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Effects of Sex, Handedness, and Additional Morphological Features on the Chela Crushing Force of Callinectes Sapidus

Title: The Effects of Sex, Handedness, and Additional Morphological Features on the Chela Crushing Force of Callinectes Sapidus.
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Name(s): Martin, Drew Michael, author
Type of Resource: text
Genre: Text
Bachelor Thesis
Date Issued: 2017-04-27
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: This study investigated the relationships between the brachyuran Callinectes sapidus chela bite force and morphological features, consisting of carapace width, propodus length, propodus width, propodus height, and area of the adductor apodeme. Over the course of about seven months, Atlantic blue crabs were collected and observed for morphometric measurements and other characteristics, such as sex and handedness. In addition, chela bite force was quantified for each claw using a bite force transducer. Using single linear regression analyses and the Akaike information criterion (AIC), the relationships of chela crushing force and morphological features were examined. When the maximum force values and the morphological values of both crusher and cutter chelae were combined within the same dataset, propodus height was determined to have the strongest correlation with maximum crushing force. However, when data from crusher and cutter chelae were examined separately, the best predictor of maximum crushing force was found to be propodus width. Analysis of covariance (ANCOVA) statistics were utilized to determine whether maximum crushing forces significantly differed between right and left handed crabs, crusher and cutter chelae, and males and females. Force did not significantly differ between male and female chelae of the same propodus width, but did significantly differ between crusher and cutter chelae. There was a significant interaction between handedness and claw type (P < 0.001); right-handed crabs generated higher crushing claw force; handedness was not apparent in cutter claws. All C. sapidus reared individuals have been previously found to exhibit a right-handed crusher and left-handed cutter layout; however, when the crusher is lost, the left cutter transitions to a new crusher. The results of the significant interaction of chela type and handedness suggests that transitioned crushers exert a lesser force than an original right-handed crusher of the same size. The largest chela bite force recorded in this study was a considerable 291.62 Newtons of force, exceeding any maximum crushing force measurements documented in previous literature and establishing a new upper limit of the crushing force C. sapidus could produce.
Identifier: FSU_libsubv1_scholarship_submission_1493334856 (IID)
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_scholarship_submission_1493334856
Owner Institution: FSU

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Martin, D. M. (2017). The Effects of Sex, Handedness, and Additional Morphological Features on the Chela Crushing Force of Callinectes Sapidus. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_scholarship_submission_1493334856