Observations of the under-described avifauna of the Mostardas Peninsula, Rio Grande do Sul, Brazil

Harrison, N. M.; Whitehouse, Martin J.; Madureira, Lauro Saint Pastous

doi:10.15560/9.2.391

Cited by 10 publications

(10 citation statements)

References 9 publications

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“…This was the item with the highest contribution in the diet-based network and one of the most important in the analysis of isotopic-based networks, emphasizing frugivory in these species, as demonstrated by the diet and isotopic methods, and reported in previous studies (Nazaro & Blendinger, 2017;Sabino et al, 2017). Our results also suggest that thrushes are key species in the trophic networks of restinga forests because they are involved in multiple interactions (Scherer, Maraschin-Silva, & Baptista, 2007), ingest a large variety of fruits (Scherer et al, 2007, this study), and are common species in these ecosystems (Bispo & Scherer-Neto, 2010;Harrison, Whitehouse, & Madureira, 2013). The C4/CAM fruits contributed a small amount in networks, with the only exception of T. rufiventris.…”

Section: Discussionsupporting

confidence: 84%

Trophic niche similarities of sympatric Turdus thrushes determined by fecal contents, stable isotopes, and bipartite network approaches

Bosenbecker

Bugoni

2020

Ecology and Evolution

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An ecological niche has been defined as an n‐dimensional hypervolume formed by conditions and resources that species need to survive, grow, and reproduce. In practice, such niche dimensions are measurable and describe how species share resources, which has been thought to be a crucial mechanism for coexistence and a major driver of broad biodiversity patterns. Here, we investigate resource partitioning and trophic interactions of three sympatric, phylogenetically related and morphologically similar species of thrushes (Turdus spp.). Based on one year of data collected in southern Brazil, we investigated niche partitioning using three approaches: diet and trophic niche assessed by fecal analysis, diet and niche estimated by stable isotopes in blood and mixing models, and bipartite network analysis derived from direct diet and mixing model outputs. Approaches revealed that the three sympatric thrushes are generalists that feed on similar diets, demonstrating high niche overlap. Fruits from C3 plants were one of the most important food items in their networks, with wide links connecting the three thrush species. Turdus amaurochalinus and T. albicollis had the greatest trophic and isotopic niche overlap, with 90% and 20% overlap, respectively. There was partitioning of key resources between these two species, with a shared preference for fig tree fruits—Ficus cestrifolia (T. amaurochalinus PSIRI% = 11.3 and T. albicollis = 11.5), which was not present in the diet of T. rufiventris. Results added a new approach to the network analysis based on values from the stable isotope mixing models, allowing comparisons between traditional dietary analysis and diet inferred by isotopic mixing models, which reflects food items effectively assimilated in consumer tissues. Both are visualized in bipartite networks and show food‐consumers link strengths. This approach could be useful to other studies using stable isotopes coupled to network analysis, particularly useful in sympatric species with similar niches.

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Section: Discussionsupporting

confidence: 84%

Trophic niche similarities of sympatric Turdus thrushes determined by fecal contents, stable isotopes, and bipartite network approaches

Bosenbecker

Bugoni

2020

Ecology and Evolution

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“…These wetlands are potentially important for birds, not only because they provide foraging, roosting and breeding habitat for resident species, but also for their role as stopover sites or wintering areas for several migrants of both Nearctic and Neotropical origins (Belton 1994;Guadagnin et al 2005;Bencke et al 2007). However, bird inventories are available only for a few wetlands of Rio Grande do Sul (Mähler-Jr. et al 1996;Accordi and Barcellos 2006;Accordi and Hartz 2006;Bencke et al 2007;Harrison et al 2013). Lack of adequate information on bird species …”

Section: Introductionmentioning

confidence: 98%

Birds of the Reserva Biológica do Mato Grande and surroundings, Rio Grande do Sul, Brazil

Vizentin‐Bugoni¹,

Jacobs²,

Coimbra³

et al. 2015

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Abstract:The Reserva Biológica do Mato Grande encompasses 5,161 hectares of wetlands, restinga forests and grasslands in southern Brazil. Aiming to assemble a list of bird species occurring in the reserve, we carried out 21 monthly expeditions from July 2007 to March 2009 and an additional visit on October 2014, totaling 341 hours of sampling. We additionally searched for records in online databases and museums. In total, 211 species of birds were found, compared to 223.83 (SD = 3.88) and 214.68 (SD = 4.71) species respectively predicted through Jackknife 2 and Chao 2 estimations. Plegadis chihi was the most abundant bird roosting in the reserve. The area is important for the conservation of Circus cinereus, Spartonoica maluroides, Limnoctites rectirostris and Sporophila palustris, which are considered threatened or near-threatened in state, national and/ or global levels. We emphasize the urgent need of implementing the Reserva Biológica do Mato Grande in order to conserve the regional avifauna.

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“…The Rufous-browed Peppershrike (Cyclarhis gujanensis, Aves: Vireonidae) is a mediumsized songbird (22-35 g) that inhabits a wide range of open and semi-open habitats in the Neotropics (from Mexico to Argentina) [45]. This species is not globally threatened, and it is often one of the most frequent species in avian assemblages in which it occurs [45][46][47]. The Rufous-browned Peppershrike produces two short song types (<5 s): an infrequent, slow-paced series of descending notes (song type 1, attributed to the female) and a loud series of melodious, whistled, and frequency-modulated notes (song type 2, attributed to the male) [43,45].…”

Section: Study Speciesmentioning

confidence: 99%

Using Acoustic Data Repositories to Study Vocal Responses to Playback in a Neotropical Songbird

Guimarães

Oliveira

et al. 2023

Birds

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Birds may alter song structure in response to territorial challenges to convey information about aggressive intent or fighting ability. Professional and amateur ornithologists upload daily many birdsong recordings into acoustic data repositories, usually scoring whether songs were recorded in response to a conspecific playback or produced spontaneously. We analyzed recordings from these repositories to evaluate if song traits of Rufous-browed Peppershrikes (Cyclarhis gujanensis) vary between playback-elicited songs and spontaneous songs. For each recording after playback, we chose one spatially closer spontaneous recording to avoid geographic bias. Birds recorded after playback produced slightly longer songs than birds that were singing spontaneously. This result was accounted for by increases in the amount of sound and silence within a song after the playback instead of changes in the mean number or duration of elements. Playback did not alter song frequency parameters (bandwidth, minimum, mean, and maximum frequencies) or song rate. These results indicate that song duration might mediate aggressive interactions in Rufous-browed Peppershrikes. Even considering limitations such as unknown playback stimulus identity and possible pseudoreplication, acoustic data repositories give a unique yet unexplored opportunity to gather insights into the evolution of song flexibility during aggressive encounters.

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Observations of the under-described avifauna of the Mostardas Peninsula, Rio Grande do Sul, Brazil

Cited by 10 publications

References 9 publications

Trophic niche similarities of sympatric Turdus thrushes determined by fecal contents, stable isotopes, and bipartite network approaches

Trophic niche similarities of sympatric Turdus thrushes determined by fecal contents, stable isotopes, and bipartite network approaches

Birds of the Reserva Biológica do Mato Grande and surroundings, Rio Grande do Sul, Brazil

Using Acoustic Data Repositories to Study Vocal Responses to Playback in a Neotropical Songbird

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