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Articles by Donald Waller
When wolves aren't enough: revisiting trophic cascades in northern Wisconsin
Introduction Widespread loss of large carnivores can lead to trophic downgrading with transformative negative impacts on terrestrial and aquatic ecosystems (Estes et al. 2011, Ripple et al. 2014).
Contrasting thermophilization among forests, grasslands and alpine summits
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Abstract Climate warming is shifting biological communities, with warmth-demanding species being favoured at the expense of cold-adapted species in a process referred to as thermophilization1,2,3,4. Because biodiversity responses often lag behind climate warming, climatic debts are accumulating in many ecosystems across the world5,6,7. Although we might expect that thermophilization and climatic debts will vary among habitats, standardized quantification across ecosystems is lacking.
By Kai Yue, Pieter Vangansbeke, Isla Myers-Smith, Donald Waller, Kris Verheyen, Markus Bernhardt-Römermann, Lander Baeten, Ingmar R. Staude, Anne D. Bjorkman, Radim Hédl, Christopher Andrews, Thomas Becker, Jonathan Bennie, Volker Blüml, Jörg Brunet, James Bullock, Hans Van Calster, Michele Carbognani, Markéta Chudomelová, Pavel Dan Turtureanu, Gergana N. Daskalova, Guillaume Decocq, Jan Dick, Martin R. Diekmann, Thomas Dirnböck, Ove Eriksson, Bente Jessen Graae, Thilo Heinken, Ute Jandt, Bogdan Jaroszewicz, Jozef Kollár, Martin Kopecký, Andrea Lamprecht, Jonathan Lenoir, Martin Macek, Marek Malicki, František Máliš, Ottar Michelsen, Fraser JG Mitchell, Tobias Naaf, Thomas Nagel, Adrian Newton, Anna Orczewska, Simone Orsenigo, Jan den Ouden, Harald Pauli, George Peterken, Petr Petřík, Remigiusz Pielech, Christophe Randin, Kamila Reczyńska, Christian Rixen, Wolfgang Schmidt, Tibor Standovár, Krzysztof Świerkosz, Balazs Teleki, Jean-Paul Theurillat, Thomas Vanneste, Mark Vellend, Philippine Vergeer, Ondřej Vild, Luis Villar, Pascal Vittoz, Manuela Winkler, Sonja Wipf, Fuzhong Wu, Shengmin Zhang, Pieter De Frenne, Elena Barni, Antoine Becker-Scarpitta, José-Luis Benito-Alonso, Imre Berki, Déborah Closset-Kopp, Tomasz Durak, Brigitta Erschbamer, Martin Hermy, Peter Horchler, Róbert Kanka, Thomas Kudernatsch, Miles Newman, Lena Nicklas, Ludovica Oddi, Adrienne Ortmann-Ajkai, Mihai Puşcaş, Fride Høistad Schei, Alina Stachurska-Swakon, Tudor-Mihai Ursu
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Nature
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Twig age 2.0: A novel and reliable method to track variation in ungulate browsing over species, sites and time
“A common error is to try to appraise [deer numbers] by census, rather than by browse conditions. The public can dispute endlessly about censuses, but it cannot dispute dead browse plants.” Aldo Leopold, 1947 1 INTRODUCTION Leopold recognized in the 1930s and 40s that high ungulate densities could impair plant cover, diversity, soil stability and other habitat values.
The role of pseudo-overdominance in maintaining inbreeding depression
Abstract Classical models ignoring linkage predict that deleterious recessive mutations purge or fix within inbred populations, yet these often retain moderate to high segregating load. True overdominance generates balancing selection that sustains inbreeding depression even in inbred populations but is rare. In contrast, arrays of mildly deleterious recessives linked in repulsion may occur commonly enough to generate pseudo-overdominance and sustain segregating load.
Wisconsin’s wolf hunt shows hunters have too much sway over conservation policy - The Washington Post
Jodi Habush Sinykin is an environmental attorney specializing in wildlife and water issues. Donald Waller is an ecologist and conservation biologist recently retired from the University of Wisconsin at Madison. Wisconsin’s brutal wolf hunt in late February generated outrage — and for good reason. In less than three days, hunters and trappers 216 wolves, 20 percent of the and far above their state-imposed quota of 119.
Homogenization of species composition and species association networks are decoupled
Homogenization of species composition and species association networks are decoupled Daijiang Li, Timothee Poisot, Donald Waller, Benjamin Baiser bioRxiv 265264; doi: https://doi.org/10.1101/265264
Correction: Long-Term Regional Shifts in Plant Community Composition Are Largely Explained by Local Deer Impact Experiments
Upon review of the dataset used in this manuscript, the authors discovered that the abundance data used in two analyses were inadvertently scrambled, resulting in inflated abundance values. The erroneous numbers affect two of the analyses in the paper, however the initial findings still hold. The affected content is corrected below.
Azoospermia in rabbits following an intravas injection of Vasalgel ™
Despite the need for male contraception and the fact that vas-occlusive devices have been tested for decades, no product has been successfully introduced to the market. The characteristics of the occlusive material are critical and previous attempts to use solid or semi-solid material had side effects or unacceptable efficacy. For example, a urethane intra-vas device tested in 288 men in China proved to be only 94.3 % effective, not matching vasectomy’s 98.6 % effectiveness in the study [12].
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