Washington, District of Columbia 2021-10-28 14:53:53 –
October 28, 2021
A new study of the Dungeness crab fishery across the west coast of the United States and Canada on the Pacific Northwest predicts how this crustacean will be transported under climate change.
The results show that by the end of this century, hypoxic water poses the greatest threat. And while these crabs begin as small, free-floating larvae, the most vulnerable to the hypoxic coastal waters of summer are adults with sharp claws.
Open access study Researchers at the University of Washington, the University of Connecticut, and the US National Oceanic and Atmospheric Administration will publish in the December issue of AGU Advances, the journal of the American Geophysical Union.
“By including all life stages, we were able to identify important life stages and recommend them to administrators,” the co-authors said. Samantha Shedrecki I started my research at the University of Connecticut while at UW. “If you look at it seasonally rather than annually, you’ll get a variety of and more serious vulnerabilities estimates.”
Dungeness crab is the largest single-species fishery in the northwestern United States. The Dungeness Crab Festival in Washington was held in October near the Dungeness Crab Cove and is named after the Dungeness Crab. Crustaceans are popular for holiday and traditional meals in the Pacific Northwest. The study was designed in consultation with the Indianation tribes of Ho, Maca, Quileute, and Kino, members who harvest, survey, and eat Dungeness crabs on the Olympic Peninsula in Washington.
Researchers used a detailed computer model of marine conditions to simulate the changing properties of the water in which crabs live. The model uses a scenario of high carbon emissions up to 2100, how heat trap gas in the atmosphere warms the ocean, carbon dioxide transferred from the air makes surface water more acidic, and warmer water Find out if it retains less dissolved oxygen. ..
Previous research Dungeness crabs have been shown to be vulnerable to climate change. Although these studies focused on changes in ocean pH, the new paper includes multiple marine properties and uses more detailed models of space and time.
Both time and place are important. Crabs mate in spring and females lay eggs in late autumn. Eggs begin to hatch in January and release larvae. The larvae float in the offshore currents, growing five times, shedding and regrowth. In the summer, fully developed larvae approach the shore and molt and become larval crabs that run around the ocean floor.
The authors used a marine model to study the effects of climate stressors at various times throughout the life stages of the Dungeness crab (eggs to larvae, larvae, and adults).
“We have found that population-level vulnerabilities increase for all three stressors. The most serious are hypoxic levels,” said the lead author. Hallever burger, PhD student at the University of Connecticut. “Hypoxic events occur during the spring and summer coastal upwelling and affect adults, but ocean acidification will appear more year-round in the future, affecting all life stages, but less seriously. Not. “
Laboratory studies of Dungeness crab combined with model results suggest that the most serious effect is a decrease in dissolved oxygen along the coastal seafloor in summer, which is harmful to adults. This is unlike other species, such as shellfish, which are considered to be the most vulnerable during larval life.
Like other animals, crabs breathe oxygen. Warm water retains less gas, so even if marine organisms can handle higher temperatures and acids, lower oxygen may reduce their chances of survival.
“The value of this reduced model is that it helps tribal and state institutions focus their efforts on both space and time,” the co-authors said. Jan Newton, UW Applied Physics Laboratory Oceanographer, Washington Ocean Acidification Center.. “This information is very relevant to the resource manager.”
Researchers say these results may be incorporated into decision-making in response to changing marine conditions.
“For example, we could monitor a summer hypoxic event and pull the crab trap early,” Berger said. “This helps reduce the number of crabs that die in traps.”
Further studies on Dungeness crab should include more laboratory studies on how the species responds to multiple stressors. More generally, according to the authors, this study shows how marine species with complex life stages respond to climate change.
Other co-authors Darren Pilcher When Emily Norton A co-operative research institute for climate, marine, and ecosystem research based at the University of Washington. Simone Allin When Isaac Kaplan At the US National Oceanic and Atmospheric Administration; Catherine Matassa At the University of Connecticut.
This study was funded by NOAA and was part of a regional vulnerability assessment of the Olympic coast to ocean acidification.
NOAA Grant: NA17OAR0170166
Part of this text Press release According to the University of Connecticut.
tag: Applied Physics Laboratory •• Climate change •• Environmental University •• Climate Cooperative Research Institute •• Jan Newton •• Ocean and ecosystem research •• Oceanography •• Samantha Shedrecki
How Dungeness crabs’ complex lifecycle will be affected by climate change Source link How Dungeness crabs’ complex lifecycle will be affected by climate change