Monochromatism, cryptic sexual dimorphism and lack of assortative mating in the Rufous Hornero,<i>Furnarius rufus albogularis</i>

Diniz, Pedro; Ribeiro, Pedro H. L.; Rech, Gianlucca S.; Macêdo, Regina H.

doi:10.1071/mu15118

Cited by 19 publications

(12 citation statements)

References 33 publications

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“…Studied adults were molecularly sexed ( n = 30) or had their sexes assigned based on their partner's sex ( n = 2). Banding and trapping procedures are described in Diniz, Ribeiro, Rech, and Macedo () and occurred during the breeding season that preceded this experimental procedure.…”

Section: Methodsmentioning

confidence: 99%

Partners coordinate territorial defense against simulated intruders in a duetting ovenbird

Diniz

Rech

Ribeiro

et al. 2019

Ecology and Evolution

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Duets in breeding pairs may reflect a situation of conflict, whereby an individual answers its partner's song as a form of unilateral acoustic mate guarding or, alternatively, it may reflect cooperation, when individuals share in territory defense or safeguard the partnership. The degree of coordination between the sexes when responding to solo versus paired intruders may elucidate the function of songs in duets. We examined this issue in a study with rufous horneros (Furnarius rufus), a duetting, socially monogamous Neotropical species with low levels of extrapair paternity. We exposed social pairs during the nonbreeding season to playbacks of duets, male solos, female solos, and control heterospecific songs. Partners approached all conspecific stimuli together and responded by singing quickly, at higher rates and by coordinating ~80% of their songs into duets. For both sexes, most response variables (seven of nine) did not vary across conspecific treatments. These results suggest that partners duet and coordinate behaviors to cooperatively defend common territories. However, females spent more time in territorial vigilance, and partners were highly coordinated (correlated responses) in response to duets and female solos in comparison with male solos. This indicates that female intrusions (paired or solo) might be more threatening than male intrusions in the nonbreeding season, especially for territorial females, and that females are less cooperative with their partners in territory defense against male intruders.

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Section: Methodsmentioning

confidence: 99%

Partners coordinate territorial defense against simulated intruders in a duetting ovenbird

Diniz

Rech

Ribeiro

et al. 2019

Ecology and Evolution

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“…The rufous hornero is a sexually monochromatic and socially monogamous bird species from South America (Sick 2001, Diniz et al 2016, Remsen and Bonan 2016. This species lives in open habitats, mainly urban parks and agricultural land, from central Brazil to central Argentina (Remsen and Bonan 2016).…”

Section: Study Speciesmentioning

confidence: 99%

Duetting behavior in a Neotropical ovenbird: sexual and seasonal variation and adaptive signaling functions

Diniz

Silva

Webster³

et al. 2018

Journal of Avian Biology

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Duetting is a collective behavior and might have multiple functions, including joint territory defense and mate guarding. An important step toward understanding the adaptive function of bird song is to determine if and how singing behavior varies seasonally. However, seasonal patterns for duetting species are different from the pattern described for species in which only the male sings, because song function may vary according to sex, singing role (initiator vs responder) and level of duet organization (individual vs pair). We investigated whether patterns of seasonal variation in duetting depends on these factors, which would suggest different interpretations of song function. We studied social pairs of a Neotropical bird species (rufous hornero Furnarius rufus) for seven consecutive months, recording vocal and territorial behaviors. Overall, partners coordinated 61% of their songs into duets and many song traits (song initiation rate, song output and duet rate) peaked in territorial contexts. Males engaged in territorial interactions with strangers more often, initiated more songs, and answered proportionately more of their partners’ songs than females. Male song initiation rate peaked during the pre‐ and post‐breeding stages, whereas females initiated more songs during the non‐breeding season. Both sexes answered partner songs faster and at higher rates during the pre‐breeding and female fertile stages. Partners duetted at a higher rate during the pre‐ and post‐breeding stages. Finally, song initiation rates and duet rate, but not song answering rates, correlated with frequency of territorial interactions with strangers. Although our findings indicate that song function may vary with sex, singing role and level of duet organization, our results suggest that in general duet functions to defend common territories and as a mutual mate guarding strategy in the rufous hornero.

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“…For ethical reasons we could not use more than one decoy (i.e., the visual component of the STIs was the same for every territory). However, horneros are sexually indistinguishable in morphological traits (i.e., mass, tarsus and bill) and plumage coloration (i.e., assessed in relation to the avian visual system; Diniz et al ., 2016). Further, in a comparable STI study done in European great tits ( Parus major ) the decoys used (n=15) did not explain any significant variation in aggressive behavior (Araya-Ajoy & Dingemanse 2013); thus, suggesting that the use of only one decoy did not bias our results.…”

Section: Methodsmentioning

confidence: 99%

“…The hornero represents an excellent model system to study the effects of acute aggression across sexes. They are seasonal breeders and both sexes are involved in territorial defense throughout the year, with males being more aggressive than females [33,34]. Further, horneros are sexually monomorphic in both body size [i.e., there is no difference in body condition between sexes; 34] and plumage, and all breeding behaviors studied so far, except for aggressive interactions, are shared and coordinated between the sexes [35,36].…”

Section: Introductionmentioning

confidence: 99%

Acute aggressive behavior perturbates the oxidative status of a wild bird independently of testosterone and progesterone

Mentesana

Adreani

2020

Preprint

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9Aerobically demanding activities like aggression can lead to an elevated oxidative 1 0 metabolism influencing the balance between pro-oxidant and antioxidant compounds and 1 1 result in an overall increase in oxidative stress. Aggression may also generate oxidative stress 1 2 indirectly through an increase in testosterone levels and in metabolic rate. Given that 1 3 oxidative stress could represent a physiological cost of aggression we tested the hypothesis 1 4 that acute aggressive behavior can increase oxidative stress and evaluated the role of 1 5 testosterone as a potential mediator. To achieve this, we experimentally manipulated the 1 6 aggressive behavior of wild male and female birds and measured pro-oxidants, enzymatic-1 7 and non-enzymatic antioxidants, and testosterone concentrations. After 20 minutes of 1 8 aggressive behavior, both sexes had higher levels of oxidative stress levels than control 1 9individuals. This effect was independent of testosterone levels and much stronger in females.

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Monochromatism, cryptic sexual dimorphism and lack of assortative mating in the Rufous Hornero,Furnarius rufus albogularis

Cited by 19 publications

References 33 publications

Partners coordinate territorial defense against simulated intruders in a duetting ovenbird

Partners coordinate territorial defense against simulated intruders in a duetting ovenbird

Duetting behavior in a Neotropical ovenbird: sexual and seasonal variation and adaptive signaling functions

Acute aggressive behavior perturbates the oxidative status of a wild bird independently of testosterone and progesterone

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