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Emily Cohen

@emlbcohen.bsky.social
144 followers 158 following 1 posts

Animal Migration Research Group

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Reposted by Emily Cohen
Steph Szarmach @stephszarmach.bsky.social · 23/01/2026
Out now in Movement Ecology: We used multi-sensor geolocators to track myrtle warblers breeding in Alaska and found that they migrated much farther than expected to the Gulf Coast—rather than to the closer Pacific Coast non-breeding area 🪶🧵 link.springer.com/article/10.1...
Left panel: A small black, grey, white and yellow songbird wearing a tracking backpack. Right panel: A map of North America showing a migration track beginning in Alaska, crossing east across the boreal forest of Canada, and then turning south to the coast of Texas before retracing the path north.
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University of Maryland Center for Environmental Science @umces.bsky.social · 20/01/2026
Research conducted at UMCES Appalachian Laboratory found that changes in songbirds’ abundance & migration timing—often in response to climate change and habitat disturbances—are causing dramatic shifts in the bird species commonly seen together during migration. www.umces.edu/content/umce...
umces.edu
UMCES Research Finds Climate Change and Species Declines Are Reshaping Communities of Migrating Birds
A new study published in Global Change Biology advances our knowledge about migratory bird communities and confirms shifts in the bird species we see together during migration; information that could ...
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Cecilia Nilsson @cnilsson.science · 09/12/2025
Incredibly honoured and happy to have been awarded a consolidator grant from the ERC! This grant will expand my group and fund my research at @biologylu.bsky.social for five years, and focus on different factors that disrupt animal migration at large scales 🦅🦋🌍🧲💡🌡️. Exciting times ahead!
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Kyle Horton @kyle-horton.bsky.social · 20/11/2025
Take three minutes to look at pretty birds, explore radar data, and see how we connect the structure of skies to MacArthur's ideas of niche partitioning. 📡🐦☁️🎧
youtu.be
Structuring the skies: Diel dynamics of migratory animalmovement in the lower atmosphere
YouTube video by Kyle Horton
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Batumi Raptor Count @batumiraptorcount.org · 18/11/2025
A typical Batumi migration scene, illustrating the idea of an ‘aerial niche’. For Steppe Buzzards in our bottleneck, that niche is often somewhere between the clouds: great to watch, tricky to count. Fascinating paper by @cnilsson.science et al: doi.org/10.1016/j.tr... 📸 @barthoekstra.bsky.social
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Cecilia Nilsson @cnilsson.science · 17/11/2025
So proud of this cover that features @barthoekstra.bsky.social amazing photo!
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Trends in Ecology & Evolution @cp-trendsecolevo.bsky.social · 12/11/2025
November issue out online now www.cell.com/ecology-evol... We hope you enjoy it! The cover article is by Cecilia Nilsson and colleagues, photo by Bart Hoekstra The penultimate interviews in our Disability series feature John Dennehy and Tara Cronin
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Bart Hoekstra @barthoekstra.bsky.social · 30/10/2025
To reduce negative impacts of #renewables (eg #windenergy) on migrating birds, we need to know *where* and how *high* they fly. Using weather radar, we mapped 6yrs of nocturnal migration over the Netherlands, revealing patterns we can use to avoid and minimize impacts: doi.org/10.1016/j.je... 🧪🪶
Fig. 2. Maps of nocturnal bird migration across the Netherlands in spring and autumn, with the 100 km radius circles of the weather radars enclosing the onshore study area. Colors represent seasonal migration passage, converted from the original bird densities. Shaded areas mark grid cells for which over 25% of the input data, prior to filtering, were impacted by ground clutter. Migration passage in these regions may be compromised in either direction: overestimated due to remaining clutter artifacts or underestimated where terrain features partially obstruct the radar’s lower scanning angles.Fig. 1. Flight altitude distributions (in m above sea level (asl)) of nocturnal bird migration for both Dutch weather radars at a coastal Den Helder and inland site Herwijnen. Bar length denotes the proportion of migration within the respective altitude range (50 m vertical resolution). Donut charts aggregate this further to coarser 200-m classes and display the proportion of migration occurring above 1000 m (patterned). Red highlights indicate the altitude range of onshore energy infrastructure in the Netherlands, which is generally present in the lowest 200 m of the atmosphere. Donut chart proportions do not sum to 100% due to rounding. The small inset map of the Netherlands shows the locations of both radars (solid dots) and the surrounding areas up to 35 km (circles) from which altitude distributions are aggregated.Fig. 3. a, c Observed combinations of migration passage and mean wind power density, a measure of wind power potential, in North-Holland. Red circles represent average values for candidate sites and their size reflects the relative candidate site area. The grid reflects binned values of migration and wind power density, with color shading indicating the type of combination: orange = high migration passage, blue = high wind power density, dark browns and blues = both high. White lines indicate averages for wind power density and seasonal migration passage. b Spatial distribution of autumn migration (orange hues) and wind energy (blue hues) in North-Holland. Candidate wind energy sites are shown in bright red. The highest and lowest autumn migration passage sites are linked to their positions in a and c, emphasizing large differences between sites in autumn, but not in spring. Shaded areas mark grid cells for which over 25% of the input data, prior to filtering, were impacted by ground clutter. Migration passage in these regions may be compromised in either direction: overestimated due to remaining clutter artifacts or underestimated where terrain features partially obstruct the radar’s lower scanning angles.
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British Ornithologists’ Union (BOU) @bou.org.uk · 16/10/2025
The structure of the annual migratory flight activity in a songbird | royalsocietypublishi... | Proceedings of the Royal Society B | #ornithology 🪶
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Kyle Horton @kyle-horton.bsky.social · 16/10/2025
Interested in how animals use the sky? 🌌 I’m recruiting a PhD student (Fall 2026, Purdue University) to study Purple Martin flight behavior and airspace use using barometric transmitters. Details ➡️ jobs.rwfm.tamu.edu/view-job/?id... #Aeroecology #AvianEcology
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Wilson Ornithological Society @wilsonornithsoc.bsky.social · 06/10/2025
New radar research is revealing how long-distance bird migrants change the pace of their migration once they reach South America. #ornithology
allaboutbirds.org
In South America, Bird Migration Is Slow and Steady
Blackburnian Warbler in Colombia by Linda Rudolph / Macaulay Library. From the Autumn 2025 issue of Living Bird magazine. Subscribe now. For birders in the U.S. and Canada, fall migration means the…
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Department of Biology, Lund University @biologylu.bsky.social · 06/10/2025
High above us, the atmosphere is teeming with life. New research from @cnilsson.science at Lund University reveals how the atmosphere is an ecosystem, with complex ecological processes that affect how animals move between different altitude levels of the airspace. www.biology.lu.se/article/hidd...
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Kyle Horton @kyle-horton.bsky.social · 25/09/2025
Truly impressive number of birds migrating tonight. More than 800 MILLION birds up in the air right now❗ #BirdMigration
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Kyle Horton @kyle-horton.bsky.social · 22/09/2025
7-Day Bird Migration Forecast We’re entering the peak of fall migration across most of the U.S. Hundreds of millions of birds are on the move, with Thursday and Friday forecast to be the biggest nights of the season so far — over 400 million birds predicted to be taking flight.
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Cecilia Nilsson @cnilsson.science · 22/09/2025
Are animals randomly distributed in the air, or is there a structure to where and when we find them? In our new paper we outline factors that shape habitat use in the air, from abiotic structure to biotic interactions. A lot of fun discussions behind this one! 🦅🦋🦇🌬 www.cell.com/trends/ecolo...
cell.com
Animal niches in the airspace
For flying animals, including many birds, bats, and insects, the air is a crucial arena for a range of behaviors. Technological advances, such as year-round tracking of flight altitudes and expanded u...
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Trends in Ecology & Evolution @cp-trendsecolevo.bsky.social · 19/09/2025
Online now: Animal niches in the airspace
dlvr.it
Animal niches in the airspace
For flying animals, including many birds, bats, and insects, the air is a crucial arena for a range of behaviors. Technological advances, such as year-round tracking of flight altitudes and expanded use of radar, increasingly show how flying animals use the aerial habitat. This enables us to answer questions about the environmental patterns and ecological processes that shape aerial niches, including energetics, biotic interactions, and risk due to growing anthropogenic conflicts. In this review, we identify environmental conditions and biological interactions influencing where animals occur in the airspace throughout their life cycles. We outline an ecological framework to advance understanding of how different properties of the airspace shape fundamental aerial habitat niches and how biotic interactions influence the realized niches.
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Camille Thomas-Bulle @camillethomasbulle.bsky.social · 19/08/2025
Very excited to show the results of this work for the first time! Shout out to my amazing collaborators @joely-desimone.bsky.social @cenemes.bsky.social Brian Tsuru, Meredith Anderson, Colette Berg, Cat David and @emlbcohen.bsky.social
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Fengyi Guo (Freda) @fyguo.bsky.social · 30/05/2025
4. Flight Behaviors: Birds fly faster (higher airspeeds) and are more selective about flying with tailwinds over the Corn Belt compared to more forested landscapes. This is similar to their strategies for crossing natural barriers like the Gulf of Mexico.
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Fengyi Guo (Freda) @fyguo.bsky.social · 30/05/2025
1. Did you know that the Corn Belt in the Midwest USA is so vast you can see it from space? 🌽 How would this affect billions of migrating songbirds passing through each year? 🐦 Check out our new study in @conbiology.bsky.social to find out! 🧵1/8 conbio.onlinelibrary.wiley.com/doi/10.1111/...
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Science Friday @scifri.bsky.social · 19/05/2025
Birders, we need your help! Call and tell us your high-drama bird tales: 877-4-SCIFRI
When was the last time birding give you a thrill? Did you fall out of a tree when you saw a Kirtland's warbler? 
Call and tell us your high-drama birding tales: 877-4-SCIFRI
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Robert Fletcher @fletcherecology.bsky.social · 25/04/2025
Really excited to share this new article from the lab. We synthesize the profound importance of movement and connectivity for conservation and provide a vision for future policy and management. Let's work toward a well-connected planet for biodiversity and people: www.science.org/doi/10.1126/...
science.org
A well-connected Earth: The science and conservation of organismal movement
Global biodiversity targets focus on landscape and seascape connectivity as a foundational component of biodiversity conservation, including networks of connected protected areas. Recent advances allo...
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David Toews @davetoews.bsky.social · 16/04/2025
A lot of blood sweat and tears put into this one: we revisit Robert MacArthur's classic warbler study—with @eliotmiller.bsky.social and colleagues—using, among other techniques, fecal metabarcoding. 🧪🦉 📸 Ronnie d'Entremont royalsocietypublishing.org/doi/10.1098/... @psubiodept.bsky.social
royalsocietypublishing.org
Reassessing niche partitioning in MacArthur’s warblers: foraging behaviour, morphology and diet differentiation in a phylogenetic context | Biology Letters
Owing in large part to Robert MacArthur’s classic research, wood warblers in the family Parulidae are textbook exemplars of species competition and niche partitioning. Conventional wisdom suggests tha...
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Claire Nemes @cenemes.bsky.social · 05/04/2025
Brilliant and thought-provoking new paper by @silasfischer.bsky.social with real-world consequences for ecological knowledge and conservation!
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Tessa Rhinehart @tessarhinehart.bsky.social · 11/03/2025
Bird #bioacoustics folks: @kitzeslab.bsky.social is hosting a hands-on "Advanced topics in bioacoustic monitoring" workshop at AOS 2025! We'll make custom sound ID models, estimate birds' positions using acoustic localization, and discuss how to use sound ID results to make ecological insights.
meeting.americanornithology.org
Workshops & Training Opportunities - AOS 2025 Annual Meeting
The workshops and training sessions at AOS 2025 offer opportunities both for hands-on learning exercises, where participants engage in a mix of lectures and activities, and for panel discussions on a ...
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Emily Cohen @emlbcohen.bsky.social · 09/03/2025
#standupforscience DC on Friday
Poster with bald eagle and legislation that has supported the species recovery Stand up for science signsStand up for science crowd and signPeople at the rally
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Reposted by Emily Cohen
Claire Nemes @cenemes.bsky.social · 08/03/2025
Thousands of scientists at the #standupforscience2025 @standupforscience.bsky.social protest in DC today demonstrate that we won’t take the attack on science and the federal government lying down!
A person in a blue jacket with her back to the camera holds up a sign with the ohm symbol and the word “resistance” at the Stand Up for Science rallyA person holds a sign displaying the federal legislation and agencies that protect Bald Eagles in the US at the Stand Up for Science rallyA view of the Lincoln Memorial with trees in the foreground and thousands of marchers at the Stand Up for Science rally
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Stand Up for Science! @standupforscience.net · 12/02/2025
Welcome to the Bluesky account for Stand Up for Science 2025! Keep an eye on this space for updates, event information, and ways to get involved. We can't wait to see everyone #standupforscience2025 on March 7th, both in DC and locations nationwide! #scienceforall #sciencenotsilence
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Wilson Ornithological Society @wilsonornithsoc.bsky.social · 28/02/2025
Happy Friday! We made it through another week. Take care of yourself this weekend, and try to fit in some time in nature. 🐦🌳🍃
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Carl T. Bergstrom @carlbergstrom.com · 22/02/2025
Any talk you hear from the current administration about making the US more competitive in science and technology is utter bullshit. What they are doing is sabotaging our country for years if not decades to come.
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Liz Neeley @lizneeley.bsky.social · 15/02/2025
We do this all to stay focused, not flooded. I share the sense we’ve made in a late Friday night debrief. There is a lot to feel sad & sick about. I can’t tell you things will be okay, but I can tell you A LOT about efforts to make it better. This was week 4. buttondown.com/liminalcreat...
buttondown.com
Week 4
Figuring out what to focus on now & what to focus on next in science and higher ed
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Katie Langin @klangin.bsky.social · 22/02/2025
"These kinds of shocks are going to lead to a mass exodus … for minorities in particular.” For my latest @science.org story, I spoke with early career researchers who have been affected by the federal upheaval and are concerned about what it means for their future. www.science.org/content/arti...
science.org
U.S. early-career researchers struggling amid chaos
Uncertain funding, government firings, and distressed universities hit vulnerable groups especially hard
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Rep. Jamie Raskin @raskin.house.gov · 22/02/2025
MaryBeth Hastings has devoted her career to human rights, one of the many people in #MD08 who have seen their lives, livelihood and work upended by the attacks on USAID. Thanks MaryBeth for reminding us: foreign aid is critical for democratic solidarity.
youtu.be
Local Hero Video Series: Week 248 Feat. MaryBeth Hastings
YouTube video by Rep. Jamie Raskin
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Stand Up for Science! @standupforscience.net · 21/02/2025
📣 TWO WEEKS UNTIL WE STAND UP FOR SCIENCE! 📣 On March 7th, we’re Standing Up for Science in DC & ALL 50 STATES to make our voices heard. We hope you’ll join us! ☀️ #sciencenotsilence #scienceforall #standupforscience2025
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Matt Carling @mdcarling.bsky.social · 21/02/2025
As a small token of gratitude, Kudoboards have been setup to allow the PI community to give thanks to these tireless public servants, who dedicated their careers not to the pursuit of their own research goals, but to helping us achieve ours. 2/3
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Wilson Ornithological Society @wilsonornithsoc.bsky.social · 19/02/2025
There's a new guest post on the WOS blog! WOS Research Award recipient @mikkojimenez.bsky.social writes about his efforts to ground-truth radar #ornithology data in Colorado.
wilsonsociety.org
Guest Post – Radar vs. Reality: Ground-Truthing NEXRAD Estimates of Migrating Birds
Every birder I know has been influenced by the integration of radar into ornithology.
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The Institute for Bird Populations @instbirdpop.bsky.social · 18/02/2025
🪶Do you need a bird break?
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Matt Carling @mdcarling.bsky.social · 18/02/2025
This is absolutely devastating www.wired.com/story/nation...
wired.com
National Science Foundation Fires 168 Workers as Federal Purge Continues
Firings at the NSF included permanent employees who had already completed their one-year probationary period, as well as at-will workers.
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Maria Belotti @mariabelotti.bsky.social · 18/02/2025
For a video abstract, go here: www.youtube.com/watch?v=LdkD...
youtube.com
Radar revelations: insect availability influences parental provisioning in breeding Tree Swallows
YouTube video by Kyle Horton
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Tim O'Connell @tinosaurs.bsky.social · 18/02/2025
Interested in ornithological Flocks? Have some spare change to help us keep the project going until we can secure private funding? Cool, we'll take whatever you've got –– and thanks! gofund.me/68737e3a
It's not easy to build a career in ornithology: Not only is compensation well below that of other careers that demand similar investments in education and experience, but opportunities are unpredictable in time and space. 

In recent years, the National Science Foundation has been interested in learning more retention of talented, trained people in science careers. 

I am part of a team that convinced the NSF a few years ago that ornithology could make an enlightening case study of this issue. We wanted to investigate the role that our professional societies could play in building a sense of community and belonging, especially for people at vulnerable points in their careers or for whom that community wasn't self-evident.

These concepts are a bit squishy for those of us who don't normally work in the social sciences or the business world, but we're studying *affinity groups*, i.e., people organized around a similar interest or experience within a larger group. For example, career stage is an affinity group. Of course, because we're working specifically on ornithological careers, we call our affinity groups *flocks*.

Three ornithological societies collaborate on the effort. We surveyed the memberships of these societies and found that a lot of people were interested in joining –– and even leading –– Flocks!

We've been preparing for an official launch of the first user-defined Flocks at the annual meetings this summer of 2025. This *should have been* just as phase I (design) funding was closing and new phase II (implementation) would open up.  

Of course, that funding went *poof*, and now we're trying to buy some time to go ahead with this summer's launch while we seek private foundation support beyond that. 

Hence this fundraising call. If you've read this far in and are at all interested and you've found a few coins in the couch cushions you don't need for eggs or whatever, we'll take 'em. Thanks!
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Katie Langin @klangin.bsky.social · 14/02/2025
Dear federal scientists: If you have been affected by the probationary firings and would be willing to speak with Science, please reach out to me by email (klangin@aaas.org) or on Signal. We can guarantee annonymity.
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