SEXUAL AND PARTHENOGENETIC POPULATIONS OF THE FRESHWATER SNAIL MELANOIDES TUBERCULATA IN ISRAEL
In: Israel Journal of Ecology and EvolutionSearch for other papers by JOSEPH HELLER in
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Melanoides tuberculoid ranges from far-eastern Asia into Africa. Throughout much of its distribution it reproduces parthenogenetically. In Israel however, males have been found. This study investigates whether sex ratios of M. tuberculata are related to frequency of trematode infections, faunal diversity and chemistry of water.
Thirty-four populations were sampled. Seven of these contained no males, fifteen contained less than 10%, ten had 10–36%, one had 46% and one had 66% males.
Male frequency is not related to trematode infection, neither to their overall frequency nor to the frequency of those parasites which could be identified specifically. Infection frequency is lower in males than in females and higher in large females than in small ones. These results do not support the view that sex is favoured by selection resulting from host-parasite interactions.
Male frequency is not related to habitat diversity either, as expressed by the number of mollusc genera found at a site. It is negatively related to magnesium, potassium and chloride concentrations in the water.
Several additional findings result from the study:
Very sparse populations lack males;
The most stable, predictable habitats have lower-than-average frequencies;
The two highest male frequencies are found in habitats that are at the same time highly unstable (water bodies that were dry in the last two years), densely populated and have M. tuberculata as the sole or overwhelmingly major genus.
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SEXUAL AND PARTHENOGENETIC POPULATIONS OF THE FRESHWATER SNAIL MELANOIDES TUBERCULATA IN ISRAEL
In: Israel Journal of Ecology and EvolutionSearch for other papers by JOSEPH HELLER in
Current site
Google Scholar
PubMed
Search for other papers by VIVIANA FARSTEY in
Current site
Google Scholar
PubMed
Melanoides tuberculoid ranges from far-eastern Asia into Africa. Throughout much of its distribution it reproduces parthenogenetically. In Israel however, males have been found. This study investigates whether sex ratios of M. tuberculata are related to frequency of trematode infections, faunal diversity and chemistry of water.
Thirty-four populations were sampled. Seven of these contained no males, fifteen contained less than 10%, ten had 10–36%, one had 46% and one had 66% males.
Male frequency is not related to trematode infection, neither to their overall frequency nor to the frequency of those parasites which could be identified specifically. Infection frequency is lower in males than in females and higher in large females than in small ones. These results do not support the view that sex is favoured by selection resulting from host-parasite interactions.
Male frequency is not related to habitat diversity either, as expressed by the number of mollusc genera found at a site. It is negatively related to magnesium, potassium and chloride concentrations in the water.
Several additional findings result from the study:
Very sparse populations lack males;
The most stable, predictable habitats have lower-than-average frequencies;
The two highest male frequencies are found in habitats that are at the same time highly unstable (water bodies that were dry in the last two years), densely populated and have M. tuberculata as the sole or overwhelmingly major genus.
| All Time | Past 365 days | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 334 | 40 | 15 |
| Full Text Views | 18 | 0 | 0 |
| PDF Views & Downloads | 11 | 0 | 0 |
