Oxygen, metabolism, and population growth across marine fishes

Resource type
Thesis type
(Thesis) M.Sc.
Date created
2023-05-19
Authors/Contributors
Abstract
The maximum intrinsic rate of population increase (rmax) estimates population growth at low abundance, and varies with size, temperature, and depth, suggesting a metabolic basis for population dynamics. Additionally, recent advances in aquatic ecophysiology have highlighted that oxygen supply constrains metabolic traits. Yet, little is understood of how rmax relates to metabolic rate across fishes, and how both are shaped by environmental oxygen. In this thesis, I conducted a comparative analysis of metabolic rate, rmax, and environmental oxygen for sharks and teleosts. First, I investigated the relationship between metabolic rate and rmax, finding that species with lower metabolic rates also had lower rmax. Next, I tested how metabolic rate and rmax are related to environmental oxygen, and found that both increased with oxygen availability. My findings support that species with slower metabolism (e.g., sharks, or low-oxygen inhabitants) exhibit slower population growth, and hence are more intrinsically sensitive to overfishing.
Document
Extent
108 pages.
Identifier
etd22515
Copyright statement
Copyright is held by the author(s).
Permissions
This thesis may be printed or downloaded for non-commercial research and scholarly purposes.
Supervisor or Senior Supervisor
Thesis advisor: Dulvy, Nicholas
Language
English
Member of collection
Download file Size
etd22515.pdf 4.14 MB

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