Variação espaço-temporal na atividade forrageira da Saúva (Atta laevigata)
Forest regeneration in abandoned lands of Amazonia can be affected by leaf-cutting ants, since these ants are important predators of the seeds and seedlings of tree species which eventually arrive or emerge in these areas. However, little is known about how rates of seed and seedling predation vary...
| Autor principal: | Vasconcelos, Heraldo Luis de |
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| Grau: | Artigo |
| Idioma: | pt_BR |
| Publicado em: |
Acta Amazonica
2020
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https://repositorio.inpa.gov.br/handle/1/13141 |
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oai:repositorio:1-13141 |
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oai:repositorio:1-13141 Variação espaço-temporal na atividade forrageira da Saúva (Atta laevigata) Spatio- temporal variation in the foraging activity of the leaf-cutting Ant (Atta laevigata) Vasconcelos, Heraldo Luis de Ants Atta Laevigata Amazon Forest Secondary Forest Regeneration Herbivory Formigas Atta Laevigata Herbivoria Amazônia Regeneração Florestal Forest regeneration in abandoned lands of Amazonia can be affected by leaf-cutting ants, since these ants are important predators of the seeds and seedlings of tree species which eventually arrive or emerge in these areas. However, little is known about how rates of seed and seedling predation vary in space and time. With this objective, I established a plot of 80 by 120 m, divided into 10 χ 10 m quadrants, in an abandoned field near Manaus, in Brazilian Amazonia. There were three leaf-cutting ant (Atta laevigata) nests close to this plot. For one year, I determined which plants (tree species only) were attacked by the ants. I also determined the temporal and spatial variation in seed predation. For this, "seed baits" (20 Phaseolus vulgaris seeds in each) were distributed along the plot for one year. Finally, I determined if seedlings (Bellucia imperialis) transplanted into bare soil had a greater chance of being attacked than those transplanted into areas with a dense grass cover. Results show that seed predation activity was spatially aggregated. More predation was observed in the south-east and north-west portions of the plot, generally close to where nests were located. Strong temporal variation in seed predation rates was also observed. The greatest rates were observed around July, while the lowest ones around January. The temporal distribution of attacks on tree seedlings and saplings followed a similar pattern. There was a clear decrease in the number of plants attacked between November and January. The proportion of plants attacked per quadrant varied between 6 and 89%. The number of B. imperialis seedlings attacked did not vary in response to vegetation cover (with or without grass cover), presumably due to the large spatial heterogeneity in A. laevigata foraging activity, which obscured any eventual effect of vegetation cover. Na Amazônia, a regeneração natural da floresta em pastos e cultivos abandonados pode ser afetada pelas saúvas, pois estas são importantes predadoras das plântulas e das sementes das espécies arbóreas que eventualmente ali se estabelecem. Entretanto, pouco se sabe sobre como as chances de uma dada planta ser atacada ou de uma semente ser removida pelas saúvas varia no tempo e no espaço. Com este intuito, estabeleci uma parcela de 80 χ 120 m, subdividida em quadrantes de 10 χ 10m, em um campo abandonado próximo a Manaus. Na periferia desta parcela haviam 3 ninhos da saúva Atta laevigata. Ao longo de 1 ano, determinei quais plantas (das espécies arbóreas somente) foram atacadas pelas formigas. Determinei também como variou a atividade de coleta de sementes por A. laevigata. Para isto utilizei grãos de feijão (Phaseolus vulgaris). Iscas, com cerca de 20 feijões cada, foram distribuídas pela parcela ao longo do ano. Finalmente, determinei se plantas (mudas de Bellucia imperialis) estabelecidas em solo desnudo tinham uma maior chance de serem atacadas do que aquelas estabelecidas em solo com cobertura de gramíneas. Os resultados mostram que a atividade de coleta de sementes foi espacialmente agregada. A maior atividade foi observada nas regiões sudeste e noroeste da parcela, em geral, próximo aos ninhos. Forte variação temporal na coleta de sementes também foi observada. O pico máximo de atividade ocorreu em meados de julho e o de menor atividade em meados de janeiro. A atividade de corte seguiu um padrão similar. Houve uma clara diminuição no número de plantas atacadas entre novembro e janeiro. A proporção de plantas atacadas por parcela variou entre 6 e 89%. A incidência de ataques por saúvas sobre mudas de B. imperialis não variou em função da cobertura vegetal (com ou sem gramíneas). Isto possivelmente em função da forte heterogeneidade espacial na atividade de A. laevigata, que encobriu qualquer efeito devido a cobertura vegetal. 2020-04-24T15:15:02Z 2020-04-24T15:15:02Z 2002 Artigo https://repositorio.inpa.gov.br/handle/1/13141 10.1590/1809-43922002321154 pt_BR Volume 32, Número 1, Pags. 141-154 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Acta Amazonica |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
pt_BR |
| topic |
Ants Atta Laevigata Amazon Forest Secondary Forest Regeneration Herbivory Formigas Atta Laevigata Herbivoria Amazônia Regeneração Florestal |
| spellingShingle |
Ants Atta Laevigata Amazon Forest Secondary Forest Regeneration Herbivory Formigas Atta Laevigata Herbivoria Amazônia Regeneração Florestal Vasconcelos, Heraldo Luis de Variação espaço-temporal na atividade forrageira da Saúva (Atta laevigata) |
| topic_facet |
Ants Atta Laevigata Amazon Forest Secondary Forest Regeneration Herbivory Formigas Atta Laevigata Herbivoria Amazônia Regeneração Florestal |
| description |
Forest regeneration in abandoned lands of Amazonia can be affected by leaf-cutting ants, since these ants are important predators of the seeds and seedlings of tree species which eventually arrive or emerge in these areas. However, little is known about how rates of seed and seedling predation vary in space and time. With this objective, I established a plot of 80 by 120 m, divided into 10 χ 10 m quadrants, in an abandoned field near Manaus, in Brazilian Amazonia. There were three leaf-cutting ant (Atta laevigata) nests close to this plot. For one year, I determined which plants (tree species only) were attacked by the ants. I also determined the temporal and spatial variation in seed predation. For this, "seed baits" (20 Phaseolus vulgaris seeds in each) were distributed along the plot for one year. Finally, I determined if seedlings (Bellucia imperialis) transplanted into bare soil had a greater chance of being attacked than those transplanted into areas with a dense grass cover. Results show that seed predation activity was spatially aggregated. More predation was observed in the south-east and north-west portions of the plot, generally close to where nests were located. Strong temporal variation in seed predation rates was also observed. The greatest rates were observed around July, while the lowest ones around January. The temporal distribution of attacks on tree seedlings and saplings followed a similar pattern. There was a clear decrease in the number of plants attacked between November and January. The proportion of plants attacked per quadrant varied between 6 and 89%. The number of B. imperialis seedlings attacked did not vary in response to vegetation cover (with or without grass cover), presumably due to the large spatial heterogeneity in A. laevigata foraging activity, which obscured any eventual effect of vegetation cover. |
| format |
Artigo |
| author |
Vasconcelos, Heraldo Luis de |
| title |
Variação espaço-temporal na atividade forrageira da Saúva (Atta laevigata) |
| title_short |
Variação espaço-temporal na atividade forrageira da Saúva (Atta laevigata) |
| title_full |
Variação espaço-temporal na atividade forrageira da Saúva (Atta laevigata) |
| title_fullStr |
Variação espaço-temporal na atividade forrageira da Saúva (Atta laevigata) |
| title_full_unstemmed |
Variação espaço-temporal na atividade forrageira da Saúva (Atta laevigata) |
| title_sort |
variação espaço-temporal na atividade forrageira da saúva (atta laevigata) |
| publisher |
Acta Amazonica |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/13141 |
| _version_ |
1787144681691283456 |
| score |
11.653393 |