Papers by Gretchen Lebuhn
Ecology Letters, Apr 1, 2007
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Ecology and Evolution, Dec 1, 2014
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Nature Sustainability, 2019
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Current opinion in insect science, Aug 1, 2021
Pollinators and the environments where they live are experiencing increasing human impacts leadin... more Pollinators and the environments where they live are experiencing increasing human impacts leading to changes, primarily declines, in species richness and population abundances. The drivers of pollinator decline vary. Almost every type human resource use leads to some level of loss of habitat. The effects of pollution, particularly heavy metals, pesticides and the role of disease are increasingly recognized as important drivers of pollinator declines, however, significant gaps in our knowledge exist. Of particular concern is the feedback loop between decreasing pollination service, plant inbreeding, declines in nectar quality and further pollinator decline. When viewed in the context of the abiotic and biotic shifts associated with climate change, we suggest that focusing on ensuring there is adequate habitat remaining to provide resilience should be a central strategy for preserving pollinators.
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A dataset of 3,250,404 measurements, collated from 26,114 sampling locations in 94 countries and ... more A dataset of 3,250,404 measurements, collated from 26,114 sampling locations in 94 countries and representing 47,044 species. The data were collated from 480 existing spatial comparisons of local-scale biodiversity exposed to different intensities and types of anthropogenic pressures, from terrestrial sites around the world. The database was assembled as part of the PREDICTS project - Projecting Responses of Ecological Diversity In Changing Terrestrial Systems; [www.predicts.org.uk](http://www.predicts.org.uk).\r\n\r\nThe taxonomic identifications provided in the original data sets are those determined at the time of the original research, and so will not reflect subsequent taxonomic changes.\r\n\r\nThis dataset is described in [10.1002/ece3.2579](http://dx.doi.org/10.1002/ece3.2579). A description of the way that this dataset was assembled is given in [10.1002/ece3.1303](http://dx.doi.org/10.1002/ece3.1303).\r\n\r\n* `columns.csv`: Description of data extract columns\r\n* `database...
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Science, Aug 7, 1998
The Ecological Detective Confronting Models with Data. Ray Hilborn and Marc Mangel. Princeton Uni... more The Ecological Detective Confronting Models with Data. Ray Hilborn and Marc Mangel. Princeton University Press, Princeton, NJ, 1997. 334 pp., $39.50, £30. ISBN 0-691-03496-6. Paper, $19.95, £16.95. ISBN 0-691-03497-4. How do we find congruence among field, laboratory, and model? Hilborn and Mangel present an approach to investigating the complex (ecology, in this case) by trying different hypotheses until a coherent picture emerges. The authors make extensive use of computer programming for the generation of hypotheses, exploration of data, and comparison of different models.
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American Biology Teacher, 2017
The value of long-term data (generally >10 years) in ecology is well known. Funding agenci... more The value of long-term data (generally >10 years) in ecology is well known. Funding agencies clearly see the value in these data and have supported a limited number of projects to this end. However, individual researchers often see the challenges of long-term data collection as insurmountable. We propose that long-term data collection can be practical as part of any teaching or outreach program, and we provide guidance on how long-term projects can fit into a teaching and research schedule. While our primary audience is college faculty, our message is appropriate for anyone interested in establishing long-term studies. The benefits of adopting these kinds of projects include experience for students, encouraging public interest in science, increased publication potential for researchers, and increased large-scale data availability, leading to a better understanding of ecological phenomena.
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This dataset contains site-level summaries of more than 1.6 million samples from 78 countries rep... more This dataset contains site-level summaries of more than 1.6 million samples from 78 countries representing over 28,000 species, collated from existing spatial comparisons of local-scale biodiversity exposed to different intensities and types of anthropogenic pressures, from terrestrial sites around the world. The underlying database is being assembled as part of the [PREDICTS project](http://www.predicts.org.uk) - Projecting Responses of Ecological Diversity In Changing Terrestrial Systems. A complete description of the data is given in [http://dx.doi.org/10.1002/ece3.1303](http://dx.doi.org/10.1002/ece3.1303).
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Oryx, 2020
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Oikos, 2020
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Ecology and evolution, 2017
The PREDICTS project-Projecting Responses of Ecological Diversity In Changing Terrestrial Systems... more The PREDICTS project-Projecting Responses of Ecological Diversity In Changing Terrestrial Systems (www.predicts.org.uk)-has collated from published studies a large, reasonably representative database of comparable samples of biodiversity from multiple sites that differ in the nature or intensity of human impacts relating to land use. We have used this evidence base to develop global and regional statistical models of how local biodiversity responds to these measures. We describe and make freely available this 2016 release of the database, containing more than 3.2 million records sampled at over 26,000 locations and representing over 47,000 species. We outline how the database can help in answering a range of questions in ecology and conservation biology. To our knowledge, this is the largest and most geographically and taxonomically representative database of spatial comparisons of biodiversity that has been collated to date; it will be useful to researchers and international effort...
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Conservation Biology, 2014
Gretchen Lebuhn,∗ ¶ Sam Droege,† Edward F. Connor,∗ Barbara Gemmill-Herren,‡ Simon G. Potts,§ Rob... more Gretchen Lebuhn,∗ ¶ Sam Droege,† Edward F. Connor,∗ Barbara Gemmill-Herren,‡ Simon G. Potts,§ Robert L. Minckley,∗∗ Robert P. Jean,†† Emanuel Kula,‡‡ David W. Roubik,§§ Karen W. Wright,∗∗∗ Gordon Frankie,††† and Frank Parker‡‡‡ ∗Department of Biology, San Francisco State University, San Francisco, CA 94132, U.S.A. †USGS Patuxent Wildlife Research Center, 12100 Beech Forest Road, Laurel, MD 20708-4039, U.S.A. ‡Food and Agriculture Organization of the United Nations, viale delle Terme di Caracalla, Rome 00100, Italy §Centre for Agri-Environmental Research (CAER), School of Agriculture, Policy and Development, University of Reading, RG6 6AR, United Kingdom ∗∗Department of Biology, University of Rochester, Rochester, NY 14627, U.S.A. ††Department of Sciences and Mathematics, Saint Mary-of-the-Woods College, St. Mary of the Woods, IN 47876, U.S.A. ‡‡Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry, Zemědělska 3 CZ-61300 Brno 420 545 134 127, Czech Republic §§Smithsonian Tropical Research Institute, Box 0843–03092 Balboa Ancon, Republic of Panama ∗∗∗Sevilleta LTER, Department of Biology 167 Castetter Hall, MSC03 20201, University of New Mexico, Albuquerque, NM 87131-0001, U.S.A. †††Dept of Environmental Science, Policy, & Management, University of California, Berkeley, CA 94720, U.S.A. ‡‡‡USDA-ARS Bee Biology and Systematics Lab, Utah State University, Logan, UT 84322, U.S.A.
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Global patterns of the contribution of biocultural approaches to pollinators and pollination to q... more Global patterns of the contribution of biocultural approaches to pollinators and pollination to quality of life, from studies/sites identified in an analysis. These data were collected as part of, and in addition to, a contribution to the Intergovernmental Platform on Biodiversity and Ecosystem Services assessment of Pollinators and Pollination in Food Production. The data show locations of sites where Indigenous and Local Knowledge (ILK) contributes to: (a) beekeeping; (b) honey hunting; (c) Intangible Cultural Heritage listed as globally significant; (d) Cultural and mixed (cultural/natural) sites inscribed on the World Heritage List (WHL) with significance to pollinators. Also includes studies/sites identified where ILK contributions to practices that protect pollinators: Actions to foster pollinator nesting resources; mental maps of pollinators/resources; totems; taboos; manipulation of resources in the landscape; use of biotemporal indicators; and fire to stimulate pollination ...
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The popularity of social media websites like Flickr and Twitter has created enormous collections ... more The popularity of social media websites like Flickr and Twitter has created enormous collections of user-generated content online. La-tent in these content collections are observations of the world: each photo is a visual snapshot of what the world looked like at a par-ticular point in time and space, for example, while each tweet is a textual expression of the state of a person and his or her envi-ronment. Aggregating these observations across millions of social sharing users could lead to new techniques for large-scale moni-toring of the state of the world and how it is changing over time. In this paper we step towards that goal, showing that by analyzing the tags and image features of geo-tagged, time-stamped photos we can measure and quantify the occurrence of ecological phenomena including ground snow cover, snow fall and vegetation density. We compare several techniques for dealing with the large degree of noise in the dataset, and show how machine learning can be used to redu...
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As rapid urbanization continues, existing natural areas within urban zones will play a critical r... more As rapid urbanization continues, existing natural areas within urban zones will play a critical role in safeguarding remaining biodiversity. Ants are an integral part of almost every terrestrial ecosystem, including urban environments, and understanding which environmental characteristics influence their persistence is critical. In this study, 24 protected natural areas within urban parks including mosaic, scrub, herbaceous and forest habitats were surveyed for ants with 563 pitfall traps. The data provide insights into the distribution and abundance of ant fauna in San Francisco natural areas, as well as which characteristics of parks have the most influence on ant community composition. A total of 2,068 ant individuals representing 15 species were collected. A regression analysis revealed that urban forests reduced ant richness and abundance and that there was little or no impact of the Argentine ant on native ants. Natural area size and shape were not important in explaining vari...
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Ecology
Invasive species can reach high abundances and dominate native environments. One of the most impr... more Invasive species can reach high abundances and dominate native environments. One of the most impressive examples of ecological invasions is the spread of the African sub-species of the honey bee throughout the Americas, starting from its introduction in a single locality in Brazil. The invasive honey bee is expected to more negatively impact bee community abundance and diversity than native dominant species, but this has not been tested previously. We developed a comprehensive and systematic bee sampling scheme, using a protocol deploying 11,520 pan traps across regions and crops for three years in Brazil. We found that invasive honey bees are now the single most dominant bee species. Such dominance has not only negative consequences for abundance and species richness of native bees but also for overall bee abundance (i.e., strong "numerical" effects of honey bees). Contrary to expectations, honey bees did not have stronger negative impacts than other native bees achieving similar levels of dominance (i.e., lack of negative "identity" effects of honey bees). These effects were remarkably consistent across crop species, seasons and years, and were independent from land-use effects. Dominance could be a proxy of bee community degradation and more generally of the severity of ecological invasions.
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Papers by Gretchen Lebuhn