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Jon Sweetman

@jonsweetman.bsky.social
549 followers 324 following 35 posts

Assistant Research Professor in Aquatic Science 🇨🇦 at Pennsylvania State University. Freshwater Ecology, contaminants, paleolimnology, aquatic invertebrates

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Jon Sweetman @jonsweetman.bsky.social · 27/03/2026
Out sampling ponds this morning with my aquatic invertebrate class. Lots of Chaoborus (phantom midges).
A vial containing Chaoborus larvae
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Jon Sweetman @jonsweetman.bsky.social · 20/02/2026
#Macroinvertebrate for this week: Chimarra (Trichoptera: Philopotamidae) a net-spinning caddisfly collected from Centre County, PA. T-shaped labrum; assymetrical notch on frontoclypeus and long slender process on coxa of foreleg.. #caddisflies
Chimarra (Trichoptera: Philopotamidae). Head capsule with asymmetrical notch on frontoclyetus; membranous T-shaped labrumChimarra (Trichoptera:Philopotomidae). Foreleg showing subapical process on coxaChimerra (Trichoptera: Philopotamidae)
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Jon Sweetman @jonsweetman.bsky.social · 12/02/2026
Below are images of Ephemera (Ephemeroptera:Ephemeridae), who often contruct U-shaped burrows in depositional substrates. Note the forked frontal process.. #Ephemeroptera 2/6
Burrowing mayfly of Ephemeroptera:Ephemeridae: Ephemera spp. Dorsal view of head.  Note the forked frontal processBurrowing mayfly of Ephemeroptera:Ephemeridae: Ephemera spp. Lateral view of head with upturned tusksBurrowing mayfly of Ephemeroptera:Ephemeridae: Ephemera spp. Fluffy abdominal gills on dorsal area of abdomen
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Donna Giberson (Elbows UP!) 🇨🇦🇺🇦 @donnag.bsky.social · 11/02/2026
see also: diptera.de/CNC_Diptera/
diptera.de
Termination Diptera unit CNC Ottawa
Help the Diptera unit at CNC!!!
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Jon Sweetman @jonsweetman.bsky.social · 16/01/2026
New semester, first lab of my aquatic invertebrate class. Had students looking through some old samples today with Mason Ward’s help @masonsward.bsky.social. Had a beautiful Philopotamidae specimen: Chimarra spp. in a sample from half Moon Creek, PA #macroinvertebrates #Trichoptera
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Christine M. Cornish, PhD @cmcornish.bsky.social · 22/12/2025
Happy Yule to me and co-authors Marinus Otte and @jonsweetman.bsky.social!! Final PhD chapter out in @restorationecology.bsky.social Read about microbial communities in restored and natural wetlands in ND this holiday season 😊 doi.org/10.1111/rec....
doi.org
Sediment microbial communities in long‐term wetland restorations within the Prairie Pothole Region of the United States
Hydrologic wetland restoration in the Prairie Pothole Region is a common management practice to facilitate habitat and ecosystem recovery after degradation or drainage. Little is known about the reco...
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Jill Hamilton @jillahamilton.bsky.social · 12/12/2025
I just got off an extremely depressing call with my amazing Canadian collaborators at Natural Resources Canada who are facing cuts, retirement buy-outs, and layoffs for biologists across the board. This just seems a slap in the face to scientists in Canada.
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freshwater fELA 🇨🇦 @not-klaatu.bsky.social · 05/12/2025
This seems like kind of a big deal given the tumultuous history involved... www.cbc.ca/news/health/...
cbc.ca
Journal retracts influential glyphosate safety study from 2000 | CBC News
An influential research article that claimed a popular weed-killer was safe has been retracted 25 years after it was published, prompting environmental groups in Canada to ask the federal government t...
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Jon Sweetman @jonsweetman.bsky.social · 10/06/2025
Severe thunderstorm and tornado warning this evening. We will see how our floating emergence traps fare.. the joys of outdoor mesocosms! @masonsward.bsky.social
Mesocosm tanks in a field with insect emergence traps
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The Ricciardians @ricciardilab.bsky.social · 27/05/2025
www.biographic.com/a-home-made-...
biographic.com
A Home Made of Microplastics - bioGraphic
Caddisfly cases from museum collections reveal that microplastics infiltrated “pristine” freshwater environments far earlier than suspected.
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Fiona Mathews @fionamathews.bsky.social · 23/05/2025
Plastic is everywhere. Even in earthworms! Find out about our new research funded by @hedgehogsociety.bsky.social and @sussex.ac.uk. www.bbc.co.uk/news/article... @emilyzoologist1.bsky.social
bbc.co.uk
Plastic in every level of food web, say Sussex scientists
The university study analyses more than 580 invertebrate samples from 51 sites across Sussex.
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Jon Sweetman @jonsweetman.bsky.social · 22/05/2025
Thanks for a great meeting @freshwaterscience.bsky.social!
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Matthew A. Barnes @drbarnes.org · 21/05/2025
Party on! Really enjoyable talk by Mason Ward about invertebrate residents of vernal ponds and their determinants at #sfs2025
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Jon Sweetman @jonsweetman.bsky.social · 07/05/2025
Setting up and filling mesocosms today with @masonsward.bsky.social M
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Jon Sweetman @jonsweetman.bsky.social · 26/04/2025
Pulling mesocosm tanks out of storage and cleaning them in preparation for summer experiment! Quill was happy to come out and help..
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Society for Freshwater Science @freshwaterscience.bsky.social · 23/04/2025
📣Join the Early Career Committee for their workshop on navigating mentorship in freshwater science! 📆Thursday, May 9, 12:00 PM EST 🌐Registration: ua-edu.zoom.us/meeting/regi...
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Miguel A Gómez Serrano @gomezserrano-ma.bsky.social · 13/04/2025
Freshwater macroinvertebrates have been incorporating microplastics for more than 50 years. 👇 Caddisfly cases with plastics from 1971 and 1986 Paper: www.sciencedirect.com/science/arti... and @science.org news: www.science.org/content/arti...
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Jon Sweetman @jonsweetman.bsky.social · 03/04/2025
Crane fly larvae (Tipulidae) Nice big chonker (technical term)..
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Jon Sweetman @jonsweetman.bsky.social · 03/04/2025
Sampling aquatic invertebrate substrate cages with PhD student Ibrahim Fagbohun and colleague Dan Allen in Maryland today. A little drizzly but otherwise good field day!
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Jon Sweetman @jonsweetman.bsky.social · 21/03/2025
Eubranchipus vernalis (Branchiopoda: Anostraca). eastern fairy shrimp #macroinvertebrates #fairyshrimp
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Jon Sweetman @jonsweetman.bsky.social · 21/03/2025
Happy Spring! Fairy shrimp (Eubranchipus vernalis) are hatching in the local vernal ponds
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Jon Sweetman @jonsweetman.bsky.social · 30/01/2025
A cool burrowing mayfly (Ephemeroptera: Ephemeridae) from eastern North America - from last year's class samples from a stream in central Pennsylvania. Litobrancha recurvata (McCafferty, 1971). #macroinvertebrates #Ephemeroptera
Litobranch recurvata (Ephemeroptera: Ephemeridae) larvaeMandibular tusksAntennae lack the big whorl like setae like in Hexagenia1st abdominal gill is small, a single filament
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NOAA Climate.gov @climate.noaa.gov · 28/01/2025
Welcome to Climate.gov & thanks for following us! Let us introduce ourselves. We provide timely & authoritative scientific data & information about climate science, adaptation, & mitigation. In short, our mission is to provide science & information for a climate-smart nation.
climate.gov
Climate.gov Home
Science & information for a climate-smart nation
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Jon Sweetman @jonsweetman.bsky.social · 17/01/2025
Winter sampling with my aquatic invertebrate ecology class! Always impressed in how diverse and abundant these streams are in the winter.
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Jon Sweetman @jonsweetman.bsky.social · 02/01/2025
Happy New Year! A couple pictures of an Ameletus spp, the comb-mouthed minnow mayfly. (Ephemeroptera: Ameletidae)
Ameletus (Ephemeroptera) showing distinctive row of comb-like spines on the maxillaeAmeletus spp. (Ephemeroptera: Ameletidae)
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Donna Giberson (Elbows UP!) 🇨🇦🇺🇦 @donnag.bsky.social · 02/12/2024
Let's get #MayflyMonday going! Here's a pretty little Epeorus from Yukon in northern Canada.
a dorsal (top) view of a mayfly larva called Epeorus longimanus. The mayfly is quite flat (it belongs to the flat-headed mayfly group), with a wide flat head. The general body shape is oval, with large oval gills extending from the sides of the abdomen, and long tails. It is pale cream in colour, with dark markings all over its body.
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Jon Sweetman @jonsweetman.bsky.social · 02/12/2024
Mayfly gills are amazingly diverse. Often the fragile gills of Family Leptophlebiidae fall off in preserved specimens, but sometimes their relatively intact #mayflymonday #Ephemeroptera #macroinvertebrates
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Andrea Kirkwood (she/her) @kirkwoodlab.bsky.social · 29/11/2024
MSc Opportunity: Conservation and Restoration of Aquatic Diversity in the face of Legacy and Emerging Stressors (CRADLES) project is seeking a MSc student to develop novel stream biomonitoring methods incorporating eDNA to assay communities. See further details below & ALT text. #AcademicSky
We are currently seeking a MSc domestic student (i.e. Canadian citizen or permanent resident). The project will focus on developing and testing novel stream biomonitoring methods incorporating eDNA to assay community membership from microbes to fish. These rapid bioassessment techniques will be tested against traditional approaches in their ability to produce functional, community and multitrophic indicators of ecosystem integrity and biodiversity along a gradient of impact recovery. The student will be hosted at Laurentian University (Dr. Brie Edwards) and co-supervised by Dr. Erik Emilson (Natural Resources Canada). The advisory committee for the project will also include PIs from more than a single institution, and will reflect the collaborative, team-based approach to the research, both in lab and field environments. Additional project collaborators are located at Queen's, Laurier, Ontario Tech and Acadia universities, and in MNR and MECP. Field work will begin in Spring of 2025 and will be conducted in the Sudbury area. Ideal candidates will have a strong background in aquatic ecology and an interest in benthic bioindicators, molecular techniques, and population and community responses to environmental change. Quantitative skills in statistical analysis are desired but can be provided through training programs at the respective institutions. Interested students should send a CV, cover letter expressing interest and relevant skills, as well as a copy of unofficial transcripts to Brie Edwards (bedwards2@laurentian.ca). Please include “CRADLES graduate interest” as the subject line. Review of applications will occur as they are received, but only those selected for an interview will be contacted. While the positions are targeted at domestic students, we encourage all qualified applicants from diverse cultural backgrounds and gender identities, Indigenous persons, women and visible minorities to apply.
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Dr. Dawn Wright @deepseadawn.bsky.social · 27/11/2024
"How to stop plastic pollution: three strategies that actually work" Countries are meeting to agree the first ever global treaty on curbing plastic pollution. Research suggests where bans and incentives can make a difference. www.nature.com/articles/d41...
nature.com
How to stop plastic pollution: three strategies that actually work
Countries are meeting to agree the first ever global treaty on curbing plastic pollution. Research suggests where bans and incentives can make a difference.
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Darrin Hunt @benthicbuddy.bsky.social · 28/11/2024
Our little aquatic bug pack is growing! Let’s keep on with it! Like, repost and let me know if you want to be added! go.bsky.app/F3WGCuV
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Jon Sweetman @jonsweetman.bsky.social · 27/11/2024
Hydropsyche (Hydropsychidae: Trichoptera). Drawing from Wiggins, 1996..
HydropsycheDorsal view showing sclerites and prosternal plateFrom (Wiggins, 1996)
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Jon Sweetman @jonsweetman.bsky.social · 27/11/2024
Cheumatopsyche (Hydropsychidae: Trichoptera)
Cheumatopsyche (Hydropsychidae: Trichoptera)small scleritesNotched frontoclypeus of Cheumatopsyche spp.ventral view from Wiggins, 1996
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Jon Sweetman @jonsweetman.bsky.social · 22/11/2024
Do you even flex, bro? Drunella spp. (Ephemeroptera: Ephemerellidae) #macroinvertebrates #Ephemeroptera #mayflies #FlexFridays
DrunellaDrunella spp. showing enlarged femurs and frontoclypeal projections
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SFS Students @sfs-src.bsky.social · 21/11/2024
Do you want to test your knowledge of freshwater trivia?? We are hosting a zoom trivia event on December 4th at 7 pm EST. Please use the following link to register for the event! shorturl.at/fBqCv
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Jon Sweetman @jonsweetman.bsky.social · 22/11/2024
Mayfly larvae from Family Siphlonuridae (Ephemeroptera), central Pennsylvania, USA #macroinvertebrates #Ephemeroptera
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Jon Sweetman @jonsweetman.bsky.social · 22/11/2024
Job Alert! My Department in Ecosystem Science & Management at Penn State University is also currently hiring two TT positions . Please spread widely. Assistant Professor of Forest Ecophysiology tinyurl.com/yc7xtbs2 Assistant Professor of Soil-Water Interactions tinyurl.com/2drjp2xn
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Jon Sweetman @jonsweetman.bsky.social · 22/11/2024
Job Alert: My Department At Penn State University is currently hiring a Department Head! Please share widely! Department Head, Department of Ecosystem Science and Management tinyurl.com/3ut96uwd
We're hiring - faculty positions in the Department of Ecosystem Science & Management, Penn State University
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Jon Sweetman @jonsweetman.bsky.social · 18/11/2024
Spot the stonefly larvae! #Plecoptera #MacroinvertebrateMonday
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Jon Sweetman @jonsweetman.bsky.social · 18/11/2024
Fieldwork sampling macroinvertebrates in streams outside of Baltimore in early November with new PhD student Ibrahim Fagbohun and my colleague Dan Allen. Seeing how our new substrate samplers work (filled with either rocks or Leaves). #macroinvertebrates #FallFieldwork
Ibrahim Fagbohun and Dan Allen sorting invertebrates in the fieldMacroinvertebrate cage samplersPhD student Ibrahim Fagbohun sampling invertebrates
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Science Furs @scifurs.bsky.social · 25/10/2024
Twenty years of microplastic pollution research—what have we learned? Science www.science.org/doi/10.1126/...
science.org
Twenty years of microplastic pollution research—what have we learned?
Twenty years after the first publication that used the term microplastic, we review current understanding, refine definitions, and consider future prospects. Microplastics arise from multiple sources,...
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Jon Sweetman @jonsweetman.bsky.social · 18/11/2024
Enjoyed a break from social media, but ready to reengage. Hi all! I’m a freshwater ecologist interested in understanding our impacts on aquatic ecosystems.
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