RESUMEN
A Mata do Krambeck é uma reserva ambiental urbana tropical de importância sócio-ambiental, sendo um dos biomas mais ameaçados do mundo e seus remanescentes somam não mais de 12% da área original, sendo em sua maioria compostos por fragmentos de tamanhos variáveis, em geral pequenos. Um destes fragmentos, chamado Sítio Malícia, foi adquirido pela Universidade Federal de Juiz de Fora para a implantação do Jardim Botânico. Considerando que a Mata do Krambeck representou ao longo dos anos importante refúgio de animais da fauna silvestre regional, pesquisadores têm trabalhado no sentido de conhecer os diversos grupos, sendo este trabalho o primeiro a pesquisar a mirmecofauna. Para isso foram realizadas coletas mensais, durante 12 meses, com a utilização de armadilhas tipo pitfall instaladas em três trilhas no interior da mata. As formigas coletadas foram triadas no Laboratório de Artrópodes da UFJF e identificadas até gênero com o auxílio de chaves dicotômicas. Foram coletadas 4232 formigas, pertencentes aos gêneros Acromirmex, Atta, Camponotus, Cephalotes, Hypoponera, Pachycondila, Pheidole e Solenopsis. Existe uma grande diversidade de formigas no local, o que já era esperado segundo bibliografias analisadas.(AU)
Mata do Krambeck is a tropical urban environmental reserve of socioenvironmental importance, being oneof the most threatened biomes in the world, and its current area is no more than 12% of the original size,composed mostly of fragments with variable length, usually small. One of those fragments, called Sítio Malícia,was acquired by Federal University of Juiz de Fora for the deployment of the Botanical Garden. Considering thatMata do Krambeck represented over the years an important regional wildlife refuge, researchers have beenworking to know its biodiversity, with this work being the first to survey the ants fauna. To do that, sampleswere collected monthly in twelve months, using pitfall traps installed in three tracks inside the forest. The antscollected were screened at the Arthropod Laboratory of the Department of Zoology of UFJF and identified togenera using dichotomous keys. A total of 4232 ants were collected, belonging to the genera Acromirmex, Atta,Camponotus, Cephalotes, Hypoponera, Pachycondila, Pheidole and Solenopsis. There is a great diversity of antson site, which was expected second analyzed bibliographies.(AU)
Asunto(s)
Animales , Hormigas , Biodiversidad , Distribución Animal , FaunaRESUMEN
A Mata do Krambeck é uma reserva ambiental urbana tropical de importância sócio-ambiental, sendo um dos biomas mais ameaçados do mundo e seus remanescentes somam não mais de 12% da área original, sendo em sua maioria compostos por fragmentos de tamanhos variáveis, em geral pequenos. Um destes fragmentos, chamado Sítio Malícia, foi adquirido pela Universidade Federal de Juiz de Fora para a implantação do Jardim Botânico. Considerando que a Mata do Krambeck representou ao longo dos anos importante refúgio de animais da fauna silvestre regional, pesquisadores têm trabalhado no sentido de conhecer os diversos grupos, sendo este trabalho o primeiro a pesquisar a mirmecofauna. Para isso foram realizadas coletas mensais, durante 12 meses, com a utilização de armadilhas tipo pitfall instaladas em três trilhas no interior da mata. As formigas coletadas foram triadas no Laboratório de Artrópodes da UFJF e identificadas até gênero com o auxílio de chaves dicotômicas. Foram coletadas 4232 formigas, pertencentes aos gêneros Acromirmex, Atta, Camponotus, Cephalotes, Hypoponera, Pachycondila, Pheidole e Solenopsis. Existe uma grande diversidade de formigas no local, o que já era esperado segundo bibliografias analisadas.
Mata do Krambeck is a tropical urban environmental reserve of socioenvironmental importance, being oneof the most threatened biomes in the world, and its current area is no more than 12% of the original size,composed mostly of fragments with variable length, usually small. One of those fragments, called Sítio Malícia,was acquired by Federal University of Juiz de Fora for the deployment of the Botanical Garden. Considering thatMata do Krambeck represented over the years an important regional wildlife refuge, researchers have beenworking to know its biodiversity, with this work being the first to survey the ants fauna. To do that, sampleswere collected monthly in twelve months, using pitfall traps installed in three tracks inside the forest. The antscollected were screened at the Arthropod Laboratory of the Department of Zoology of UFJF and identified togenera using dichotomous keys. A total of 4232 ants were collected, belonging to the genera Acromirmex, Atta,Camponotus, Cephalotes, Hypoponera, Pachycondila, Pheidole and Solenopsis. There is a great diversity of antson site, which was expected second analyzed bibliographies.
Asunto(s)
Animales , Biodiversidad , Distribución Animal , Hormigas , FaunaRESUMEN
ABSTRACT During foraging, worker ants are known for making use of many information sources to guide themselves in external environments, especially individual (memory) and social (trail pheromone) information. Both kinds of information act in a synergic way, keeping the foraging process efficient and organized. However, when social and individual information is conflicting face a trail bifurcation, it is necessary to establish a hierarchical order so prioritizing one of them. This study aims to verify which information (social or individual) is prioritized by Acromyrmex subterraneus workers when facing a bifurcation in a Y-trail system. Only one branch of the Y-trail leads to food resource and it had a section covered by filter paper where trail pheromone was deposited by workers. Pheromone deposition was here estimated by worker flow. After an individually marked forager (target-worker) made 1, 3 or 5 trips to the food resource, the filter paper was transferred to the branch which did not lead to the food. The time spent by target workers on branch selection and their right choice (branch with food) frequency were registered. Regardless of the target worker's previous trips to the resource, right choice frequency stood over 70%. In addition, the number of previous trips did not influence the time spent on decision making. However, the higher the flow of workers, the longer the time spent on decision making. By simulating a situation with conflicting information, it was possible to verify that a hierarchical order is established by A. subterraneus, which prioritized individual information (memory).