Title

Determining the predictors of crawling speed in the snail Helix aspersa

Date

5-28-2015 2:00 PM

End Time

28-5-2015 4:00 PM

Location

Werner University Center (WUC) Pacific Room

Department

Biology

Session Chair

Ava Howard

Session Chair

Jeffrey Snyder

Session Title

Research in the Biological Sciences

Faculty Sponsor(s)

Mike Baltzley

Presentation Type

Poster session

Abstract

Across modes of locomotion, body size and speed of locomotion are well correlated. Body size and crawling speed are also thought to be correlated in terrestrial snails, but existing data is ambiguous. We tested this hypothesis by examining the relationship between foot length and crawling speed in Helix aspersa and examining the relationships between crawling speed and foot length to width ratio, body weight, shell size, wavelength, and frequency. We recorded crawling on both horizontal and vertical surfaces. We did not find a correlation between foot length and speed. We found there was a correlation between frequency and speed both on vertical and horizontal surfaces. Weight and shell length had no correlation with speed when snails were crawling horizontally, but we found a negative correlation when crawling vertically. Interestingly, we found a positive correlation between wavelength and foot length for crawling on both vertical and horizontal surfaces. We also found a negative correlation between wave frequency and foot length for vertical crawling. This suggests that foot length does not predict crawling speed. There may be a trade-off between wavelength and frequency on vertical surfaces; as foot length and wave lengths increase, the frequency of waves decreases, thus overall crawling speed does not change.

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May 28th, 2:00 PM May 28th, 4:00 PM

Determining the predictors of crawling speed in the snail Helix aspersa

Werner University Center (WUC) Pacific Room

Across modes of locomotion, body size and speed of locomotion are well correlated. Body size and crawling speed are also thought to be correlated in terrestrial snails, but existing data is ambiguous. We tested this hypothesis by examining the relationship between foot length and crawling speed in Helix aspersa and examining the relationships between crawling speed and foot length to width ratio, body weight, shell size, wavelength, and frequency. We recorded crawling on both horizontal and vertical surfaces. We did not find a correlation between foot length and speed. We found there was a correlation between frequency and speed both on vertical and horizontal surfaces. Weight and shell length had no correlation with speed when snails were crawling horizontally, but we found a negative correlation when crawling vertically. Interestingly, we found a positive correlation between wavelength and foot length for crawling on both vertical and horizontal surfaces. We also found a negative correlation between wave frequency and foot length for vertical crawling. This suggests that foot length does not predict crawling speed. There may be a trade-off between wavelength and frequency on vertical surfaces; as foot length and wave lengths increase, the frequency of waves decreases, thus overall crawling speed does not change.