Research dossierORCID 0000-0002-8604-7066
Point Blue Conservation Science · 2 affiliations on record
Valency read your published work and assembled this dossier automatically. Every figure links to the real paper behind it.
149 works, 5,002 citations, h-index 41, and decades of Ross Sea penguin data now feeding Antarctic climate and disease science.
Across 149 works, the Ross Sea Adélie penguin runs through almost everything you do. You have followed individually marked birds for decades, tying their survival and breeding to how efficiently they forage and to the sea ice around them. The trophic-cascade work places those penguins inside a food web of whales, krill and silverfish. The marine-predator tracking scales the same instinct up to the whole Southern Ocean, turning where animals travel into where protection should go. Your team also reads the viruses these animals carry, sampled straight from the colony. Here is how that work looks from outside.
Your most-cited work splits into two method lines that keep meeting. One is long-term, individual-based demography: decades of marked Adélie penguins in the Ross Sea, where survival tracks breeding quality and foraging efficiency, carrying 128 and 133 citations on the quality-and-foraging papers. The other is large-scale spatial ecology, the Nature tracking synthesis that pooled thousands of predator tracks to find Areas of Ecological Significance across the Southern Ocean at 275 citations. The 2006 trophic-cascade paper sits between them, reading the same penguins as one part of a Ross Sea food web.
Your citations concentrate in a few places: the Southern Ocean predator-tracking paper in Nature, the Ross Sea trophic-cascade study, and the individual-quality and foraging-efficiency work on Adélie penguins. The long-term Ross Sea demography is the through-line under most of it.
Your tracking synthesis travels furthest and into the most fields. Its heaviest citers are movement-ecology syntheses like the big-data animal-movement review at 518 citations, and its newest ones run straight into Antarctic conservation indices and the H5N1 outbreak now reaching Southern Ocean wildlife. The Ross Sea trophic-cascade paper feeds predator-interaction and mesopredator-release theory, cited by field staples at 1,303 and 886 citations. Your Adélie population record is being read back through time, into a Holocene reconstruction from sedimentary DNA, and the penguin virology reaches ancient-virus work and other wildlife viromes.
20091,303 citesRitchie, Euan G, Johnson, Christopher N
A heavily cited synthesis of predator interactions and mesopredator release that draws on trophic-cascade evidence like your western Ross Sea study.
2009886 citesBaum, Julia K, Worm, Boris
Links declines in oceanic predators to cascading food-web effects, building on the top-down cascade thinking your penguin-and-cetacean work helped ground.
2022518 citesNathan, Ran, Monk, Christopher T, et al.
A synthesis of how large movement datasets are reshaping animal-movement ecology, citing your multispecies Southern Ocean tracking effort.
20260 citesVerzuh, Tana, Torstenson, Martha, et al.
Proposes shared tools and terms to connect animal-movement tracking with conservation practice, extending the tracking-to-protection logic your Southern Ocean synthesis put to work.
20260 citesDuVivier, Alice K, Krumhardt, Kristen M, et al.
Builds an index of ecological value across trophic levels for the Antarctic, drawing on the kind of predator distributions your tracking work mapped.
20261 citesYounger, J. L., Patier, L., et al.
Documents multiple H5N1 introductions and the first confirmed infection of ice-dependent seals in Antarctica, citing your Southern Ocean predator work as it maps the outbreak onto those species.
20251 citesWood, Jamie R, Cole, Theresa L, et al.
Reconstructs Holocene Adélie penguin population history in the Ross Sea from sedimentary DNA, extending your modern colony-trend record deep into the past.
Closely related preprints working the same problems as you.
Revealing the Widespread Bias of Extinction Risk in the Antarctic and the Southern Ocean
Builds the first region-wide extinction-risk baseline for the Antarctic and Southern Ocean and finds Antarctic birds disproportionately threatened, the prioritization your predator-tracking maps are meant to inform.
RNA virus genomes from centuries- to millennia-old Adelie penguin mummies
Recovers RNA virus genomes from ancient Adélie penguin mummies, pushing the penguin virology your Cape Crozier sampling opened back through deep time.
When a paper cites you but we don't hold its full text, we flag it, so you can tell first-hand sources from second-hand mentions.
The collaborators pulling hardest away from your penguin-demography center are the virologists Arvind Varsani and Simona Kraberger, who show up only on the wildlife-virus papers and sit in microbiology rather than seabird ecology. The dense core is the long-term Ross Sea Adélie team: David Ainley above all, your closest collaborator across 18 of these papers and, counted from his side, 29 in all, alongside Katie Dugger, Amélie Lescroël, Phil Lyver and Melanie Massaro. That group co-authors heavily with one another and with you. Walker Smith and Stephen Votier sit one step out, reached through Ainley and Lescroël.
Three researchers keep landing next to your recent directions, none at your institutions and none with a paper co-authored with you. Cassandra Brooks works the conservation-policy side of turning tracking into protection. Jemma Geoghegan and Maria Ogrzewalska work the virology and disease side your penguin-virus sampling opened, which has turned urgent as H5N1 moves through Antarctic wildlife. Any of them on a workshop or grant would bring tools that meet yours from outside the circle.
Her Southern Ocean key-biodiversity-area work turns multispecies tracking into site-based protection, the same move your Nature tracking paper made, but from the policy and governance side and from outside your circle.
She shares no institution with you, she is at the University of Colorado Boulder, and she is not among your coauthors.
She runs metagenomic virome discovery across marine wildlife, including penguins and seals, the same non-invasive discovery approach behind your Cape Crozier penguin and seal virus work, with methods to turn it into ongoing surveillance.
She shares no institution with you, she is at the University of Otago, and no co-authored papers with you.
She leads active H5N1 and coronavirus surveillance in Antarctic seabirds and seals, the emerging threat now reaching the Ross Sea species you have tracked for decades.
She shares no institution with you, she is at Fundação Oswaldo Cruz in Brazil, and no co-authored papers with you.
Over the last 90 days your fields have converged on a changing Ross Sea and Southern Ocean: penguin demography under sea-ice loss, the H5N1 front arriving in the exact species you study, the prey base and food web being re-mapped, and energetics tying foraging to breeding. The disease dimension is new, and it lands squarely on your populations.
All five sit between what you already hold, decades of individually based Ross Sea demography plus a non-invasive virome program plus the tracking maps, and where your fields are heading. Three point outward to new people: Ogrzewalska on surveillance, Geoghegan on virome methods, Brooks on protection. The other two turn your own paired datasets, foraging against demography and virus against survival, onto questions your data are unusually well placed to answer. The thread running through all five is disease arriving in a system you have already spent decades measuring.
Every source below is real and linked. The directions, and the reading of them, are generated. Check anything you would lean on against your own knowledge of the field.
You hold one of the longest individually marked Adélie penguin demographic records in Antarctica, and the field is now forecasting penguin populations under sea-ice loss and ocean warming. H5N1 has just reached Antarctic wildlife and is killing skuas and seals in your study region, yet the population forecasts still treat climate as the only driver.
A search pairing Adélie penguin demographic projection with avian-influenza mortality returned disease-and-demography work only for other species, such as gannets, gulls and eared seals, next to climate-only penguin models. Nothing folds an H5N1 mortality shock into an Adélie or Ross Sea penguin population forecast.
Bring Maria Ogrzewalska's Antarctic H5N1 surveillance and genomic data together with your Ross Island survival and breeding time series to add a disease-mortality term to the penguin population forecast.
Your non-invasive sampling at Cape Crozier has already turned up papillomaviruses, a polyomavirus, a circovirus and anelloviruses across Adélie penguins, south polar skuas and Weddell seals, each described one host at a time. Marine-mammal virology is now moving to community-scale viral-sharing and spillover networks, but no one has built that cross-host picture for an Antarctic colony.
A search for a community-level viral-sharing network across Antarctic penguins, skuas and seals returned only single-host virome studies and a general marine-mammal viral-diversity paper. The cross-host sharing network for one Antarctic seabird and pinniped assemblage does not exist.
Work with Jemma Geoghegan to pool your Cape Crozier penguin, skua and seal virome samples into one metagenomic dataset and map which viruses move between hosts at the colony.
Your Nature tracking paper mapped Areas of Ecological Significance for Southern Ocean predators, and the field is refining protected-area design around climate refugia. With H5N1 now spreading through Antarctic seabirds and seals, no protected-area design yet asks where populations are buffered from disease as well as from climate.
A search for Antarctic marine-protected-area design that integrates disease refugia alongside climate refugia returned climate-refugia planning and Antarctic protected-area critiques, but nothing that brings disease risk into the spatial design.
With Cassandra Brooks, extend the Ross Sea and Southern Ocean protected-area case to test where predator aggregations overlap both climate-stable and lower-transmission areas.
Your work showed that better Adélie breeders forage more efficiently under hard conditions, and that penguins, whales and krill form a Ross Sea trophic cascade. New acoustic surveys now resolve how Antarctic krill and ice krill pack into swarms inside the Ross Sea MPA, but that prey structure has never been linked to individual penguin foraging efficiency or breeding quality.
A search coupling Ross Sea krill and ice-krill swarm dynamics with Adélie penguin foraging efficiency and breeding quality returned krill-connectivity and foraging-and-breeding studies separately, plus krill-population links on the Antarctic Peninsula, but no coupling of swarm structure to individual foraging efficiency in the Ross Sea.
Overlay the new Ross Sea krill and ice-krill swarm maps on your individual Adélie foraging tracks and breeding-quality index to test whether prey patchiness predicts who forages efficiently.
Antarctic viral surveillance, including your own faecal virus discovery, is cross-sectional: it records which viruses are present, not what they cost. Because you follow individually marked Adélie penguins across their lives at Cape Crozier, you can ask something surveillance alone cannot: whether infection predicts survival and breeding outcomes in known birds.
A search for non-invasive metagenomic surveillance tied to individual penguin survival and breeding returned Antarctic faecal surveillance and general metagenomic early-warning frameworks, none of them connected to individual-level demographic outcomes in a marked population.
Match viral detections from faecal samples at Cape Crozier to the survival and breeding records of the individually banded birds they came from, and test whether carriers pay a demographic cost.
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