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Morphological and allozymic variation within and between populations of Bythinella Moquin-Tandon, 1855 (Gastropoda: Prosobranchia). I. Morphological characters

100%

Mazan K.

Folia Malacologica

|

2000

|

tom 08

|

nr 2

Morphology and anatomy of 20 Central European populations of the spring snail Bythinella Moquin-Tandon are described and illustrated.Detailed descriptions, drawings and SEM photographs, as well as measurements of shells, opercula, radulae and soft parts are presented, special attention being paid to the reproductive organs.Intrapopulation and interpopulation differences in 40 biometrical characters in males and 42 in females are analysed, for each sex separately, by means of descriptive statistics and ANOVA.Relations between variables are tested with Kendall’s correlation coefficient.Biometrical characters vary widely within and slightly between the studied populations, whose variability ranges overlap.The length ratios: shell/radula, bursa/bursa duct and bursa/receptacle, as well as the length of bursa copulatrix and ctenidium display a statistically significant S-N clinal variation.The wide intrapopulation variation combined with the slight differences between the distinguished morphospecies in almost all the morphological characters examined indicates a limited diagnostic value of these characters in Bythinella.

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How did Bythinella reach its present distribution in Central Europe?

100%

Mazan K.

Folia Malacologica

|

1999

|

tom 07

|

nr 4

3

Morphological and allozymic variation within and between populations of Bythinella Moquin-Tandon, 1855 (Gastropoda: Prosobranchia). III. Phylogenetic analysis

63%

Mazan K., Szarowska M.

Folia Malacologica

|

2000

|

tom 08

|

nr 4

4

Morphological and allozymic variation within and between populations of Bythinella Moquin-Tandon, 1855 (Gastropoda: Prosobranchia). II. Phenetic analysis

63%

Mazan K., Szarowska M.

Folia Malacologica

|

2000

|

tom 08

|

nr 3

The paper describes morphometric and allozymic differences between 20 Central European populations of Bythinella. Morphometric differences were studied using principal component analysis, based on 40 biometrical characters in males and 42 in females, for each sex separately. The results showed a slight interand a wide intrapopulation morphometric variation, the variability ranges of the populations and postulated morphospecies overlapping. To visualize the pattern of interpopulation allozymic differences, studied at 9 loci, correspondence analysis of allele frequencies and multidimensional scaling based on genetic distances (Prevosti, unbiased Nei and Cavalli-Sforza and Edwards arc distance) were used. The values of Nei distances between populations (0.000–0.362) ranged from ones typical of conspecific populations (in the majority of populations) to ones characteristic rather of congeneric species. The patterns of interpopulation distinctness for molecular and morphological data were different and did not unequivocally confirm either the morphological or molecular distinctness of the distinguished morphospecies. All the genetic distances and Euclidean (morphology-based) distances were correlated with geographic distances, whereas no significant correlations were observed between the genetic and Euclidean distances.

Ograniczanie wyników

4 Folia Malacologica

4 Mazan K.

2 Szarowska M.

3 2000

1 1999

Morphological and allozymic variation within and between populations of Bythinella Moquin-Tandon, 1855 (Gastropoda: Prosobranchia). I. Morphological characters

How did Bythinella reach its present distribution in Central Europe?

Morphological and allozymic variation within and between populations of Bythinella Moquin-Tandon, 1855 (Gastropoda: Prosobranchia). III. Phylogenetic analysis

Morphological and allozymic variation within and between populations of Bythinella Moquin-Tandon, 1855 (Gastropoda: Prosobranchia). II. Phenetic analysis