GENETIC AND MORPHOLOGICAL VARIATION OF POPULATIONS BELONGING TO THE BULINUS TRUNCATUS/TROPICUS COMPLEX (GASTROPODA; PLANORBIDAE) IN SOUTH WESTERN ZIMBABWE
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GENETIC AND MORPHOLOGICAL VARIATION OF POPULATIONS BELONGING TO THE BULINUS TRUNCATUS/TROPICUS COMPLEX (GASTROPODA; PLANORBIDAE) IN SOUTH WESTERN ZIMBABWE. / Mukaratirwa, S.; Kristensen, Thomas K.; Siegismund, Hans Redlef; Chandiwana, S.K.
In: Journal of Molluscan Studies, Vol. 64, No. Part 4, 1998, p. 435-446.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - GENETIC AND MORPHOLOGICAL VARIATION OF POPULATIONS BELONGING TO THE BULINUS TRUNCATUS/TROPICUS COMPLEX (GASTROPODA; PLANORBIDAE) IN SOUTH WESTERN ZIMBABWE
AU - Mukaratirwa, S.
AU - Kristensen, Thomas K.
AU - Siegismund, Hans Redlef
AU - Chandiwana, S.K.
PY - 1998
Y1 - 1998
N2 - Aquatic snails from south western Zimbabwe belonging to the Bulinus trunscatus/tropicus complex vary widely in shell form suggesting that more than one taxon could be present. This possibility was investigated by making observations on snail samples from 13 populations from the Plumtree area, in respect of allozyme variation (5 polymorphic loci), shell morphology (9 variables), copulatory organ and chromosome number. Comparative data were obtained from snails from north western Zimbabwe identified definitely as B. tropicus. Analysis of the genetic structure revealed a high degree of polymorphism (P) ranging from 0.29-0.80 among populations from Plumtree and expected heterozygosity (He) from 0.02-0.22. No enzymatic diagnostic loci were found which could differentiate the different morphs or populations and discriminant function analysis on the morphological data showed an overlap of morphs among populations. Snails analyzed for chromosome number were all diploid (2n = 36). Snails exposed to Schistosoma haematobium mira-cidia were all refractory. This information supports the view of a single species, B. tropicus, which is differentiated due to migration barriers and where environmental variables might be implicated in the morphometric divergence.
AB - Aquatic snails from south western Zimbabwe belonging to the Bulinus trunscatus/tropicus complex vary widely in shell form suggesting that more than one taxon could be present. This possibility was investigated by making observations on snail samples from 13 populations from the Plumtree area, in respect of allozyme variation (5 polymorphic loci), shell morphology (9 variables), copulatory organ and chromosome number. Comparative data were obtained from snails from north western Zimbabwe identified definitely as B. tropicus. Analysis of the genetic structure revealed a high degree of polymorphism (P) ranging from 0.29-0.80 among populations from Plumtree and expected heterozygosity (He) from 0.02-0.22. No enzymatic diagnostic loci were found which could differentiate the different morphs or populations and discriminant function analysis on the morphological data showed an overlap of morphs among populations. Snails analyzed for chromosome number were all diploid (2n = 36). Snails exposed to Schistosoma haematobium mira-cidia were all refractory. This information supports the view of a single species, B. tropicus, which is differentiated due to migration barriers and where environmental variables might be implicated in the morphometric divergence.
M3 - Journal article
VL - 64
SP - 435
EP - 446
JO - Journal of Molluscan Studies
JF - Journal of Molluscan Studies
SN - 0260-1230
IS - Part 4
ER -
ID: 9248988