A framework for contextualizing social‐ecological biases in contributory science data
Open accessAbstract
Contributory science—including citizen and community science—allows scientists to leverage participant‐generated data while providing an opportunity for engaging with local community members. Data yielded by participant‐generated biodiversity platforms allow professional scientists to answer ecological and evolutionary questions across both geographic and temporal scales, which is incredibly valuable for conservation efforts. The data reported to contributory biodiversity platforms, such as eBird and iNaturalist, can be driven by social and ecological variables, leading to biased data. Though empirical work has highlighted the biases in contributory data, little work has articulated how biases arise in contributory data and the societal consequences of these biases. We present a conceptual framework illustrating how social and ecological variables create bias in contributory science data. In this framework, we present four filters— participation , detectability , sampling and preference —that ultimately shape the type and location of contributory biodiversity data. We leverage this framework to examine data from the largest contributory science platforms—eBird and iNaturalist—in St. Louis, Missouri, the United States, and discuss the potential consequences of biased data. Lastly, we conclude by providing several recommendations for researchers and institutions to move towards a more inclusive field. With these recommendations, we provide opportunities to ameliorate biases in contributory data and an opportunity to practice equitable biodiversity conservation. Read the free Plain Language Summary for this article on the Journal blog.
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Individuals may be more inclined to report individuals with charismatic coloration compared to those of regular coloration when contributing to community-gathered data.
“However, we caution the use of community-gathered data as individuals may be more inclined to report individuals with charismatic coloration compared to those of regular coloration (Husby, 2017;Zbyryt et al., 2021;Carlen et al. 2024).”
From Of Rarity and Symbolism: Understanding Human Perceptions of Charismatic Color Morphs (2024) · cites this paper as Carlen et al. 2024
The Figure 1 discussion says a preference filter favours colourful, charismatic species, and the St. Louis case study compares reports of colourful cardinals with reports of pigeons (page numbers unavailable). These passages support a possible reporting bias based on appearance, but they compare species, not individuals with charismatic versus regular coloration within a species. (LLM, conf=0.87)
Experimental — accuracy not yet measuredBiases in community-gathered data could lead to misinterpretations of the data.
“certainly has value, biases in these observations could lead to misinterpretations of the data (Dickman, 2010;Carlen et al. 2024).”
From Of Rarity and Symbolism: Understanding Human Perceptions of Charismatic Color Morphs (2024) · cites this paper as Carlen et al. 2024
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Estien, C. O., Fidino, M., Wilkinson, C. E., Morello-Frosch, R., & Schell, C. J. (2024) · Proceedings of the National Academy of Sciences of the United States of America · doi:10.1073/pnas.2321441121 · Cited by 27 · see citing works
Self-citationSorte, F. L. L., Cohen, J., & Jetz, W. (2024) · Diversity and Distributions: A journal of biological invasions and biodiversity · doi:10.1111/ddi.13863 · Cited by 22 · see citing works
“However, citizen science initiatives typically compile observations opportu - nistically and sporadically across space and time and the data often contains social, ecological, and taxonomic biases (Carlen et al., 2024; Di Cecco et al., 2021 ).”
Sierra, E., Gillespie, L. E., Soltani, S., Exposito-Alonso, M., & Kattenborn, T. (2024) · AAAI Conference on Artificial Intelligence · doi:10.1609/aaai.v39i27.35060 · Cited by 14
“Despite documenting the effects of five unique partitions, there are yet even more kinds of biases not tested here, and further complex interactions and intersections between these biases should be explored (Carlen et al. 2024; Bowler et al. 2022).”
A digital twin for real-time biodiversity forecasting with citizen science data
Ovaskainen, O., Winter, S., Tikhonov, G., Lauha, P., Lehtiö, A., Nokelainen, O., Abrego, N., Aroluoma, A., Harrison, J. P., Heikkinen, M., et al. (2026) · Nature Ecology & Evolution · doi:10.1038/s41559-025-02966-3 · Cited by 13 · see citing works
“Most critical observer-based biases in citizen science relate to heterogeneity in participation, detectability, sampling and preference 24 .”
Faxon, H., & Chapman, M. (2025) · Environmental Research Letters · doi:10.1088/1748-9326/add6b6 · Cited by 10 · see citing works
“Despite recent calls to contextualize socio-ecological bias and consider its consequences in contributory science (Carlen et al 2024), little scholarship in this field to date seeks to understand how these biases emerge and persist over time.”
Of Rarity and Symbolism: Understanding Human Perceptions of Charismatic Color Morphs
Williams, T. D., Kreling, S. E. S., Stanton, L. A., Wilkinson, C. E., Estien, C. O., Schell, C. J., & Carlen, E. J. (2024) · Human Ecology · doi:10.1007/s10745-024-00492-7 · Cited by 10 · see citing works
“Yet, we see in multiple cases wildlife with charismatic coloration is not treated as pests but celebrated and often memorialized. certainly has value, biases in these observations could lead to misinterpretations of the data (Dickman, 2010; Carlen et al. 2024).”
Self-citationBiodiversity futures: digital approaches to knowledge and conservation of biological diversity
Freitas, H., & Gouveia, A. C. (2025) · Web Ecology · doi:10.5194/we-25-29-2025 · Cited by 9 · see citing works
Ghermandi, A., Depietri, Y., & Orenstein, D. E. (2026) · Landscape and Urban Planning · doi:10.1016/j.landurbplan.2025.105568 · Cited by 8
Strengths and shortcomings of citizen science data: lessons from Austrian butterflies
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“Volunteer-based data collection from citizen science projects are increasingly promoted as possibility to complement professional biodiversity data (Rüdisser et al. 2017; Krab-benhoft and Kashian 2020; Carlen et al. 2024).”
Impacts of urban heterogeneity in environmental and societal characteristics on coyote survival
Zepeda, E., Sih, A., Schell, C. J., & Gehrt, S. (2024) · Urban Ecosystems · doi:10.1007/s11252-024-01643-w · Cited by 7 · see citing works
“…environmental research and remind us that – even with improving efforts made to equitably engage and coproduce with histor - ically disenfranchised communities – more work is needed to overcome these inequities (Chapman et al. 2024; Carlen et al. 2024; Lambert and Schell 2023; Schell et al. 2020).”
Self-citationDinnage, R., Grady, E. L., Neal, N., Deck, J., Denny, E. G., Walls, R. L., Seltzer, C., Guralnick, R., & Li, D.-J. (2024) · bioRxiv · doi:10.1111/2041-210x.70081 · Cited by 7 · see citing works
“The iNaturalist platform allows users to post an image of any organism found in its environment, along with occurrence metadata and a pre - liminary identification (Di Cecco et al., 2021 ).”
Arazy, O., Kaplan-Mintz, K., Malkinson, D., & Nagar, Y. (2024) · PLoS ONE · doi:10.1371/journal.pone.0308552 · Cited by 7 · see citing works
Herrera, D., Schalk, C. M., Jensen, A., Goldstein, B. R., Rooney, B., Kays, R., McShea, W., & Cove, M. (2025) · Ecology and Evolution · doi:10.1002/ece3.71805 · Cited by 6
“We had expected the abundance of protected areas to increase similarity between datasets since both types of surveys tend to be concentrated in protected areas as opposed to developed spaces (Carlen et al. 2024; Herrera et al. 2021).”
Self-citationA continental-wide decline of occupancy and diversity in five Neotropical carnivores
Grattarola, F., Tschernosterová, K., & Keil, P. (2024) · Global Ecology and Conservation · doi:10.1016/j.gecco.2024.e03226 · Cited by 6 · see citing works
Estien, C. O., Carlen, E. J., & Schell, C. J. (2024) · Ecology and Society · doi:10.5751/es-15263-290316 · Cited by 9 · see citing works
“Recent work has shown that eBird and iNaturalist data can also be influenced by a suite of social factors (Carlen et al. 2024).”
InfluentialSelf-citationClare, J. D. J., Zuckerberg, B., Nunes, L. A., Strange, J. P., Hatfield, R., & Gratton, C. (2025) · Diversity and Distributions: A journal of biological invasions and biodiversity · doi:10.1111/ddi.70034 · Cited by 4 · see citing works
“Because access constrains CS sampling (Carlen et al. 2024), we expected urban and exurban areas with easier public access and throughways to be more heavily sampled than large blocks of private agricultural land.”
Barahona-Segovia, R. M., Chinga, J., Durán-Sanzana, V., Alfaro, E., Murúa, M., & Pañinao-Monsálvez, L. (2025) · Journal of applied entomology · doi:10.1111/jen.13410 · Cited by 4
“…citizen and community science often present biases caused by different filters (spatial, detectability, sampling, preference; Geldmann et al. 2016; Carlen et al. 2024), our work overpasses three of these filters because (1) we used the most populated city in Chile, where a citizen has the…”
DISTRIBUTIONAL PATTERNS OF AMPHIBIANS FROM BUENOS AIRES, ARGENTINA
Ferraro, D., & Bonino, M. (2025) · Revista Latinoamericana de Herpetología · doi:10.22201/fc.25942158e.2025.3.1238 · Cited by 3
“This supports the idea that citizen science data tend to concentrate in more urbanized areas, which may reflect a bias towards more accessible or densely populated regions (Backstrom et al., 2024; Carlen et al., 2024).”
Expanding phenological insights: automated phenostage annotation with community science plant images
Katal, N., Rzanny, M., Mäder, P., Boho, D., Wittich, H., Tautenhahn, S., Bebber, A., & Wäldchen, J. (2025) · International journal of biometeorology · doi:10.1007/s00484-025-02972-x · Cited by 3 · see citing works
“Unlike phenological observers, who systematically monitor specific plants over time (Kaspar et al. 2015 ), plant identification app users document plants for diverse reasons, leading to known biases (Carlen et al. 2024; Geurts et al. 2023; Knape et al. 2022).”
Taraporevala, N. F., Beckmann, J. P., & Young, J. K. (2025) · Wildlife Biology · doi:10.1002/wlb3.01382 · Cited by 3
Oliver, P., Davie-Rieck, A., Ramdani, M., Dashper, J., Kusuma, K. I., Lee, C. C., Rittmeyer, E., Clancy, M., Hamidy, A., Thompson, J. C., et al. (2025) · Pacific Conservation Biology · doi:10.1071/pc24063 · Cited by 3 · see citing works
Owen, H. L., Meng, F., & Winchell, K. (2024) · Biological Journal of the Linnean Society · doi:10.1093/biolinnean/blae099 · Cited by 3
Jingu, S., Ogawa, Y., Yamaki, K., Miyamoto, A., & Takayama, N. (2024) · Sustainability · doi:10.3390/su16135804 · Cited by 3 · see citing works
Grady, E. L., Campbell, C., Callaghan, C., & Guralnick, R. (2026) · Citizen Science: Theory and Practice · doi:10.5334/cstp.868 · Cited by 2
Barantal, S., Morillas, L., Burton, V. J., Sheard, J., Rienks, F., Auclerc, A., Perrin, W., Sandén, T., & Ganault, P. (2026) · Agriculture, Ecosystems & Environment. Applied Soil Ecology · doi:10.1016/j.apsoil.2025.106608 · Cited by 2
Citizen science in pollinator monitoring: current approaches, challenges and recommendations
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Citizen Science Offers Untapped Potential for Conservation Through Research Flexibility
Mandeville, C. (2025) · Conservation Letters · doi:10.1111/con4.70009 · Cited by 2 · see citing works
“Adaptation is a key element in transforming citizen science for equity and justice; as stated succinctly by Carlen et al. (2024), an essential objective is “to create projects that do not use people as tools for science but shift projects to be useful to people.””
InfluentialMcCluney, K., Deviche, P., Sweazea, K., Carlen, E. J., Clark, J. A., Grade, A. M., Haight, J. D., Niesner, C. A., Trego, S., & Weiss, K. C. B. (2025) · Biological Reviews of The Cambridge Philosophical Society · doi:10.1111/brv.70088 · Cited by 2 · see citing works
Self-citationTaddeo, S., Snyder, E., Anderson, E. C., Porter, C. M., Guider, T. M., & Havens, K. (2025) · Urban Ecosystems · doi:10.1007/s11252-025-01794-4 · Cited by 2 · see citing works
“In cities, previous studies showed that community science programs tend to be biased towards wealthier neighborhoods and larger public green spaces (Carlen et al. 2024; Estien et al. 2024), which mirrors our observations in Cook County.”
The wildlife nextdoor: Socioeconomics and race predict social media carnivore reports.
Sherman, W. C., Schell, C. J., & Wilkinson, C. E. (2025) · Science of the Total Environment · doi:10.1016/j.scitotenv.2025.179227 · Cited by 2 · see citing works
Self-citationDefining Community: A Pragmatic Political Ecology Approach
Mikels, J., & Menale, R. (2025) · Environmental and Sustainability Indicators · doi:10.1016/j.indic.2025.100686 · Cited by 2
Martínez-Sagarra, G., Burguera, C., Ferré, A., Illa, E., Mercadé, A., Mora, B., Soriano, I., & Font, X. (2026) · Plant Biosystems · doi:10.1007/s44473-026-00177-7 · Cited by 1
“Such a trend, widely documented in CS datasets, reflects both the accessibility of green spaces and opportunistic observer behaviour (Tiago et al. 2017; Callaghan et al. 2020; Carlen et al. 2024).”
DivShift: Exploring Domain-Specific Distribution Shift in Volunteer-Collected Biodiversity Datasets
Sierra, E., Gillespie, L. E., Soltani, S., Exposito-Alonso, M., & Kattenborn, T. (2024) · arXiv.org · doi:10.48550/arxiv.2410.19816 · Cited by 1
“Despite documenting the effects of five unique partitions, there are yet even more kinds of biases not tested here, and further complex interactions and intersections between these biases should be explored (Carlen et al. 2024; Bowler et al. 2022).”
Schwarzfuchs, E. N., Orenstein, D. E., Ben‐Ami, D., & Dayan, T. (2026) · People and Nature · doi:10.1002/pan3.70452
Costa, E. Z. G., Aguiar, L., Silva, L., Leal, M. F., da Silva, E. L., & Pinheiro, T. G. (2026) · Proceedings. Biological sciences · doi:10.1098/rspb.2026.1072
Fernández, L. D., Zamora-Manzur, C., Treviño-Zevallos, I. F., & Herrera, J. (2026) · Journal of Zoological and Botanical Gardens · doi:10.3390/jzbg7030031
“Citizen-science observations may additionally reflect social and geographic inequalities in where biodiversity records are generated [59].”
Leveraging urban greenspaces to bolster regional conservation priorities
Estien, C. O., Hill, A. P., Robinson, T., Johnson, R. F., Schell, C. J., & Wilkinson, C. E. (2026) · Conservation Science and Practice · doi:10.1111/csp2.70373
“Because there are differences in observation number due to differences in effort and selection of greenspace by samplers (Carlen et al., 2024), we initially aimed to include observations as a log-offset variable along with area to control for differences in sampling effort and greenspace size…”
Self-citationiNaturalist mammal observations classified by evidence type
Alyetama, M., Jensen, A., Jackson, Y., Widness, J., Kays, R., & Goldstein, B. R. (2026) · PLoS ONE · doi:10.1371/journal.pone.0353282
“…of mammals as of January 2026. iNaturalist sampling is unstructured, with no required reporting of sampling process, spatial and temporal allocation of effort [3,4], the taxonomic preferences of individual users [5–7], and logistical factors limiting detectability and species identification [8,9].”
Self-citationEiriksson, E., Snyder, A. M., Rickart, E., Corneli, P., Derieg, K., & Zummo, L. M. (2026) · Citizen Science: Theory and Practice · doi:10.5334/cstp.921
Andries, A., Banks, D., Jamieson, A., Waite, M., Murphy, R., Webster, V., & Morse, S. (2026) · European Journal of Remote Sensing · doi:10.1080/22797254.2026.2691799
Szabolcs, M., Wenner, B., Mizsei, E., & Lengyel, S. (2026) · Citizen Science: Theory and Practice · doi:10.5334/cstp.861
Designing for biodiversity data in place: Species, encounters, and interfaces
Whitelaw, M., Mackenzie, A., Westgate, M., & Morrow, K. (2026) · People and Nature · doi:10.1002/pan3.70384
Eitzel, M., Ulle, N., Meyer, R., & Goldstein, B. R. (2026) · PLoS ONE · doi:10.1371/journal.pone.0352449
“The sampling process that generates these data is heterogeneous, as participants vary in their effort, interests, and skill [20–22], which could bias downstream inference [19,23].”
Self-citationGarcía-Díaz, J. D. J., Pablo‐Cea, J. D., & Espinoza-Sanabria, B. A. (2026) · Journal of Basic and Applied Zoology · doi:10.1186/s41936-026-00582-6
“…of the predicted distribution considering the potential influence of sampling bias associated with citizen science data, particularly the uneven spatial distribution of observers contributing records to platforms such as iNaturalist (Di Cecco et al., 2021; Geurts et al., 2023; Carlen et al., 2024).”
Ketola, T., Kaukokari, V., Mattila, I., Koskenala, S., Kukka‐Maaria, S., Lensu, A., Ruha, L., Nivala, V., & Pusenius, J. (2026) · Wildlife Biology · doi:10.1002/wlb3.01567
Geography of race and income shape spatial data gaps in two national participatory science projects
Perkins, D. J., Mahmoudi, D., Henry, E. H., & Cooper, C. B. (2026) · People and Nature · doi:10.1002/pan3.70307 · Cited by 1 · see citing works
“Residential segregation and skewed demographics in contributory projects alone do not necessarily bias the spatial distribution of wildlife observations (Carlen et al., 2024 ).”
Self-citationA new wildlife monitoring app in Slovenia: A pilot evaluation of data quality and use
Velkavrh, Ž., Duniš, L., Pokorny, B., Potočnik, H., & Bužan, E. (2026) · Journal for Nature Conservation · doi:10.1016/j.jnc.2026.127286
Luna, A., & McFadden, T. (2026) · Biological Conservation · doi:10.1016/j.biocon.2025.111667
Jurado-Angulo, P. (2026) · Boletin de la Asociacion Espanola de Entomologia · doi:10.70186/baeehsle2145
Littauer, R., & Bubendorfer, K. (2025) · arXiv.org · doi:10.48550/arxiv.2512.07907
iNaturalist mammal observations classified by evidence type
Alyetama, M., Jensen, A., Jackson, Y., Widness, J., Kays, R., & Goldstein, B. R. (2025) · bioRxiv · doi:10.1101/2025.09.30.678090
“…as of January 2025 (iNaturalist.org). iNaturalist sampling is unstructured, with no reporting of sampling process, spatial and temporal allocation of effort [3,4], the taxonomic preferences of individual users [5– 7], and logistical factors limiting detectability and species identification [8,9].”
Self-citationGlobal monitoring of wildlife mortality through participatory science in near-real time
Ellis-Soto, D., Taylor, L. U., Edson, E., Hill, A. P., Schell, C. J., Boettiger, C., & Johnson, R. F. (2025) · bioRxiv · doi:10.1101/2025.08.08.669145
“We note there are substantial biases in participatory science datasets, especially in terms of social and economic factors (Ellis-Soto et al. 2023; Carlen et al. 2024; Chapman et al. 2024).”
Self-citationFrom concrete to canopy: Illuminating moth biodiversity in New York City’s urban jungle
Linsk, S., Thonis, A., & Winchell, K. (2025) · bioRxiv · doi:10.1371/journal.pone.0342856
“Research suggests that areas with higher socioeconomic status often experience greater sampling efforts by community scientists [65].”
Combs, M., & Munshi-South, J. (2025) · bioRxiv · doi:10.1101/2025.04.26.650778
Not Empty Rain Gauges: Experienced Hobbyists Fulfilled in a Contributory Project
Naquin, K., Adams, D. R., Bailey, M., Brown, L., Diez, M., McCune, R., Thelen, T., Hunter, D. L., Cooper, C., & Kanipe, J. (2025) · Citizen Science: Theory and Practice · doi:10.5334/cstp.774
Self-citationHeard, M. J., Putman, B. J., Riskin, S., & Thawley, C. J. (2025) · The American history teacher · doi:10.1525/abt.2025.87.4-5.286
“Working on developing authentic research questions could also facilitate discussion of the limitations and biases inherent in these large, publicly created databases, such as incorrect identifications, and biases in where and when observations are made (e.g., Carlen et al., 2024).”
Bias in Open Biodiversity Data: Methodological Implications for Conservation Decision-Making
Đukić, J., & Cvetkovic, D. (2026) · SINTEZA · doi:10.15308/sinteza-2026-570-576
“Still, the way these data are collected often reflects site accessibility, participant movement, and interest in certain species more than actual ecological conditions on-the-ground [6]–[8].”
- Authors
- Carlen, E. J., Estien, C. O., Caspi, T., Perkins, D., Goldstein, B. R., Kreling, S. E. S., Hentati, Y., Williams, T. D., Stanton, L. A., Des Roches, S., Johnson, R. F., Young, A. N., Cooper, C. B., & Schell, C. J.
- Affiliations
- Washington University in St. Louis (US)
- University of California, Berkeley (US)
- University of California, Davis (US)
- North Carolina State University (US)
- University of Washington (US)
- School of Aquatic and Fishery Sciences University of Washington Seattle Washington USA
- California Academy of Sciences (US)
- Corresponding author
- Carlen, Elizabeth J.
- Estien, Cesar O.
- ORCID
- Venue
- People and Nature
- Publisher
- Wiley
- Published
- 2024-03-03
- Volume
- 6
- Issue
- 2
- Pages
- 377-390
- ISSN
- 2575-8314 (ISSN-L)
- OpenAlex
- W4392372060
- Cited by
- 57
- References
- 113
- Citations by year
- 2026: 21 · 2025: 26 · 2024: 9 · 2023: 1
- FWCI
- 52.86
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- People and Nature (publishedVersion, cc-by-nc)
- eScholarship (California Digital Library) (submittedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- National Science Foundation (DBI‐2109587, DGE‐1752814, DGE‐2146752, DGE‐2140004, DRL‐1713562)
- University of California
- Topics
- Physical Sciences › Environmental Science › Ecological Modeling › Species Distribution and Climate Change
- Physical Sciences › Computer Science › Information Systems › Research Data Management Practices
- Social Sciences › Geography, Planning and Development › Geographic Information Systems Studies
- Keywords
- citizen science, data bias, biodiversity data, eBird, iNaturalist, participation bias, sampling bias, preference bias, biodiversity conservation, equity in conservation, inclusive science
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