3 research outputs found

    A new southern limit for the distribution of the thrush-like Wren, Campylorhynchus turdinus (Aves: Troglodytidae)

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    We report the first record of the Thrush-like Wren Campylorhynchus turdinus (Wied, 1831) in the Rio Grande do Sul state, at the city of Santa Maria, Brazil. The record, in which the individual vocalized and changed its perch constantly, was held on April 2015. We extend the known distribution range of the C. turdinus, and establish a new southern limit for its geographic distribution, approximately 460 km from the previous record in Paranå. For the state of Rio Grande do Sul, Helmut Sick reported the presence of the C. turdinus in 1972. However, the occurrence was considered hypothetical because did not agree with its distribution pattern. Therefore, our record of C. turdinus for the state of Rio Grande do Sul update the list for this state. © 2016, Sociedade Brasileira de Ornitologia. All rights reserved

    A NEW BEHAVIOR AT THE LEK BY MALE VIOLET‐CROWNED PLOVERCRESTS (STEPHANOXIS LODDIGESII)

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    ABSTRACT ∙ Males of the Violet‐crowned Plovercrest (Stephanoxis loddigesii) exhibit a lekking reproductive system where agonistic interactions are relatively common. Here we describe a new behavior performed when Violet‐ crowned Plovercrest males are alone on perches. This study was conducted in 2011 at two Violet‐crowned Plovercrest leks located in semi‐deciduous forests of Rio Grande do Sul, Brazil. We performed ad libitum observations on seven males. The new behavior is always performed by solitary males. During the displays the hovering male with raised crest, pointed the beak towards the display perch while flying sideways in semicircles or circles. This behavior is similar to aggressive displays performed in front of perched rival males. Such a display is also present in other species of hummingbirds and may help to prepare males for aggressive aerial exhibitions or, alternatively, may represent a displacement behavior.RESUMO ∙ Um novo comportamento em leques de Beija‐flor‐de‐topete (Stephanoxis loddigesii) Machos do Beija‐flor‐de‐topete (Stephanoxis loddigesii) se agregam em leques, onde interaçÔes agonĂ­sticas sĂŁo relativamente comuns. Aqui, nĂłs descrevemos um novo comportamento que Ă© realizado quando machos do Beija‐flor‐de‐ topete estĂŁo sozinhos nos leques. O estudo foi conduzido em 2011 em dois leques do Beija‐flor‐de‐topete localizados em uma Floresta Semidecidual, no estado do Rio Grande do Sul, Brasil. NĂłs utilizamos o mĂ©todo de ad libitum para observar sete machos. O novo comportamento Ă© realizado por machos solitĂĄrios. Durante as exibiçÔes, os machos pairam no ar com os seus topetes eriçados, dirigindo seus bicos para o poleiro de corte enquanto voam lateralmente formando cĂ­rculos e semicĂ­rculos. Este comportamento Ă© similar Ă s exibiçÔes agressivas realizadas na frente de poleiros de machos rivais. Essa exibição tambĂ©m estĂĄ presente em outras espĂ©cies de beija‐flores, e podem colaborar para preparar os machos para exibiçÔes agressivas aĂ©reas ou, alternativamente, podem representar um comportamento de deslocamento
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