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Ecologia de parasit?ides (Diptera: Phoridae) de Atta robusta Borgmeier, 1939 (Hymenoptera: Formicidae) em ambiente de restinga / Ecology of parasitoids (Diptera: Phoridae) of Atta robusta Borgmeier, 1939 (Hymenoptera: Formicidae) in restinga environment.Gomes, Diego da Silva 29 April 2011 (has links)
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Previous issue date: 2011-04-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / The leaf cutter ant Atta robusta Borgmeier, 1939 (Hymenoptera: Formicidae) is an endemic species existent in restinga environment between States of Rio de Janeiro and Esp?rito Santo. However, with the fragmentation of this environment and consequent loss of the native area, owed due mainly to the urban growth, this species takes serious extinction risk, becoming indispensable studies that seek auxiliary in the understanding of your ecology, as the action of parasitoids phorids (Diptera: Phoridae). This work had as main objective to study possible associations of these flies with A. robusta. During the period between June 2009 and October 2010 two restinga environment were studied in the city of Rio de Janeiro: Parque Marapendi and restinga da Marambaia. In each environment they two areas were chosen (with differentiated vegetable composition), an open and more degraded, and another closed, more preserved. In each area nine colonies of A. robusta were chosen, totaling 36 colonies in the four areas of the two environments. Every day of data collection consisted of six hours of observation, divided in eight times of 45 minutes. These observations were made in trails and entrance of the nests, in a consecutive way, always beginning for the entrance nests. In the first ones 15 of each time were to verify the traffic of ants and the 30 remaining minutes, for capture of the phorids that attacked A. robusta. Environmental variables (temperature and humidity) were logged, as well as the attack place (trails and nests entrances). Seventy three phorid flies of two species were collected: Neodohrniphora sp. (46 individuals) and Myrmosicarius sp. (27 individuals). The first one was confirmed as a new species and it was more frequent in more closed restinga areas, while the second, with open areas. The two species attack in trails and entrance of the nests. The number of individuals of Myrmosicarius sp. was influenced negatively with the temperature and positively with the relative humidity of the air. In the case of Neodohrniphora sp. nov., all the regressions relating the number of individuals captured with the studied variables were not significant. The phorid species appear to be linked to specific areas of restinga, in which temperature and humidity are factors limiting the performance of parasitoids Myrmosicarius sp., but do not regulate the behavior of parasitoid Neodohrniphora sp nov. / A formiga cortadeira Atta robusta Borgmeier, 1939 (Hymenoptera: Formicidae) ? uma esp?cie end?mica de ambientes de restinga existentes entre os Estados do Rio de Janeiro e Esp?rito Santo. Por?m, com a fragmenta??o deste ambiente e conseq?ente perda da ?rea nativa, devido principalmente ao crescimento urbano, esta esp?cie corre s?rio risco de extin??o, tornando-se imprescind?veis estudos que visem auxiliar na compreens?o de sua ecologia, como a a??o de for?deos parasit?ides (Diptera: Phoridae). Este estudo teve como objetivo principal estudar poss?veis associa??es destas moscas com A. robusta. Durante o per?odo entre junho de 2009 e outubro de 2010 foram estudados dois ambientes de restinga na cidade do Rio de Janeiro: Parque Marapendi e restinga da Marambaia. Em cada um destes ambientes foram escolhidas duas ?reas (com composi??o vegetal diferenciada), uma aberta e mais degradada, e outra fechada, mais preservada. Em cada ?rea foram escolhidas nove col?nias de A. robusta, totalizando 36 col?nias nas quatro ?reas dos dois ambientes. Cada dia de coleta de dados constou de seis horas de observa??o, divididas em oito tempos de 45 minutos. Estas observa??es foram feitas em trilhas e em olheiros, de forma consecutiva, sempre se iniciando pelos olheiros. Os 15 primeiros minutos de cada tempo foram para verificar o tr?fego de formigas e os 30 minutos restantes, para captura de for?deos que atacavam A. robusta. Vari?veis ambientais (temperatura e umidade) foram anotadas, bem como o local de ataque (trilha e olheiro). Foram coletados 73 for?deos de duas esp?cies: Neodohrniphora sp. nov. (46 indiv?duos) e Myrmosicarius sp. (27 indiv?duos). A primeira esp?cie foi confirmada como uma nova esp?cie e foi mais frequente em ?reas de restinga mais fechadas, enquanto a segunda, em ?reas abertas. As duas esp?cies atacam em trilhas e olheiros. O n?mero de indiv?duos de Myrmosicarius sp. foi influenciado negativamente pela temperatura e positivamente pela umidade relativa do ar. No caso de Neodohrniphora sp. nov., todas as regress?es relacionando o n?mero de indiv?duos capturados com as vari?veis estudadas foram n?o significativas. As esp?cies de for?deos parecem estar associadas a ?reas espec?ficas de restinga, na qual temperatura e umidade s?o fatores limitantes da atua??o dos parasit?ides Myrmosicarius sp., por?m n?o regulam o comportamento parasit?ide de Neodohrniphora sp nov.
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