Alaska

Genetic diversity in Alaska’s red king crab may provide climate change resilience

Published

1 year ago

January 13, 2025

Genetic diversity in Alaska’s red king crab may provide climate change resilience

Red king crab on the deck of a research vessel. Credit: NOAA Fisheries / Erin Fedewa

New genetic research on the Alaska red king crab reveals previously undiscovered diversity among different regions, suggesting the species is more resilient to climate change and changing ocean conditions.

Maintaining genetic diversity within and among populations is vital to ensure species are resilient to challenging conditions. Without it, a single disease or set of conditions—such as a prolonged change in ocean acidification—could drive a species to extinction.

Fortunately, new research has revealed more genetic diversity across Alaska’s red king crab populations than originally documented. This suggests that the species will be more resilient in the face of changing conditions like ocean warming. However, any efforts to enhance red king crab populations need to be careful not to affect this genetic diversity.

King crab in Alaska

Historically, the red king crab fishery was Alaska’s top shellfish fishery. It’s embedded in the culture of Alaska’s working waterfronts and king crabs have been the centerpiece of holiday feasts around the world. However, the red king crab fishery collapsed in the 1980s. Since 1983, most populations have been depressed statewide and the Gulf of Alaska fishery remains closed.

Wes Larson is co-author of the research published in Evolutionary Applications and the genetics program manager at the NOAA Alaska Fisheries Science Center. He reflects, “When it comes to understanding crab biomass declines and how to recover populations, we need to better understand population structure and local adaptation. There are a lot of concerned and invested fishermen, processors, and community members getting more engaged in these issues and it’s propelling new and innovative research.”

To dig into this need, Larson and a team of collaborators embarked on a study to generate whole genome sequencing data on red king crab in different locations across Alaska. The benefit of whole genome sequencing over previous methods is that it’s akin to reading the full story of an organism’s makeup instead of just a chapter or two. This holistic approach offers more robust analysis in order to tease apart similarities and differences between locations.

New genetics research in Alaska

Traditionally, information about commercially important species comes from fisheries-dependent data (collected on commercial fishing vessels) or independent surveys (from scientific research vessels). From these, we gather data on abundance, size, sex, reproductive status, diet, etc.

Genetics tools help to fill in the information gaps from traditional surveys, and can be used to:

Define stock of origin
Assess local adaptation
Document genetic diversity and inbreeding

Whole genome sequencing builds on past methods by enhancing our ability to detect important differences between populations at finer scales.

Red king crab live in diverse environments—from coastal bays in the north, to open sea shelves in the Bering Sea. They also live in small bays and fjords fed by glacial melt in Southeast Alaska and the Gulf of Alaska. King crab in Alaska generally inhabit the following five regions:

Southeast Alaska
Gulf of Alaska
Aleutian Islands
Eastern Bering Sea
Norton Sound / Chukchi Sea.

Previous genetic studies have hypothesized that king crab from these regions are split into three genetic groups:

Southeast Alaska
Gulf of Alaska / East Bering Sea
Aleutian Islands / Norton Sound.

However, these studies used older genetic techniques, which may not provide the resolution necessary to accurately define genetic structure. The current study reinvestigated the genetic structure of the red king crab in all five regions using high-resolution data derived from whole genome sequencing.

Genetic diversity in Alaska red king crab may provide climate change resilience — Map of collection sites and years of collections colored by regions. Credit: NOAA Headquarters

The results of this study were revealing and informative. Scientists found substantial genetic structure within populations and genetic diversity between regions. In some cases, scientists observed this diversity between populations separated by only a few hundred kilometers.

“Crabs have pelagic larvae, so this is very surprising given the potential for ocean currents to distribute these larvae long distances,” said Larson. “However, these populations do not seem to be mixing and have become genetically isolated.”

Ultimately, the previous hypothesis of three genetic groupings was revised by this whole genome sequencing study. This updated method provided more clarity of fine-scale genetic differences than previous methods. The data indicate that there are six, possibly seven, genetically distinct populations:

Southeast Alaska
Gulf of Alaska
Aleutian Islands
Bristol Bay
Pribilof Islands
Norton Sound / Chukchi Sea

Data showed previously unrecognized differences between the Gulf of Alaska and East Bering Sea regions. And the East Bering Sea region is split into separate Bristol Bay and Pribilof Islands populations.

Researchers also found that the Aleutian Islands and Norton Sound/Chukchi Sea regions are unique. Data suggests that Norton Sound and Chukchi Sea may be distinct as well. However, further research is required to determine if this is the case.

Scientists attribute this genetic diversity to a combination of factors including populations deriving from different glacial refugia. These are areas that remained ice-free during the lce Age. And more recently, natural selection (genetic changes driven by adaptation) and genetic drift (genetic changes that are random) likely contributed to this diversity. The research documented evidence of local adaptation in most populations.

Fisheries management implications

The scientists’ approach to sequence the whole genome of red king crabs was a more detailed method using orders of magnitude more data than previous studies.

It also confirmed that fisheries are being managed effectively by region in Alaska. For example, crab stocks in the Gulf of Alaska, Aleutian Islands, Bristol Bay, and Pribilofs Islands regions are each managed separately. Prior to this new research, the Bristol Bay and Pribilof Islands were not found to be genetically distinct. This new understanding reinforces that we should continue to manage them separately.

Understanding population structure, and these newly discovered genetic signals of local adaptation, is also important for preventing overfishing on genetically unique populations. And it’s critical to provide information on how local adaptations influence responses to different climatic conditions.

We may find that some populations have the potential to fare better in future climate conditions that are likely as climate change progresses. Genetics can also reveal shifts in population distribution. Some shifts may already be underway in the Bering Sea as the North Pacific warms.

Finally, with the Gulf of Alaska population being depressed, scientists would expect a higher potential for inbreeding and lower genetic diversity. However, researchers found no evidence of reduced diversity, meaning genetic health did not suffer as the population declined. This foundation of genetic diversity means that genetic factors should not limit recovery.

This research also provides important data that can be used to inform broodstock selection for red king crab enhancement programs. Enhancement programs raise young crabs in hatcheries and release them into the wild to enhance the population.

Given the genetic diversity of red king crab across Alaska, it’s vital to prioritize local broodstock for enhancement before sourcing from elsewhere. This helps to keep genetic diversity intact and ensures that the genetic integrity of locally adapted populations is not jeopardized.

More information:
Carl A. St. John et al, Whole Genome Sequencing Reveals Substantial Genetic Structure and Evidence of Local Adaptation in Alaskan Red King Crab, Evolutionary Applications (2024). DOI: 10.1111/eva.70049

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Genetic diversity in Alaska’s red king crab may provide climate change resilience (2025, January 13)
retrieved 13 January 2025
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Alaska

Alaska House advances bill to boost free legal aid for vulnerable Alaskans

Published

12 hours ago

March 2, 2026

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Alaska House advances bill to boost free legal aid for vulnerable Alaskans

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Alaska

Marten visits are a glimpse into mystery

Published

24 hours ago

March 1, 2026

Press Room

Marten visits are a glimpse into mystery

A trapper fresh out of the Cosna River country in Interior Alaska said he can’t believe how many martens he had caught in a small area so far this winter.

Friends are talking about the house-cat size creatures visiting their wood piles and porches. Could this be a boom in the number of these handsome woodland creatures?

Since the late 1970s, the University of Alaska Fairbanks’ Geophysical Institute has provided this column free in cooperation with the UAF research community. Ned Rozell is a science writer for the Geophysical Institute. Portions of this story appeared in 2000.

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Alaska

Alaska Sports Scoreboard: Feb. 28, 2026

Published

1 day ago

March 1, 2026

Press Room

High school

Basketball

Girls

Monday

Kenai Central 63, Nikiski 33

Colony 68, Grace Christian 46

Tuesday

South 33, East 22

Service 62, Dimond 47

Redington 47, Houston 17

Wasilla 60, Mountain City Christian Academy 44

Kenai Central 54, Homer 27

Bartlett 53, Chugiak 29

Mt. Edgecumbe 59, Sitka 50

Wednesday

Shishmaref 82, Aniguiin 34

Shaktoolik 73, Anthony Andrews 25

Savoonga 61, White Mountain 56

Glennallen 68, Nenana 26

Seward 72, Houston 8

Service 65, South 26

Brevig Mission 65, Koyuk Malimiut 47

Chief Ivan Blunka 67, Manokotak 30

Thursday

White Mountain 76, Anthony Andrews 50

Hoonah 44, Skagway 21

Koyuk Malimiut 53, Aniguiin 51

Nunamiut 74, Kali 17

Glennallen 25, Delta 20

Birchwood Christian 42, Nanwalek 24

Ninilchik 33, Lumen Christi 30

Dimond 59, Chugiak 54

Shaktoolik 57, Savoonga 24

Colony 43, Mountain City Christian 41

Alak 67, Meade River 66

Lathrop 42, West Valley 34

Seward 78, Nikiski 32

Grace Christian 56, Soldotna 41

Kenai Central 56, Houston 10

Wasilla 72, Palmer 27

Bristol Bay 55, Chief Ivan Blunka 30

Nome-Beltz 33, Bethel 24

Scammon Bay 46, Ignatius Beans 28

Aniak 83, Akiachak 45

Shishmaref 53, Brevig Mission 51

Metlakatla 64, Haines 21

Friday

Chief Ivan Blunka 68, Togiak 38

Meade River 80, Nuiqsut Trapper 34

Nunamiut 68, Alak 50

Cook Inlet Academy 33, Birchwood Christian 32

Meade River 71, Kali 46

Kalskag 62, Akiachak 47

Hoonah 39, Kake 37

Soldotna 36, Palmer 23

Delta 54, Valdez 45

Unalakleet 61, Chevak 45

Minto 46, Hutchison 26

West 71, Bartlett 65

Seward 63, Homer 19

North Pole 61, West Valley 25

Newhalen 78, Chief Ivan Blunka 40

Birchwood Christian 43, Nanwalek 28

Bethel 42, Nome-Beltz 35

Aniak 65, Tuluksak 50

Scammon Bay 49, St. Mary’s 38

Monroe Catholic 84, Galena 42

Ketchikan 57, Redington 24

Meade River 69, Alak 62

Fort Yukon 60, Jimmy Huntington 19

Grace Christian 50, Kenai Central 45

Shaktoolik 44, Shishmaref 34

Wrangell 44, Petersburg 31

Saturday

Unalakleet 41, Chevak 37

Meade River 54, Nunamiut 51

Monroe Catholic 68, Galena 32

Newhalen 32, Bristol Bay 26

Cook Inlet Academy 65, Birchwood Christian 32

Soldotna 55, Palmer 42

Nunamiut 48, Meade River 46

Boys

Sunday

SISD 51, Yakutat 18

Monday

Eagle River 54, Birchwood Christian 52

Colony 69, Grace Christian 64

Kenai Central 68, Nikiski 30

Tuesday

Susitna Valley 48, Lumen Christi 46

Dimond 54, Service 47

South 50, East 46

Houston 53, Redington 40

Wasilla 63, Mountain City Christian Academy 50

Kenai Central 74, Homer 47

Chugiak 66, Bartlett 45

Wednesday

SISD 59, Yakutat 17

Shishmaref 85, Savoonga 45

Hydaburg 58, Hoonah 51

Shaktoolik 103, Martin L Olson 49

Skagway 68, Gustavus 24

Davis-Romoth 108, Kobuk 31

Klawock 68, SISD 27

Glennallen 61, Nenana 57

Gambell 46, James C Isabell 31

South 63, Service 60

Seward 81, Houston 73

Bristol Bay 80, Chief Ivan Blunka 61

Mt. Edgecumbe 68, Sitka 59

Scammon Bay 79, Ignatius Beans 34

Brevig Mission 73, Aniguiin 67

Thursday

Savoonga 69, James C Isabell 61

Hoonah 64, Yakutat 45

Alak 88, Meade River 38

Shaktoolik 110, Brevig Mission 30

Chief Ivan Blunka 62, Tanalian 39

Nunamiut 66, Kali 48

Davis-Romoth 91, Buckland 45

Ninilchik 83, Lumen Christi 38

Monroe Catholic 43, North Pole 42

King Cove 57, Bristol Bay 41

Metlakatla 52, Haines 46

Nome-Beltz 62, Bethel 45

Skagway 79, Angoon 30

Birchwood Christian 69, Nanwalek 63

Dimond 60, Chugiak 57

Colony 75, Mountain City Christian Academy 49

Wasilla 66, Palmer 40

Klawock 63, Hydaburg 49

Shishmaref 58, Gambell 47

Grace Christian 63, Soldotna 52

Seward 66, Nikiski 51

Kenai Central 61, Houston 48

Nuiqsut Trapper 64, Alak 51

West Valley 51, Lathrop 44

Akiachak 83, Akiak 64

Scammon Bay 62, Marshall 54

Friday

Hoonah 71, SISD 38

Hydaburg 61, Kake 50

Chief Ivan Blunka 73, Bristol Bay 68

Kali 63, Meade River 45

Nunamiut 80, Nuiqsut Trapper 62

Service 58, East 50

Angoon 61, Hoonah 56

Cook Inlet Academy 73, Birchwood Christian 34

King Cove 75, Newhalen 39

Petersburg 53, Wrangell 20

Skagway 46, Klawock 43

Metlakatla 50, Haines 42

Nome-Beltz 71, Bethel 43

Juneau-Douglas 67, Tri-Valley 45

Wasilla 73, Chugiak 43

West 83, Bartlett 36

Colony 73, Kodiak 32

Delta 62, Valdez 54

West Valley 72, North Pole 46

Palmer 57, Soldotna 47

Nenana 55, Cordova 53

Chief Ivan Blunka 63, Manokotak 48

Scammon Bay 67, St. Mary’s 54

Unalakleet 87, Chevak 64

Shaktoolik 73, Shishmaref 54

Saturday

Unalakleet 95, Chevak 44

Cook Inlet Academy 95, Birchwood Christian 50

South 73, Eagle River 35

Palmer 45, Soldotna 40

• • •

College

Hockey

Friday

UAF 2, UAA 0

Saturday

UAA vs. UAF (Late)

• • •

Women’s basketball

Thursday

UAA 79, Western Oregon 58

Saint Martin’s 99, UAF 59

Saturday

Western Oregon 73, UAF 58

UAA vs. Saint Martin’s (Late)

• • •

Men’s basketball

Thursday

Saint Martin’s 77, UAF 65

UAA 80, Western Oregon 59

Saturday

UAF 82, Western Oregon 74

UAA vs. Saint Martin’s (Late)

• • •

NAHL

Friday

Anchorage Wolverines 5, Chippewa Steel 4

Saturday

Anchorage Wolverines vs. Chippewa Steel (Late)

• • •

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