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Framework for multi-stressor physiological response evaluation in amphibian risk assessment and conservation
Citation:
Awkerman, J., D. Glinski, Matt Henderson, R. Van Meter, AND Tom Purucker. Framework for multi-stressor physiological response evaluation in amphibian risk assessment and conservation. Frontiers in Ecology and Evolution. Frontiers, Lausanne, Switzerland, 12:1336747, (2024). https://doi.org/10.3389/fevo.2024.1336747
Impact/Purpose:
Evaluation of pesticide impacts in amphibian populations is complicated by multiple ubiquitous stressors affecting species globally. Additionally exposure routes and stressor effects can vary throughout the biphasic life cycle of anuran amphibians. Here we examine the physiological impacts of various common stressors in an ecologically relevant framework, identifying them according to life stage impacted and anticipated organismal response. This overview provides a means of evaluating multi-stressor impacts at crucial life cycle phases and prioritizing conservation management responses relative to life history and ecological vulnerabilities of amphibian species.
Description:
Controlled laboratory experiments are often performed on amphibians to establish causality between stressor presence and an adverse outcome. However, in the field, identification of lab-generated biomarkers from single stressors and the interactions of multiple impacts are difficult to discern in an ecological context. The ubiquity of some pesticides and anthropogenic contaminants results in potentially cryptic sublethal effects or synergistic effects among multiple stressors. Although biochemical pathways regulating physiological responses to toxic stressors are often well-conserved among vertebrates, different exposure regimes and life stage vulnerabilities can yield variable ecological risk among species. Here we examine stress-related biomarkers, highlight endpoints commonly linked to apical effects, and discuss differences in ontogeny and ecology that could limit interpretation of biomarkers across species. Further we identify promising field-based physiological measures indicative of potential impacts to health and development of amphibians that could be useful to anuran conservation. We outline the physiological responses to common stressors in the context of altered functional pathways, presenting useful stage-specific endpoints for anuran species, and discussing multi-stressor vulnerability in the larger framework of amphibian life history and ecology. This overview identifies points of physiological, ecological, and demographic vulnerability to provide context in evaluating the multiple stressors impacting amphibian populations worldwide for strategic conservation planning.
URLs/Downloads:
DOI: Framework for multi-stressor physiological response evaluation in amphibian risk assessment and conservation