Forrageamento de aranhas de teia orbicular : influencia do tamanho da presa e local de contato na teia

AUTOR(ES)
DATA DE PUBLICAÇÃO

1993

RESUMO

Tbe foraging behavior of tbe orb-weaving spiders Micrathena nigrichelis (Araneidae), with a vertical orb and Leucauge sp. (Tetragnathidae), with an inclined web -(458) was studíed. Stimulations witb a tunning fork were done, to test the hipothesis that the assimetry of tbe webs can be explained by temporal parameters of the predatory response of spiders (functional explanation). The tunning fork (for both species) and flies (only for M. nigrichelis) touched the webs at different distances from tbe orb refuge. The assimetry of the webs studied doesn t admitted the functional explanation. On the stimulations with tunning fork, the attack latency increased with the distance from the refuge. The attack latency of M. nigrichelis depends on the size of the prey that hits the web. Bigger prey (Ceratitis capitata) elicit attack in comparable times, independent of the place of the web bitted; smaller prey (Drosophila melanogaster) elicit delayed responses, wich increased with the distance from the orb web refuge. Very fast orb web spiders (Leucauge sp.) estimate the prey quality only at the web refuge; they don t pause when running to the prey. Slower spiders (M. nigrichelis) can evaluate the stimulus generated by the prey at the web refuge and when running to the prey, too; they can pause in their way to the prey

ASSUNTO(S)

aracnideo comportamento animal aranha

ACESSO AO ARTIGO

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