A Bering Sea marine heatwave triggers unprecedented crab hybridization, challenging fisheries management
- 1Alaska Fisheries Science Center Shellfish Assessment Program, National Marine Fisheries Service, Kodiak, AK 99615
Abstract
Marine heatwaves are increasingly recognized for their capacity to generate ecological surprises, yet the pathways that propagate these unexpected responses are often poorly understood. Here, we document an unanticipated ecological response 7 y after a Bering Sea marine heatwave, in which formerly rare snow crab (Chionoecetes opilio) × Tanner crab (C. bairdi) hybrid abundance increased 13.4-fold, and the proportion of commercial-sized hybrid males increased 13.1-fold, relative to historical averages. Using causal modeling, we show that the hybrid crab surge was mediated by a heatwave-induced collapse of snow crab rather than direct thermal effects on hybrid survival or increased spatial overlap between mature snow and Tanner crab. Our results reveal an indirect cascading pathway through which an extreme climate event triggered unexpected ecological consequences and unforeseen challenges for fisheries management in the Bering Sea. The dramatic increase in abundance of harvestable hybrid crab, coupled with their exclusion from existing management frameworks, highlights the vulnerability of inflexible management systems to unanticipated ecosystem responses.
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BibTeX
@article{fedewa2026bering,
title = {{A Bering Sea marine heatwave triggers unprecedented crab hybridization, challenging fisheries management}},
author = {Erin J. Fedewa and Emily R. Ryznar and Connor P. Cleary and Jennifer L. Gardner and Shannon M. Hennessey and W. Christopher Long and Jon I. Richar and Leah S. Zacher and Michael A. Litzow},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
year = {2026},
month = oct,
doi = {10.1073/pnas.2625670123},
url = {https://doi.org/10.1073/pnas.2625670123},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - A Bering Sea marine heatwave triggers unprecedented crab hybridization, challenging fisheries management
AU - Erin J. Fedewa
AU - Emily R. Ryznar
AU - Connor P. Cleary
AU - Jennifer L. Gardner
AU - Shannon M. Hennessey
AU - W. Christopher Long
AU - Jon I. Richar
AU - Leah S. Zacher
AU - Michael A. Litzow
PY - 2026
DA - 2026/10/19
JO - Proceedings of the National Academy of Sciences of the United States of America
DO - 10.1073/pnas.2625670123
UR - https://doi.org/10.1073/pnas.2625670123
AB - Marine heatwaves are increasingly recognized for their capacity to generate ecological surprises, yet the pathways that propagate these unexpected responses are often poorly understood. Here, we document an unanticipated ecological response 7 y after a Bering Sea marine heatwave, in which formerly rare snow crab (Chionoecetes opilio) × Tanner crab (C. bairdi) hybrid abundance increased 13.4-fold, and the proportion of commercial-sized hybrid males increased 13.1-fold, relative to historical averages. Using causal modeling, we show that the hybrid crab surge was mediated by a heatwave-induced collapse of snow crab rather than direct thermal effects on hybrid survival or increased spatial overlap between mature snow and Tanner crab. Our results reveal an indirect cascading pathway through which an extreme climate event triggered unexpected ecological consequences and unforeseen challenges for fisheries management in the Bering Sea. The dramatic increase in abundance of harvestable hybrid crab, coupled with their exclusion from existing management frameworks, highlights the vulnerability of inflexible management systems to unanticipated ecosystem responses.
SN - 0027-8424
SN - 1091-6490
ER -