Mammal Responses to Global Changes in Human Activity Vary by Trophic Group and Landscape

Wildlife must adapt to human presence to survive in the Anthropocene, so it is critical to understand species responses to humans in different contexts. We used camera trapping as a lens to view mammal responses to changes in human activity during the COVID-19 pandemic. Across 163 species sampled in 102 projects around the world, changes in the amount and timing of animal activity varied widely. Under higher human activity, mammals were less active in undeveloped areas but unexpectedly more active in developed areas while exhibiting greater nocturnality. Carnivores were most sensitive, showing the strongest decreases in activity and greatest increases in nocturnality. Wildlife managers must consider how habituation and uneven sensitivity across species may cause fundamental differences in human-wildlife interactions along gradients of human influence.

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References

Venter O, Sanderson E, Magrach A, Allan J, Beher J, Jones K . Sixteen years of change in the global terrestrial human footprint and implications for biodiversity conservation. Nat Commun. 2016; 7:12558. PMC: 4996975. DOI: 10.1038/ncomms12558. View

Suraci J, Clinchy M, Zanette L, Wilmers C . Fear of humans as apex predators has landscape-scale impacts from mountain lions to mice. Ecol Lett. 2019; 22(10):1578-1586. DOI: 10.1111/ele.13344. View

Berger J . Fear, human shields and the redistribution of prey and predators in protected areas. Biol Lett. 2007; 3(6):620-3. PMC: 2391231. DOI: 10.1098/rsbl.2007.0415. View

McShea W . Ecology and management of white-tailed deer in a changing world. Ann N Y Acad Sci. 2012; 1249:45-56. DOI: 10.1111/j.1749-6632.2011.06376.x. View

Pacifici M, Rondinini C, Rhodes J, Burbidge A, Cristiano A, Watson J . Global correlates of range contractions and expansions in terrestrial mammals. Nat Commun. 2020; 11(1):2840. PMC: 7275054. DOI: 10.1038/s41467-020-16684-w. View

Ripple W, Estes J, Beschta R, Wilmers C, Ritchie E, Hebblewhite M . Status and ecological effects of the world's largest carnivores. Science. 2014; 343(6167):1241484. DOI: 10.1126/science.1241484. View

Bates A, Primack R, Moraga P, Duarte C . COVID-19 pandemic and associated lockdown as a "Global Human Confinement Experiment" to investigate biodiversity conservation. Biol Conserv. 2020; 248:108665. PMC: 7284281. DOI: 10.1016/j.biocon.2020.108665. View

Rutz C, Loretto M, Bates A, Davidson S, Duarte C, Jetz W . COVID-19 lockdown allows researchers to quantify the effects of human activity on wildlife. Nat Ecol Evol. 2020; 4(9):1156-1159. DOI: 10.1038/s41559-020-1237-z. View

Basile M, Russo L, Russo V, Senese A, Bernardo N . Birds seen and not seen during the COVID-19 pandemic: The impact of lockdown measures on citizen science bird observations. Biol Conserv. 2021; 256:109079. PMC: 8457629. DOI: 10.1016/j.biocon.2021.109079. View

10.

Bates A, Primack R, Biggar B, Bird T, Clinton M, Command R . Global COVID-19 lockdown highlights humans as both threats and custodians of the environment. Biol Conserv. 2021; 263:109175. PMC: 8135229. DOI: 10.1016/j.biocon.2021.109175. View

11.

Hale T, Angrist N, Goldszmidt R, Kira B, Petherick A, Phillips T . A global panel database of pandemic policies (Oxford COVID-19 Government Response Tracker). Nat Hum Behav. 2021; 5(4):529-538. DOI: 10.1038/s41562-021-01079-8. View

11.

Ripple W, Abernethy K, Betts M, Chapron G, Dirzo R, Galetti M . Bushmeat hunting and extinction risk to the world's mammals. R Soc Open Sci. 2016; 3(10):160498. PMC: 5098989. DOI: 10.1098/rsos.160498. View

12.

Procko M, Naidoo R, LeMay V, Burton A . Human impacts on mammals in and around a protected area before, during, and after COVID-19 lockdowns. Conserv Sci Pract. 2022; 4(7):e12743. PMC: 9347595. DOI: 10.1111/csp2.12743. View

13.

Betts M, Wolf C, Pfeifer M, Banks-Leite C, Arroyo-Rodriguez V, Ribeiro D . Extinction filters mediate the global effects of habitat fragmentation on animals. Science. 2019; 366(6470):1236-1239. DOI: 10.1126/science.aax9387. View

14.

Lowry H, Lill A, Wong B . Behavioural responses of wildlife to urban environments. Biol Rev Camb Philos Soc. 2013; 88(3):537-49. DOI: 10.1111/brv.12012. View

15.

Gaynor K, Brown J, Middleton A, Power M, Brashares J . Landscapes of Fear: Spatial Patterns of Risk Perception and Response. Trends Ecol Evol. 2019; 34(4):355-368. DOI: 10.1016/j.tree.2019.01.004. View

16.

Kennedy C, Oakleaf J, Theobald D, Baruch-Mordo S, Kiesecker J . Managing the middle: A shift in conservation priorities based on the global human modification gradient. Glob Chang Biol. 2019; 25(3):811-826. DOI: 10.1111/gcb.14549. View

16.

Gonzalez-Lagos C, Sol D, Reader S . Large-brained mammals live longer. J Evol Biol. 2010; 23(5):1064-74. DOI: 10.1111/j.1420-9101.2010.01976.x. View

17.

Gaynor K, Hojnowski C, Carter N, Brashares J . The influence of human disturbance on wildlife nocturnality. Science. 2018; 360(6394):1232-1235. DOI: 10.1126/science.aar7121. View

17.

Purvis A, Gittleman J, Cowlishaw G, Mace G . Predicting extinction risk in declining species. Proc Biol Sci. 2000; 267(1456):1947-52. PMC: 1690772. DOI: 10.1098/rspb.2000.1234. View