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Evan

@evanwahm.bsky.social
846 followers 1.2K following 116 posts

Aspiring Freshwater Ecologist | he/him/his Pursuing a M.S. in Biology. Studying crayfish.

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Reposted by Evan
Yorkshire Crayfish Forum @yorkshirecrayfish.bsky.social · 13/10/2026
Did you know? White-clawed crayfish are a Keystone Species and Ecosystems Engineers. This is because they play an important part in the food web whilst also shaping their underwater environment to the benefit of many other native species. So, they're kind if a big deal! 😎 📸Lucy Atkinson
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Disappointed_I_Am @disappointed-i-am.bsky.social · 02/10/2026
The upland burrowing crayfish is one of the nine native species of crayfish here in Maryland. They are also the most colorful, ranging from blue to orange. #painting #acrylic #crayfish #art
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The Ricciardians @ricciardilab.bsky.social · 08/10/2026
wsbt.com/news/local/m...
wsbt.com
Michigan DNR issues warning about invasive red swamp crawfish
The Michigan Department of Natural Resources warning of an invasive species of crayfish in Cass County..Found in a pond in outside of Niles.Two carcasses of red
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BehavEcolPapers @behavecolpapers.bsky.social · 11/10/2026
Unexpected male choosiness: Female aggressiveness as a criterion for mate choice preference in the red swamp crayfish BehProc
dlvr.it
Unexpected male choosiness: Female aggressiveness as a criterion for mate choice preference in the red swamp crayfish
Publication date: Available online 9 October 2026 Source: Behavioural Processes Author(s): Qing Yang, Gui-Hong Ran, Wu-Xin Li, Yue-Hui Xie, Shi-Jian Fu, Ling-Qing Zeng
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Nature's SAFE @natures-safe.bsky.social · 28/09/2026
We are now part of a £1.5 million Species Recovery Programme funded by Natural England to support the recovery of the Endangered white-clawed crayfish. Our project will be part of a multi-pronged programme of scientific research into crayfish genetics, plague-resistance, pathogens and biobanking.
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Chris Mah @echinoblog.bsky.social · 28/09/2026
Big Crayfish! phys.org/news/2026-09...
phys.org
Biologists battle over North America's largest crayfish
When Caitlin Bloomer wrestled the massive Crawzilla crawdad—yes, that's its actual common name—out of the muck during a biological survey in Kentucky, she was convinced it was the largest crayfish eve...
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Reposted by Evan
Illinois-Indiana Sea Grant @ilinseagrant.bsky.social · 05/08/2026
Crayfish burrows are not just homes for crayfish. 🦞 Vulnerable species like the Hine’s emerald dragonfly and the crawfish frog depend on them for shelter, water, and survival. Protecting crayfish means protecting an entire ecosystem beneath our feet. #CrayWeek #Crayfish #HinesEmerald
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Evan @evanwahm.bsky.social · 09/08/2026
This is the spiny-cheek crayfish (Faxonius limosus), another invasive crayfish
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Evan @evanwahm.bsky.social · 15/07/2026
Bogna Griffin in Ireland uses her dog, Doby the conservation dog, to detect crayfish plague in Ireland!
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Dr Crayfish @drecrevisse.bsky.social · 29/06/2026
We also found (& expanded the range of) Canada's rarest crayfish: The Painted-hand Mudbug (L. polychromatus).
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Zen Faulkes @doctorzen.net · 10/06/2026
Marbled #crayfish showed up in Nova Scotia 🇨🇦 in 2023 - second population in North America - and only in the last couple of months has this been shared in the scientific literature. The problem of delay between detection and reporting worries me. doi.org/10.3391/bir....
doi.org
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Frank Burdon @fburdon.bsky.social · 10/06/2026
Read more about this research here:
link.springer.com
Invasive catfish linked to the decline of freshwater crayfish in two Aotearoa New Zealand lakes - Biological Invasions
The introduction of invasive species can have profound impacts on ecosystems, especially where endemic species have evolved in isolation. However, determining the influence of invasive species on nati...
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Reposted by Evan
Miguel Clavero @chikichanka.bsky.social · 07/05/2026
We found a sea lamprey, Petromyzon marinus, almost a meter in length, in the Guadalquivir River (S Spain), where the species was deemed extinct The stretch may offer conditions for reproduction (extensive sand beds, permanent waters), but nothing is known about it. @ebdonana.bsky.social (1/5)
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Evan @evanwahm.bsky.social · 27/04/2026
Awesome, thank you!!
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Evan @evanwahm.bsky.social · 27/04/2026
What’s the process like?
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Evan @evanwahm.bsky.social · 10/04/2026
Fantastic work!!
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Reposted by Evan
Dr Crayfish @drecrevisse.bsky.social · 08/04/2026
Excited to announce that the electronic version of our Field Guide to Crayfish in Canada is now available for free download on the ISAP site: www.invadingspecies.com/downloads/in...
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Evan @evanwahm.bsky.social · 06/04/2026
SE Georgia
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Evan @evanwahm.bsky.social · 04/04/2026
TaxonWorks is a pretty complicated platform, but has some great tools once you get the hang of it.
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Dr Crayfish @drecrevisse.bsky.social · 18/03/2026
Excited to announce the imminent publication of the new Crayfishes Guide for Canada !
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Brooke Grubb @bagrubb.bsky.social · 13/03/2026
The second paper of the year and an important piece of the puzzle for the conservation of the Hardin crayfish and its federal review process. While we come away with more questions than answers for this paper, we continue to move conservation efforts forward. doi.org/10.1007/s105...
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The Ricciardians @ricciardilab.bsky.social · 27/01/2026
Interested in the marbled crayfish (Procambarus virginalis) and its invasion potential? Have a look at our recently published biological synopsis, led by @vanmierlo.bsky.social Link: waves-vagues.dfo-mpo.gc.ca/library-bibl... #marmorkrebs #bioinvasions
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Evan @evanwahm.bsky.social · 27/01/2026
The Brushnose Crayfish (Procambarus pubescens), named after the prominent setae (hairlike structures) on its rostrum. #crayfish #invertebrate 🌍🧪
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Evan @evanwahm.bsky.social · 27/01/2026
Of course, happy to help! :)
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Evan @evanwahm.bsky.social · 27/01/2026
Female! The structure I circled is the annulus ventralis, which is the female reproductive structure.
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Reposted by Evan
Dietmar Straile @dietmarstraile.bsky.social · 17/01/2026
quagga mussels on the move (July 2023) #InvasiveSpecies #LakeConstance
image of quagga mussels attached to a crayfish, which stands on an aggregation of quagga mussels
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International Association of Astacology @crayfishiaa.bsky.social · 06/01/2026
The next crayfish world congress will be in New Orleans LA: www.iaa25.com
iaa25.com
Home | IAA25
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Dr Crayfish @drecrevisse.bsky.social · 10/01/2026
New Issues of Freshwater Crayfish is out. Has an article by yours truly and B. Schryer on the invasive WRCrays.
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Dr Crayfish @drecrevisse.bsky.social · 06/01/2026
Get excited! NEXT IAA is in New Orleans and registration is open www.iaa25.com
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The Ricciardians @ricciardilab.bsky.social · 18/12/2025
We have published a biological synopsis of the marbled crayfish, Procambarus virginalis #marmorkrebs #bioinvasions Link: waves-vagues.dfo-mpo.gc.ca/library-bibl...
A marbled crayfish in a lab aquarium. Photo: Ricciardi Lab, McGill University.
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crayfishresearchc.bsky.social @crayfishresearchc.bsky.social · 04/12/2025
After 4+ years of work, our article on Austropotamobius is out! We traced their 30-million-year journey across Europe, discovered hidden lineages, and finally solved some long-standing evolutionary puzzles. The key highlight? A. bihariensis from the Apuseni Mts: a small crayfish with a big story.
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Anthony Ricciardi @ecoinvasions.bsky.social · 16/11/2025
The Taxonomic Distinctiveness Hypothesis (Ricciardi & Atkinson 2004) predicts that invaders with no relatives in an area will have the largest ecological impacts. We found evidence of this for various aquatic systems. It is also supported by terrestrial studies. Eco-evolutionary context matters!
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Evan @evanwahm.bsky.social · 15/10/2025
Uhler's Giant Water Bug (Lethocerus uhleri) #wildlife #wildlifephotography #nature #Invert 🌍🧪
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Evan @evanwahm.bsky.social · 12/10/2025
Laughing Gull (Leucophaeus atricilla) #birds #birding #birdphotography #wildlife #wildlifephotography #nature 🪶🌍🧪
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Evan @evanwahm.bsky.social · 02/10/2025
Gulf Fritillary (Dione vanillae) #wildlife #wildlifephotography #nature #Invert #butterfly 🌍🧪
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Evan @evanwahm.bsky.social · 24/08/2025
Eastern Lubber Grasshopper (Romalea microptera) #wildlife #wildlifephotography #nature #Invert 🌍🧪
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Evan @evanwahm.bsky.social · 23/08/2025
Purple Gallinule (Porphyrio martinica) at the Savannah National Wildlife Refuge #birds #birding #birdphotography #wildlife #wildlifephotography #nature 🪶🌍🧪
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Evan @evanwahm.bsky.social · 21/08/2025
Common Gallinule (Gallinula galeata) at the Savannah National Wildlife Refuge #birds #birding #birdphotography #wildlife #wildlifephotography #nature 🪶🌍🧪
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Evan @evanwahm.bsky.social · 20/08/2025
Anhinga (Anhinga anhinga) at the Savannah National Wildlife Refuge #birds #birding #birdphotography #wildlife #wildlifephotography #nature 🪶🌍🧪
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Evan @evanwahm.bsky.social · 19/08/2025
Florida Softshell Turtle (Apalone ferox) at the Savannah National Wildlife Refuge #wildlife #wildlifephotography #nature #turtle 🐢🌍🧪
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Richard K Broughton @richardkbroughton.bsky.social · 16/08/2025
At #EOU2025 @eounion.bsky.social conference next week, we'll show new evidence implicating forestry in declines of British Marsh Tits during the era of woodland conversion in 1950/60s-1980s. This was period of steepest decline in Marsh Tits. Why? What was going on back then? #ornithology 1/5
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Evan @evanwahm.bsky.social · 17/08/2025
Mischievous Bird Grasshopper (Schistocerca damnifica) #wildlife #wildlifephotography #nature #Invert 🌍🧪
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Kevin Wertman @kevin.wertman.org · 15/08/2025
Good morning everyone! Here's a happy little butterfly #scape for #FlowersOnFriday 🦋🌞 Hope you have a great weekend ahead 😎 #eastcoastkin #photography #butterflies #bloomscrolling
A single orange Queen butterfly sits dead center of the photo, sitting on a single outstretched flower at an angle from another series of stems that run mostly the opposite way diagonally.   Background is blurry greens, yellows, and whites with a hint of a white fence.  Photo is very grainy.
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Jerry Cannon's Wild Life @jerrycannon27.bsky.social · 14/08/2025
A reddish Egret catches a Needlefish at Honeymoon Island #birds #Egrets #Wildlife #Nature
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Stephanie Graham @logicaphotography.bsky.social · 09/08/2025
Trying to capture the beautiful light on the canal tonight
Light reflected in the canal and some side lit trees
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Evan @evanwahm.bsky.social · 08/08/2025
Astacopsis gouldi
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Evan @evanwahm.bsky.social · 01/08/2025
An astacology (crayfish) episode is needed!! @drecrevisse.bsky.social @ericrlarson.bsky.social @ecoinvasions.bsky.social, Dr. Brian Roth (Michigan State University), Dr. Checo Colón Gaud (Georgia Southern University) and Chris Lukhaup would be great picks!
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Victoria Van Mierlo @vanmierlo.bsky.social · 29/07/2025
Blessed to find this beautiful electric blue Faxonius virilis while sampling the St. Lawrence for my doctoral work! This is a fairly rare phenotype for this native North American species!
Blue female Faxonius virilis from the St. Lawrence river.
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The Ricciardians @ricciardilab.bsky.social · 09/07/2025
1/ A 🧵 on some recent research by our lab on invasive crayfish: Sheppard et al (2024) found that projected climate warming in the Great Lakes will reduce the maximum feeding rate & increase the frequency & duration of gravid states of marbled crayfish. Read: redpath-staff.mcgill.ca/ricciardi/Sh...
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Ken Marsh @alaskaken.bsky.social · 16/07/2025
ON A SUNNY NOTE … a yellow warbler seems a tangy lemon drop in an Interior Alaska willow. #birds #nature #warbler
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