Information Services banner Edinburgh Research Archive The University of Edinburgh crest

Edinburgh Research Archive >
Biological Sciences, School of >
Biological Sciences publications >

Please use this identifier to cite or link to this item: http://hdl.handle.net/1842/481

This item has been viewed 8 times in the last year. View Statistics

Files in This Item:

File Description SizeFormat
WestSmithRead2000.pdf209.63 kBAdobe PDFView/Open
Title: Sex allocation and population structure in apicomplexan (protozoa) parasites
Authors: West, Stuart A
Smith, Todd G
Read, Andrew F
Issue Date: 2000
Citation: Proc. R. Soc. Lond. B (2000) 267, 257^263
Publisher: ROYAL SOC LONDON, LONDON
Abstract: Establishing the selfing rate of parasites is important for studies in clinical and epidemiological medicine as well as evolutionary biology. Sex allocation theory offers a relatively cheap and easy way to estimate selfing rates in natural parasite populations. Local mate competition (LMC) theory predicts that the optimal sex ratio (r*; defined as proportion males) is related to the selfing rate (s) by the equation r*=(1-s)/2. In this paper, we generalize the application of sex allocation theory across parasitic protozoa in the phylum Apicomplexa. This cosmopolitan phylum consists entirely of parasites, and includes a number of species of medical and veterinary importance. We suggest that LMC theory should apply to eimeriorin intestinal parasites. As predicted, data from 13 eimeriorin species showed a female-biased sex ratio, with the sex ratios suggesting high levels of selfing (0.8-1.0). Importantly our estimate of the selfing rate in one of these species, Toxoplasma gondii, is in agreement with previous genetic analyses. In contrast, we predict that LMC theory will not apply to the groups in which syzygy occurs (adeleorins, gregarines and piroplasms). Syzygy occurs when a single male gametocyte and a single female gametocyte pair together physically or in close proximity, just prior to fertilization. As predicted, data from four adeleorin species showed sex ratios not significantly different from 0.5.
URI: http://hdl.handle.net/1842/481
ISSN: 0962-8452
Appears in Collections:Biological Sciences publications

Items in ERA are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! Unless explicitly stated otherwise, all material is copyright © The University of Edinburgh 2013, and/or the original authors. Privacy and Cookies Policy