Efeito do forrageamento de Eciton Burchelli (Hymenoptera, Formicidae) sobre a Araneofauna de liteira em uma floresta tropical de terra firme na Amazônia Central

Vieira, Rosamary Silva; Höfer, Hubert

doi:10.1590/1809-43921998283351

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…Além disso, visitas noturnas á área, mostraram grande número de formigueiros e de formigas em atividade de forrageamento. Alguns estudos mostram que formigas podem influenciar diretamente na diversidade ou abundância das aranhas de determinadas áreas (Vieira & Höfer, 1994;1998;Colef et al, 1992;Bolger et al, 2000).…”

Section: Comparações Entre As áReasunclassified

Composição e diversidae da araneofauna (Araneae) de serapilheira em três florestas urbanas na cidade de São Paulo, São Paulo, Brasil

2005

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Three urban areas were sampled using pitfall traps: Parque da Previdência, Mata da CUASO and Mata do Instituto Butantan. These areas are located in the western region of the city of São Paulo, Brasil. Fifty traps were placed in each area, per season, during one year, totalling 600 traps. A total of 2339 spiders were collected, of which 1569 adults and 770 juveniles. These were separated into 46 morphospecies, belonging to 25 families. The most abundant family was Linyphiidae, with nine morphospecies, followed by Theridiidae and Salticidae, with eight and seven morphospecies, respectively. The most common species were Hahniidae sp.1 and Guaraniella sp.1 in the Parque da Previdência; Linyphiidae sp.1 in the Instituto Butantan's forest and Zoridae sp.2 and Brattia castanea Millidge in the CUASO forest .

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Section: Comparações Entre As áReasunclassified

Composição e diversidae da araneofauna (Araneae) de serapilheira em três florestas urbanas na cidade de São Paulo, São Paulo, Brasil

2005

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“…They forage in and on the leaf litter and are the dominant medium-to-large sized wandering spiders on the ground in most parts of this forest. Vieira & Hofer (1994, 1998 studied swarm-raiding army ants {Eciton burchelli and Labidus praedator) in central Amazonia (100 km north of READ) and concluded that the spiders of the genus Ctenus are among the major prey items of these ants. The effect of army ants on ground-living spiders, including Ctenus, was also discussed by Gasnier, Hofer & Brescovit (1995).…”

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Patterns of Abundance of Four Species of Wandering Spiders (Ctenidae, Ctenus) in a Forest in Central Amazonia

Gasnier

Höfer²

2001

Journal of Arachnology

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We studied spatial and temporal patterns of abundance of Ctenus amphora, C. crulsi, C. manauara and C. villasboasi, four syntopic species of medium-to-large sized wandering spiders that forage on the ground in a neotropical rainforest. We found temporal variation, apparently seasonal, in abundance for two of the four species. The four species are sympatric in the study area, but with very distinct spatial patterns of abundance. Ctenus amphora was more abundant in areas with sandy soil but are also common on clay soils, C. manauara and C. crulsi are the dominant species in areas with clay soil and are infrequent in sandy soils, and C. villasboasi had a more homogenous abundance in the study area. Previous studies suggested that a predator, army ants, could have an important impact on the abundance of these spiders. We estimated the frequency of attacks by army ants using pitfall traps in sandy and clay soil areas. The estimated probability of attack by army ants was higher in areas with clay soil (92% per 3 months), where all species are frequently found, than in sandy soil areas (21%), where C. crulsi and C. manauara were almost absent. However, it is still not clear if predation by army ants is a key factor that facilitates coexistence in clay soils, and this factor can not explain the difference on the dominant species between areas with different soil types. We also discuss the description of spatial patterns of abundance as a simple, but powerful, tool seldom used for preliminary studies on the coexistence of spiders.RESUMO. Nos estudamos padroes espaciais e temporais de abundancia de Ctenus amphora, C. crulsi, C. manauara e C. villasboasi, quatro especies sintopicas de aranhas errantes que forrageiam no chao em uma floresta neotropical umida. Nos encontramos uma variagao temporal, aparentemente sazonal, na abundafancia de duas das quatro especies. As quatro especies sao simpatricas na area de estudo, mas com padroes espaciais de abundancia muito distintos. Ctenus amphora foi mais abundante em areas de solos arenosos, mas tambem foi comum em solos argilosos C manauara e C. crulsi foram as especies domi= nantes em solos argilosos, e foram infreqiientes em solos arenosos, e C. villasboasi teve uma abundancia mais homogenea na area de estudo. Estudos anteriores sugeriram que um predador, formigas de correigao, poderia ter um forte impacto sobre a abundancia destas aranhas. Nos estimamos a freqiiencia de ataques por formigas de correi^ao usando armadilhas de fosso (pitfall traps) em areas de solo arenoso e argiloso. A probabilidade estimada de ataques por formigas de correi^ao foi maior em ^eas de solo argiloso (92% em 3 meses), onde todas as especies sao freqiientemente encontradas, que em solo arenoso (21%), onde C crulsi e C. manauara foram raras. Entretanto, ainda nao esta claro se a preda 9 ao e um fator chave para facilitar a coexistencia em solos argilosos, e este fator nao pode explicar a diferenga de especies dominantes entre as &eas com tipos de solo diferentes. Nos tambem discutimos a descrigao de padr...

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Effects of forest fragmentation on fourCtenusspider populations (Araneae: Ctenidae) in central Amazonia, Brazil

Rego¹,

Venticinque²,

Brescovit³

2007

Studies on Neotropical Fauna and Environment

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Efeito do forrageamento de Eciton Burchelli (Hymenoptera, Formicidae) sobre a Araneofauna de liteira em uma floresta tropical de terra firme na Amazônia Central

Cited by 5 publications

References 7 publications

Composição e diversidae da araneofauna (Araneae) de serapilheira em três florestas urbanas na cidade de São Paulo, São Paulo, Brasil

Composição e diversidae da araneofauna (Araneae) de serapilheira em três florestas urbanas na cidade de São Paulo, São Paulo, Brasil

Patterns of Abundance of Four Species of Wandering Spiders (Ctenidae, Ctenus) in a Forest in Central Amazonia

Effects of forest fragmentation on fourCtenusspider populations (Araneae: Ctenidae) in central Amazonia, Brazil

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