+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Ecological correlates of male outcrossing ability in a simultaneous hermaphrodite snail

Ecological correlates of male outcrossing ability in a simultaneous hermaphrodite snail

American Naturalist 143(4): 636-655

Phally, a genital dimorphism found in some species of self-compatible simultaneous hermaphrodites, presents an opportunity to examine factors maintaining outcrossing within an animal species that can self-fertilize. Both aphallics and euphallics can self-fertilize, but aphallics cannot donate sperm because they do not develop a functional prostate and penis. In this field study of Nigerian populations of the freshwater gastropod, Bulinus truncatus (Mollusca: Pulmonata), we evaluate ecological correlates of euphally to test hypotheses predicting a selective advantage of outcrossing due to the production of genetically variable offspring. The prevalence of euphally across 49 populations ranged from 0% to 81%. We found no association between prevalence of euphally and any of the following: population density, snail density, mollusk species abundance, water pH, oxidation-reduction potential, dissolved oxygen content, habitat instability (as estimated by habitat type), human activity, vegetation density, desiccation rate, and water chemistry variation. There was a significant but weak correlation between conductivity and proportion of euphallics (r-2 = 10%), with lower ion concentrations favoring higher levels of euphally. The prevalence of the most abundant trematode taxon (Xiphidiocercariae) correlated positively with proportion of euphallics, explaining 10% of the variation in proportion of euphallics after we controlled for mean snail age and time of year. Trematode richness (number of taxa per population) was not associated with proportion of euphallics across sites when we controlled for time of year. However, indexes of trematode diversity that incorporated both prevalence and richness did correlate significantly with proportion of euphallics. These results are consistent with hypotheses predicting an advantage of outcrossing due to temporal fluctuations in the biotic environment.

(PDF emailed within 0-6 h: $19.90)

Accession: 002351192

Download citation: RISBibTeXText

DOI: 10.2307/2462904

Related references

Temperature-determined outcrossing ability in wild populations of a simultaneous hermaphrodite snail. Ecology (Tempe) 75(7): 2066-2077, 1994

Temperature Determination Of Male Outcrossing Ability In A Simultaneous Hermaphrodite. Evolution; International Journal of Organic Evolution 46(6): 1698-1707, 1992

Temperature determination of male outcrossing ability in a simultaneous hermaphrodite. Evolution 46(6): 1698-1707, 1992

Heritability of male outcrossing ability in the simultaneous hermaphrodite bulinus truncatus gastropoda planorbidae. Journal of Zoology (London) 226(2): 311-319, 1992

Effects of Schistosoma haematobium infection on reproductive success and male outcrossing ability in the simultaneous hermaphrodite, Bulinus truncatus. Parasitology 108(1): 27-34, 1994

Determinants of female and male reproductive success in a simultaneous hermaphrodite land snail. Animal Behaviour 82(4): 707-715, 2011

Mating frequency and resource allocation to male and female function in the simultaneous hermaphrodite land snail Arianta arbustorum. Journal of Evolutionary Biology 13(4): 607-614, July, 2000

Loss of male outcrossing ability in simultaneous hermaphrodites: Phylogenetic analyses of pulmonate snails. Journal of Zoology (London) 238(2): 287-299, 1996

Energy budgets and reproductive allocation in the simultaneous hermaphrodite pond snail, Lymnaea stagnalis (L): a trade-off between male and female function. The American Naturalist 144: 1-7, 1994

Reproductive behavior, egg trading, and correlates of male mating success in the simultaneous hermaphrodite, Serranus tabacarius. Environmental Biology of Fishes 43(4): 351-361, 1995

The concept of male outcrossing in hermaphrodite higher plants. Heredity 29 (2) 223-236, 1972

Outcrossing increases infection success and competitive ability: experimental evidence from a hermaphrodite parasite. Evolution; International Journal of Organic Evolution 56(11): 2243-2251, 2002

High outcrossing rates maintain male and hermaphrodite individuals in populations of the flowering plant Datisca glomerata. Nature 359(6396): 633-636, 1992

Sperm competition in the simultaneous hermaphrodite freshwater snail Biomphalaria glabrata. Journal of Molluscan Studies 62(4): 451-457, 1996

The evolution of reproductive isolation in a simultaneous hermaphrodite, the freshwater snail Physa. Bmc Evolutionary Biology 11: 144-144, 2011