Jon Sweetman
LightNews LightNews
banner
jonsweetman.bsky.social
Jon Sweetman
@jonsweetman.bsky.social
520 followers 320 following 25 posts
Assistant Research Professor in Aquatic Science 🇨🇦 at Pennsylvania State University. Freshwater Ecology, contaminants, paleolimnology, aquatic invertebrates
Posts Replies Media Videos
jonsweetman.bsky.social
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
June 10, 2025 at 1:45 AM
Reposted by Jon Sweetman
ricciardilab.bsky.social
www.biographic.com/a-home-made-...
A Home Made of Microplastics - bioGraphic
Caddisfly cases from museum collections reveal that microplastics infiltrated “pristine” freshwater environments far earlier than suspected.
www.biographic.com
May 27, 2025 at 3:59 AM
Reposted by Jon Sweetman
fionamathews.bsky.social
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
Plastic in every level of food web, say Sussex scientists
The university study analyses more than 580 invertebrate samples from 51 sites across Sussex.
www.bbc.co.uk
May 23, 2025 at 11:08 AM
jonsweetman.bsky.social
Thanks for a great meeting @freshwaterscience.bsky.social!
May 22, 2025 at 10:46 PM
Reposted by Jon Sweetman
drbarnes.org
Party on! Really enjoyable talk by Mason Ward about invertebrate residents of vernal ponds and their determinants at #sfs2025
May 21, 2025 at 6:27 PM
jonsweetman.bsky.social
Setting up and filling mesocosms today with @masonsward.bsky.social M
May 7, 2025 at 9:32 PM
jonsweetman.bsky.social
Pulling mesocosm tanks out of storage and cleaning them in preparation for summer experiment! Quill was happy to come out and help..
April 26, 2025 at 2:51 PM
Reposted by Jon Sweetman
freshwaterscience.bsky.social
📣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...
April 23, 2025 at 11:05 AM
Reposted by Jon Sweetman
gomezserrano-ma.bsky.social
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...
April 13, 2025 at 8:08 AM
jonsweetman.bsky.social
Crane fly larvae (Tipulidae) Nice big chonker (technical term)..
April 3, 2025 at 9:41 PM
jonsweetman.bsky.social
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!
April 3, 2025 at 6:05 PM
jonsweetman.bsky.social
Eubranchipus vernalis (Branchiopoda: Anostraca). eastern fairy shrimp #macroinvertebrates #fairyshrimp
March 21, 2025 at 4:40 PM
jonsweetman.bsky.social
Happy Spring! Fairy shrimp (Eubranchipus vernalis) are hatching in the local vernal
ponds
March 21, 2025 at 2:40 PM
jonsweetman.bsky.social
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) larvae Mandibular tusks Antennae lack the big whorl like setae like in Hexagenia 1st abdominal gill is small, a single filament
January 30, 2025 at 7:05 PM
Reposted by Jon Sweetman
climate.noaa.gov
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 Home
Science & information for a climate-smart nation
Climate.gov
January 28, 2025 at 5:50 PM
jonsweetman.bsky.social
Winter sampling with my aquatic invertebrate ecology class! Always impressed in how diverse and abundant these streams are in the winter.
January 17, 2025 at 4:08 PM
jonsweetman.bsky.social
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 maxillae Ameletus spp. (Ephemeroptera: Ameletidae)
January 2, 2025 at 1:58 PM
Reposted by Jon Sweetman
donnag.bsky.social
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.
December 2, 2024 at 9:28 PM
jonsweetman.bsky.social
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
December 2, 2024 at 8:35 PM
Reposted by Jon Sweetman
kirkwoodlab.bsky.social
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.
November 29, 2024 at 4:10 PM
Reposted by Jon Sweetman
deepseadawn.bsky.social
"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...
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
November 27, 2024 at 10:05 PM
Reposted by Jon Sweetman
benthicbuddy.bsky.social
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
November 28, 2024 at 2:58 PM
jonsweetman.bsky.social
Hydropsyche (Hydropsychidae: Trichoptera). Drawing from Wiggins, 1996..
Hydropsyche Dorsal view showing sclerites and prosternal plate From (Wiggins, 1996)
November 27, 2024 at 3:03 PM
jonsweetman.bsky.social
Cheumatopsyche (Hydropsychidae: Trichoptera)
Cheumatopsyche (Hydropsychidae: Trichoptera) small sclerites Notched frontoclypeus of Cheumatopsyche spp. ventral view from Wiggins, 1996
November 27, 2024 at 3:00 PM
jonsweetman.bsky.social
Do you even flex, bro?
Drunella spp. (Ephemeroptera: Ephemerellidae) #macroinvertebrates #Ephemeroptera #mayflies #FlexFridays
Drunella Drunella spp. showing enlarged femurs and frontoclypeal projections
November 22, 2024 at 7:51 PM