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Marion S, Curveira Santos G, Herdman E, Hubbs A, Kearney SP, Burton AC. Mammal responses to human recreation depend on landscape context. PLoS One 2024; 19:e0300870. [PMID: 39024232 PMCID: PMC11257333 DOI: 10.1371/journal.pone.0300870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 03/06/2024] [Indexed: 07/20/2024] Open
Abstract
Rapid growth in outdoor recreation may have important and varied effects on terrestrial mammal communities. Few studies have investigated factors influencing variation in observed responses of multiple mammal species to recreation. We used data from 155 camera traps, in western Alberta (Canada), and a hierarchical Bayesian community modelling framework to document 15 mammal species responses to recreation, test for differential responses between predators and prey, and evaluate the influence of local context. Factors characterizing context were trail designation (i.e., use by motorized vs non-motorized), management type, forest cover, landscape disturbance, and season. We used three measures to characterize variation in recreation pressure: distance to trail, trail density, and an index of recreation intensity derived from the platform Strava. We found limited evidence for strong or consistent effects of recreation on mammal space use. However, mammal space use was better explained by an interaction between recreation and the influencing factors than by either on their own. The strongest interaction was between trail density and management type; mammals were more likely to avoid sites near a higher density of trails in areas with more restrictive management. We found that responses to recreation varied with the trail designation, although there were not clear or consistent differences between responses to trails designated for motorized vs. non-motorized use. Overall, we found that responses were species- and context-dependent. Limiting the density of trails may be important for reducing negative impacts to mammals within conservation areas. We show that using multiple measures of recreation yields more insight into the varied effects of human disturbances on wildlife. We recommend investigating how different characteristics of recreation (noise, speed, and visibility) influence animal behaviors. Multispecies monitoring and modelling across multiple landscapes that vary in recreation pressure can lead to an adaptive management approach to ensuring outdoor recreation coexistence with wildlife.
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Affiliation(s)
- Solène Marion
- Department of Forest Resources Management, University of British Columbia, Vancouver, British Columbia, Canada
- JNCC, Inverdee House, Aberdeen, United Kingdom
| | - Gonçalo Curveira Santos
- Department of Forest Resources Management, University of British Columbia, Vancouver, British Columbia, Canada
- CIBIO—Research Center in Biodiversity and Genetic Resources, InBIO Associated Laboratory, Universidade do Porto, Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Vairão, Portugal
| | | | - Anne Hubbs
- Resource Stewardship, Environment and Protected Areas, Alberta, Canada
| | - Sean Patrick Kearney
- Department of Forest Resources Management, University of British Columbia, Vancouver, British Columbia, Canada
| | - A. Cole Burton
- Department of Forest Resources Management, University of British Columbia, Vancouver, British Columbia, Canada
- Biodiversity Research Centre, University of British Columbia, Vancouver, British Columbia, Canada
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2
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Barnas AF, Ladle A, Burgar JM, Burton AC, Boyce MS, Eliuk L, Grey F, Heim N, Paczkowski J, Stewart FEC, Tattersall E, Fisher JT. How landscape traits affect boreal mammal responses to anthropogenic disturbance. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 915:169285. [PMID: 38103612 DOI: 10.1016/j.scitotenv.2023.169285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 12/04/2023] [Accepted: 12/09/2023] [Indexed: 12/19/2023]
Abstract
Understanding mammalian responses to anthropogenic disturbance is challenging, as ecological processes and the patterns arising therefrom notoriously change across spatial and temporal scales, and among different landscape contexts. Responses to local scale disturbances are likely influenced by landscape context (e.g., overall landscape-level disturbance, landscape-level productivity). Hierarchical approaches considering small-scale sampling sites as nested holons within larger-scale landscapes, which constrain processes in lower-level holons, can potentially explain differences in ecological processes between multiple locations. We tested hypotheses about mammal responses to disturbance and interactions among holons using collected images from 957 camera sites across 9 landscapes in Alberta from 2007 to 2020 and examined occurrence for 11 mammal species using generalized linear mixed models. White-tailed deer occurred more in higher disturbed sites within lower disturbed landscapes (β = -0.30 [-0.4 to -0.15]), whereas occurrence was greater in highly disturbed sites within highly disturbed landscapes for moose (β = 0.20 [0.09-0.31]), coyote (β = 0.20 [0.08-0.26]), and lynx (β = 0.20 [0.07-0.26]). High disturbance sites in high productivity landscapes had higher occurrence of black bears (β = -0.20 [-0.46 to -0.01]), lynx (β = -0.70 [-0.97 to -0.34]), and wolves (β = -0.50 [-0.73 to -0.21]). Conversely, we found higher probability of occurrence in low productivity landscapes with increasing site disturbance for mule deer (β = 0.80 [0.39-1.14]), and white-tailed deer (β = 0.20 [0.01-0.47]). We found the ecological context created by aggregate sums (high overall landscape disturbance), and by subcontinental hydrogeological processes in which that landscape is embedded (high landscape productivity), alter mammalian responses to anthropogenic disturbance at local scales. These responses also vary by species, which has implications for large-scale conservation planning. Management interventions must consider large-scale geoclimatic processes and geographic location of a landscape when assessing wildlife responses to disturbance.
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Affiliation(s)
- Andrew F Barnas
- School of Environmental Studies, University of Victoria, Victoria, Canada.
| | - Andrew Ladle
- School of Environmental Studies, University of Victoria, Victoria, Canada; Department of Biological Sciences, University of Alberta, Edmonton, Canada
| | - Joanna M Burgar
- School of Environmental Studies, University of Victoria, Victoria, Canada; Department of Forest Resources Management, University of British Columbia, Vancouver, Canada
| | - A Cole Burton
- Department of Forest Resources Management, University of British Columbia, Vancouver, Canada; Biodiversity Research Centre, University of British Columbia, Vancouver, Canada
| | - Mark S Boyce
- Department of Biological Sciences, University of Alberta, Edmonton, Canada
| | - Laura Eliuk
- School of Environmental Studies, University of Victoria, Victoria, Canada
| | - Fabian Grey
- Whitefish Lake First Nation #459, Atikameg, Alberta, Canada
| | - Nicole Heim
- School of Environmental Studies, University of Victoria, Victoria, Canada
| | - John Paczkowski
- Government of Alberta, Forests, Parks, and Tourism, Canmore, Alberta, Canada
| | - Frances E C Stewart
- School of Environmental Studies, University of Victoria, Victoria, Canada; Department of Biology, Wilfrid Laurier University, Waterloo, Ontario (Haldimand Tract), Canada
| | - Erin Tattersall
- Department of Forest Resources Management, University of British Columbia, Vancouver, Canada
| | - Jason T Fisher
- School of Environmental Studies, University of Victoria, Victoria, Canada
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3
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Fennell MJE, Ford AT, Martin TG, Burton AC. Assessing the impacts of recreation on the spatial and temporal activity of mammals in an isolated alpine protected area. Ecol Evol 2023; 13:e10733. [PMID: 38034339 PMCID: PMC10682857 DOI: 10.1002/ece3.10733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 10/29/2023] [Accepted: 10/31/2023] [Indexed: 12/02/2023] Open
Abstract
The management objectives of many protected areas must meet the dual mandates of protecting biodiversity while providing recreational opportunities. It is difficult to balance these mandates because it takes considerable effort to monitor both the status of biodiversity and impacts of recreation. Using detections from 45 camera traps deployed between July 2019 and September 2021, we assessed the potential impacts of recreation on spatial and temporal activity for 8 medium- and large-bodied terrestrial mammals in an isolated alpine protected area: Cathedral Provincial Park, British Columbia, Canada. We hypothesised that some wildlife perceive a level of threat from people, such that they avoid 'risky times' or 'risky places' associated with human activity. Other species may benefit from associating with people, be it through access to anthropogenic resource subsidies or filtering of competitors/predators that are more human-averse (i.e., human shield hypothesis). Specifically, we predicted that large carnivores would show the greatest segregation from people while mesocarnivores and ungulates would associate spatially with people. We found spatial co-occurrence between ungulates and recreation, consistent with the human shield hypothesis, but did not see the predicted negative relationship between larger carnivores and humans, except for coyotes (Canis latrans). Temporally, all species other than cougars (Puma concolor) had diel activity patterns significantly different from that of recreationists, suggesting potential displacement in the temporal niche. Wolves (Canis lupus) and mountain goats (Oreamnos americanus) showed shifts in temporal activity away from people on recreation trails relative to off-trail areas, providing further evidence of potential displacement. Our results highlight the importance of monitoring spatial and temporal interactions between recreation activities and wildlife communities, in order to ensure the effectiveness of protected areas in an era of increasing human impacts.
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Affiliation(s)
| | - Adam T. Ford
- Irving K Barber Faculty of ScienceUniversity of British Columbia OkanaganKelownaBritish ColumbiaCanada
- Biodiversity Research CentreUniversity of British ColumbiaVancouverBritish ColumbiaCanada
| | - Tara G. Martin
- Faculty of ForestryUniversity of British ColumbiaVancouverBritish ColumbiaCanada
- Biodiversity Research CentreUniversity of British ColumbiaVancouverBritish ColumbiaCanada
| | - A. Cole Burton
- Faculty of ForestryUniversity of British ColumbiaVancouverBritish ColumbiaCanada
- Biodiversity Research CentreUniversity of British ColumbiaVancouverBritish ColumbiaCanada
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4
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Martijn B, Jim C, Natalie B, Thomas N. Simulation-based assessment of the performance of hierarchical abundance estimators for camera trap surveys of unmarked species. Sci Rep 2023; 13:16169. [PMID: 37758779 PMCID: PMC10533874 DOI: 10.1038/s41598-023-43184-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 09/20/2023] [Indexed: 09/29/2023] Open
Abstract
Knowledge on animal abundances is essential in ecology, but is complicated by low detectability of many species. This has led to a widespread use of hierarchical models (HMs) for species abundance, which are also commonly applied in the context of nature areas studied by camera traps (CTs). However, the best choice among these models is unclear, particularly based on how they perform in the face of complicating features of realistic populations, including: movements relative to sites, multiple detections of unmarked individuals within a single survey, and low detectability. We conducted a simulation-based comparison of three HMs (Royle-Nichols, binomial N-mixture and Poisson N-mixture model) by generating groups of unmarked individuals moving according to a bivariate Ornstein-Uhlenbeck process, monitored by CTs. Under a range of simulated scenarios, none of the HMs consistently yielded accurate abundances. Yet, the Poisson N-mixture model performed well when animals did move across sites, despite accidental double counting of individuals. Absolute abundances were better captured by Royle-Nichols and Poisson N-mixture models, while a binomial N-mixture model better estimated the actual number of individuals that used a site. The best performance of all HMs was observed when estimating relative trends in abundance, which were captured with similar accuracy across these models.
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Affiliation(s)
- Bollen Martijn
- Centre for Environmental Sciences, UHasselt, Diepenbeek, Belgium.
- Research Institute Nature and Forest, Brussels, Belgium.
- Data Science Institute, UHasselt, Diepenbeek, Belgium.
| | - Casaer Jim
- Research Institute Nature and Forest, Brussels, Belgium
| | | | - Neyens Thomas
- Data Science Institute, UHasselt, Diepenbeek, Belgium
- Leuven Biostatistics and Statistical Bioinformatics Centre, KU Leuven, Leuven, Belgium
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Semper-Pascual A, Sheil D, Beaudrot L, Dupont P, Dey S, Ahumada J, Akampurira E, Bitariho R, Espinosa S, Jansen PA, Lima MGM, Martin EH, Mugerwa B, Rovero F, Santos F, Uzabaho E, Bischof R. Occurrence dynamics of mammals in protected tropical forests respond to human presence and activities. Nat Ecol Evol 2023; 7:1092-1103. [PMID: 37365343 DOI: 10.1038/s41559-023-02060-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 04/02/2023] [Indexed: 06/28/2023]
Abstract
Protected areas (PAs) play a vital role in wildlife conservation. Nonetheless there is concern and uncertainty regarding how and at what spatial scales anthropogenic stressors influence the occurrence dynamics of wildlife populations inside PAs. Here we assessed how anthropogenic stressors influence occurrence dynamics of 159 mammal species in 16 tropical PAs from three biogeographic regions. We quantified these relationships for species groups (habitat specialists and generalists) and individual species. We used long-term camera-trap data (1,002 sites) and fitted Bayesian dynamic multispecies occupancy models to estimate local colonization (the probability that a previously empty site is colonized) and local survival (the probability that an occupied site remains occupied). Multiple covariates at both the local scale and landscape scale influenced mammal occurrence dynamics, although responses differed among species groups. Colonization by specialists increased with local-scale forest cover when landscape-scale fragmentation was low. Survival probability of generalists was higher near the edge than in the core of the PA when landscape-scale human population density was low but the opposite occurred when population density was high. We conclude that mammal occurrence dynamics are impacted by anthropogenic stressors acting at multiple scales including outside the PA itself.
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Affiliation(s)
- Asunción Semper-Pascual
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway.
| | - Douglas Sheil
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway
- Forest Ecology and Forest Management Group, Wageningen University and Research, Wageningen, the Netherlands
- Center for International Forestry Research, Bogor, Indonesia
| | - Lydia Beaudrot
- Program in Ecology & Evolutionary Biology, Department of BioSciences, Rice University, Houston, TX, USA
| | - Pierre Dupont
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway
| | - Soumen Dey
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway
| | - Jorge Ahumada
- Moore Center for Science, Conservation International, Arlington, VA, USA
| | - Emmanuel Akampurira
- Institute of Tropical Forest Conservation, Mbarara University of Science and Technology, Kabale, Uganda
- Conflict Research Group, Ghent University, Ghent, Belgium
| | - Robert Bitariho
- Institute of Tropical Forest Conservation, Mbarara University of Science and Technology, Kabale, Uganda
| | - Santiago Espinosa
- Facultad de Ciencias, Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico
- Escuela de Biología, Pontificia Universidad Católica del Ecuador, Quito, Ecuador
| | - Patrick A Jansen
- Smithsonian Tropical Research Institute, Ancon, Republic of Panama
- Wildlife Ecology & Conservation Group, Wageningen University and Research, Wageningen, the Netherlands
| | - Marcela Guimarães Moreira Lima
- Biogeography of Conservation and Macroecology Laboratory, Institute of Biological Sciences, Universidade Federal do Pará, Pará, Brazil
| | - Emanuel H Martin
- Department of Wildlife Management, College of African Wildlife Management, Mweka, Tanzania
| | - Badru Mugerwa
- Department of Ecological Dynamics, Leibniz Institute for Zoo and Wildlife Research, Berlin, Germany
- Faculty VI-Planning Building Environment, Institute of Ecology, Technische Universität Berlin, Berlin, Germany
| | - Francesco Rovero
- Department of Biology, University of Florence, Florence, Italy
- MUSE-Museo delle Scienze, Trento, Italy
| | | | | | - Richard Bischof
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway
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6
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Greco I, Paddock CL, McCabe GM, Barelli C, Shinyambala S, Mtui AS, Rovero F. Calibrating occupancy to density estimations to assess abundance and vulnerability of a threatened primate in Tanzania. Ecosphere 2023. [DOI: 10.1002/ecs2.4427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023] Open
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7
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Greyling E, Comley J, Cherry MI, Leslie AJ, Müller L. Facilitation of a free-roaming apex predator in working lands: evaluating factors that influence leopard spatial dynamics and prey availability in a South African biodiversity hotspot. PeerJ 2023; 11:e14575. [PMID: 36718440 PMCID: PMC9884037 DOI: 10.7717/peerj.14575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2022] [Accepted: 11/28/2022] [Indexed: 01/26/2023] Open
Abstract
Apex predators ideally require vast intact spaces that support sufficient prey abundances to sustain them. In a developing world, however, it is becoming extremely difficult to maintain large enough areas to facilitate apex predators outside of protected regions. Free-roaming leopards (Panthera pardus) are the last remaining apex predator in the Greater Cape Floristic Region, South Africa, and face a multitude of threats attributable to competition for space and resources with humans. Using camera-trap data, we investigated the influence of anthropogenic land modification on leopards and the availability of their natural prey species in two contrasting communities-primarily protected (Cederberg) and agriculturally transformed (Piketberg). Potential prey species composition and diversity were determined, to indicate prey availability in each region. Factors influencing spatial utilisation by leopards and their main prey species were also assessed. Estimated potential prey species richness (Cederberg = 27, Piketberg = 26) and diversity indices (Cederberg-H' = 2.64, Ds = 0.90; Piketberg-H' = 2.46, Ds = 0.89), supported by both the Jaccard's Index (J = 0.73) and Sørensen's Coefficient (CC = 0.85), suggested high levels of similarity across the two regions. Main leopard prey species were present in both regions, but their relative abundances differed. Grey rhebok, klipspringer, and rock hyrax were more abundant in the Cederberg, while Cape grysbok, Cape porcupine, chacma baboon, and common duiker were more abundant in Piketberg. Leopards persisted across the agriculturally transformed landscape despite these differences. Occupancy modelling revealed that the spatial dynamics of leopards differed between the two regions, except for both populations preferring areas further away from human habitation. Overall, anthropogenic factors played a greater role in affecting spatial utilisation by leopards and their main prey species in the transformed region, whereas environmental factors had a stronger influence in the protected region. We argue that greater utilisation of alternative main prey species to those preferred in the protected region, including livestock, likely facilitates the persistence of leopards in the transformed region, and believe that this has further implications for human-wildlife conflict. Our study provides a baseline understanding of the potential direct and indirect impacts of agricultural landscape transformation on the behaviour of leopards and shows that heavily modified lands have the potential to facilitate mammalian diversity, including apex predators. We iterate that conservation measures for apex predators should be prioritised where they are present on working lands, and encourage the collaborative development of customised, cost-effective, multi-species conflict management approaches that facilitate coexistence.
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Affiliation(s)
- Eugene Greyling
- Department of Botany & Zoology, Stellenbosch University, Stellenbosch, Western Cape, South Africa,The Cape Leopard Trust, Cape Town, Western Cape, South Africa
| | - Jessica Comley
- Wildlife and Reserve Management Research Group, University of Mpumalanga, Mbombela, Mpumalanga, South Africa,Current Affiliation: Department of Environmental and Life Sciences, Universiti Brunei Darussalam, Brunei Darussalam
| | - Michael I. Cherry
- Department of Botany & Zoology, Stellenbosch University, Stellenbosch, Western Cape, South Africa
| | - Alison J. Leslie
- Department of Conservation Ecology & Entomology, Stellenbosch University, Stellenbosch, Western Cape, South Africa
| | - Lana Müller
- The Cape Leopard Trust, Cape Town, Western Cape, South Africa
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Haswell PM, López-Pérez AM, Clifford DL, Foley JE. Recovering an endangered vole and its habitat may help control invasive house mice. FOOD WEBS 2022. [DOI: 10.1016/j.fooweb.2022.e00267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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9
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Klees van Bommel J, Sun C, Ford AT, Todd M, Burton AC. Coexistence or conflict: Black bear habitat use along an urban-wildland gradient. PLoS One 2022; 17:e0276448. [PMID: 36445857 PMCID: PMC9707782 DOI: 10.1371/journal.pone.0276448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 10/07/2022] [Indexed: 12/03/2022] Open
Abstract
The urban-wildland interface is expanding and increasing the risk of human-wildlife conflict. Some wildlife species adapt to or avoid living near people, while others select for anthropogenic resources and are thus more prone to conflict. To promote human-wildlife coexistence, wildlife and land managers need to understand how conflict relates to habitat and resource use in the urban-wildland interface. We investigated black bear (Ursus americanus) habitat use across a gradient of human disturbance in a North American hotspot of human-black bear conflict. We used camera traps to monitor bear activity from July 2018 to July 2019, and compared bear habitat use to environmental and anthropogenic variables and spatiotemporal probabilities of conflict. Bears predominantly used areas of high vegetation productivity and increased their nocturnality near people. Still, bears used more high-conflict areas in summer and autumn, specifically rural lands with ripe crops. Our results suggest that bears are generally modifying their behaviours in the urban-wildland interface through spatial and temporal avoidance of humans, which may facilitate coexistence. However, conflict still occurs, especially in autumn when hyperphagia and peak crop availability attract bears to abundant rural food resources. To improve conflict mitigation practices, we recommend targeting seasonal rural attractants with pre-emptive fruit picking, bear-proof compost containment, and other forms of behavioural deterrence. By combining camera-trap monitoring of a large carnivore along an anthropogenic gradient with conflict mapping, we provide a framework for evidence-based improvements in human-wildlife coexistence.
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Affiliation(s)
- Joanna Klees van Bommel
- Department of Forest Resources Management, University of British Columbia, Vancouver, British Columbia, Canada
- * E-mail:
| | - Catherine Sun
- Department of Forest Resources Management, University of British Columbia, Vancouver, British Columbia, Canada
| | - Adam T. Ford
- Department of Biology, University of British Columbia Okanagan, Kelowna, British Columbia, Canada
| | - Melissa Todd
- British Columbia Ministry of Forests, Coast Area Research Section, Nanaimo, British Columbia, Canada
| | - A. Cole Burton
- Department of Forest Resources Management, University of British Columbia, Vancouver, British Columbia, Canada
- Biodiversity Research Centre, University of British Columbia, Vancouver, British Columbia, Canada
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10
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Davenport RN, Weaver M, Weiss KCB, Strauss EG. Spatiotemporal relationships of coyotes and free-ranging domestic cats as indicators of conflict in Culver City, California. PeerJ 2022; 10:e14169. [PMID: 36225908 PMCID: PMC9549883 DOI: 10.7717/peerj.14169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 09/12/2022] [Indexed: 01/21/2023] Open
Abstract
As habitat generalists, urban coyote (Canis latrans) populations often utilize an abundance of diverse food sources in cities. Within southern California, domestic cats (Felis catus) comprise a higher proportion of coyote diets than in other studied urban areas throughout the United States. However, it is unclear which ecological factors contribute to higher rates of cat depredation by coyotes in this region. While previous research suggests that coyote presence may have a negative effect on free-ranging domestic cat distributions, few studies have determined whether urban green spaces affect coyote or free-ranging domestic cat occurrence and activity within a predominantly urbanized landscape. We placed 20 remote wildlife cameras across a range of green spaces and residential sites in Culver City, California, an area of Los Angeles County experiencing pronounced coyote-domestic cat conflict. Using data collected across 6 months from 2019-2020, we assessed the influence of green space and prey species (i.e., cottontail rabbits (Sylvilagus spp.) and domestic cats) on coyote habitat use and activity. Coyotes exhibited a preference for sites with higher amounts of green space, while domestic cat habitat use was high throughout our study region. Although cottontail rabbit habitat use was also highly associated with urban green space, neither cottontails nor domestic cats appeared to temporally overlap significantly with coyotes. Unlike other cities where coyotes and domestic cats exhibit strong habitat partitioning across the landscape, domestic cats and coyotes spatially overlapped in green space fragments throughout Culver City. We suggest that this pattern of overlap may be responsible for the frequent cases of domestic cat depredation by coyotes in Culver City.
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Affiliation(s)
- Rebecca N. Davenport
- Center for Urban Resilience, Loyola Marymount University, Los Angeles, California, United States,Department of Forestry and Natural Resources, University of Kentucky, Lexington, Kentucky, United States
| | - Melinda Weaver
- Center for Urban Resilience, Loyola Marymount University, Los Angeles, California, United States
| | | | - Eric G. Strauss
- Center for Urban Resilience, Loyola Marymount University, Los Angeles, California, United States
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11
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Salvatori M, Oberosler V, Augugliaro C, Krofel M, Rovero F. Effects of free-ranging livestock on occurrence and interspecific interactions of a mammalian community. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2022; 32:e2644. [PMID: 35471769 PMCID: PMC9788037 DOI: 10.1002/eap.2644] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 01/21/2022] [Accepted: 03/02/2022] [Indexed: 06/14/2023]
Abstract
Mammalian communities inhabiting temperate grasslands are of conservation concern globally, especially in Central Asia, where livestock numbers have dramatically increased in recent decades, leading to overgrazing and land-use change. Yet, how this pervasive presence of livestock herds affects the community of wild mammals remains largely unstudied. We used systematic camera trapping at 216 sites across remote, mountainous areas of the Mongolian Altai Mountains to assess the spatial and temporal patterns of occurrence and the interspecific relationships within a mammalian community that includes different categories of livestock. By adopting a recently proposed multispecies occupancy model that incorporates interspecific correlation in occupancy, we found several statistically strong correlations in occupancy among species pairs, with the majority involving livestock. The sign of such associations was markedly species-dependent, with larger wild species of conservation concern, namely, snow leopard and Siberian ibex, avoiding livestock presence. As predicted, we found evidence of a positive correlation in occupancy between predators and their respective main prey. Contrary to our expectations, a number of intraguild species pairs also showed positive co-occurrence, with no evidence of spatiotemporal niche partitioning. Overall, our study suggests that livestock encroaching into protected areas influences the whole local community of wild mammals. Though pastoralism has coexisted with wildlife for millennia in central Asian grasslands, our findings suggest that policies and practices to decrease the pressure of livestock husbandry on wildlife are needed, with special attention on large species, such as the snow leopard and its wild prey, which seem to be particularly sensitive to this pervasive livestock presence.
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Affiliation(s)
- Marco Salvatori
- Department of BiologyUniversity of FlorenceSesto FiorentinoItaly
- MUSE ‐ Science Museum of TrentoTrentoItaly
| | | | - Claudio Augugliaro
- Department of Ecology and EvolutionUniversity of LausanneLausanneSwitzerland
- Wildlife Initiative NGOUlaanbaatarMongolia
| | - Miha Krofel
- Department of Forestry, Biotechnical FacultyUniversity of LjubljanaLjubljanaSlovenia
| | - Francesco Rovero
- Department of BiologyUniversity of FlorenceSesto FiorentinoItaly
- MUSE ‐ Science Museum of TrentoTrentoItaly
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12
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Parren MK, Furnas BJ, Barton DC, Nelson MD, Clucas B. Drought and coyotes mediate mesopredator response to human disturbance. Ecosphere 2022. [DOI: 10.1002/ecs2.4258] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Affiliation(s)
- Molly K. Parren
- Department of Wildlife California Polytechnic State University Humboldt California USA
| | - Brett J. Furnas
- Wildlife Health Laboratory California Department of Fish and Wildlife Rancho Cordova California USA
| | - Daniel C. Barton
- Department of Wildlife California Polytechnic State University Humboldt California USA
| | - Misty D. Nelson
- California Department of Fish and Wildlife Sacramento California USA
| | - Barbara Clucas
- Department of Wildlife California Polytechnic State University Humboldt California USA
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13
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Density estimation of non-independent unmarked animals from camera traps. Ecol Modell 2022. [DOI: 10.1016/j.ecolmodel.2022.110100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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14
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Whitworth A, Beirne C, Basto A, Flatt E, Tobler M, Powell G, Terborgh J, Forsyth A. Disappearance of an ecosystem engineer, the white-lipped peccary (Tayassu pecari), leads to density compensation and ecological release. Oecologia 2022; 199:937-949. [PMID: 35963917 PMCID: PMC9464176 DOI: 10.1007/s00442-022-05233-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 07/25/2022] [Indexed: 11/28/2022]
Abstract
Given the rate of biodiversity loss, there is an urgent need to understand community-level responses to extirpation events, with two prevailing hypotheses. On one hand, the loss of an apex predator leads to an increase in primary prey species, triggering a trophic cascade of other changes within the community, while density compensation and ecological release can occur because of reduced competition for resources and absence of direct aggression. White-lipped peccary (Tayassu pecari—WLP), a species that typically co-occurs with collared peccary (Pecari tajacu), undergo major population crashes—often taking 20 to 30-years for populations to recover. Using a temporally replicated camera trapping dataset, in both a pre- and post- WLP crash, we explore how WLP disappearance alters the structure of a Neotropical vertebrate community with findings indicative of density compensation. White-lipped peccary were the most frequently detected terrestrial mammal in the 2006–2007 pre-population crash period but were undetected during the 2019 post-crash survey. Panthera onca (jaguar) camera trap encounter rates declined by 63% following the WLP crash, while collared peccary, puma (Puma concolor), red-brocket deer (Mazama americana) and short-eared dog (Atelocynus microtis) all displayed greater encounter rates (490%, 150%, 280%, and 500% respectively), and increased in rank-abundance. Absence of WLP was correlated with ecological release changes in habitat-use for six species, with the greatest increase in use in the preferred floodplain habitat of the WLP. Surprisingly, community-weighted mean trait distributions (body size, feeding guild and nocturnality) did not change, suggesting functional redundancy in diverse tropical mammal assemblages.
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Affiliation(s)
- Andrew Whitworth
- Osa Conservation, Washington, DC, USA. .,Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, Scotland, UK. .,Department of Biology, Center for Energy, Environment, and Sustainability, Wake Forest University, Winston-Salem, NC, USA.
| | - Christopher Beirne
- Department of Forest Resources Management, University of British Columbia, Vancouver, Canada
| | - Arianna Basto
- Osa Conservation, Washington, DC, USA.,Conservación Amazónica, Lima, Perú.,Human Dimensions of Natural Resources, Colorado State University, Fort Collins, CO, USA
| | | | | | | | - John Terborgh
- Nicholas School of the Environment, Duke University, Durham, NC, USA
| | - Adrian Forsyth
- Osa Conservation, Washington, DC, USA.,Andes Amazon Fund, Washington, DC, USA
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15
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Boback SM, Nafus MG, Yackel Adams AA, Reed RN. Invasive brown treesnakes (Boiga irregularis) move short distances and have small activity areas in a high prey environment. Sci Rep 2022; 12:12705. [PMID: 35882893 PMCID: PMC9325984 DOI: 10.1038/s41598-022-16660-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 07/13/2022] [Indexed: 11/09/2022] Open
Abstract
Animal movements reflect temporal and spatial availability of resources as well as when, where, and how individuals access such resources. To test these relationships for a predatory reptile, we quantified the effects of prey abundance on the spatial ecology of invasive brown treesnakes (Boiga irregularis) on Guam. Five months after toxicant-mediated suppression of a brown treesnake population, we simultaneously used visual encounter surveys to generate relative rodent abundance and radiotelemetry of snakes to document movements of surviving snakes. After snake suppression, encounter rates for small mammals increased 22-fold and brown treesnakes had smaller mean daily movement distances (24 ± 13 m/day, [Formula: see text] ± SD) and activity areas (5.47 ± 5 ha) than all previous observations. Additionally, snakes frequenting forest edges, where our small mammal encounters were the highest, had smaller mean daily movement distances and three-dimensional activity volumes compared to those within the forest interior. Collectively, these results suggest that reduced movements by snakes were in part a response to increased prey availability. The impact of prey availability on snake movement may be a management consideration when attempting to control cryptic invasive species using tools that rely on movement of the target species to be effective.
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Affiliation(s)
- Scott M Boback
- Department of Biology, Dickinson College, Carlisle, PA, USA.
| | - Melia G Nafus
- Fort Collins Science Center, U.S. Geological Survey, Fort Collins, CO, USA
| | - Amy A Yackel Adams
- Fort Collins Science Center, U.S. Geological Survey, Fort Collins, CO, USA
| | - Robert N Reed
- Fort Collins Science Center, U.S. Geological Survey, Fort Collins, CO, USA.,Pacific Island Ecosystems Research Center, U.S. Geological Survey, Hawaii National Park, HI, USA
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16
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Procko M, Naidoo R, LeMay V, Burton AC. Human impacts on mammals in and around a protected area before, during, and after
COVID
‐19 lockdowns. CONSERVATION SCIENCE AND PRACTICE 2022; 4:e12743. [PMID: 35935172 PMCID: PMC9347595 DOI: 10.1111/csp2.12743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 04/08/2022] [Accepted: 05/13/2022] [Indexed: 11/28/2022] Open
Affiliation(s)
- Michael Procko
- Department of Forest Resources Management, Forest Sciences Centre University of British Columbia Vancouver British Columbia Canada
| | - Robin Naidoo
- WWF‐US Washington District of Columbia USA
- Institute for Resources, Environment and Sustainability University of British Columbia Vancouver British Columbia Canada
| | - Valerie LeMay
- Department of Forest Resources Management, Forest Sciences Centre University of British Columbia Vancouver British Columbia Canada
| | - A. Cole Burton
- Department of Forest Resources Management, Forest Sciences Centre University of British Columbia Vancouver British Columbia Canada
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17
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Garvey PM, Glen AS, Clout MN, Nichols M, Pech RP. Niche partitioning in a guild of invasive mammalian predators. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2022; 32:e2566. [PMID: 35138656 PMCID: PMC9285952 DOI: 10.1002/eap.2566] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 08/24/2021] [Accepted: 09/15/2021] [Indexed: 05/28/2023]
Abstract
Predators compete aggressively for resources, establishing trophic hierarchies that influence ecosystem structure. Competitive interactions are particularly important in invaded ecosystems where introduced predators can suppress native prey species. We investigated whether niche partitioning exists within a guild of invasive mammalian predators and determined the consequences for native species. Over 4405 camera-trap days, we assessed interactions among three invasive predators: two apex predators (feral cats Felis catus and ferrets Mustela furo) and a mesopredator (stoats Mustela erminea), in relation to their primary prey (lagomorphs, rodents and birds) and habitat use. Further, we tested for mesopredator release by selectively removing cats and ferrets in a pulse perturbation experiment. We found compelling evidence of niche partitioning; spatiotemporal activity of apex predators maximized access to abundant invasive prey, with ferrets targeting lagomorphs and cats targeting rodents. Mesopredators adjusted their behavior to reduce the risk of interference competition, thereby restricting access to abundant prey but increasing predation pressure on diurnal native birds. Stoats were only recorded at the treatment site after both larger predators were removed, becoming the most frequently detected predator at 6 months post-perturbation. We suggest there is spatial and resource partitioning within the invasive predator guild, but that this is incomplete, and avoidance is achieved by temporal partitioning within overlapping areas. Niche partitioning among invasive predators facilitates coexistence, but simultaneously intensifies predation pressure on vulnerable native species.
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Affiliation(s)
| | | | - Mick N. Clout
- Centre for Biodiversity and Biosecurity, School of Biological SciencesUniversity of AucklandAucklandNew Zealand
| | - Margaret Nichols
- Centre for Wildlife Management and ConservationLincoln UniversityCanterburyNew Zealand
| | - Roger P. Pech
- Manaaki Whenua – Landcare ResearchLincolnNew Zealand
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18
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Fisher JT, Ladle A. Syntopic species interact with large boreal mammals' response to anthropogenic landscape change. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 822:153432. [PMID: 35090931 DOI: 10.1016/j.scitotenv.2022.153432] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 01/07/2022] [Accepted: 01/22/2022] [Indexed: 06/14/2023]
Abstract
Landscape change alters species' distributions, and understanding these changes is a key ecological and conservation goal. Species-habitat relationships are often modelled in the absence of syntopic species, but niche theory and emerging empirical research suggests heterospecifics should entrain (and statistically explain) variability in distribution, perhaps synergistically by interacting with landscape features. We examined the effects of syntopic species in boreal mammals' relationship to landscape change, using three years of camera-trap data in the western Nearctic boreal forest. Using an information-theoretic framework, we weighed evidence for additive and interactive variables measuring heterospecifics' co-occurrence in species distribution models built on natural and anthropogenic landscape features. We competed multiple hypotheses about the roles of natural features, anthropogenic features, predators, competitors, and species-habitat interaction terms in explaining relative abundance of carnivores, herbivores, and omnivores/scavengers. For most species, models including heterospecifics explained occurrence frequency better than landscape features alone. Dominant predator (wolf) occurrence was best explained by prey, while prey species were explained by apparent competitors and subdominant predators. Evidence for interactions between landscape features and heterospecifics was strong for coyotes and wolves but variable for other species. Boreal mammals' spatial distribution is a function of heterospecific co-occurrence as well as landscape features, with synergistic effects observed for most species. Understanding species' responses to anthropogenic landscape change thus requires a multi-taxa approach that incorporates interspecific relationships, enabling better inference into underlying processes from observed patterns.
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Affiliation(s)
- Jason T Fisher
- School of Environmental Studies, University of Victoria, PO Box 1700 STN CSC, Victoria, British Columbia V8W 2Y2, Canada.
| | - Andrew Ladle
- School of Environmental Studies, University of Victoria, PO Box 1700 STN CSC, Victoria, British Columbia V8W 2Y2, Canada
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19
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Vargas Soto JS, Beirne C, Whitworth A, Cruz Diaz JC, Flatt E, Pillco-Huarcaya R, Olson ER, Azofeifa A, Saborío-R G, Salom-Pérez R, Espinoza-Muñoz D, Hay L, Whittaker L, Roldán C, Bedoya-Arrieta R, Broadbent EN, Molnár PK. Human disturbance and shifts in vertebrate community composition in a biodiversity hotspot. CONSERVATION BIOLOGY : THE JOURNAL OF THE SOCIETY FOR CONSERVATION BIOLOGY 2022; 36:e13813. [PMID: 34342042 DOI: 10.1111/cobi.13813] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 07/07/2021] [Accepted: 07/14/2021] [Indexed: 06/13/2023]
Abstract
Understanding how human modification of the landscape shapes vertebrate community composition is vital to understanding the current status and future trajectory of wildlife. Using a participatory approach, we deployed the largest camera-trap network in Mesoamerica to date to investigate how anthropogenic disturbance shapes the occupancy and co-occurrence of terrestrial vertebrate species in a tropical biodiversity hotspot: the Osa Peninsula, Costa Rica. We estimated species richness in different categories of land protection with rarefaction analysis and estimated the expected occupancy with a joint species distribution model that included covariates for anthropogenic disturbance, land protection, habitat quality, and habitat availability. Areas with the most stringent land-use protections (e.g., Corcovado National Park, 24 species [95% CI 23-25]) harbored significantly more species than unprotected areas (20 species [19.7-20.3]), mainly due to a reduced presence of large-bodied species of conservation concern in unprotected areas (e.g., jaguar Panthera onca and white-lipped peccary Tayassu pecari). Small-bodied generalist species, such as opossums (Didelphidae) and armadillos (Dasypus novemcinctus), in contrast, were more common at disturbed sites, resulting in a significant difference in vertebrate community composition between sites with low and high disturbance. Co-occurrence of species was also mainly associated with response to disturbance. Similar responses to disturbance create two groups of species, those whose site-level occupancy usually increased as anthropogenic disturbance increased and those whose estimated occupancy decreased. The absence of large-bodied species entails an important loss of ecological function in disturbed areas and can hinder forest development and maintenance. Efforts to protect and restore forested landscapes are likely having a positive effect on the abundance of some threatened species. These efforts, however, must be sustained and expanded to increase connectivity and ensure the long-term viability of the wildlife community.
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Affiliation(s)
- Juan S Vargas Soto
- Laboratory of Quantitative Global Change Ecology, Biological Sciences Department, University of Toronto, Scarborough, Ontario, Canada
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada
| | - Christopher Beirne
- Department of Forest Resources Management, University of British Columbia, Vancouver, British Columbia, Canada
| | - Andrew Whitworth
- Osa Conservation, Washington, DC, USA
- Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Juan Carlos Cruz Diaz
- Department of Environmental Conservation, University of Massachusetts, Amherst, Massachusetts, USA
- Namá Conservation, Heredia, Costa Rica
| | | | - Ruthmery Pillco-Huarcaya
- Osa Conservation, Washington, DC, USA
- Universidad Nacional San Antonio Abad del Cusco (UNSAAC), Cusco, Perú
| | | | - Alejandro Azofeifa
- Sistema Nacional de Áreas de Conservación, Área de Conservación Osa, Golfito, Costa Rica
| | - Guido Saborío-R
- Sistema Nacional de Áreas de Conservación, Área de Conservación Osa, Golfito, Costa Rica
| | | | | | - Leslie Hay
- Southwestern Region Wildlife Program, U.S. Forest Service, Albuquerque, New Mexico, USA
| | - Lawrence Whittaker
- Osa Conservation, Washington, DC, USA
- Rainforest Connection, San Francisco, California, USA
| | - Carmen Roldán
- Fondo Nacional de Financiamiento Forestal, San José, Costa Rica
| | | | - Eben North Broadbent
- Spatial Ecology and Conservation (SPEC) Lab, School of Forest Resources and Conservation, University of Florida, Gainesville, Florida, USA
| | - Péter K Molnár
- Laboratory of Quantitative Global Change Ecology, Biological Sciences Department, University of Toronto, Scarborough, Ontario, Canada
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada
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20
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Di Bitetti MS, Iezzi ME, Cruz P, Cirignoli S, Varela D, De Angelo C. Enemies or good neighbors? No indication of spatial or temporal avoidance between two sympatric South
American canids. J Zool (1987) 2022. [DOI: 10.1111/jzo.12965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- M. S. Di Bitetti
- Instituto de Biología Subtropical (IBS) Universidad Nacional de Misiones (UNaM) ‐ CONICET Puerto Iguazú Argentina
- Asociación Civil Centro de Investigaciones del Bosque Atlántico Puerto Iguazú Argentina
- Facultad de Ciencias Forestales UNaM Eldorado Argentina
| | - M. E. Iezzi
- Instituto de Biología Subtropical (IBS) Universidad Nacional de Misiones (UNaM) ‐ CONICET Puerto Iguazú Argentina
- Asociación Civil Centro de Investigaciones del Bosque Atlántico Puerto Iguazú Argentina
| | - P. Cruz
- Instituto de Biología Subtropical (IBS) Universidad Nacional de Misiones (UNaM) ‐ CONICET Puerto Iguazú Argentina
- Asociación Civil Centro de Investigaciones del Bosque Atlántico Puerto Iguazú Argentina
- Facultad de Ciencias Forestales UNaM Eldorado Argentina
| | - S. Cirignoli
- Asociación Civil Centro de Investigaciones del Bosque Atlántico Puerto Iguazú Argentina
| | - D. Varela
- Instituto de Biología Subtropical (IBS) Universidad Nacional de Misiones (UNaM) ‐ CONICET Puerto Iguazú Argentina
- Asociación Civil Centro de Investigaciones del Bosque Atlántico Puerto Iguazú Argentina
| | - C. De Angelo
- Asociación Civil Centro de Investigaciones del Bosque Atlántico Puerto Iguazú Argentina
- Instituto de Ciencias de la Tierra Biodiversidad y Ambiente (ICBIA) Universidad Nacional de Río Cuarto (UNRC) – CONICET Río Cuarto Argentina
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21
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van den Burg MP, Madden H, van Wagensveld TP, Boman E. Hurricane‐associated population decrease in a critically endangered long‐lived reptile. Biotropica 2022. [DOI: 10.1111/btp.13087] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Matthijs P. van den Burg
- IUCN SSC Iguana Specialist Group Gland Switzerland
- BioCoRe S. Coop. Madrid Spain
- Department of Biogeography and Global Change Museo Nacional de Ciencias Naturales Consejo Superior de Investigaciones Científicas (CSIC) Madrid Spain
| | - Hannah Madden
- IUCN SSC Iguana Specialist Group Gland Switzerland
- Caribbean Netherlands Science Institute St. Eustatius The Netherlands
- NIOZ Royal Netherlands Institute for Sea Research Utrecht University Texel The Netherlands
| | - Timothy P. van Wagensveld
- IUCN SSC Iguana Specialist Group Gland Switzerland
- Reptile Amphibian Fish Research the Netherlands Nijmegen The Netherlands
| | - Erik Boman
- St. Eustatius National Park Foundation St. Eustatius The Netherlands
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22
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Santini G, Abolaffio M, Ossi F, Franzetti B, Cagnacci F, Focardi S. Population assessment without individual identification using camera-traps: a comparison of four methods. Basic Appl Ecol 2022. [DOI: 10.1016/j.baae.2022.03.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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23
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Aurich-Rodriguez F, Piana RP, Appleton RD, Burton AC. Threatened Andean bears are negatively affected by human disturbance and free-ranging cattle in a protected area in northwest Peru. Mamm Biol 2022. [DOI: 10.1007/s42991-021-00217-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Chen C, Brodie JF, Kays R, Davies TJ, Liu R, Fisher JT, Ahumada J, McShea W, Sheil D, Agwanda B, Andrianarisoa MH, Appleton RD, Bitariho R, Espinosa S, Grigione MM, Helgen KM, Hubbard A, Hurtado CM, Jansen PA, Jiang X, Jones A, Kalies EL, Kiebou‐Opepa C, Li X, Lima MGM, Meyer E, Miller AB, Murphy T, Piana R, Quan R, Rota CT, Rovero F, Santos F, Schuttler S, Uduman A, Bommel JK, Young H, Burton AC. Global camera trap synthesis highlights the importance of protected areas in maintaining mammal diversity. Conserv Lett 2022. [DOI: 10.1111/conl.12865] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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25
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Greco I, Oberosler V, Monti IE, Augugliaro C, Barashkova A, Rovero F. Spatio‐temporal occurrence and sensitivity to livestock husbandry of Pallas's cat in the Mongolian Altai. J Wildl Manage 2022. [DOI: 10.1002/jwmg.22150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ilaria Greco
- Department of Biology University of Florence via Madonna del Piano 6 50019 Sesto Fiorentino Italy
| | - Valentina Oberosler
- MUSE—Museo delle Scienze Corso del Lavoro e della Scienza 3 38122 Trento Italy
| | - Ibra Edoardo Monti
- Department of Biology University of Florence via Madonna del Piano 6 50019 Sesto Fiorentino Italy
| | - Claudio Augugliaro
- Department of Ecology and Evolution University of Lausanne, CH‐1015, Lausanne, Switzerland and Wildlife Initiative Bayangol District, 6th Khoroo, Micro District 10 Ulaanbaatar 210349 Mongolia
| | - Anna Barashkova
- Siberian Environmental Center P. O. Box 547 630090 Novosibirsk Russia
| | - Francesco Rovero
- Department of Biology University of Florence via Madonna del Piano 6 50019 Sesto Fiorentino Italy
- MUSE—Museo delle Scienze Corso del Lavoro e della Scienza 3 38122 Trento Italy
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26
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Holzner A, Rayan DM, Moore J, Tan CKW, Clart L, Kulik L, Kühl H, Ruppert N, Widdig A. Occupancy of wild southern pig-tailed macaques in intact and degraded forests in Peninsular Malaysia. PeerJ 2021; 9:e12462. [PMID: 34993012 PMCID: PMC8679909 DOI: 10.7717/peerj.12462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 10/18/2021] [Indexed: 11/30/2022] Open
Abstract
Deforestation is a major threat to terrestrial tropical ecosystems, particularly in Southeast Asia where human activities have dramatic consequences for the survival of many species. However, responses of species to anthropogenic impact are highly variable. In order to establish effective conservation strategies, it is critical to determine a species’ ability to persist in degraded habitats. Here, we used camera trapping data to provide the first insights into the temporal and spatial distribution of southern pig-tailed macaques (Macaca nemestrina, listed as ‘Vulnerable’ by the IUCN) across intact and degraded forest habitats in Peninsular Malaysia, with a particular focus on the effects of clear-cutting and selective logging on macaque occupancy. Specifically, we found a 10% decline in macaque site occupancy in the highly degraded Pasoh Forest Reserve from 2013 to 2017. This may be strongly linked to the macaques’ sensitivity to intensive disturbance through clear-cutting, which significantly increased the probability that M. nemestrina became locally extinct at a previously occupied site. However, we found no clear relationship between moderate disturbance, i.e., selective logging, and the macaques’ local extinction probability or site occupancy in the Pasoh Forest Reserve and Belum-Temengor Forest Complex. Further, an identical age and sex structure of macaques in selectively logged and completely undisturbed habitat types within the Belum-Temengor Forest Complex indicated that the macaques did not show increased mortality or declining birth rates when exposed to selective logging. Overall, this suggests that low to moderately disturbed forests may still constitute valuable habitats that support viable populations of M. nemestrina, and thus need to be protected against further degradation. Our results emphasize the significance of population monitoring through camera trapping for understanding the ability of threatened species to cope with anthropogenic disturbance. This can inform species management plans and facilitate the development of effective conservation measures to protect biodiversity.
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Affiliation(s)
- Anna Holzner
- Department of Human Behaviour, Ecology and Culture, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
- Behavioural Ecology Research Group, Institute of Biology, University of Leipzig, Leipzig, Germany
- School of Biological Sciences, Universiti Sains Malaysia, Pulau Pinang, Malaysia
| | - D. Mark Rayan
- Durrell Institute of Conservation and Ecology (DICE), University of Kent, Canterbury, United Kingdom
- Wildlife Conservation Society (WCS) Malaysia Program, Petaling Jaya, Malaysia
| | - Jonathan Moore
- School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, China
- School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom
| | - Cedric Kai Wei Tan
- Wildlife Conservation Research Unit, Department of Zoology, University of Oxford, Oxford, United Kingdom
- School of Environmental and Geographical Sciences, University of Nottingham Malaysia, Semenyih, Malaysia
| | - Laura Clart
- Behavioural Ecology Research Group, Institute of Biology, University of Leipzig, Leipzig, Germany
| | - Lars Kulik
- Department of Human Behaviour, Ecology and Culture, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
| | - Hjalmar Kühl
- German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Germany
| | - Nadine Ruppert
- School of Biological Sciences, Universiti Sains Malaysia, Pulau Pinang, Malaysia
| | - Anja Widdig
- Department of Human Behaviour, Ecology and Culture, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
- Behavioural Ecology Research Group, Institute of Biology, University of Leipzig, Leipzig, Germany
- German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Germany
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27
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Deng S, Li J, Qu Y, He J, Liu K, Xue H, Cui P, Ruan X, Wu H. Camera trap reveals the co-occurrence patterns of two sympatric muntjac species in southern Anhui Province, China: No spatial segregation. Ecol Evol 2021; 11:17801-17809. [PMID: 35003640 PMCID: PMC8717271 DOI: 10.1002/ece3.8307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 10/09/2021] [Accepted: 10/20/2021] [Indexed: 11/10/2022] Open
Abstract
The competitive relationship and coexistence pattern among close related species have long been one of the hot issues in ecological research. Interspecies interactions can exert important influences on the local distribution of rare species. Black muntjac Muntiacus crinifrons is an endemic species to eastern China, currently restricted to limited regions. In contrast, Chinese muntjac Muntiacus reevesi is the most common and widespread deer in southern China. Both species co-occur in southern Anhui and western Zhejiang Province. Little is known about the interaction of these two sympatric-related species. In this study, to investigate the site use determinants and co-occurrence pattern of the two sympatric muntjac species, we conducted a camera trap survey across about 250 km2 in mountainous area of southern Anhui Province, China. We adopted a multistep approach to incorporate habitat preferences while modeling occupancy and detection. We found that the two species did not separate along elevation gradient (range from 400 m to 1,400 m) as described in previous studies. Results of single-species occupancy models indicated that elevation had positive effects on the site use of both species, while slope had an opposite influence on their site use. Positive effects of elevation on the site use implied that both species try to avoid human interference at low elevations. Significant negative effect of slope on the site use of black muntjac suggested that the species prefer habitat with gentle slope and avoided steep. Co-occurrence models and species interaction factors provided evidence that the two muntjac species had an independent occupancy (ψ BM CM = ψ BM cm, SIF = 1) and exhibited a positive species interaction in detection probability (p BM < r BM CM). Combined with the results of previous studies, we suggested that it was fine differentiation in microhabitats and food resources utilization rather spatial or temporal segregation that allowed the two species co-occurrence. The site use determinants revealed in our study would be useful for the habitat conservation and restoration for the rare black muntjac, and the co-occurrence pattern of the two sympatric muntjac species could provide useful information for deep understanding of the coexistence mechanism among forest-dwelling ungulates.
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Affiliation(s)
- Shuaitao Deng
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co‐founded by Anhui Province and Ministry of EducationProvincial Key Laboratory of Biotic Environment and Ecological Safety in AnhuiSchool of Ecology and EnvironmentAnhui Normal UniversityWuhuChina
- Shanghai Wildlife and Protected Natural Areas Research CenterShanghaiChina
| | - Jiaqi Li
- Ministry of Ecology and Environment of the People's Republic of ChinaNanjing Institute of Environmental SciencesNanjingChina
| | - Yashu Qu
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co‐founded by Anhui Province and Ministry of EducationProvincial Key Laboratory of Biotic Environment and Ecological Safety in AnhuiSchool of Ecology and EnvironmentAnhui Normal UniversityWuhuChina
| | - Jun He
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co‐founded by Anhui Province and Ministry of EducationProvincial Key Laboratory of Biotic Environment and Ecological Safety in AnhuiSchool of Ecology and EnvironmentAnhui Normal UniversityWuhuChina
| | - Kai Liu
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co‐founded by Anhui Province and Ministry of EducationProvincial Key Laboratory of Biotic Environment and Ecological Safety in AnhuiSchool of Ecology and EnvironmentAnhui Normal UniversityWuhuChina
| | - Hui Xue
- College of Life SciencesAnhui Normal UniversityWuhuChina
| | - Peng Cui
- Ministry of Ecology and Environment of the People's Republic of ChinaNanjing Institute of Environmental SciencesNanjingChina
| | - Xiangdong Ruan
- Academy of Inventory and PlanningNational Forestry and Grassland AdministrationBeijingChina
| | - Hailong Wu
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co‐founded by Anhui Province and Ministry of EducationProvincial Key Laboratory of Biotic Environment and Ecological Safety in AnhuiSchool of Ecology and EnvironmentAnhui Normal UniversityWuhuChina
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Hwang M, Ditmer MA, Teo S, Wong ST, Garshelis DL. Sun bears use 14‐year‐old previously logged forest more than primary forest in Sabah, Malaysia. Ecosphere 2021. [DOI: 10.1002/ecs2.3769] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Mei‐Hsiu Hwang
- Institute of Wildlife Conservation College of Veterinary Medicine National Pingtung University of Science and Technology 1, Shuehfu Rd., Neipu Pingtung 912 Taiwan
| | - Mark A. Ditmer
- Department of Fisheries, Wildlife, and Conservation Biology University of Minnesota Saint Paul Minnesota 55108 USA
- U.S.D.A. Forest Service Rocky Mountain Research Station, 324, 25th Street Ogden Utah 84401 USA
| | - Shu‐De Teo
- Institute of Wildlife Conservation College of Veterinary Medicine National Pingtung University of Science and Technology 1, Shuehfu Rd., Neipu Pingtung 912 Taiwan
| | - Siew Te Wong
- Bornean Sun Bear Conservation Centre Jalan Sepilok, Mile 14 Sandakan, Sabah 90000 Malaysia
| | - David L. Garshelis
- IUCN SSC Bear Specialist Group 35132 Hanna Road Cohasset Minnesota 55721 USA
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29
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Beirne C, Sun C, Tattersall ER, Burgar JM, Fisher JT, Burton AC. Multispecies modelling reveals potential for habitat restoration to re‐establish boreal vertebrate community dynamics. J Appl Ecol 2021. [DOI: 10.1111/1365-2664.14020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Christopher Beirne
- Department of Forest Resources Management University of British Columbia Vancouver British Columbia Canada
| | - Catherine Sun
- Department of Forest Resources Management University of British Columbia Vancouver British Columbia Canada
| | - Erin R. Tattersall
- Department of Forest Resources Management University of British Columbia Vancouver British Columbia Canada
| | - Joanna M. Burgar
- Department of Forest Resources Management University of British Columbia Vancouver British Columbia Canada
- School of Environmental Studies University of Victoria Vancouver British Columbia Canada
| | - Jason T. Fisher
- School of Environmental Studies University of Victoria Vancouver British Columbia Canada
| | - A. Cole Burton
- Department of Forest Resources Management University of British Columbia Vancouver British Columbia Canada
- Biodiversity Research Centre University of British Columbia Vancouver British Columbia Canada
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Lauret V, Labach H, Authier M, Gimenez O. Using single visits into integrated occupancy models to make the most of existing monitoring programs. Ecology 2021; 102:e03535. [PMID: 34514594 DOI: 10.1002/ecy.3535] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 06/21/2021] [Accepted: 07/08/2021] [Indexed: 11/07/2022]
Abstract
A major challenge in statistical ecology consists of integrating knowledge from different data sets to produce robust ecological indicators. To estimate species distribution, occupancy models are a flexible framework that can accommodate several data sets obtained from different sampling methods. However, repeating visits at sampling sites is a prerequisite for using standard occupancy models. Occupancy models were recently developed to analyze detection/non-detection data collected during a single visit. To date, single-visit occupancy models have never been used to integrate several different data sets. Here, we showcase an approach that combines two data sets into an integrated single-visit occupancy model. As a case study, we estimated the distribution of common bottlenose dolphin (Tursiops truncatus) over the northwestern Mediterranean Sea by combining 24,624 km of aerial surveys and 21,464 km of at-sea monitoring. We compared the outputs of single- vs. repeated-visit occupancy models into integrated occupancy models. Integrated models allowed a better sampling coverage of the targeted population, which provided a better precision for occupancy estimates than occupancy models using data sets in isolation. Overall, single- and repeated-visit integrated occupancy models produced similar inference about the distribution of bottlenose dolphins. We suggest that single-visit occupancy models open promising perspectives for the use of existing ecological data sets.
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Affiliation(s)
- Valentin Lauret
- CEFE, Univ Montpellier, CNRS, EPHE, IRD, Place Eugène Bataillon, Montpellier, 34000, France
| | - Hélène Labach
- CEFE, Univ Montpellier, CNRS, EPHE, IRD, Place Eugène Bataillon, Montpellier, 34000, France
- MIRACETI, Connaissance et conservation des cétacés, Place des traceurs de pierres, La Couronne, 13500, France
| | - Matthieu Authier
- ADERA, 162 avenue Albert Schweitzer, Pessac Cedex, 33608, France
- Observatoire PELAGIS, UMS 3462, CNRS-La Rochelle Université, 5 allée de l'Océan, La Rochelle, 17000, France
| | - Olivier Gimenez
- CEFE, Univ Montpellier, CNRS, EPHE, IRD, Place Eugène Bataillon, Montpellier, 34000, France
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31
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Thapa A, Pradhan PK, Joshi BD, Mukherjee T, Thakur M, Chandra K, Sharma LK. Non-protected areas demanding equitable conservation strategies as of protected areas in the Central Himalayan region. PLoS One 2021; 16:e0255082. [PMID: 34351983 PMCID: PMC8341489 DOI: 10.1371/journal.pone.0255082] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Accepted: 07/09/2021] [Indexed: 11/18/2022] Open
Abstract
The present study aims to explore the mammalian diversity of Darjeeling district using camera traps along with questionnaire survey in protected area (PA) and non- protected area (Non-PA). We also attempted to understand the influence of habitat variables on mammalian species richness using the generalized linear mixed models (GLMM). A total of 30 mammal species were recorded of which 21 species were detected through camera trapping with the most abundant records of barking deer (Muntiacus muntjak) and least of the elusive Chinese pangolin (Manis pentadactyla) and red panda (Ailurus fulgens). Additionally, melanistic forms of four mammals were also recorded. The mammalian species richness, their capture rate and naïve occupancy did not differ significantly among the PA and Non-PA. The GLMM revealed that the proportions of oak and bamboo in the forest, percentage canopy cover and camera trap operational days (wAICc = 0.145, wBIC = 0.603) were significant predictors of species richness in the study. We suggest Non-PA forest of Darjeeling should be given equal conservation importance as to the PA. Landscape based conservation planning will be imperative for achieving long term conservation goals in the study area.
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Affiliation(s)
- Avantika Thapa
- Zoological Survey of India, Kolkata, India
- University of Calcutta, Kolkata, India
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32
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Suraci JP, Gaynor KM, Allen ML, Alexander P, Brashares JS, Cendejas-Zarelli S, Crooks K, Elbroch LM, Forrester T, Green AM, Haight J, Harris NC, Hebblewhite M, Isbell F, Johnston B, Kays R, Lendrum PE, Lewis JS, McInturff A, McShea W, Murphy TW, Palmer MS, Parsons A, Parsons MA, Pendergast ME, Pekins C, Prugh LR, Sager-Fradkin KA, Schuttler S, Şekercioğlu ÇH, Shepherd B, Whipple L, Whittington J, Wittemyer G, Wilmers CC. Disturbance type and species life history predict mammal responses to humans. GLOBAL CHANGE BIOLOGY 2021; 27:3718-3731. [PMID: 33887083 DOI: 10.1111/gcb.15650] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Accepted: 03/25/2021] [Indexed: 06/12/2023]
Abstract
Human activity and land use change impact every landscape on Earth, driving declines in many animal species while benefiting others. Species ecological and life history traits may predict success in human-dominated landscapes such that only species with "winning" combinations of traits will persist in disturbed environments. However, this link between species traits and successful coexistence with humans remains obscured by the complexity of anthropogenic disturbances and variability among study systems. We compiled detection data for 24 mammal species from 61 populations across North America to quantify the effects of (1) the direct presence of people and (2) the human footprint (landscape modification) on mammal occurrence and activity levels. Thirty-three percent of mammal species exhibited a net negative response (i.e., reduced occurrence or activity) to increasing human presence and/or footprint across populations, whereas 58% of species were positively associated with increasing disturbance. However, apparent benefits of human presence and footprint tended to decrease or disappear at higher disturbance levels, indicative of thresholds in mammal species' capacity to tolerate disturbance or exploit human-dominated landscapes. Species ecological and life history traits were strong predictors of their responses to human footprint, with increasing footprint favoring smaller, less carnivorous, faster-reproducing species. The positive and negative effects of human presence were distributed more randomly with respect to species trait values, with apparent winners and losers across a range of body sizes and dietary guilds. Differential responses by some species to human presence and human footprint highlight the importance of considering these two forms of human disturbance separately when estimating anthropogenic impacts on wildlife. Our approach provides insights into the complex mechanisms through which human activities shape mammal communities globally, revealing the drivers of the loss of larger predators in human-modified landscapes.
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Affiliation(s)
- Justin P Suraci
- Center for Integrated Spatial Research, University of California, Santa Cruz, CA, USA
| | - Kaitlyn M Gaynor
- National Center for Ecological Analysis and Synthesis, University of California, Santa Barbara, CA, USA
| | - Maximilian L Allen
- Illinois Natural History Survey, University of Illinois, Champaign, IL, USA
- Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, IL, USA
| | | | - Justin S Brashares
- Department of Environmental Science, Policy, and Management, University of California, Berkeley, CA, USA
| | | | - Kevin Crooks
- Department of Fish, Wildlife and Conservation Biology, Colorado State University, Fort Collins, CO, USA
| | | | | | - Austin M Green
- School of Biological Sciences, University of Utah, Salt Lake City, UT, USA
| | - Jeffrey Haight
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
| | - Nyeema C Harris
- Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, USA
| | - Mark Hebblewhite
- Department of Ecosystem and Conservation Science, University of Montana, Missoula, MT, USA
| | - Forest Isbell
- Department of Ecology, Evolution and Behavior, University of Minnesota, St. Paul, MN, USA
| | | | - Roland Kays
- North Carolina Museum of Natural Sciences, Raleigh, NC, USA
- Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC, USA
| | - Patrick E Lendrum
- World Wildlife Fund, Northern Great Plains Program, Bozeman, MT, USA
| | - Jesse S Lewis
- College of Integrative Sciences and Arts, Arizona State University, Mesa, AZ, USA
| | | | - William McShea
- Smithsonian Conservation Biology Institute, Front Royal, VA, USA
| | | | - Meredith S Palmer
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, USA
| | - Arielle Parsons
- Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC, USA
| | | | | | - Charles Pekins
- Fort Hood Natural Resources Management Branch, United States Army Garrison, Fort Hood, TX, USA
| | - Laura R Prugh
- School of Environmental and Forest Sciences, University of Washington, Seattle, WA, USA
| | | | | | - Çağan H Şekercioğlu
- School of Biological Sciences, University of Utah, Salt Lake City, UT, USA
- Department of Molecular Biology and Genetics, Koç University, Istanbul, Turkey
| | | | - Laura Whipple
- Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, IL, USA
| | | | - George Wittemyer
- Department of Fish, Wildlife and Conservation Biology, Colorado State University, Fort Collins, CO, USA
| | - Christopher C Wilmers
- Center for Integrated Spatial Research, University of California, Santa Cruz, CA, USA
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33
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Emmet RL, Long RA, Gardner B. Modeling multi‐scale occupancy for monitoring rare and highly mobile species. Ecosphere 2021. [DOI: 10.1002/ecs2.3637] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Affiliation(s)
- Robert L. Emmet
- Quantitative Ecology and Resource Management University of Washington Seattle, Washington 98195 USA
| | | | - Beth Gardner
- School of Environmental and Forest Sciences University of Washington Seattle Washington 98195 USA
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34
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Hofmeester TR, Thorsen NH, Cromsigt JPGM, Kindberg J, Andrén H, Linnell JDC, Odden J. Effects of camera‐trap placement and number on detection of members of a mammalian assemblage. Ecosphere 2021. [DOI: 10.1002/ecs2.3662] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Tim R. Hofmeester
- Department of Wildlife, Fish, and Environmental Studies Swedish University of Agricultural Sciences Umeå SE‐90183 Sweden
| | - Neri H. Thorsen
- Norwegian Institute for Nature Research Sognsveien 68 Oslo NO‐0855 Norway
| | - Joris P. G. M. Cromsigt
- Department of Wildlife, Fish, and Environmental Studies Swedish University of Agricultural Sciences Umeå SE‐90183 Sweden
- Department of Zoology Centre for African Conservation Ecology Nelson Mandela University Port Elizabeth 6031 South Africa
- Copernicus Institute of Sustainable Development Environmental Sciences Utrecht University Utrecht 3548 The Netherlands
| | - Jonas Kindberg
- Department of Wildlife, Fish, and Environmental Studies Swedish University of Agricultural Sciences Umeå SE‐90183 Sweden
- Norwegian Institute for Nature Research PO Box 5685 Torgard Trondheim NO‐7485 Norway
| | - Henrik Andrén
- Department of Ecology Swedish University of Agricultural Sciences Grimsö Wildlife Research Station RiddarhyttanSE‐73993 Sweden
| | - John D. C. Linnell
- Norwegian Institute for Nature Research PO Box 5685 Torgard Trondheim NO‐7485 Norway
- Department of Forestry and Wildlife Management Inland Norway University of Applied Sciences Koppang NO‐2480 Norway
| | - John Odden
- Norwegian Institute for Nature Research Sognsveien 68 Oslo NO‐0855 Norway
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35
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Andrade-Ponce G, Cepeda-Duque JC, Mandujano S, Velásquez-C KL, Lizcano DJ, Gómez-Valencia B. Modelos de ocupación para datos de cámaras trampa. MAMMALOGY NOTES 2021. [DOI: 10.47603/mano.v7n1.200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
El uso de las cámaras trampa (CT) en la investigación de fauna silvestre puede generar conclusiones sesgadas cuando la detectabilidad imperfecta de especies no es considerada. Herramientas analíticas como los modelos de ocupación permiten estimar simultáneamente parámetros ecológicos corregidos por la probabilidad de detección. Sin embargo, es necesario implementar e interpretar de manera correcta los parámetros estimados por estos modelos para obtener inferencias con sentido biológico. Este trabajo presenta un marco conceptual base para diseñar de manera apropiada un análisis de ocupación por medio de datos de CT. Se discuten y se señalan recomendaciones generales para la definición de los elementos del modelo, el diseño del muestreo, así como estrategias de modelamiento estadísticos apropiadas dependiendo de los objetivos del estudio, las características de la especie y el tipo de datos obtenidos. Las decisiones tomadas por el investigador para definir cada uno de los componentes del modelo deben considerar la escala adecuada para que el fenómeno de estudio tenga sentido biológico. De esta manera, es posible generar inferencias y conclusiones robustas a partir de información de CT, lo que permite avanzar en el entendimiento de los mecanismos que subyacen a la ecología espacial de fauna silvestre y por lo tanto en su conservación.
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36
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Kolowski JM, Oley J, McShea WJ. High‐density camera trap grid reveals lack of consistency in detection and capture rates across space and time. Ecosphere 2021. [DOI: 10.1002/ecs2.3350] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Joseph M. Kolowski
- Smithsonian‐Mason School of Conservation Smithsonian Conservation Biology Institute 1500 Remount Road Front Royal Virginia22630USA
| | - Josephine Oley
- George Mason University 14557 Crossfield Way Woodbridge Virginia22192USA
| | - William J. McShea
- Center for Conservation Ecology Smithsonian Conservation Biology Institute 1500 Remount Road Front Royal Virginia22630USA
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37
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Fisher JT, Burton AC. Spatial structure of reproductive success infers mechanisms of ungulate invasion in Nearctic boreal landscapes. Ecol Evol 2021; 11:900-911. [PMID: 33520174 PMCID: PMC7820139 DOI: 10.1002/ece3.7103] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2020] [Revised: 10/21/2020] [Accepted: 11/03/2020] [Indexed: 11/11/2022] Open
Abstract
Landscape change is a key driver of biodiversity declines due to habitat loss and fragmentation, but spatially shifting resources can also facilitate range expansion and invasion. Invasive populations are reproductively successful, and landscape change may buoy this success.We show how modeling the spatial structure of reproductive success can elucidate the mechanisms of range shifts and sustained invasions for mammalian species with attendant young. We use an example of white-tailed deer (deer; Odocoileus virginianus) expansion in the Nearctic boreal forest, a North American phenomenon implicated in severe declines of threatened woodland caribou (Rangifer tarandus).We hypothesized that deer reproductive success is linked to forage subsidies provided by extensive landscape change via resource extraction. We measured deer occurrence using data from 62 camera traps in northern Alberta, Canada, over three years. We weighed support for multiple competing hypotheses about deer reproductive success using multistate occupancy models and generalized linear models in an AIC-based model selection framework.Spatial patterns of reproductive success were best explained by features associated with petroleum exploration and extraction, which offer early-seral vegetation resource subsidies. Effect sizes of anthropogenic features eclipsed natural heterogeneity by two orders of magnitude. We conclude that anthropogenic early-seral forage subsidies support high springtime reproductive success, mitigating or exceeding winter losses, maintaining populations. Synthesis and Applications. Modeling spatial structuring in reproductive success can become a key goal of remote camera-based global networks, yielding ecological insights into mechanisms of invasion and range shifts to inform effective decision-making for global biodiversity conservation.
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Affiliation(s)
- Jason T. Fisher
- School of Environmental StudiesUniversity of VictoriaVictoriaBCCanada
| | - A. Cole Burton
- InnoTech AlbertaVegrevilleABCanada
- Faculty of ForestryUniversity of British ColumbiaVancouverBCCanada
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38
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Rehman EU, Din JU, Ahmad S, Hameed S, Shah KA, Mehmood T, Nawaz MA. Insight into occupancy determinants and conflict dynamics of grey wolf (Canis lupus) in the dry temperate zone of Hindukush Range. Glob Ecol Conserv 2021. [DOI: 10.1016/j.gecco.2020.e01402] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
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39
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Di Bitetti MS, Iezzi ME, Cruz P, Varela D, De Angelo C. Effects of cattle on habitat use and diel activity of large native herbivores in a South American rangeland. J Nat Conserv 2020. [DOI: 10.1016/j.jnc.2020.125900] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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40
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Gomo G, Rød‐Eriksen L, Andreassen HP, Mattisson J, Odden M, Devineau O, Eide NE. Scavenger community structure along an environmental gradient from boreal forest to alpine tundra in Scandinavia. Ecol Evol 2020; 10:12860-12869. [PMID: 33304499 PMCID: PMC7713988 DOI: 10.1002/ece3.6834] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 08/26/2020] [Accepted: 09/04/2020] [Indexed: 12/19/2022] Open
Abstract
Scavengers can have strong impacts on food webs, and awareness of their role in ecosystems has increased during the last decades. In our study, we used baited camera traps to quantify the structure of the winter scavenger community in central Scandinavia across a forest-alpine continuum and assess how climatic conditions affected spatial patterns of species occurrences at baits. Canonical correspondence analysis revealed that the main habitat type (forest or alpine tundra) and snow depth was main determinants of the community structure. According to a joint species distribution model within the HMSC framework, species richness tended to be higher in forest than in alpine tundra habitat, but was only weakly associated with temperature and snow depth. However, we observed stronger and more diverse impacts of these covariates on individual species. Occurrence at baits by habitat generalists (red fox, golden eagle, and common raven) typically increased at low temperatures and high snow depth, probably due to increased energetic demands and lower abundance of natural prey in harsh winter conditions. On the contrary, occurrence at baits by forest specialists (e.g., Eurasian jay) tended to decrease in deep snow, which is possibly a consequence of reduced bait detectability and accessibility. In general, the influence of environmental covariates on species richness and occurrence at baits was lower in alpine tundra than in forests, and habitat generalists dominated the scavenger communities in both forest and alpine tundra. Following forecasted climate change, altered environmental conditions are likely to cause range expansion of boreal species and range contraction of typical alpine species such as the arctic fox. Our results suggest that altered snow conditions will possibly be a main driver of changes in species community structure.
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Affiliation(s)
- Gjermund Gomo
- Faculty of Applied Ecology, Agricultural Sciences and Biotechnology (Fac. Appl. Ecol.)Inland Norway University of Applied Sciences (INN)KoppangNorway
| | - Lars Rød‐Eriksen
- Norwegian Institute for Nature Research (NINA)TrondheimNorway
- Department of BiologyCentre for Biodiversity Dynamics (CBD)Norwegian University of Science and Technology (NTNU)TrondheimNorway
| | - Harry P. Andreassen
- Faculty of Applied Ecology, Agricultural Sciences and Biotechnology (Fac. Appl. Ecol.)Inland Norway University of Applied Sciences (INN)KoppangNorway
| | - Jenny Mattisson
- Norwegian Institute for Nature Research (NINA)TrondheimNorway
| | - Morten Odden
- Faculty of Applied Ecology, Agricultural Sciences and Biotechnology (Fac. Appl. Ecol.)Inland Norway University of Applied Sciences (INN)KoppangNorway
| | - Olivier Devineau
- Faculty of Applied Ecology, Agricultural Sciences and Biotechnology (Fac. Appl. Ecol.)Inland Norway University of Applied Sciences (INN)KoppangNorway
| | - Nina E. Eide
- Norwegian Institute for Nature Research (NINA)TrondheimNorway
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41
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Ellis JR, Petrovskaya NB. A computational study of density-dependent individual movement and the formation of population clusters in two-dimensional spatial domains. J Theor Biol 2020; 505:110421. [PMID: 32735993 DOI: 10.1016/j.jtbi.2020.110421] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 07/10/2020] [Accepted: 07/20/2020] [Indexed: 10/23/2022]
Abstract
The patterns of collective behaviour in a population emerging from individual animal movement have long been of interest to ecologists, as has the emergence of heterogeneous patterns among a population. In this paper we will consider these phenomena by using an individual-based modelling approach to simulate a population whose individuals undergo density-dependent movement in 2D spatial domains. We first show that the introduction of density-dependent movement in the form of two parameters, a perception radius and a probability of directed movement, leads to the formation of clusters. We then show that the properties of the clusters and their stability over time are different between populations of Brownian and non-Brownian walkers and are also dependent on the choice of parameters. Finally, we consider the effect of the probability of directed movement on the temporal stability of clusters and show that while clusters formed by Brownian and non-Brownian walkers may have similar properties with certain parameter sets, the spatio-temporal dynamics remain different.
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Affiliation(s)
- John R Ellis
- School of Mathematics, University of Birmingham, Birmingham, UK.
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42
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Naidoo R, Burton AC. Relative effects of recreational activities on a temperate terrestrial wildlife assemblage. CONSERVATION SCIENCE AND PRACTICE 2020. [DOI: 10.1111/csp2.271] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Affiliation(s)
- Robin Naidoo
- WWF‐US Washington District of Columbia USA
- Institute for Resources, Environment and Sustainability, University of British Columbia Vancouver British Columbia Canada
| | - A. Cole Burton
- Department of Forest Resources Management Forest Sciences Centre Vancouver British Columbia Canada
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43
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Tourani M, Brøste EN, Bakken S, Odden J, Bischof R. Sooner, closer, or longer: detectability of mesocarnivores at camera traps. J Zool (1987) 2020. [DOI: 10.1111/jzo.12828] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- M. Tourani
- Faculty of Environmental Sciences and Natural Resource Management Norwegian University of Life Sciences Ås Norway
| | - E. N. Brøste
- Faculty of Environmental Sciences and Natural Resource Management Norwegian University of Life Sciences Ås Norway
| | - S. Bakken
- Faculty of Environmental Sciences and Natural Resource Management Norwegian University of Life Sciences Ås Norway
| | - J. Odden
- Norwegian Institute for Nature Research Oslo Norway
| | - R. Bischof
- Faculty of Environmental Sciences and Natural Resource Management Norwegian University of Life Sciences Ås Norway
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Abstract
Abstract
The critical agenda for mammalian ecologists over this century is to obtain a synthetic and predictive understanding of the factors that limit the distribution and abundance of mammals on Earth. During the last 100 years, a start has been made on this agenda, but only a start. Most mammal species have been described, but there still are tropical areas of undisclosed species richness. We have been measuring changes in distribution and abundance of many common mammals during the last century, and this monitoring agenda has become more critical as climate change has accelerated and habitat destruction has increased with human population growth. There are a small number of factors that can limit the distribution and abundance of mammals: weather, predation, food supplies, disease, and social behavior. Weather limits distribution and abundance mostly in an indirect manner by affecting food supplies, disease, and predation in the short term and habitat composition and structure in the longer term. A good starting point for all studies of mammals is to define them within a well-structured trophic web, and then quantify the major linkages within that web. We still are far from having data on enough model systems to develop a complete theory and understanding of how food webs are structured and constrained as climate shifts and humans disturb habitats. We have many of the bits and pieces for some of our major ecosystems but a poor understanding of the links and the resilience of our mammalian communities to changes in trophic webs driven by climate change and human disturbances.
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Affiliation(s)
- Charles J Krebs
- Department of Zoology, University of British Columbia, Vancouver, BC, Canada
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Smith JA, Suraci JP, Hunter JS, Gaynor KM, Keller CB, Palmer MS, Atkins JL, Castañeda I, Cherry MJ, Garvey PM, Huebner SE, Morin DJ, Teckentrup L, Weterings MJA, Beaudrot L. Zooming in on mechanistic predator-prey ecology: Integrating camera traps with experimental methods to reveal the drivers of ecological interactions. J Anim Ecol 2020; 89:1997-2012. [PMID: 32441766 DOI: 10.1111/1365-2656.13264] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 03/10/2020] [Indexed: 11/27/2022]
Abstract
Camera trap technology has galvanized the study of predator-prey ecology in wild animal communities by expanding the scale and diversity of predator-prey interactions that can be analysed. While observational data from systematic camera arrays have informed inferences on the spatiotemporal outcomes of predator-prey interactions, the capacity for observational studies to identify mechanistic drivers of species interactions is limited. Experimental study designs that utilize camera traps uniquely allow for testing hypothesized mechanisms that drive predator and prey behaviour, incorporating environmental realism not possible in the laboratory while benefiting from the distinct capacity of camera traps to generate large datasets from multiple species with minimal observer interference. However, such pairings of camera traps with experimental methods remain underutilized. We review recent advances in the experimental application of camera traps to investigate fundamental mechanisms underlying predator-prey ecology and present a conceptual guide for designing experimental camera trap studies. Only 9% of camera trap studies on predator-prey ecology in our review use experimental methods, but the application of experimental approaches is increasing. To illustrate the utility of camera trap-based experiments using a case study, we propose a study design that integrates observational and experimental techniques to test a perennial question in predator-prey ecology: how prey balance foraging and safety, as formalized by the risk allocation hypothesis. We discuss applications of camera trap-based experiments to evaluate the diversity of anthropogenic influences on wildlife communities globally. Finally, we review challenges to conducting experimental camera trap studies. Experimental camera trap studies have already begun to play an important role in understanding the predator-prey ecology of free-living animals, and such methods will become increasingly critical to quantifying drivers of community interactions in a rapidly changing world. We recommend increased application of experimental methods in the study of predator and prey responses to humans, synanthropic and invasive species, and other anthropogenic disturbances.
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Affiliation(s)
- Justine A Smith
- Department of Wildlife, Fish, and Conservation Biology, University of California, Davis, CA, USA
| | - Justin P Suraci
- Environmental Studies Department, Center for Integrated Spatial Research, University of California, Santa Cruz, CA, USA
| | - Jennifer S Hunter
- Hastings Natural History Reservation, University of California, Berkeley, CA, USA
| | - Kaitlyn M Gaynor
- National Center for Ecological Analysis and Synthesis, Santa Barbara, CA, USA
| | - Carson B Keller
- Department of Biology, California State University, Northridge, CA, USA
| | - Meredith S Palmer
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, USA
| | - Justine L Atkins
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, USA
| | - Irene Castañeda
- Centre d'Ecologie et des Sciences de la Conservation (CESCO UMR 7204), Sorbonne Universités, MNHN, CNRS, UPMC, Paris, France.,Ecologie, Systématique et Evolution, UMR CNRS 8079, Université Paris-Sud, Orsay Cedex, France
| | - Michael J Cherry
- Caesar Kleberg Wildlife Research Institute, Texas A&M University - Kingsville, Kingsville, TX, USA
| | | | - Sarah E Huebner
- College of Biological Sciences, University of Minnesota, St. Paul, MN, USA
| | - Dana J Morin
- Department of Wildlife, Fisheries, & Aquaculture, Mississippi State University, Starkville, MS, USA
| | - Lisa Teckentrup
- BioMove Research Training Group, University of Potsdam, Potsdam, Germany
| | - Martijn J A Weterings
- Wildlife Ecology and Conservation Group, Wageningen University, Wageningen, The Netherlands.,Department of Wildlife Management, Van Hall Larenstein University of Applied Sciences, Leeuwarden, The Netherlands
| | - Lydia Beaudrot
- Department of BioSciences, Program in Ecology and Evolutionary Biology, Rice University, Houston, TX, USA
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Caravaggi A, Burton AC, Clark DA, Fisher JT, Grass A, Green S, Hobaiter C, Hofmeester TR, Kalan AK, Rabaiotti D, Rivet D. A review of factors to consider when using camera traps to study animal behavior to inform wildlife ecology and conservation. CONSERVATION SCIENCE AND PRACTICE 2020. [DOI: 10.1111/csp2.239] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Affiliation(s)
| | - A. Cole Burton
- Department of Forest Resources Management and Biodiversity Research CentreUniversity of British Columbia Vancouver Canada
| | - Douglas A. Clark
- School of Environment and Sustainability, University of Saskatchewan Saskatoon Saskatchewan Canada
| | | | - Amelia Grass
- School of Applied SciencesUniversity of South Wales Pontypridd UK
| | - Sian Green
- Department of AnthropologyDurham University Durham UK
| | - Catherine Hobaiter
- School of Psychology and NeuroscienceUniversity of St Andrews St Andrews UK
| | - Tim R. Hofmeester
- Department of Wildlife, Fish, and Environmental studiesSwedish University of Agricultural Sciences Umeå Sweden
| | - Ammie K. Kalan
- Department of PrimatologyMax Planck Institute for Evolutionary Anthropology Leipzig Germany
| | | | - Danielle Rivet
- Department of BiologyUniversity of Saskatchewan Saskatoon Saskatchewan Canada
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Fisher JT, Burton AC, Nolan L, Roy L. Influences of landscape change and winter severity on invasive ungulate persistence in the Nearctic boreal forest. Sci Rep 2020; 10:8742. [PMID: 32457474 PMCID: PMC7250834 DOI: 10.1038/s41598-020-65385-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 04/22/2020] [Indexed: 11/15/2022] Open
Abstract
Climate and landscape change are drivers of species range shifts and biodiversity loss; understanding how they facilitate and sustain invasions has been empirically challenging. Winter severity is decreasing with climate change and is a predicted mechanism of contemporary and future range shifts. For example, white-tailed deer (Odocoileus virginianus) expansion is a continental phenomenon across the Nearctic with ecological consequences for entire biotic communities. We capitalized on recent temporal variation in winter severity to examine spatial and temporal dynamics of invasive deer distribution in the Nearctic boreal forest. We hypothesized deer distribution would decrease in severe winters reflecting historical climate constraints, and remain more static in moderate winters reflecting recent climate. Further, we predicted that regardless of winter severity, deer distribution would persist and be best explained by early seral forage subsidies from extensive landscape change via resource extraction. We applied dynamic occupancy models in time, and species distribution models in space, to data from 62 camera traps sampled over 3 years in northeastern Alberta, Canada. Deer distribution shrank more markedly in severe winters but rebounded each spring regardless of winter severity. Deer distribution was best explained by anthropogenic landscape features assumed to provide early seral vegetation subsidy, accounting for natural landcover. We conclude that deer dynamics in the northern boreal forest are influenced both by landscape change across space and winter severity through time, the latter expected to further decrease with climate change. We contend that the combined influence of these two drivers is likely pervasive for many species, with changing resources offsetting or augmenting physiological limitations.
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Affiliation(s)
- Jason T Fisher
- University of Victoria, School of Environmental Studies, Victoria, British, Columbia, Canada.
- Former address: InnoTech Alberta, Bag 4000, Vegreville, Alberta, T9C1T4, Canada.
| | - A Cole Burton
- Former address: InnoTech Alberta, Bag 4000, Vegreville, Alberta, T9C1T4, Canada
- University of British Columbia, Department of Forest Resources Management, Forest Sciences Centre, 2045 - 2424 Main Mall, Vancouver, British, Columbia, V6T1Z4, Canada
| | - Luke Nolan
- Former address: InnoTech Alberta, Bag 4000, Vegreville, Alberta, T9C1T4, Canada
| | - Laurence Roy
- Former address: InnoTech Alberta, Bag 4000, Vegreville, Alberta, T9C1T4, Canada
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Li XY, Bleisch WV, Liu XW, Hu WQ, Jiang XL. Human disturbance and prey occupancy as predictors of carnivore richness and biomass in a Himalayan hotspot. Anim Conserv 2020. [DOI: 10.1111/acv.12600] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- X. Y. Li
- State Key Laboratory of Genetic Resources and Evolution Kunming Institute of Zoology Chinese Academy of Sciences Kunming Yunnan China
- Key Laboratory for Conservation and Utilization of Bio‐Resources Laboratory of Ecology and Evolutionary Biology Yunnan University Kunming China
| | - W. V. Bleisch
- China Exploration and Research Society SouthMark Hong Kong PRC
| | - X. W. Liu
- State Key Laboratory of Genetic Resources and Evolution Kunming Institute of Zoology Chinese Academy of Sciences Kunming Yunnan China
| | - W. Q. Hu
- State Key Laboratory of Genetic Resources and Evolution Kunming Institute of Zoology Chinese Academy of Sciences Kunming Yunnan China
| | - X. L. Jiang
- State Key Laboratory of Genetic Resources and Evolution Kunming Institute of Zoology Chinese Academy of Sciences Kunming Yunnan China
- Key Laboratory for Conservation and Utilization of Bio‐Resources Laboratory of Ecology and Evolutionary Biology Yunnan University Kunming China
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Crunchant A, Borchers D, Kühl H, Piel A. Listening and watching: Do camera traps or acoustic sensors more efficiently detect wild chimpanzees in an open habitat? Methods Ecol Evol 2020. [DOI: 10.1111/2041-210x.13362] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - David Borchers
- Centre for Research into Ecological and Environmental Modelling University of St Andrews St Andrews UK
| | - Hjalmar Kühl
- Max Planck Institute for Evolutionary Anthropology Leipzig Germany
| | - Alex Piel
- Liverpool John Moores University Liverpool UK
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McIntyre T, Majelantle TL, Slip DJ, Harcourt RG. Quantifying imperfect camera-trap detection probabilities: implications for density modelling. WILDLIFE RESEARCH 2020. [DOI: 10.1071/wr19040] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Abstract
ContextData obtained from camera traps are increasingly used to inform various population-level models. Although acknowledged, imperfect detection probabilities within camera-trap detection zones are rarely taken into account when modelling animal densities.
AimsWe aimed to identify parameters influencing camera-trap detection probabilities, and quantify their relative impacts, as well as explore the downstream implications of imperfect detection probabilities on population-density modelling.
MethodsWe modelled the relationships between the detection probabilities of a standard camera-trap model (n=35) on a remotely operated animal-shaped soft toy and a series of parameters likely to influence it. These included the distance of animals from camera traps, animal speed, camera-trap deployment height, ambient temperature (as a proxy for background surface temperatures) and animal surface temperature. We then used this detection-probability model to quantify the likely influence of imperfect detection rates on subsequent population-level models, being, in this case, estimates from random encounter density models on a known density simulation.
Key resultsDetection probabilities mostly varied predictably in relation to measured parameters, and decreased with an increasing distance from the camera traps and speeds of movement, as well as heights of camera-trap deployments. Increased differences between ambient temperature and animal surface temperature were associated with increased detection probabilities. Importantly, our results showed substantial inter-camera (of the same model) variability in detection probabilities. Resulting model outputs suggested consistent and systematic underestimation of true population densities when not taking imperfect detection probabilities into account.
ConclusionsImperfect, and individually variable, detection probabilities inside the detection zones of camera traps can compromise resulting population-density estimates.
ImplicationsWe propose a simple calibration approach for individual camera traps before field deployment and encourage researchers to actively estimate individual camera-trap detection performance for inclusion in subsequent modelling approaches.
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