Graduate Theses & Dissertations

Corticosterone Promotes Development of Cannibalistic Morphology and Inhibits Tissue Regeneration in Axolotls (Ambystoma mexicanum)
Salamanders are capable of tissue regeneration throughout all life-stages, which requires the dedifferentiation of mature cells to regrow lost tissues. Dedifferentiation is promoted by degradation of the extracellular matrix by matrix metalloproteases, as well as lysosomal degradation of intracellular and cell-surface proteins that mark cells as part of a mature lineage. Salamanders are also capable of developing cannibalistic phenotypes, plastic traits that are elicited by environmental stressors that result in elevated circulating glucocorticoid (e.g., corticosterone) levels that underlie many fundamental adaptive changes in morphology. Interestingly, the direct effect of corticosterone on regeneration and the cannibalistic phenotype have yet to be examined. In the present thesis, axolotls (Ambystoma mexicanum) were exposed to exogenous corticosterone and 50% of the distal tail tissue was removed. The effects of high corticosterone levels on matrix metalloprotease (MMP-2, MMP-9) and lysosomal acid phosphatase (LAP) activity were assessed; these are two classes of enzymes which are markers of extracellular matrix and intracellular remodeling during regeneration, respectively. We found that elevated corticosterone levels inhibited tissue regeneration, by prolonging the dedifferentiation phase as indicated by increased LAP and reduced MMP-2 and MMP-9 activity. Elevated corticosterone levels also promoted the cannibalistic morphology and this effect was strongest among smaller individuals. Author Keywords: amphibian, cannibalistic morphology, corticosterone, dedifferentiation, regeneration, stress
Constraints on phenotypic plasticity in response to predation risk
Inducible defenses are plastic responses by an organism to the perception of predation risk. This dissertation focuses on three experiments designed to test the hypothesis that plastic ability is limited by energetic constraints. Chapter 1 provides a general introduction to phenotypic plasticity research and the theoretical costs and limitations affecting the expression of plastic traits. In Chapter 2, I tested the hypothesis that costs of early plasticity may be manifested by a reduced response to risk in later life stages. I found that amphibian embryos are able to detect and respond to larval predators, but that the energetic cost of those plastic responses are not equivalent among behavioural, growth, and morphological traits, and their expression differs between closely-related species. Chapter 3 explicitly examines the relationship between food resource availability and plasticity in response to perceived predation risk during larval development. Food-restricted tadpoles showed limited responses to predation risk; larvae at food saturation altered behaviour, development, and growth in response to predation risk. Responses to risk varied through time, suggesting ontogeny may affect the deployment of particular defensive traits. Chapter 4 examines the influence of maternal investment into propagule size on the magnitude of the plastic responses to predation risk in resulting offspring. I found that females in better body condition laid larger eggs and that these eggs, in turn, hatched into larvae that showed greater morphological plasticity in response to predation risk. Maternal investment can therefore affect the ability of offspring to mount morphological defenses to predation risk. Last, Chapter 5 provides a synthesis of my research findings, identifying specific factors constraining the plastic responses of prey to perceived predation risk. Overall, I found constraints on plastic responses imposed by the current environment experienced by the organism (resource availability), the prior experience of the organism (predator cues in the embryonic environment), and even the condition of the previous generation (maternal body condition and reproductive investment). Together, these findings both provide new knowledge and create novel research questions regarding constraints limiting phenotypic variation in natural populations. Author Keywords: behaviour, inducible defense, Lithobates pipiens, morphometrics, phenotypic plasticity, predation risk

Search Our Digital Collections

Query

Enabled Filters

Filter Results

Date

2010 - 2020
(decades)
Specify date range: Show
Format: 2020/02/24

Author Last Name

Last Name (Other)

Degree Discipline