Assessing effects of acclimation temperature on thermal tolerance of stream-type juvenile Chinook salmon (Oncorhynchus tshawytscha) under ecologically relevant temperatures
department or school: Forestry, Faculty of
data provider: DSpace
degree campus: UBCV
creator: Butler, Natalie Ann
issued: 2024-02-06T20:14:59Z
issued: 2024
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: Pacific salmon are now experiencing temperatures in freshwater that can reach or exceed their upper thermal limits. The aims of this thesis are to evaluate the role of acclimation on the Upper Thermal Tolerance (UTL) in stream-type juvenile Chinook salmon (Oncorhynchus tshawytscha), to evaluate how different methods in measuring UTL affect the measured outcome, and determine how acclimation temperature affects post-swim mortality. Both parr and fry life stages were acclimated for two weeks at temperatures spanning present and expected future summer levels (15°C, 18°C, 20°C, 24°C). Using fish from each acclimation temperature, we measured post-swim mortality following an endurance trial (Eswim), whereby swimming fish were exposed to increasing speeds at each temperature, and subsequently returned to their initial acclimation trough and monitored for 48 hours. The effect of acclimation temperature on critical thermal maximum (CTmax) was measured by two means: stationary (CTmax stat) and swimming (CTmax swim). CTmax stat was determined by water evenly heated at 0.3°C/min in a stationary bath, with loss of equilibrium (LOE) as the indicator of CTmax stat. CTmax swim was determined using a swim flume heated at 1°C/30min with fish swimming at a fixed speed of 4 BL/s, and cessation of swimming as the endpoint. Fish acclimated to higher temperatures generally exhibited higher thermal tolerance until 24°C, where fish were not able to acclimate to higher temperatures. Based on CTmax stat trials, parr showed a consistent increase in acclimation up to 24°C, with increasing CTmax temperatures, though in CTmax swim trials, there was a distinct thermal ceiling at that temperature. Fry exhibited a greater sensitivity to increased temperatures, with a drop in CTmax at 24°C for both stationery and swimming trials. There was high post-swim mortality following the 24°C acclimation groups in the Eswim trials in both parr and fry, indicating an upper thermal limit where impaired recovery…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/87415
note: Assessing effects of acclimation temperature on thermal tolerance of stream-type juvenile Chinook salmon (Oncorhynchus tshawytscha) under ecologically relevant temperatures by Natalie Ann Butler BSc, The University of British Columbia, 2020 A THESIS SUBMITTED IN PARTIAL FULLFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Forestry) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) January 2024 © Natalie Ann Butler, 2024 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, a thesis entitled: Assessing effects of acclimation temperature on thermal tolerance of stream-type juvenile Chinook salmon (Oncorhynchus tshawytscha) under ecologically relevant temperatures Submitted by Natalie Ann Butler in partial fulfillment of the requirements for the degree of Master of Science in Forestry Examining Committee: Scott Hinch, Professor, Department of Forest and Conservation Sciences, UBC Supervisor Erika Eliason, Professor, Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara Supervisory Committee Member Colin Brauner, Professor, Department of Zoology, UBC Supervisory Committee Member Jeffrey Richards, Professor, Department of Zoology, UBC Additional Examiner iii Abstract Pacific salmon are now experiencing temperatures in freshwater that can reach or exceed their upper thermal limits. The aims of this thesis are to evaluate the role of acclimation on the Upper Thermal Tolerance (UTL) in stream-type juvenile Chinook salmon (Oncorhynchus tshawytscha), to evaluate how different methods in measuring UTL affect the measured outcome, and determine how acclimation temperature affects post-swim mortality. Both parr and fry life stages were acclimated for two weeks at temperatures spanning present and expected future summer levels (15°C, 18°C, 20°C, 24°C). Using fish from each acclimation tempera…
has type: Thesis/Dissertation
date issued: 2024-05
is shown at: 10.14288/1.0439618
language: eng
degree discipline: Forestry
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Hinch, Scott G.
type: Text
identifier URI: http://hdl.handle.net/2429/87415