Anya E. Illes - Publications

1. Illes, A. E., & Yunez-Jimenez, L. In Press. A female songbird out-sings male conspecifics during simulated territorial intrustions. Proceedings of the Royal Society Series B. Abstract

2. Hall, M. L., Molles, L. E., Illes, A. E., & Vehrencamp, S. L. In Press. Singing in the face

of death: male banded wrens sing more to playback in their last breeding season. Journal of Avian Biology. Abstract

3. Illes, A. E., Hall, M. L. & Vehrencamp, S. L. 2006 Vocal performance influences male receiver response in banded wrens. Proceedings of the Royal Society of London, Series B. 273, 1907 – 1912. Abstract

4. Hall, M. H., Illes, A. & Vehrencamp, S. L. 2006 Overlapping signals in banded wrens: long-term effects of prior experience on males and females. Behavioral Ecology. 17, 260-269. Abstract

5. Farji-Brener, A.G. and Illes, A.E. 2000 Do leaf-cutting ants make bottom-up gaps in neotropical rain forests?: a critical review of the evidence. Ecology Letters. 3, 219-227. Abstract

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Abstracts of selected publications

A female songbird out-sings male conspecifics during simulated territorial intrusions

Proceedings of the Royal Society Series B, In press

Abstract

While birdsong is a model system for animal communication studies, our knowledge is derived primarily from study of only one sex and is therefore incomplete. Study of song in a role-reversed species would provide a unique opportunity to study selective pressures and mechanisms specific to females, and to test the robustness of current theories in an empirically novel manner. We investigated function of female song in stripe-headed sparrows (Aimophila ruficauda), a Neotropical, duetting passerine, and found that during simulated territorial intrusions by a female, male or duetting pair, females (1) sang more than males to same-sex and duet playback, (2) played a leading singing in all contexts, and (3) showed a longer-term song response than males. These results suggest that females sing competitively against other females, and that intrasexual selection may be greater among females than among males. This is the first songbird study to show a stronger vocal role in territory defense for females than males. Stripe-headed sparrows are group-living cooperative breeders, and preliminary data suggest that polyandry and/or resource defense may explain strong female singing behavior. Stripe-headed sparrows may be a useful study species for expanding our knowledge of vocal communication in female animals.

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Singing in the face of death: male banded wrens sing more in their last breeding season

Journal of Avian Biology, 2008

Abstract

Investment in signalling is subject to multiple trade-offs that vary with life-stage, leading to a complex relationship between survival and trait expression. We show a negative relationship between survival and song rate in response to simulated territorial intrusion in male banded wrens (Thryothorus pleurostictus), and test several explanations for this association. (i) Male age failed to explain the association: though age affected song rate in a cross-sectional analysis, longitudinal analysis showed that individuals did not increase their song rate as they got older. Reconciling these results suggests differential selection against young males that respond to intrusion with low song rates. (ii) Mortality costs of high song rates did not appear to explain the negative relationship between song rate and survival because, though song rate in response to playback was condition-dependent, high song rates in a different context did not appear to impose mortality costs. (iii) High levels of territorial pressure may have increased mortality, but were not associated with high song rates in response to playback. (iv) Since song rates did not increase with age, but tended to increase only in the last year of life, we tentatively suggest that the negative relationship between song rate and survival could represent a terminal investment in territorial defence by males in their final breeding season, though further work is needed to confirm this conclusion.

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Vocal performance influences male receiver response in banded wrens

Proceedings of the Royal Society Series B, 2006

Abstract

In a variety of songbirds the production of trilled song elements is constrained by a performance tradeoff between how fast a bird can repeat trill units (trill rate) and the range of frequencies each unit can span (frequency bandwidth). High-performance trills serve as an assessment signal for females, but little is known about the signal value of vocal performance for male receivers. We investigated the relationship between trill rate and frequency bandwidth in banded wren (Thryothorus pleurostictus) songs. Trilled song elements showed the same performance tradeoff found in other passerines and individuals differed in performance of some trill types. We tested the hypothesis that males of this species assess each other basedon trill performance with a two-speaker experiment, in which territory owners were presented with alternating renditions of the same song type manipulated to differ in trill rate. Subjects were significantly more likely to approach the faster trill stimulus first. However, subjects that received trill types closer to the performance limit spent less time close to the fast speaker. Our results show that male banded wrens discriminate and respond differently to songs based on their vocal performance. Thus, performance of physically challenging songs may be important in intra- as well as inter-sexual assessment.

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Overlapping signals in banded wrens: long-term effects of prior experience on males and females

Behavioral Ecology, 2006

Abstract

We tested the signal value of song overlapping in banded wrens (Thryothorus pleurostictus), using interactive playback to either overlap or alternate with their songs. Males shortened song duration and decreased variability in song length when their songs were overlapped by playback, suggesting that they were attempting to avoid being overlapped and perhaps being less aggressive. A novel finding was an effect of long-term prior experience: song lengths remained relatively short in alternating trials that followed two or more days after overlapping trials. Approach responses to the two treatments did not differ overall, hilt there was a parallel effect of prior experience: males tended to stay further from the speaker during alternating treatments if they had previously been overlapped by playback. Some females paired to the male subjects sang in response to playback and were also influenced by prior experience, singing more during alternating trials that had not been preceded by an overlapping trial. Male overlappers may signal dominance over a rival to other male or female receivers in a communication network, but it is currently unclear whether overlapping indicates motivation to escalate all aggressive interaction or whether this singing strategy is related to male quality. Banded wrens are long lived and maintain year-round territories, so modifying responses to rivals based oil prior experience is likely to be important for success.

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Do leaf-cutting ants make bottom-up gaps in neotropical rain forests?: a critical review of the evidence.

Biology Letters, 2000

Abstract

We discuss the role of leaf cutting ant nests (Atta sp.) on the formation of understory "bottom-up" gaps in tropical rain forests. We (i) describe the characteristics of Atta nests that qualify them as promoters of understory gaps; (ii) review the effects of Atta nests on the dynamics of systems other than tropical forests; and (iii) discuss the hypotheses that in neotropical rain forests Atta nests affect plant productivity, and also influence distribution and community composition of the flora. Finally, we discuss the importance of Atta nests in the dynamics of forests and compare their effects with the better-known effects of treefall gaps. Atta nests modify soil structure, soil nutrient content, light intensity at ground level, seed bank composition and understory structure. The presence of the nest and associated refuse also accelerates the soil nutrient cycles. The size, high frequency, turnover rate and duration of these nests could make them a good substrate for particular species of plants. In spite of their potential importance, little information exists on the effects of Atta nests on plant productivity and/or plant composition in neotropical rain forests.

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	Anya E. Illes \| Research \| Publications \| CV \| Teaching \| Illustration \| University of Washington \| ailles@u.washington.edu