomes.
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Ahmed, H. & Sparks, A. K., 1970. Chromosome number, structure and autosomal polymorphism in the marine mussels Mytilus edulis and Mytilus californianus. Biol. Bull. 38: 1–13.
Arnaud, P. M., 1974. Contribution à la bionomie benthique des régions antarctiques et subantarctiques. Tethys 6: 465–653.
Crisp, D. J., Burfitt, A., Rodrigues, K. & Budd, H. D., 1983. Lasaea rubra: an apomictic bivalve. Mar. Biol. Letters 4: 127–136.
De Bovée, F., 1987. Saisie semi-automatisée de paramètres biométriques. Vie Milieu 37(1): 21–22.
Dell, R. K., 1972. Antarctic benthos. Adv. mar. Biol. 10: 1–126.
Evans, H. J., 1960. Supernumerary chromosomes in wild populations of the snail Helix pomatia L. Heredity 15: 129–138.
Goldman, M. A., Lo Verde, P. T., Chrisman, C. L. & Franklin, D. A., 1984. Chromosomal evolution in planorbid snails of the genera Bulinus and Biomphalaria. Malacologia 25(2): 427–446.
Levan, A., Fredga, K. & Sandberg, A. A., 1964. Nomenclature for centromere position in chromosomes. Hereditas 52: 101–220.
Nakamura, H. K., 1985. A review of molluscan cytogenetic information based on the CISMOCH-computerized system for molluscan chromosomes. Bivalvia, Polyplacophora and Cephalopoda. Venus 44: 193–225.
O'Foighil, D., 1985 Fine structure of Lasaea subviridis and Mysella tumida sperm (Bivalvia, Galeommatacea). Zoomorphology 105: 125–132.
Oldfield, E., 1955. Observations on the anatomy and mode of life of Lasaea rubra and Turtonia minuta. Proc. malac. Soc. London 31: 226–247.
Oldfield, E., 1961. The functional morphology of Kellia suborbicularis (Montagu), Montacuta ferruginosa (Montagu) and M. subtriata (Montagu) (Mollusca, Lamellibranchia). Proc. malac. Soc. London 34: 255–293.
Oldfield, E., 1964. The reproduction and development of some members of the Erynicidae and Montacutidae (Mollusca, Eulamellibranchia). Proc. malac. Soc. London 36: 79–120.
Patterson, C. H. & Burch, J. B., 1978. Chromosomes of pulmonate molluscs, p. 171–217 In: V. Fretter & J. Peake, eds. Pulmonates: systematics, evolution and ecology, vol. 2A. Academic Press, New York.
Pelseneer, P., 1903, Resultats du voyage du S.Y. Belgica, 1897–1899. Zoologie Mollusques, pp. 1–85. Anvers.
Ponder, W. F., 1971. Some New Zealand and subantarctic bivalves of the Cyamacea and Leptonacea with descriptions of new taxa. Rec. Dom. Mus. N.Z. 7(13) 119–141.
Richardson, M. G., 1979. The ecology and reproduction of the brooding antarctic bivalve Lissarca miliaris. Brit. Ant. Surv. Bull. 44: 125–142.
Roberts, D., 1984. A comparative study of Lasaea australia, Vulsella spongiarum, Pinna bicolor and Donacila cuneata (Mollusca, Bivalvia) from Princess Royal Harbour, Western Australia. J. Moll. Stud. 50: 129–136.
Seed, R. & O'Connor, R. J., 1980. Shell shape and seasonal changes in population structure in Lasaea rubra (Bivalvia: Erycinidae). J. Moll. Stud. 46: 66–73.
Thiriot-Quiévreux, C., 1984. Chromosome analysis of three species of Mytilus (Bivalvia Mytilidae). Mar. Biol. Letters 5: 265–273.
Thiriot-Quiévreux, C., 1986. Etude de l'aneuploîdie dans différents naissains d'Ostreidae (Bivalvia). Genetica 70: 225–231.
Thiriot-Quiévreux, C. & Ayraud, N., 1982. Les caryotypes de quelques espèces de Bivalves et de Gastéropodes marins. Mar. Biol. 70: 165–172.
Thiriot-Quiévreux, C., Soyer, J., Bouvy, M. & Allen, J. A., 1988. Chromosomes of some subantarctic brooding bivalve species. Veliger 30(3): 248–256.
White, M. J. D., 1973. Animal cytology and evolution (3 ed.). Cambridge University Press (pp. 696–750).
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Thiriot-Quiévreux, C., Soyer, F., de Bovée, F. et al. Unusual chromosome complement in the brooding bivalve Lasaea consanguinea . Genetica 76, 143–151 (1988). https://doi.org/10.1007/BF00058813
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DOI: https://doi.org/10.1007/BF00058813