SELF-FERTILIZATION VERSUS CROSS-FERTILIZATION IN THE HERMAPHRODITIC FRESHWATER SNAIL BULINUS GLOBOSUS
نویسندگان
چکیده
منابع مشابه
Negative correlation between male allocation and rate of self-fertilization in a hermaphroditic animal.
Sex-allocation theory predicts that the evolution of increased rates of self-fertilization should be accompanied by decreased allocation to male reproduction (sperm production and broadcast). This prediction has found support in plants but has not previously been tested in animals, which, in contrast to biotically pollinated plants, are free of complications associated with incorporating the co...
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Intermediate hosts of Schistosoma haematobium, the causative agent of urinary schistosomiasis, in Lake Malaŵi include: Bulinus globosus, a member of the B. africanus group and B. nyassanus, a diploid member of the B. truncatus/tropicus species complex. We compared genetic variability between isolates of S. haematobium from the southern part of the lake (Cape Maclear), where both B. globosus and...
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Enterprises pursue innovation in terms of products, processes, market. In relation to market innovation, the paper presents a technique of exploration of new markets based on the participation of an organization’s members in sharing their knowledge of extra-curricular domains. The technique has been experimented in a Small/Medium Enterprise (SME) with good results, also in terms of knowledge sh...
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BACKGROUND Given that increase in temperature may alter host-parasite relationships, the anticipated rise in temperature due to global warming might change transmission patterns of certain diseases. However, the extent to which this will happen is not well understood. METHODS Using a host-parasite system involving Bulinus globosus and Schistosoma haematobium, we assessed the effect of tempera...
متن کاملThe genetical and environmental determination of phally polymorphism in the freshwater snail Bulinus truncatus.
In some species of self-fertile pulmonate snails, two sexual morphs co-occur in natural populations: regular individuals and aphallic individuals that cannot transmit sperm to other snails. Purely aphallic populations therefore reproduce obligatorily by selfing. Understanding the evolution of aphally and selfing in these snails requires a precise knowledge of phally determination. In this paper...
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ژورنال
عنوان ژورنال: Evolution
سال: 1991
ISSN: 0014-3820
DOI: 10.1111/j.1558-5646.1991.tb04380.x