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harknesslab.bsky.social
Harkness Laboratory of Fisheries Research
@harknesslab.bsky.social
160 followers 200 following 23 posts
Harkness Laboratory of Fisheries Research. An Ontario Ministry of Natural Resources field station on Lake Opeongo, Algonquin Park. Beginning in May 1936.
Posting: Mark Ridgway

Harkness.ca
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Reposted by Harkness Laboratory of Fisheries Research
animalecology.bsky.social
🌡️ Alternative behavioral responses can buffer animals from environmental stress, yet the trade-offs of habitat selection remain poorly understood. Using a bioenergetics framework, researchers show different energetic strategies for a cold-water fish

➡️ buff.ly/l1GIXBf
November 11, 2025 at 1:02 PM
Reposted by Harkness Laboratory of Fisheries Research
arcticsciencej.bsky.social
New in Arctic Science: Long-term vertebrate research and monitoring sites in Arctic Canada explores decades of wildlife studies across the North and the lasting legacy of these field stations.

Read more ▶️ buff.ly/hluh47u

#ArcticScience #WildlifeResearch #ArcticCanada
Small shorebird with brown and white feathers standing in shallow Arctic water surrounded by seaweed and ripples.
October 6, 2025 at 9:38 PM
Reposted by Harkness Laboratory of Fisheries Research
milnetechnologies.ca
Wishing you calm seas @alltooclearfilm.bsky.social! In partnership with @harknesslab.bsky.social and @lakeheaduniversity.bsky.social, we will be sinking an autonomous up-looking echosounder that will ping 24/7 to help understand the diel behaviour of fish and zoop at Sup Shoal. Be sure to tune in!
September 10, 2025 at 1:24 PM
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johnwares.bsky.social
Aren't they lovely? Congratulations to my great colleague Bud Freeman, this is the culmination of over a decade of work!

www.mapress.com/zt/article/v...
Two new species of Micropterus (Centrarchidae) endemic to Atlantic Slope river drainages in Georgia, South Carolina and North Carolina, U.S.A. | Zootaxa
www.mapress.com
August 19, 2025 at 1:16 PM
Reposted by Harkness Laboratory of Fisheries Research
ecoinvasions.bsky.social
1/ Who published the first freshwater food web? American ecologist Victor Shelford may have done so (see below) in his classic 1913 monograph "Animal communities in temperate America as illustrated in the Chicago region", a book that inspired Charles Elton (who cited it in Animal Ecology)...
August 15, 2025 at 2:38 AM
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bradhowell.bsky.social
Some great talks on fish metabolism, thermal tolerance, and bioenergetics by folks from @trentuniversity.bsky.social at this year’s #SEBconference in Antwerp, Belgium.

@sebiology.bsky.social
@erinmcstewart.bsky.social
@jaydebon.bsky.social
@chris-on-fish.bsky.social
July 10, 2025 at 11:18 AM
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eco-nana.bsky.social
Think La Niña years are “cool”? Not anymore. Even our coolest years today are hotter than the hottest El Niño years of the past. Climate change is flipping the script — fast. A huge thank you to @zacklabe.com for his amazing graphic!
La Niña Years—Our “Cool” Years—Are Now Warmer Than El Niño Years
Every year, Earth’s temperature changes a little. Sometimes it gets hotter, and sometimes cooler. Scientists track this closely to understand how our climate is changing. But it’s not just about clima...
eco-nana.com
July 9, 2025 at 3:46 PM
Reposted by Harkness Laboratory of Fisheries Research
conphysjournal.bsky.social
Home is where the heat is (for brook trout that is)

Intrigued? Then check out this latest #ConPhys in Action piece, explaining the importance of local conditions to 🐟 temperature tolerance, and therefore for #Conservation planning.

Comments on Stewart et al (links in 🧵⬇️ )
April 9, 2025 at 12:03 PM
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whatahoot.bsky.social
A terrific afternoon for fish biology here at #SEBconference ❤️🐟 Great talks by @leeuwisrobin.bsky.social, Moa Metz, and @erinmcstewart.bsky.social about different ways that fish respond to climate warming!
A scientist presents her take-away slide on a large dark stage. It reads: Take-away • Zebrafish can evolve improved growth at warmer temperatures • Thermal performance curves can undergo a left or right shift • Ectothermic vertebrates may adapt to global warming by enhancing performance • Role of selection in shaping thermal resilence A scientist presents her title slide on a large stage, it features a beautiful picture of a brook trout. A scientist presents the methods of her research on a large screen
July 8, 2025 at 3:49 PM
Reposted by Harkness Laboratory of Fisheries Research
canjzoology.bsky.social
Meta-analysis reveals that density-dependent growth, survival, and their trade-off vary systematically among habitats and taxa
buff.ly/DgfgJYQ
Line graph with error showing relationship between growth and survival across birds, fish, herptiles, invertebrates, and mammals.
May 6, 2025 at 1:55 PM
Reposted by Harkness Laboratory of Fisheries Research
iceoutbot.bsky.social
Current #IceOut conditions in #AlgonquinPark. Image courtesy of The Friends of Algonquin Park.
A webcam shot of Lake of Two Rivers in Algonquin Park.
April 26, 2025 at 12:00 PM
harknesslab.bsky.social
And often at high densities, so important food web participants
matthewlmiller.bsky.social Matthew L. Miller @matthewlmiller.bsky.social · Apr 25
Did you know there are around 78 sucker species, and all but 2 are found exclusively in North America?

They are not "trash fish" but rather vitally important to freshwater ecosystems. Many have fascinating life histories. And, for anglers, they're great fun to pursue.
Silver redhorse, caught in Minnesota. The redhorse species make spawning runs in large numbers in the Midwest, an often-overlooked natural phenomenon. Sonoran sucker, caught in Arizona. White sucker, a common species in the eastern and midwestern United States. I caught this one in Theodore Roosevelt National Park, North Dakota. Sacramento sucker, caught in California.
April 25, 2025 at 8:42 PM
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tjnear.bsky.social
Second paper this week from #NearLab!
chasedbrownstein.bsky.social Chase Brownstein @chasedbrownstein.bsky.social · Apr 25
1/10 🚨🚨 New paper with @tjnear.bsky.social! Here, we revise the systematics of sturgeons using a phylogenetic approach! We confirm an Early Cretaceous origin for the sturgeon total clade and resurrect several genera for living species!
April 25, 2025 at 6:08 PM
harknesslab.bsky.social
Elton's day.
@ecoinvasions.bsky.social thanks for the reminder

Interesting Harkness connection...

1/x
March 29, 2025 at 12:48 AM
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ecoinvasions.bsky.social
Born on March 29, 125 years ago:
One of the most influential ecologists of the 20th century and the father of animal ecology, who turned natural history into a science: Charles Sutherland Elton (1900-1991).
A birthday thread… 🧵[1/8]
March 28, 2025 at 7:44 PM
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benjaminhlina.bsky.social
Trophic Ecologists - new pkg alert - {trps} (pronounced ‘tropes’): Bayesian Trophic Position Models using 'Stan'. Estimates trophic position using equations from Post (2002), Vander Zanden & Vadeboncoeur (2002), & Heuvel et al. (2024).

benjaminhlina.github.io/trps/

#rstats #ecology #foodwebs
Bayesian Trophic Position Models using stan
Bayesian trophic position models using stan by leveraging brms for stable isotope data. Trophic position models are derived by using equations from Post (2002) <doi:10.1890/0012-9658(2002)083[0703:USI...
benjaminhlina.github.io
March 22, 2025 at 7:45 PM
Reposted by Harkness Laboratory of Fisheries Research
cdnsciencepub.com
How do habitat conditions, water flow, and #climatechange shape fish populations? A new CJFAS collection honours Dr. Boisclair’s research on these key topics ▶️ ow.ly/B4vl50UYTCf

📸 Eva Enders
Image of water stream with trees. Photo credit Photo credit: Eva Enders. CJFAS logo with text overlay: An understanding of the processes regulating fish production.
March 20, 2025 at 3:24 PM
harknesslab.bsky.social
3-2 in overtime
Amazing game on ice;
Perfect ... off ice
February 21, 2025 at 5:19 AM
harknesslab.bsky.social
Today at Harkness. Thanks Lucas....
Feb 14 2025 at Harkness Laboratory of Fisheries Research
February 14, 2025 at 4:04 PM
harknesslab.bsky.social
Thanks, Louise, for highlighting this. Agree.
Fieldwork brings authenticity - for the public, for ourselves, and for applications.
Undergrads & grads from our field station are always in demand.
chavarie.bsky.social Louise Chavarie @chavarie.bsky.social · Feb 7
If you did not read this paper, please do!!! Fieldwork needs to be recognized as a valuable and tangible aspects of science! Funding agency needs to start to value this more or....

Extinction of experience among ecologists sciencedirect.com/science/arti...
Extinction of experience among ecologists
Fieldwork-based research and education in ecology are under multiple threats and are progressively declining. We call for greater attention to this on…
sciencedirect.com
February 8, 2025 at 2:28 AM
Reposted by Harkness Laboratory of Fisheries Research
laurenstacho.bsky.social
Shout out to @ucsandiego.bsky.social and @scrippsocean.bsky.social for keeping this going right now! keelingcurve.ucsd.edu
The Keeling Curve
The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.
keelingcurve.ucsd.edu
February 5, 2025 at 3:55 PM
Reposted by Harkness Laboratory of Fisheries Research
fishconserve.bsky.social
🙁 Removal of more than 250 endangered southern steelhead trout took place last Thursday at Topanga Creek in a rescue operation led by the California Department of Fish and Wildlife.
Hundreds of endangered fish rescued from bodies of water damaged by L.A. fires
Hundreds of endangered fish were removed last week from bodies of water left damaged by the Palisades Fire. A removal of more than 250 endangered southern steelhead trout took place last Thursday a…
buff.ly
January 29, 2025 at 11:39 PM
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matthewlmiller.bsky.social
There are as many as 7 species of redeye bass swimming southeast US streams.

Redeye fly fishing is similar to small-stream trout: beautiful streams, surface action, small but striking fish.

I've caught 5 redeye bass species & hope to return for Warrior & Cahaba bass this year. #flyfishing
Bartram's bass, one of 7 redeye bass varieties, caught in South Carolina. Fishing for Tallapoosa bass in a typical redeye bass stream in Georgia. Fly fishing among the shoal lilies for Bartram's bass. Coosa bass, caught in a small stream in Alabama. Redeye bass are not large bass, but I love the places you find them and their explosive takes of surface poppers.
January 24, 2025 at 6:43 PM
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marc-alessi.bsky.social
Never forget that Exxon built their own climate model in the 1970s that correctly predicted climate change from the burning of fossil fuels
January 13, 2025 at 3:10 AM
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not-klaatu.bsky.social
The future is #catostomidae... firmly believe that if there's a sentinel species that can tell us about enironmental changes, this group of fishes is it. Widely distributed, rarely targeted by anglers (and therefore don't need to worry about fishing mortality), and, I mean, just look at that face
matthewlmiller.bsky.social Matthew L. Miller @matthewlmiller.bsky.social · Jan 10
There's a sucker (myth) born every minute. These are not trash fish.

Suckers are native fishes found across N. America. They are essential parts of the ecosystem. They're cool fishes to pursue.

Photo by Joel Sartore, of a largescale sucker I caught for him to photograph (and release).
Largescale sucker photograh by Joel Sartore/Photo Ark. I caught this sucker for Joel while he was visiting Boise to photograph some zoo animals. He had a free day and noted he wanted to photograph more native fishes. We went out to a local stream and I caught this native sucker. It was photographed in a tank and safely released.
January 10, 2025 at 11:33 PM