Cookies Policy
X
Cookie Policy

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here

The Feeding Behaviour of a Sit-and-Wait Predator, Ranatra Dispar, (Heteroptera: Nepidae): Description of Behavioural Components of Prey Capture, and the Effect of Food Deprivation On Predator Arousal and Capture Dynamics1)

MyBook is a cheap paperback edition of the original book and will be sold at uniform, low price.

Buy this article

Price:
$30.00+ Tax (if applicable)
Add to Favorites

image of Behaviour

[The components in the predatory behaviour of this typical sit-and-wait predator are described. The sequence of components follow a basic pattern, i.e. initial precapture posture, arousal, orientation, capture, consolidation of grip, exploration, injection of venom/enzymes, feeding, discard of prey. When tested with model prey of no nutritional value following increasing periods of fast R. dispar increased the initial exploratory time and the number of exploratory bouts before rejecting the prey. The predators arousal space is elliptical horizontally and almost circular vertically, the distance being greatest in front of the predator and decreasing to the rear. The strike and capture space of R. dispar is restricted to the space anterior to the predator and bounded by approximately 45° either side horizontally and 90° to -45° (315°) vertically. Both the arousal and strike space increase with food deprivation. The period of food deprivation significantly affects the strike distance up to a maximum of about 30 mm after a 120 hour fast. Presentation along some paths evokes more strikes, hits and captures than presentation along others, suggesting that there is an optimum region within the strike space where the capture efficiency is highest. Prey moving along the 0° path in the horizontal plane or either the 0° or 45° path in the vertical plane, evoke the highest number of strikes, and hits in well-fed predators, while the highest capture efficiency occurs when prey are moved on the 0° path. Following longer periods of fasting (> 72 hours) prey moved below the 0° axis (Vertical Plane) along the -45° (315°) path evoke as many strikes as the 0° and 45° paths. Although dynamic, the capture space is limited by the reach of the raptorial legs, there being no lunge or pursuit. The capture efficiency is about 76% and unaffected by food deprivation., The components in the predatory behaviour of this typical sit-and-wait predator are described. The sequence of components follow a basic pattern, i.e. initial precapture posture, arousal, orientation, capture, consolidation of grip, exploration, injection of venom/enzymes, feeding, discard of prey. When tested with model prey of no nutritional value following increasing periods of fast R. dispar increased the initial exploratory time and the number of exploratory bouts before rejecting the prey. The predators arousal space is elliptical horizontally and almost circular vertically, the distance being greatest in front of the predator and decreasing to the rear. The strike and capture space of R. dispar is restricted to the space anterior to the predator and bounded by approximately 45° either side horizontally and 90° to -45° (315°) vertically. Both the arousal and strike space increase with food deprivation. The period of food deprivation significantly affects the strike distance up to a maximum of about 30 mm after a 120 hour fast. Presentation along some paths evokes more strikes, hits and captures than presentation along others, suggesting that there is an optimum region within the strike space where the capture efficiency is highest. Prey moving along the 0° path in the horizontal plane or either the 0° or 45° path in the vertical plane, evoke the highest number of strikes, and hits in well-fed predators, while the highest capture efficiency occurs when prey are moved on the 0° path. Following longer periods of fasting (> 72 hours) prey moved below the 0° axis (Vertical Plane) along the -45° (315°) path evoke as many strikes as the 0° and 45° paths. Although dynamic, the capture space is limited by the reach of the raptorial legs, there being no lunge or pursuit. The capture efficiency is about 76% and unaffected by food deprivation.]

Affiliations: 1: (Department of Entomology, Waite Agricultural Research Institute, University of Adelaide, South Australia 5064

Sign-in

Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Create email alert
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Name:*
    Email:*
    Your details
    Name:*
    Email:*
    Department:*
    Why are you recommending this title?
    Select reason:
     
     
     
     
    Other:
     
    Behaviour — Recommend this title to your library

    Thank you

    Your recommendation has been sent to your librarian.

  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation