Dietary relationships among four granivorous doves in Venezuelan savannas

Pérez, Elizabeth M.; Bulla, Luis

doi:10.1017/s0266467400001772

Cited by 17 publications

(16 citation statements)

References 26 publications

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“…In general, species with a larger body mass require more food to fulfill their high energy demands, and a greater time spent at a foraging site can provide these individuals with the opportunity to obtain more resources. It has been recorded that an increase in the the food item preferred by species in this study; this was also the case in studies of C. talpacoti in the Venezuela savanna (Pérez & Bulla 2000) and Central Brazil (Cintra et al 1990), and of Z. auriculata in southeastern Brazil (Ranvaud et al 2001), in southern Brazil (Cândido-Junior et al 2008), in northwest Venezuela (Chacín & Calchi 2007) and in Argentina (Murton et al 1974). Moreover, Z. auriculata can be considered to be legitimate seed dispersers (Bucher & Bocco 2009).…”

Section: Variablesupporting

confidence: 82%

“…However, C. picui was most frequently observed in large trees, a fact confirmed by PCA analysis, in which C. picui is more dependent on large trees in the environment than C. talpacoti. Ecological overlap was also recorded in species of the Columbina genus in Venezuela, including C. talpacoti, which had a dietary overlap with three other Columbina species (Pérez & Bulla 2000).…”

Section: Variablementioning

confidence: 94%

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Ecological partitioning of three Columbidae species in Northern Paraná, Southern Brazil

Fontoura

Órsi

2013

Biota Neotrop.

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Three species of Columbidae (Columbina talpacoti, Columbina picui and Zenaida auriculata) were studied in Londrina, Northern Paraná (Brazil), with the aim of analyzing which foraging and habitat factors contribute to their ecological partitioning. The study was conducted over one year in three different areas (urban, rural and pasture). We made monthly observations of the foraging strategies used by the species and the habitats they selected. Possible variations in availability of resources over the twelve months of the study did not influence the type of foraging used by the three species. Significant differences between the foraging strategies used by the species were observed in relation to the foraging site, specifically the foraging substrate. Soil, grass and paving were the foraging substrates that were most used by all three species, indicating that they are ground-foraging birds. Differences in the time spent in the foraging areas were significant between species; Z. auriculata remained in the foraging area for the longest time, often foraging in a group, suggesting a possible adaptation of this species in order to obtain a greater amount of resources. Adapting to anthropological environments without continuous forest cover could be one of factors that the most influential in the selection of habitat by the three species of Columbidae. Principal Components Analysis (PCA) showed differences between the proportions of herbaceous and gramineae plants, paving, plantations and shrubs in the habitats selected by each species. We also concluded that differences in the time spent in the foraging areas and between foraging substrates are factors contributing to the ecological separation of the three species and therefore allowing their coexistence in the region. Resumo: Três espécies de Columbidae (Columbina talpacoti, Columbina picui e Zenaida auriculata) foram estudadas em Londrina, Norte do Paraná (Brasil), com o intuito de analisar quais os fatores de forrageio e hábitat contribuem para a repartição ecológica dessas espécies. O estudo foi conduzido durante um ano em três áreas distintas (urbana, rural e de pastagem). Nós observamos mensalmente as estratégias de forrageio utilizadas pelas espécies e o hábitat que elas selecionam. Possíveis variações na disponibilidade de recursos ao longo dos doze meses de estudo não influenciaram no tipo de forrageio utilizado pelas três espécies. Diferenças significativas entre as estratégias de forrageio utilizadas pelas espécies foram observadas em relação ao local de forrageio, mais especificamente em relação ao substrato de forrageio. Solo, grama e pavimento foram os substratos de forrageio mais utilizados pelas três espécies, indicando que elas são espécies forrageadoras de solo. Diferenças entre o tempo de permanência na área de forrageio foram significativas entre as espécies; e Z. auriculata foi a espécie que se manteve por mais tempo na área de forrageio e frequentemente forrageava em grupo, sugerindo uma possível adaptação da espécie em relação a obtençã...

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Section: Variablesupporting

confidence: 82%

Section: Variablementioning

confidence: 94%

Ecological partitioning of three Columbidae species in Northern Paraná, Southern Brazil

Fontoura

Órsi

2013

Biota Neotrop.

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“…Vertebrate dishes were opened and closed by removing or placing a Petri dish on top at dawn and dusk daily, so seeds were only available to diurnal vertebrates during daytime and to nocturnal vertebrates at night. Granivorous birds only eat during the day in the study site (Pérez & Bulla 2000), but the activity pattern of rodents has not been studied. However, we assumed that diurnal dishes were used only by birds based on the fact that most rodents are nocturnal and the absence of seed husks in the diurnal dishes which were distinctive signs of rodent consumption in nocturnal dishes.…”

Section: Experimental Designmentioning

confidence: 99%

Granivory, seed dynamics and suitability of the seed-dish technique for granivory estimations in a neotropical savanna

et al. 2006

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Spatial and seasonal patterns of seed removal by rodents, ants and birds were evaluated using seed-dish experiments in a Trachypogon savanna in Venezuela. Four-day experiments were conducted on three dates and at four different sites. Seeds from 10 native plant species representing a broad mass range were offered at densities equivalent to 3145 seeds m−2. We found that total seed removal and relative importance of granivorous groups varied widely among sites and dates. Rodents were the major seed predators in all the habitats, except for the savanna/forest border where birds dominated. Ants removed more seeds than birds, but since they preferred the smallest seeds, ants ranked last in mass removed. We found a temporally variable relationship between seed removal rates and seed rain or seed bank. We inferred monthly seed predation from seed-dish experiments as well as through the decline of the seed bank in the environment during the dry season, and compared both estimations to evaluate the suitability of the seed-dish technique for estimating granivory. We initially hypothesized that seed-dish experiments that emulate seed availability more closely may yield a better estimate of seed predation, but in fact, they may still overestimate granivory intensity.

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“…Thus, studies using selective exclosures to investigate the removal of small seeds (< 6 mm) in Neotropical areas may overlook the role of birds as seed removers (but see Pizo and Vieira 2004). Other traits that help birds to be potentially important seed removers in the Neotropics are the abundance and biomass of species that usually consume seeds on the forest floor (tinamous, pigeons, doves, and finches) (Willis and Oniki, 1981;Terborgh et al, 1990), and their flexible foraging behavior that enable them to feed on seeds of quite variable size, shape and nutritional content (Pérez and Bulla, 2000;Christianini, 2001). Most plant species in tropical forests produce small seeds (Foster and Janson, 1985), which are especially prone to be eaten by granivorous birds.…”

Section: Resultsmentioning

confidence: 99%

Toward reliable estimates of seed removal by small mammals and birds in the Neotropics

Christianini

Galetti

2007

Braz. J. Biol.

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Birds are often considered seed predators of less importance when compared to rodents or granivorous ants in studies of seed predation using selective exclosures. However, it is possible that the role of granivorous birds interacting with seeds on the floor of Neotropical forests is being underestimated, if the selective exclosures designed to allow exclusive access to small rodents do not work properly in the Neotropics. We used an experimental approach to evaluate whether birds could remove seeds from selective exclosures designed to allow exclusive access to rodents. We compared seed removal from two paired treatments in the field: an open treatment (control) allowing the access to all vertebrates, and a selective exclosure treatment, where seeds were placed under a cage staked to the ground and covered on top and on the laterals by wire mesh of varying sizes. Treatments were placed in the center of a sand quadrat in order to record the visit of vertebrates from their footprints. Although the selective exclosures are used to tell apart the small mammal seed removal from that of other animals, birds could persistently remove seeds from selective exclosures. Thus, the role of birds interacting with seeds on the floor of tropical forests may be underestimated for some plant species, due to an artifact of the exclosure method employed. Exclosures of 40 x 40 x 40 cm should be efficient to deter the removal of seeds by birds, allowing the consumption of the seeds by small mammals at the same time.Keywords: Columbidae, experimental bias, granivory, seed predation, Tinamidae. Rumo a estimativas confiáveis de remoção de sementes por pequenos mamíferos e aves no Neotrópico ResumoAves são freqüentemente consideradas predadores de sementes de pouca importância, quando comparadas a roedores e formigas granívoras em estudos sobre predação de sementes que utilizam exclusões seletivas. Contudo, é possível que o papel de aves granívoras que interagem com sementes no solo de florestas Neotropicais vem sendo subestimado, se as exclusões seletivas usadas para permitir o acesso exclusivo a pequenos roedores não funcionam de forma apropriada no Neotrópico. Foi usada uma abordagem experimental para avaliar se aves poderiam remover sementes do interior de exclusões seletivas desenhadas para permitir acesso exclusivo a roedores. Comparou-se a remoção de sementes em dois tratamentos no campo: um tratamento aberto (controle) que permite o acesso a todos os vertebrados, e um tratamento de exclusão seletiva, no qual as sementes eram dispostas sob uma gaiola metálica fixada ao solo e recoberta por tela metálica de tamanhos variados. Os tratamentos foram dispostos no centro de uma parcela de areia de forma a registrar a visita de vertebrados por meio de pegadas. Embora as exclusões seletivas sejam usadas para estimar separadamente a remoção de sementes por pequenos mamíferos daquela praticada por outros animais, aves puderam remover sementes das exclusões seletivas. Assim, o papel de aves interagindo com sementes no solo de florest...

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Dietary relationships among four granivorous doves in Venezuelan savannas

Cited by 17 publications

References 26 publications

Ecological partitioning of three Columbidae species in Northern Paraná, Southern Brazil

Ecological partitioning of three Columbidae species in Northern Paraná, Southern Brazil

Granivory, seed dynamics and suitability of the seed-dish technique for granivory estimations in a neotropical savanna

Toward reliable estimates of seed removal by small mammals and birds in the Neotropics

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