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43 posts in Research

Places that beluga whales like in the Arctic are not closely linked to ice conditions

A new study uses two decades of tagging data on beluga whales to identify habitats that they prefer. In the eastern Chukchi and eastern Beaufort Seas, belugas preferred places with particular depth features, like canyons and continental slopes, instead of preferring places based on sea ice characteristics. Thus while reduced sea ice in this region may indirectly affect belugas through ecosystem changes, they did not rely on sea ice features to find places with good food availability. 

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How much more are people willing to pay for seafood labeled as sustainable?

Seafood consumers are increasingly interested in buying seafood that has a sustainable ecolabel certification by companies such as the Marine Stewardship Council. A new study identifies a key reason why it is so difficult for retailers to get a price premium for ecolabeled seafood: people differ widely in their willingness to pay more for ecolabels. In particular, those who might be happy to pay a lot more for sustainably labeled seafood, may not be willing to pay a lot for seafood relative to other protein such as chicken, pork, or beef. 

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New method teases out important salmon adaptations hidden in duplicated DNA

Salmon have complicated DNA that, at some point in the past, was completely duplicated. These duplicated genomes are hard to sequence because every gene has multiple copies, and in the past, duplicated genes were filtered out before studies were conducted on how salmon adapted to different environments. But new work on humans, yeast and rats shows that duplicated genes are often responsible for important adaptations. 

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New miniaturized acoustic fish tag is small enough to be injected by a syringe

Smaller tags are needed to eliminate tagging effects in fish survival studies. Now a new miniaturized acoustic tag is small enough to be injected by syringe. The injectable transmitter, engineered by Pacific Northwest National Laboratory, is just 15 mm in length, 3.35 mm in diameter, and weighs 0.216 g. The research team tested the new tag over a 500-km reach in the Columbia/Snake River using young Chinook salmon. 

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Genetic technique discovers three hidden species where one was assumed

Redfish (North Atlantic fish in the genus Sebastes) are highly diverse and notoriously hard to identify. Now, new research shows that the problem is even worse than was thought. The new genetic analysis of microsatellites in rose fish (Sebastes norvegicus) showed that what is currently thought to be a single species, is actually three separate species. One of the new species, the giant version, is larger and has some biological features that can be used to distinguish it; but the other two new species are currently impossible to distinguish by external appearance. 

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Old growth fishes become scarce under fishing

New research shows that the oldest fish can decline dramatically in fished populations, even when fisheries are sustainable. Old fish declined in 97% of populations when compared to an unfished state, and in about a third of populations, old fish declined by more than 90%. These changes reduce the diversity of fished populations, which can lead to lower stability. Reducing the impact of fishing on old fish would require marine reserves, rotational harvesting, or slot limits that prohibit fishing on all but a narrow range of fish ages. 

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Infectious diseases decline with urbanization and wealth, but not biodiversity

Infectious diseases reduce human health both through death and disability, with the total disease burden being lower in wealthy and more urban countries, but higher in countries with more biodiversity. Contrary to expectations, increases in biodiversity over time did not result in better human health, and in fact higher disease burdens resulted when forest cover increased over time. Thus the key reason why infectious disease burdens have declined in recent decades is a shift towards urbanization and greater wealth, immediately suggesting levers for improving global human health. 

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Fishing portfolios and shifts buffer Alaskan communities from abrupt change

New research on Alaskan fishing communities shows the crucial importance of fishing portfolios and turnover. In 1989, when there were both major ocean and market regime shifts, most communities lost fishing revenue. But those with the greatest diversity of fished species, and those that were most able to switch from one group of species to another, had little lost revenue, or even experienced increased revenue. 

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When do multiple factors act together to endanger animal populations?

Animal populations are endangered when they face multiple human-caused pressures at the same time, especially if those pressures interact to worsen depletion. A new study shows that whether pressures interact to worsen overall pressure, or interact to reduce overall pressure, depends on how animal populations behave at low versus high densities. If the number of offspring that survive for each adult drops off slowly as populations increase, this can unexpectedly lead to trouble, since it is more likely that individual pressures will interact to make things worse. 

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SAFS professors Parrish and Roberts highlighted for their open science work

To celebrate International Open Access Week, the University of Washington Libraries posted profiles and interviews with two SAFS faculty, Julia Parrish and Steven Roberts, about how they conduct their research openly. The interview with Julia Parrish focuses on her citizen science work, which involves trained members of the public identifying and pinpointing the locations of more than 10,000 dead birds on the Pacific coast each year, and making the data available openly as well as in scientific publications. 

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