Performance metrics for alternative management strategies for gray seal-commercial fishery interactions in the Northwest Atlantic

2021 ◽  
Vol 243 ◽  
pp. 106060
Author(s):  
André E. Punt ◽  
John R. Brandon ◽  
Douglas P. DeMaster ◽  
Paula T. Moreno
Keyword(s):  
Performance Metrics ◽  
Management Strategies ◽  
Commercial Fishery ◽  
Gray Seal ◽  
Northwest Atlantic ◽  
Alternative Management ◽  
Fishery Interactions

scholarly journals Unusually persistent complainants

2004 ◽  
Vol 184 (4) ◽  
pp. 352-356 ◽  
Author(s):  
Grant Lester ◽  
Franzcp Beth Wilson ◽  
Lynn Griffin ◽  
Paul E. Mullen
Keyword(s):  
Early Detection ◽  
Management Strategies ◽  
Control Group ◽  
Social Fabric ◽  
Alternative Management

BackgroundQuerulous paranoia may have disappeared from the psychiatric literature, but is it flourishing in modern complaints organisations and the courts? Aims To investigate the unusually persistent complainants who lay waste to their own lives and place inordinate demands and stress on complaints organisations.MethodComplaints officers completed questionnaires on both unusually persistent complainants and matched controls.ResultsPersistent complainants (distinguished by their pursuit of vindication and retribution) consumed time and resources and resorted to both direct and veiled threats. Attempts to distinguish these people from a control group on the basis of the manner in which their claims were initially managed failed.ConclusionsPersistent complainants' pursuit of vindication and retribution fits badly with complaints systems established to deliver reparation and compensation. These complainants damaged the financial and social fabric of their own lives and frightened those dealing with their claims. The study suggests methods of early detection and alternative management strategies.

Dynamic modelling of multispecies fisheries for consensus building and management

1996 ◽  
Vol 23 (4) ◽  
pp. 332-342 ◽  
Author(s):  
Matthias Ruth ◽  
James Lindholm
Keyword(s):  
Driving Forces ◽  
Atlantic Cod ◽  
Management Strategies ◽  
Dynamic Modelling ◽  
Mesh Size ◽  
Equilibrium Analysis ◽  
Fish Populations ◽  
Georges Bank ◽  
Alternative Management ◽  
Management Measures

SummaryMany factors influence the dynamics of fisheries and feedback mechanisms amongst these factors are poorly understood. The ecological systems are too large and complex to conduct controlled experiments and economic adjustments to changes in fish populations defy traditional equilibrium analysis. New modelling approaches are required to identify the driving forces behind the dynamics of exploited fish populations, assess likely consequences of alternative management measures, and achieve consensus among stakeholders.We present an interdisciplinary modelling approach that can be used easily to assess dynamic consequences of alternative assumptions for certain key biological and economic parameters, and incorporates the input of various stakeholder groups in the fishery. Contributions of scientists, economists and managers to the model can be augmented with contributions from the fisherfolk.Our approach is illustrated by a dynamic computer model capturing the interactions of three demersal fish species on Georges Bank, namely Atlantic Cod (Gadus morhua), Haddock (Melanogramus aeglefimts) and Pollack (Pollachius virens), population sizes of which are assumed to be density-dependent for the purposes of the model and are significantly affected by management decisions. The model addresses how management measures for one species influence the population dynamics of other commercially exploited species. Various scenarios are run to explore the implications of viable management strategies under alternative assumptions on the driving forces behind complex ecological-economic processes. The analyses indicate that neither small reductions in effort nor mesh size increases are likely to prevent the further demise of the Georges Bank ground fisheries, and, in fact, stocks of the three targeted species may decline. Alternative management measures seem to be necessary to prevent collapse, and might include various strategies, such as effort controls and mesh size reductions, in conjunction with a dramatic change in fishing technology. The assessment and viability of alternative management measures in turn require that consensus is generated among stakeholders about data and models.

scholarly journals The evaluation of two management strategies for the Gulf of Alaska walleye pollock fishery under climate change

2009 ◽  
Vol 66 (7) ◽  
pp. 1614-1632 ◽  
Author(s):  
Z. Teresa A’mar ◽  
André E. Punt ◽  
Martin W. Dorn
Keyword(s):  
Climate Change ◽  
Management Strategy ◽  
Management Strategies ◽  
Gulf Of Alaska ◽  
Walleye Pollock ◽  
Reference Level ◽  
Climate Indices ◽  
Management Performance ◽  
Intergovernmental Panel ◽  
Alternative Management

Abstract A’mar, Z. T., Punt, A. E., and Dorn, M. W. 2009. The evaluation of two management strategies for the Gulf of Alaska walleye pollock fishery under climate change. – ICES Journal of Marine Science, 66: 1614–1632. Management strategy evaluation (MSE) is the process of using simulation testing with feedback to examine the robustness of candidate management strategies to error and uncertainty. The structure of the management strategy can be selected to attempt to satisfy desired (but conflicting) management objectives. MSE was used to assess the performance of the current management strategy and an alternative management strategy (the “dynamic B0” strategy) for the fishery for walleye pollock (Theragra chalcogramma) in the Gulf of Alaska (GOA), when age-1 recruitment was driven by climate. The relationships between age-1 abundance and climate indices (and the uncertainties associated with these relationships) were characterized within an age-structured operating model that was fitted to the data for GOA walleye pollock. Projections into the future were based on the fitted relationships and predictions of those indices from the Intergovernmental Panel on Climate Change (IPCC) models, using the current or the alternative management strategy to determine catch limits. Management performance (the ability to leave the stock close to the management reference level and achieve high and stable catches) deteriorated when age-1 recruitment was forced by climate, although stocks were kept near the reference level on average. In addition, the ability to estimate management-related quantities, such as spawning biomass, deteriorated markedly when recruitment was forced by climate. Performance was sensitive to the choice of IPCC dataset and, in particular, estimation and management performance was poorest (outcomes most variable) for the IPCC datasets that led to the greatest variation in recruitment to the fishery. Although basing management on a “dynamic B0” management strategy led to improved management and estimation performance, the magnitude of the improvement was slight.

scholarly journals A Geospatial Framework to Assess Fireline Effectiveness for Large Wildfires in the Western USA

Fire ◽  
2020 ◽  
Vol 3 (3) ◽  
pp. 43 ◽  
Author(s):  
Benjamin M. Gannon ◽  
Matthew P. Thompson ◽  
Kira Z. Deming ◽  
Jude Bayham ◽  
Yu Wei ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Performance Metrics ◽  
Management Strategies ◽  
Evaluation Framework ◽  
Decision Quality ◽  
Future Research ◽  
Relative Level ◽  
Wildfire Management ◽  
Western Usa ◽  
Institutional Learning

Quantifying fireline effectiveness (FLE) is essential to evaluate the efficiency of large wildfire management strategies to foster institutional learning and improvement in fire management organizations. FLE performance metrics for incident-level evaluation have been developed and applied to a small set of wildfires, but there is a need to understand how widely they vary across incidents to progress towards targets or standards for performance evaluation. Recent efforts to archive spatially explicit fireline records from large wildfires facilitate the application of these metrics to a broad sample of wildfires in different environments. We evaluated fireline outcomes (burned over, held, not engaged) and analyzed incident-scale FLE for 33 large wildfires in the western USA from the 2017 and 2018 fire seasons. FLE performance metrics varied widely across wildfires and often aligned with factors that influence suppression strategy. We propose a performance evaluation framework based on both the held to engaged fireline ratio and the total fireline to perimeter ratio. These two metrics capture whether fireline was placed in locations with high probability of engaging with the wildfire and holding and the relative level of investment in containment compared to wildfire growth. We also identify future research directions to improve understanding of decision quality in a risk-based framework.

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