title: A statistical approach to understanding reproductive isolation in two sympatric species of tree crickets.
abstract: In acoustically communicating animals, reproductive isolation between sympatric species is usually maintained through species-specific calls. This requires that the receiver be tuned to the conspecific signal. Mapping the response space of the receiver onto the signal space of the conspecific investigates this tuning. A combinatorial approach to investigating the response space is more informative as the influence on the receiver of the interactions between the features is also elucidated. However, most studies have examined individual preference functions rather than the multivariate response space. We studied the maintenance of reproductive isolation between two sympatric tree cricket species (Oecanthus henryiandOecanthus indicus) through the temporal features of the calls. Individual response functions were determined experimentally forO. henryi, the results from which were combined in a statistical framework to generate a multivariate quantitative receiver response space. The predicted response was higher for the signals of the conspecific than for signals of the sympatric heterospecific, indicating maintenance of reproductive isolation through songs. The model allows prediction of response to untested combinations of temporal features as well as delineation of the evolutionary constraints on the signal space. The model can also be used to predict the response ofO. henryito other heterospecific signals, making it a useful tool for the study of the evolution and maintenance of reproductive isolation via long-range acoustic signals.
authors.affiliation: Centre for Ecological Sciences, Indian Institute of Science, Bangalore, Karnataka 560012, India bmonisha@ncbs.res.in rohini@ces.iisc.ernet.in.
authors.forename: Monisha
authors.identifier: 0000-0003-3717-7996
authors.initials: M
authors.lastname: Bhattacharya
authors.affiliation: Centre for Ecological Sciences, Indian Institute of Science, Bangalore, Karnataka 560012, India.
authors.forename: Kavita
authors.initials: K
authors.lastname: Isvaran
authors.affiliation: Centre for Ecological Sciences, Indian Institute of Science, Bangalore, Karnataka 560012, India bmonisha@ncbs.res.in rohini@ces.iisc.ernet.in.
authors.forename: Rohini
authors.initials: R
authors.lastname: Balakrishnan
mesh_terms: D000161:Acoustic Stimulation; D000818:Animals; D003198:Computer Simulation; D005260:Female; D006135:Gryllidae / Q000502:physiology*; D008297:Male; D008954:Models, Biological; D060047:Reproductive Isolation; D013045:Species Specificity; D061350:Sympatry; D014828:Vocalization, Animal
keywords: Multivariate response space; Oecanthus; Reproductive isolation; Response function; Statistical modelling; Temporal features