An Exploration of Drivers of Behavioural and Morphological Laterality and Expensive Tissues in Chinook Salmon (Oncorhynchus Tshawytscha)
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University of Windsor Scholarship at UWindsor Electronic Theses and Dissertations Theses, Dissertations, and Major Papers 2018 An Exploration of Drivers of Behavioural and Morphological Laterality and Expensive Tissues in Chinook Salmon (Oncorhynchus tshawytscha) Mallory L. Wiper University of Windsor Follow this and additional works at: https://scholar.uwindsor.ca/etd Recommended Citation Wiper, Mallory L., "An Exploration of Drivers of Behavioural and Morphological Laterality and Expensive Tissues in Chinook Salmon (Oncorhynchus tshawytscha)" (2018). Electronic Theses and Dissertations. 7407. https://scholar.uwindsor.ca/etd/7407 This online database contains the full-text of PhD dissertations and Masters’ theses of University of Windsor students from 1954 forward. These documents are made available for personal study and research purposes only, in accordance with the Canadian Copyright Act and the Creative Commons license—CC BY-NC-ND (Attribution, Non-Commercial, No Derivative Works). Under this license, works must always be attributed to the copyright holder (original author), cannot be used for any commercial purposes, and may not be altered. Any other use would require the permission of the copyright holder. Students may inquire about withdrawing their dissertation and/or thesis from this database. For additional inquiries, please contact the repository administrator via email ([email protected]) or by telephone at 519-253-3000ext. 3208. AN EXPLORATION OF DRIVERS OF BEHAVIOURAL AND MORPHOLOGICAL LATERALITY AND EXPENSIVE TISSUES IN CHINOOK SALMON (ONCORHYNCHUS TSHAWYTSCHA) by Mallory L. Wiper A Dissertation Submitted to the Faculty of Graduate Studies through the Department of Biological Sciences in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy at the University of Windsor Windsor, Ontario, Canada 2018 © 2018 Mallory L. Wiper AN EXPLORATION OF DRIVERS OF BEHAVIOURAL AND MORPHOLOGICAL LATERALITY AND EXPENSIVE TISSUES IN CHINOOK SALMON (ONCORHYNCHUS TSHAWYTSCHA) By Mallory L. Wiper APPROVED BY: __________________________________________________ G. Nevitt, External Examiner University of California, Davis __________________________________________________ D. Heath Great Lakes Institute for Environmental Research __________________________________________________ C. Semeniuk Department of Biological Sciences __________________________________________________ B. Zielinski Department of Biological Sciences __________________________________________________ D. Higgs, Advisor Department of Biological Sciences 8 December, 2017 DECLARATION OF CO-AUTHORSHIP / PREVIOUS PUBLICATION I. Co-Authorship I hereby declare that this dissertation incorporates material that is the result of joint research, as follows: Outside of the introductory and conclusions chapters, this dissertation incorporates the result of several joint research collaborations. Chapter 2 of the dissertation was co- authored with Dr. Sarah Lehnert, and Dr. Daniel Heath; all work was carried out under the supervision of Dr. Dennis Higgs. The primary contributions, data analysis, interpretation, and writing were performed by the author. The main contribution of Dr. Sarah Lehnert was through genetic analyses to obtain heterozygosity estimates for groups of fish, as well as providing helpful feedback on drafts of the manuscript. Dr. Daniel Heath also provided feedback on early versions of the second data chapter prior to submission for publication. Chapter 3 was designed, analyzed and written by the author under the supervision of and in collaboration with Dr. Dennis Higgs. Chapter 4 was a collaboration between the author, Ms. Shawna L. Semple and Dr. Dennis Higgs. All collaborators worked on processing of the fish used for analysis in this chapter. Ms. Semple’s primary contribution was through running genetic analyses on fin clips to determine heterozygosity estimates for each fish population. Analysis and interpretation of data on laterality and expensive tissue output, as well as writing of the manuscript were done by the author. Finally, chapter 5 was a joint collaboration of Ms. Jessica Mayrand, Dr. Christina Semeniuk, and Dr. Dennis Higgs. Ms. Mayrand and Dr. Semeniuk provided some of the fish from the 2014 and all fish from the 2015 year, including on site processing and transport to the University of Windsor. Ms. Mayrand helped with brain iii dissections and weighing. All writing, analysis and interpretation of results were carried out by the author. I am aware of the University of Windsor Senate Policy on Authorship and I certify that I have properly acknowledged the contribution of other researchers to my dissertation, and have obtained written permission from each of the co-author(s) to include the above material(s) in my dissertation. I certify that, with the above qualification, this dissertation, and the research to which it refers, is the product of my own work. II. Previous Publication This dissertation includes two original papers that have been previously published/submitted for publication in peer reviewed journals, as follows: Dissertation Publication title/full citation Publication status* Chapter Chapter 1 Wiper, M. (2017). Evolutionary and Published mechanistic drivers of laterality: A review and new synthesis. Laterality, 22 (6), 740- 770. doi: 10.1080/1357650X.2017.1291658 Chapter 2 Neutral genetic variation in adult Chinook Published salmon (Oncorhynchus tshawytscha) effects brain-to-body trade-off and brain laterality. Royal Society Open Science, 4 (12), 170989. I certify that I have obtained written permission from the copyright owner(s) to include the above published material(s) in my dissertation. I certify that the above material describes work completed during my registration as a graduate student at the University of Windsor. iv III. General I declare that, to the best of my knowledge, my dissertation does not infringe upon anyone’s copyright nor violate any proprietary rights and that any ideas, techniques, quotations, or any other material from the work of other people included in my dissertation, published or otherwise, are fully acknowledged in accordance with the standard referencing practices. Furthermore, to the extent that I have included copyrighted material that surpasses the bounds of fair dealing within the meaning of the Canada Copyright Act, I certify that I have obtained a written permission from the copyright owner(s) to include such material(s) in my dissertation. I declare that this is a true copy of my dissertation, including any final revisions, as approved by my dissertation committee and the Graduate Studies office, and that this dissertation has not been submitted for a higher degree to any other University or Institution. v ABSTRACT Specific hypotheses have been put forth to help explain and guide further studies of patterns of brain or body growth, as well as lateralized outcomes in fishes. In terms of laterality, what I refer to as the genetic variation and laterality hypothesis has been proposed, stating that there is an inverse relationship between the genetic variation of an organism and measured laterality. The expensive tissue hypothesis, on the other hand, has been proposed as an explanation of differences in brain size, stating that for increased brain growth there must be a compensatory trade-off with other ‘expensive’ tissues. In the present dissertation I have used a salmonid species, Chinook salmon (Oncorhynchus tshawytscha), to explore both the differential investment into brain and body growth, and drivers behind morphological and behavioural laterality. In the first data chapter, as an examination of the genetic variation and laterality hypothesis, I investigate how four different ‘inbreeding levels’ affect morphological laterality of the hemispheres of two main brain regions, the optic tectum and cerebellum. As well, I examine how fish in the ‘inbreeding levels’ differ on a brain-to-body ratio measure as a test of how genetic background might affect expensive tissue investment. In the second data chapter, I use juvenile salmon of six different genetic backgrounds, three domestic and three outcrosses, as well as a manipulation of flow direction (clockwise or counter-clockwise) in the rearing barrels of the fish, to investigate the genetic background, environmental, and gene-by-environment (GxE) interaction effects on both behavioural (C-start; mirror inspection) and morphological (brain; whole eye) laterality. The third chapter examines the effect of population differentiation of seven Chinook populations on morphological brain laterality, again, as an examination of the genetic variation and laterality hypothesis. vi In this chapter I also looked at the differences between populations on the expensive tissue trade-offs of the brain and the body, the brain and the gut and the gut and the body. Finally, in the fourth data chapter I examine the brain-to-body trade-off on six populations of Chinook salmon over three years: 2014, 2015 and 2016. As a whole, the laterality results demonstrate that there is some genetic effect on morphological laterality of the brain hemispheres, but not following the pattern suggested by the genetic variation and laterality hypothesis. From behavioural examinations I note that the manipulation of flow direction and the GxE interaction show the most significant effects on laterality. Results of expensive tissue trade-offs show that there is differential investment into the brain versus the body in Chinook salmon, and this investment