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Frontiers | Seasonal, Annual, and Decadal Distribution of Three Rorqual Whale Species Relative to Dynamic Ocean Conditions Off Oregon, USA

Whale populations recovering from historical whaling are particularly vulnerable to incidental mortality and disturbance caused by growing ocean industrialization. Several distinct populations of rorqual whales (including humpback, blue, and fin whales) migrate and feed off the coast of Oregon, USA where spatial overlap with human activities are on the rise. Effective mitigation of conflicts requires better foundational understanding of spatial and temporal habitat use patterns to inform conservation management. Based on a year-round, multi-platform distance sampling dataset (2016-2021, 177 survey days, 754 groups observed), this study generated density models to describe and predict seasonal distribution of rorqual whales in Oregon. Phenology analysis of sightings revealed a peak of humpback whale and blue whale density over the Oregon continental shelf in August and September respectively, and higher fin whale density in the winter (December). Additionally, we compared rorqual sighti ....

North Bend , United States , New York , Crescent City , Columbia River , City Of , United Kingdom , Heceta Bank , Cape Blanco , New Zealand , Vancouver Island , Monterey Bay , North West Cape , Western Australia , Hastie Tibshirani , Thysanoessa Spinifera , Salgado Kent , Euphausia Pacifica , Tracy Shaw , Los Angeles , Megaptera Novaeangliae , Pacific Ocean , Eubalaena Glacialis , Alexa Kownacki , J Calambokidis Cascadia Research , Qpi Technology ,

"Area-based management of blue water fisheries: Current knowledge and r" by Ray Hilborn, Vera N. Agostini et al.

The pelagic fisheries beyond the continental shelves are currently managed with a range of tools largely based on regulating effort or target catch. These tools comprise both static and dynamic area-based approaches to include gear limitations, closed areas and bycatch limits. There are increasing calls for additional area-based interventions, particularly expansion of marine protected areas, with many now advocating closing 30% of the oceans to fishing. In this paper, we review the objectives, methods and successes of area-based management of blue water fisheries across objectives related to food production and environmental, social and economic impacts. We also consider the methods used to evaluate the performance of area-based regulations and provide a summary of the relative quality of evidence from alternative evaluation approaches. We found that few area-based approaches have been rigorously evaluated, and that it is often difficult to obtain requisite observational data to defin ....

Area Based Management , Closed Areas , Dynamic Ocean Management , High Seas Fisheries , Marine Protected Areas , Tuna Fisheries ,