Behavior of First Instar Nymphs of Edessa meditabunda (F.) (Hemiptera: Pentatomidae) on the Egg Mass
Keywords:
Insecta, Pentatomidae, brownwinged stink bug, egg mass, nymph behavior, symbiont acquisition, defenseAbstract
Laboratory studies were conducted on the behavior and time budget of first instar nymphs of the brown-winged stink bug [Edessa meditabunda (F.) (Heteroptera: Pentatomidae)] from egg emergence to their final position adjacent to the egg shells (chorions). Results indicated that right after emergence the nymph stays on the top of each chorion for about 3 min; the mean number of chorions or eggs visited by each nymph was 7.8 before moving off the shells or eggs and positioning itself adjacent to them. The total time required for from emergence of each nymph to its final position adjacent to the chorions was ca. 25 min. All nymphs relocated from on top of the egg mass to a position in which they faced it. This behavior of moving on to the chorions or eggs and positioning adjacent to them is speculated to be related to possible acquisition of symbionts from the surfaces of the chorions and to the defense of the egg mass.
Estudos laboratoriais foram conduzidos sobre o comportamento e a alocação do tempo de ninfas de primeiro instar do percevejo asa marrom, Edessa meditabunda (F.) (Heteroptera: Pentatomidae) da emergência até o posicionamento final ao redor das cascas dos ovos (córions). Os resultados indicaram que logo após a emergência as ninfas ficaram sobre cada córion ou ovo por cerca de 3 minutos; o número médio de córions/ovos visitados por cada ninfa foi de 7,8 unidades, antes de se deslocarem e se posicionarem ao redor dos mesmos. O tempo total da emergência até o posicionamento final ao redor dos córions foi cerca de 25 minutos. Todas as ninfas se posicionaram ao redor e voltadas para os córions. Esses comportamentos de se movimentarem sobre os córions ou ovos e estacionarem ao redor dos mesmos podem estar relacionados com a aquisição de simbiontes e com defesa.
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