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  • Using citizen science data to inform marine debris research, management and policy at multiple scales
    (2023) Gacutan, Jordan
    Thesis
    Shifting patterns in consumption and the inadequate disposal of wastes has led to the escape of anthropogenic debris into the marine environment. The growing volume of debris, both within and entering coastal and marine areas, has prompted global concern over the risks they may pose to environmental and human health. Responses to curb further entry and address debris already within the environment include several management interventions, informed by policies and legislation. Effective debris management requires an understanding of potential sources, subsequent dispersion and an estimate of the risks posed to habitats and biological assemblages, which could be attained through environmental monitoring. Monitoring across relevant spatio-temporal scales, however, is often outside the reach of formal government and research programs and there is a growing recognition of the role citizen science data may play in debris management and decision making. This thesis aims to bridge environmental monitoring with policy and decision making, combining citizen science with other data into an evidence-base for management. The thesis assesses several citizen science datasets from a local to Federal scale to identify debris trends and their drivers (Local: four estuaries; State: Queensland; Federal: Australia). Further, I combine expert elicitation and empirical debris data to assess the risk posed by debris. I provide a framework for linking debris identified within the environment to economic sectors, as part of a formal accounting framework. The thesis also provides methodological guidance to refine citizen science sampling during monitoring programs, to improve the accuracy and reliability of resulting datasets. Through careful application and consideration of data quality, citizen science data could be used to supplement formal monitoring efforts to better understand and address the challenge of marine debris. This thesis advances the role of citizen science beyond environmental monitoring to inform management efforts at scale.