Prey capture behavior in three Neotropical armored harvestmen (Arachnida, Opiliones)

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• 作者：Thaiany M. Costa ; Norton F. S. Silva ; Rodrigo H. Willemart
• 关键词：Detection ; Foraging ; Handling ; Prey capture ; Gonyleptidae ; Cosmetidae
• 刊名：Journal of Ethology
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：34
• 期：2
• 页码：183-190
• 全文大小：1,291 KB
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• 作者单位：Thaiany M. Costa (1) (3)
  Norton F. S. Silva (1) (2)
  Rodrigo H. Willemart (1) (2) (3)
  
  1. Laboratório de Ecologia Sensorial e Comportamento de Artrópodes, Escola de Artes, Ciências e Humanidades, Universidade de São Paulo, Rua Arlindo Béttio, 1000, Ermelino Matarazzo, São Paulo, SP, 03828-000, Brazil
  3. Programa de Pós-Graduação em Zoologia, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, 321, Travessa 14, São Paulo, SP, 05508-090, Brazil
  2. Programa de Pós-Graduação em Ecologia e Evolução, Universidade Federal de São Paulo, Campus Diadema, Rua Professor Artur Riedel, 275, Jardim Eldorado, Diadema, SP, 09972-270, Brazil
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Zoology
  Behavioural Sciences
  Animal Ecology
  Evolutionary Biology
  Neurosciences
  
• 出版者：Springer Japan
• ISSN：1439-5444

文摘

Acquiring food requires success in all the distinct phases of foraging, among which are detecting, capturing and handling prey. We have looked at prey detection, capturing and handling in three species of armored harvestmen differing in leg length and pedipalp morphology: Discocyrtus pectinifemur, Heteromitobates discolor and Gryne perlata. We recorded males and females in captivity capturing 0.5- to 0.7-mm-long immature crickets without legs III and provide the first detailed description of prey capture in harvestmen of the suborder Laniatores. We have shown that these three species can detect live prey without touching it but only at close range (<1 cm). The success at the strike phase was: 27.2 % for D. pectinifemur, 50 % for G. perlata and 72.7 % for H. discolor. Combining the probability of detection without contact with that of successful capturing of the two-legged cricket, the success rate of G. perlata, D. pectinifemur and H. discolor were, respectively, 2, 21 and 32 %. Only one cricket escaped from within the pedipalps of the harvestmen (G. perlata, smooth pedipalps). The long-legged H. discolor, which forage in open areas, had a higher success and, after detection, took less time to attack crickets in open areas. Compared to other arachnids, prey detection happens at close range and capture success in Laniatores is low. However, omnivory probably minimizes these limitations in capturing live prey.