Evol Ecol Res 11: 43-55 (2009) Full PDF if your library subscribes.
Asexual species of oribatid mites do not have a local-scale colonization advantage over sexual species
Jennifer M. Cianciolo
Biology Department, Indiana University, Bloomington, Indiana, USA
Correspondence: J.M. Cianciolo, Biology Department, Indiana University, 1001 East 3rd Street, Bloomington, IN 47405, USA.
Hypothesis: Asexual species have a colonization advantage relative to sexual species. Such an advantage may allow asexuals to escape from local-scale selection pressures, such as those from competition with sexual species, and permit co-existence of the two reproductive modes.
Organisms: Species of soil mites in the suborder Oribatida with one of three reproductive types: ancient asexual, recent asexual or sexual. Taxonomic relationships indicate that these are likely to be close competitors.
Methods: Small colonizable enclosures, representing both new and defaunated habitat, were placed in a temperate forest and sampled, together with soil cores representing the surrounding habitat, at 2-month intervals over 2 years. Binary logistic regression was used to determine whether mites have a colonization advantage, defined as having a higher prevalence in colonized litter bags than in nearby source soil cores.
Results: Only the most abundant of 17 recent asexual species was found to have a colonization advantage; the rest were the poorest colonizers. Ancient asexuals had moderate colonization rates and sexual species the highest colonization rates. This pattern is opposite to the prediction that asexuals have a colonization advantage.
Keywords: colonization advantage, competition, maintenance of sexual reproduction.
DOWNLOAD A FREE, FULL PDF COPY
IF you are connected using the IP of a subscribing institution (library, laboratory, etc.)
or through its VPN.
© 2009 Jennifer M. Cianciolo. All EER articles are copyrighted by their authors. All authors endorse, permit and license Evolutionary Ecology Ltd. to grant its subscribing institutions/libraries the copying privileges specified below without additional consideration or payment to them or to Evolutionary Ecology, Ltd. These endorsements, in writing, are on file in the office of Evolutionary Ecology, Ltd. Consult authors for permission to use any portion of their work in derivative works, compilations or to distribute their work in any commercial manner.
Subscribing institutions/libraries may grant individuals the privilege of making a single copy of an EER article for non-commercial educational or non-commercial research purposes. Subscribing institutions/libraries may also use articles for non-commercial educational purposes by making any number of copies for course packs or course reserve collections. Subscribing institutions/libraries may also loan single copies of articles to non-commercial libraries for educational purposes.
All copies of abstracts and articles must preserve their copyright notice without modification.