Senior Honors Projects, 2010-current

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Date of Award

Spring 2018

Document Type

Thesis

Degree Name

Bachelor of Science (BS)

Department

Department of Biology

Advisor(s)

Corey L. Cleland

Idelle Cooper

Stephanie Stockwell

Abstract

Insects respond to aversive stimuli such as wind, looming and heat by escaping in a direction opposite the stimuli. Spiders have 8 legs, which offers the spider more gait options for escape than insects, which have 6 legs. However, there are few published studies on the escape response of spiders, and there is no information that shows how location or direction of the stimulus will affect escape patterns. Therefore, the specific goal of my research was to determine the relationship between the stimulus location and direction of response in two species of spider – Regal Jumping spiders (Phidippus regius) and juvenile Chilean Rose tarantulas (Grammostola rosea) - for heat stimuli delivered to the spider’s eight tarsi (legs). Results show that spiders will always move away from the heat stimulus. Additionally, spiders will translate (movement of the center of mass without turning) almost directly away from the stimulus without turning. The initial position of the leg does not affect response, demonstrating that there is no proprioceptive feedback (feedback on where the body is in space) when exposed to aversive heat stimuli.

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