John Wiedenmann
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View article: Trends in Area of Occurrence and Biomass of Fish and Macroinvertebrates on the Northeast U.S. Shelf Ecosystem
Trends in Area of Occurrence and Biomass of Fish and Macroinvertebrates on the Northeast U.S. Shelf Ecosystem Open
Climate change can affect the habitat of marine species and hence their persistence and adaptation. Trends in area of occurrence and population biomass were examined for 177 fish and macroinvertebrates resident to the Northeast U.S. Contin…
View article: Harvest control rules used in US federal fisheries management and implications for climate resilience
Harvest control rules used in US federal fisheries management and implications for climate resilience Open
Climate change is altering the productivity of marine fisheries and challenging the effectiveness of historical fisheries management. Harvest control rules, which describe the process for determining catch limits in fisheries, represent on…
How consistent is the advice from stock assessments? Empirical estimates of inter‐assessment bias and uncertainty for marine fish and invertebrate stocks Open
Fishery management frequently involves precautionary buffering for scientific uncertainty. For example, a precautionary buffer that scales with scientific uncertainty is used to calculate the acceptable biological catch downward from the o…
Coherence and potential drivers of stock assessment uncertainty in Northeast US groundfish stocks Open
Failure to account for the impacts of climate and ecosystem change on stock dynamics can introduce uncertainty to stock assessments that can make meeting the objective of sustainable fisheries management challenging. The increased prevalen…
Data-rich but model-resistant: an evaluation of data-limited methods to manage fisheries with failed age-based stock assessments Open
Age-based stock assessments are sometimes rejected by review panels due to large retrospective patterns. When this occurs, data-limited approaches are often used to set catch advice, under the assumption that these simpler methods will not…
View article: Harvest control rules used in U.S. federal fisheries management and implications for climate resilience
Harvest control rules used in U.S. federal fisheries management and implications for climate resilience Open
Climate change is altering the productivity of marine fisheries and challenging the effectiveness of historical fisheries management. Harvest control rules, which describe the process for determining catch limits in fisheries, represent on…
Evaluation of natural mortality of an unfished gastropod ( <i>Buccinum undatum</i> ) population using statolith age‐frequency data in the southern Mid‐Atlantic Bight Open
Natural mortality estimates of harvested stocks are key parameters used in stock assessments to aid in understanding the dynamics of populations, but these estimates are difficult to obtain and have a high degree of uncertainty. Data from …
Environmental drivers of golden tilefish (<i>Lopholatilus chamaeleonticeps</i>) commercial landings and catch‐per‐unit‐effort Open
We explored a range of potential low and high‐frequency environmental drivers of fishery production (landings) and catch‐per‐unit‐effort (CPUE) for northern and southern stocks of golden tilefish ( Lopholatilus chamaeleonticeps ), a stenot…
Response to Comment on “Impacts of historical warming on marine fisheries production” Open
Szuwalski argues that varying age structure can affect surplus production and that recruitment is a better metric of productivity. We explain how our null model controlled for age structure and other processes as explanations for the tempe…
Impacts of historical warming on marine fisheries production Open
Accounting for a warming ocean Fisheries provide food and support livelihoods across the world. They are also under extreme pressure, with many stocks overfished and poorly managed. Climate change will add to the burden fish stocks bear, b…
Valuing changes in frequency of fish stock assessments Open
Updating stock assessments frequently and ensuring that the most recent fishery-dependent and -independent data are included is a costly endeavor. We use a management strategy evaluation for the mid-Atlantic summer flounder (Paralichthys d…
Could recent overfishing of New England groundfish have been prevented? A retrospective evaluation of alternative management strategies Open
We conducted a retrospective evaluation of alternative management strategies for stocks in the New England groundfish complex that have had recent history of target catches being set above the level that defines overfishing. In many cases …
An evaluation of acceptable biological catch (ABC) harvest control rules designed to limit overfishing Open
In this paper we developed a simulation model to evaluate a range of acceptable biological catch (ABC) control rules to determine their relative performance at achieving common fishery management objectives. We explored a range of scenario…