Habitat structure effects on size selection of snail kites (Rostrhamus sociabilis) and limpkins (Aramus guarauna) when feeding on apple snails (Pomacea spp.)

Tanaka, Marcel Okamoto; Souza, Andréa Lúcia Teixeira de; Módena, Érica S.

doi:10.1016/j.actao.2006.02.003

Cited by 25 publications

(28 citation statements)

References 23 publications

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“…In addition, the need to feed may overcome possible difficulties imposed by winds and rains. The size of shells of consumed snails found in the two marshes was very similar and within the size range reported in other studies: 4.6-5.8 cm reported by Estela and Naranjo (2005), 4-5.5 cm in Tanaka et al (2006) and 4-4.5 cm in Mapelli and Kittlein (2011). This suggests a selectivity regarding snail size.…”

Section: Indirect Evaluationsupporting

confidence: 67%

“…ground, vegetation), contrary to studies reporting the exclusive use of perches for prey handling (Collet, 1977;Tanaka et al, 2006). The use of several substrates may be an attempt to reduce the time between capture of the snail and the beginning of handling, since this was identified as the longest step in the feeding process.…”

Section: Direct Evaluationmentioning

confidence: 41%

“…The use of different hunting strategies might be associated to habitat heterogeneity, such as the composition of plant cover in the foraging sites or water body depth (Sykes, 1987;Bennetts et al, 2006;Tanaka et al 2006). Since raptors detect their prey mainly visually (Fox et al, 1976;Jones et al, 2007), habitat heterogeneity might limit their ability to locate preys while flying.…”

Section: Introductionmentioning

confidence: 99%

“…Although many members of this family have a generalist diet (e.g. arthropods, anurans, small mammals), some have a more restrict diet, such as the snail kite [(Rostrhamus sociabilis, (Vieillot, 1817)] (Magalhães, 1990;Tanaka et al 2006). This bird occurs from southern United States to Uruguay and has a specialised diet of gastropod mollusks, more specifically Pomacea sp.…”

Section: Introductionmentioning

confidence: 99%

“…This bird occurs from southern United States to Uruguay and has a specialised diet of gastropod mollusks, more specifically Pomacea sp. (Perry, 1811) (Tanaka et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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Foraging activity of the snail kite, Rostrhamus sociabilis (Aves: Accipitridae) in wetlands of southern Brazil

et al. 2013

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The snail kite (Rostrhamus sociabilis) is widely distributed in the American continent. Its specialised diet consists mostly of the gastropod mollusk Pomacea sp and its foraging strategy probably varies depending on the season, prey availability, and climate factors, which can be reflected in its semi-nomad behaviour. This study was aimed at examining the hunting strategy of the snail kite, and its association with climate factors and habitat heterogeneity. Direct observations of birds between January 2010 and March 2011 in southernmost Brazil revealed that hunting was still the predominant foraging strategy (79% of records) to capture mollusks. Despite morphological specialisations to extract mollusks from the shells, the handling time (average = 92.4 s) was twice as much the time between prey search and capture (average = 55 s). The increase in the number of mollusks ingested apparently occurs when the resting time on perches or any other substrates near the hunting sites decreases between successive unsuccessful attempts. The correlation between the number of consumed preys and the climatic variables examined was low. Regarding habitat heterogeneity, our findings suggest that birds forage preferentially in marshes with low vegetation, which may increase the access to mollusks. The hunting efficiency of the snail kite was high (76 % successful attempts) compared to those of other birds of prey.Keywords: feeding, wetlands, predation, trophic ecology. Atividade de forrageio de gavião-caramujeiro, Rostrhamus sociabilis(Aves: Accipitridae) em áreas úmidas do sul do Brasil ResumoO gavião-caramujeiro (Rostrhamus sociabilis) possui ampla distribuição no continente americano e apresenta dieta especializada no molusco gastrópode Pomacea sp. Possivelmente, a estratégia de forrageio da espécie responde às variações sazonais na disponibilidade de presas, bem como aos fatores climáticos, o que pode refletir em seu comportamento seminômade. O objetivo desse estudo foi avaliar a estratégia de caça do gavião-caramujeiro, buscando suas associações quanto aos aspectos climáticos e à heterogeneidade do habitat. Observações diretas das aves, feitas entre janeiro de 2010 e março de 2011 no extremo sul brasileiro, revelaram que, para a captura dos moluscos, as aves usaram predominantemente a estratégia de caça do tipo still hunting (79% dos registros). Apesar de apresentar especializações morfológicas para a extração dos moluscos da concha, a avaliação do tempo empregado na manipulação (média = 92,4 s) foi quase o dobro do desprendido entre a procura e a captura (média = 55 s) das presas. Aparentemente, o aumento no número de moluscos ingeridos ocorre por meio de redução no tempo de repouso entre sucessivas investidas de captura mal sucedidas, tal como pelo uso de poleiros ou quaisquer outros substratos próximos aos locais de captura. O número de presas consumidas apresenta baixa relação com as variáveis climáticas testadas. Quanto à heterogeneidade do habitat, os dados sugerem que as aves forrageiam preferencialmente em ba...

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Section: Indirect Evaluationsupporting

confidence: 67%

Section: Direct Evaluationmentioning

confidence: 41%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…This bird occurs from southern United States to Uruguay and has a specialised diet of gastropod mollusks, more specifically Pomacea sp. (Perry, 1811) (Tanaka et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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Foraging activity of the snail kite, Rostrhamus sociabilis (Aves: Accipitridae) in wetlands of southern Brazil

et al. 2013

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Helminth component community of the paradoxal frog Pseudis platensis Gallardo, 1961 (Anura: Hylidae) from south-eastern Pantanal, Brazil

2010

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The importance of understanding the role of parasites in ecosystems and the structure of parasite communities was addressed by studying the helminth component community of the paradox frog Pseudis platensis. Thirty-two specimens of P. platensis were collected in the south-eastern Pantanal, State of Mato Grosso do Sul, Brazil, in March 2006 and April 2008, then surveyed for helminth parasites. The component community was composed of eight species: the trematodes Catadiscus propinquus, Catadiscus sp., Glypthelmins palmipedis, two metacercariae of undetermined species, the nematodes Cosmocerca podicipinus and Rhabdias sp., and an encysted larva. Catadiscus sp. dominated in the community with high prevalence (85.4%) and Berger Parker Index (0.75). Glypthelmins palmipedis was the second most prevalent and abundant species, while C. podicipinus and Rhabdias sp. were each found in only one host specimen. The high abundance of digeneans may be explained by the aquatic lifestyle of P. platensis. The helminth species found in this study were reported to infect other host species, corroborating the hypothesis that amphibian parasite communities are composed of generalist species. Pseudis platensis is a new host record for C. propinquus, C. podicipinus, and Rhabdias sp.

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Freshwater gastropods as an important group for studying the impact of inter- and intra-specific chemical communication on aquatic community dynamics

Kirsch

2022

Aquat Ecol

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Habitat structure effects on size selection of snail kites (Rostrhamus sociabilis) and limpkins (Aramus guarauna) when feeding on apple snails (Pomacea spp.)

Cited by 25 publications

References 23 publications

Foraging activity of the snail kite, Rostrhamus sociabilis (Aves: Accipitridae) in wetlands of southern Brazil

Foraging activity of the snail kite, Rostrhamus sociabilis (Aves: Accipitridae) in wetlands of southern Brazil

Helminth component community of the paradoxal frog Pseudis platensis Gallardo, 1961 (Anura: Hylidae) from south-eastern Pantanal, Brazil

Freshwater gastropods as an important group for studying the impact of inter- and intra-specific chemical communication on aquatic community dynamics

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