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A test of motion‐sensitive cameras to index ungulate densities: group size matters. J Wildl Manage 2023. [DOI: 10.1002/jwmg.22356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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2
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Higashide D, Kuriyama T, Takagi S, Nakashima Y, Fukasawa K, Yajima G, Kasada M, Yokoyama M. Effectiveness of signs of activity as relative abundance indices for wild boar. WILDLIFE BIOLOGY 2021. [DOI: 10.2981/wlb.00869] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- Daishi Higashide
- D. Higashide (https://orcid.org/0000-0003-1186-1263) ✉ , T. Kuriyama, S. Takagi and M. Yokoyama, Inst. of Natural and Environmental Science, Univ. of Hyogo, Aogaki, Tamba, Hyogo, Japan. DH also at: Research Center for Wildlife Management, Gifu Univ
| | - Takeo Kuriyama
- D. Higashide (https://orcid.org/0000-0003-1186-1263) ✉ , T. Kuriyama, S. Takagi and M. Yokoyama, Inst. of Natural and Environmental Science, Univ. of Hyogo, Aogaki, Tamba, Hyogo, Japan. DH also at: Research Center for Wildlife Management, Gifu Univ
| | - Shun Takagi
- D. Higashide (https://orcid.org/0000-0003-1186-1263) ✉ , T. Kuriyama, S. Takagi and M. Yokoyama, Inst. of Natural and Environmental Science, Univ. of Hyogo, Aogaki, Tamba, Hyogo, Japan. DH also at: Research Center for Wildlife Management, Gifu Univ
| | - Yoshihiro Nakashima
- Y. Nakashima and G. Yajima, College of Bioresource Science, Nihon Univ., Fujisawa, Kanagawa, Japan
| | - Keita Fukasawa
- K. Fukasawa, Biodiversity Division, National Inst. for Environmental Studies, Tsukuba, Ibaraki, Japan
| | - Gota Yajima
- Y. Nakashima and G. Yajima, College of Bioresource Science, Nihon Univ., Fujisawa, Kanagawa, Japan
| | - Minoru Kasada
- M. Kasada, Graduate School of Agriculture and Life Sciences, Univ. of Tokyo, Bunkyo-ku, Tokyo, Japan and Graduate School of Life Sciences, Tohoku Univ., Aramaki, Aoba-ku, Sendai, Miyagi, Japan
| | - Mayumi Yokoyama
- D. Higashide (https://orcid.org/0000-0003-1186-1263) ✉ , T. Kuriyama, S. Takagi and M. Yokoyama, Inst. of Natural and Environmental Science, Univ. of Hyogo, Aogaki, Tamba, Hyogo, Japan. DH also at: Research Center for Wildlife Management, Gifu Univ
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3
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Wuesthoff EF, Fuller TK, Sutherland C, Kamilar JM, Ramanankirahina R, Rakotondravony R, Rouse S, Radespiel U. Differential habitat use by sympatric species of mouse lemurs across a mangrove–dry forest habitat gradient. J Mammal 2021. [DOI: 10.1093/jmammal/gyab082] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Understanding the mechanisms by which similar species coexist in sympatry is a major driver of ecological research. Niche partitioning and ecological plasticity can facilitate spatial and habitat use overlap between generalist and specialist species. Mouse lemurs (Microcebus spp.) are a highly speciose group of small primates that are endemic to the forests of Madagascar. In northwestern Madagascar, the relatively widespread M. murinus occurs sympatrically with the microendemic M. ravelobensis. We investigated spatial distributions and densities of these two species across a mangrove–dry forest habitat gradient in Mariarano commune. We used capture-mark-recapture techniques and nocturnal line transect surveys along six transects during June and July 2017. Spatial capture-recapture and distance sampling models were used to estimate lemur densities across habitat types. The congeners displayed differential patterns of spatial distribution and densities. Microcebus murinus was found in similar densities across all habitat types, while M. ravelobensis was found at much higher densities in dry forests compared with mangroves. This suggests that the generalist M. murinus uses a wider array of habitats more evenly than the specialist M. ravelobensis. Our study provides empirical evidence of how cryptic lemur species differ in their habitat use and distribution across an environmental gradient and provides new insights into their ecology in an understudied habitat. Lemurs are one of the most threatened groups of mammals in the world, and understanding how these species are distributed across different forest types is crucial for planning and implementing conservation measures to protect lemur habitat.
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Affiliation(s)
- Eric F Wuesthoff
- Department of Environmental Conservation, University of Massachusetts Amherst, Amherst, MA, USA
| | - Todd K Fuller
- Department of Environmental Conservation, University of Massachusetts Amherst, Amherst, MA, USA
| | - Christopher Sutherland
- Department of Environmental Conservation, University of Massachusetts Amherst, Amherst, MA, USA
- Centre for Research into Ecological and Environmental Modelling, University of St. Andrews, St. Andrews, Scotland, United Kingdom
| | - Jason M Kamilar
- Department of Anthropology, University of Massachusetts Amherst, Amherst, MA, USA
- Graduate Program in Organismic and Evolutionary Biology, University of Massachusetts Amherst, Amherst, MA, USA
| | | | - Romule Rakotondravony
- Faculté des Sciences, de Technologies et de l’Environnement, University of Mahajanga, 5 Rue Georges V - Immeuble KAKAL, Mahajanga Be, BP, Mahajanga, Madagascar
| | - Sarah Rouse
- School of Geography and the Environment, University of Oxford, Oxford, United Kingdom
| | - Ute Radespiel
- Institute of Zoology, University of Veterinary Medicine Hannover, Bünteweg, Hannover, Germany
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4
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Focardi S, Morgia VL, Montanaro P, Riga F, Calabrese A, Ronchi F, Aragno P, Scacco M, Calmanti R, Franzetti B. Reliable estimates of wild boar populations by nocturnal distance sampling. WILDLIFE BIOLOGY 2020. [DOI: 10.2981/wlb.00694] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Stefano Focardi
- S. Focardi ✉ , Istituto dei Sistemi Complessi, CNR, via Madonna del Piano 10, IT-50019 Sesto Fiorentino, Italy
| | - Valentina La Morgia
- V. La Morgia, P. Montanaro, F. Riga, A. Calabrese, F. Ronchi, P. Aragno, M. Scacco, R. Calmanti and B. Franzetti, Inst. Superiore per la Protezione e la Ricerca Ambientale, Ozzano dell' Emilia (BO), Italy
| | - Paolo Montanaro
- V. La Morgia, P. Montanaro, F. Riga, A. Calabrese, F. Ronchi, P. Aragno, M. Scacco, R. Calmanti and B. Franzetti, Inst. Superiore per la Protezione e la Ricerca Ambientale, Ozzano dell' Emilia (BO), Italy
| | - Francesco Riga
- V. La Morgia, P. Montanaro, F. Riga, A. Calabrese, F. Ronchi, P. Aragno, M. Scacco, R. Calmanti and B. Franzetti, Inst. Superiore per la Protezione e la Ricerca Ambientale, Ozzano dell' Emilia (BO), Italy
| | - Alessandro Calabrese
- V. La Morgia, P. Montanaro, F. Riga, A. Calabrese, F. Ronchi, P. Aragno, M. Scacco, R. Calmanti and B. Franzetti, Inst. Superiore per la Protezione e la Ricerca Ambientale, Ozzano dell' Emilia (BO), Italy
| | - Francesca Ronchi
- V. La Morgia, P. Montanaro, F. Riga, A. Calabrese, F. Ronchi, P. Aragno, M. Scacco, R. Calmanti and B. Franzetti, Inst. Superiore per la Protezione e la Ricerca Ambientale, Ozzano dell' Emilia (BO), Italy
| | - Paola Aragno
- V. La Morgia, P. Montanaro, F. Riga, A. Calabrese, F. Ronchi, P. Aragno, M. Scacco, R. Calmanti and B. Franzetti, Inst. Superiore per la Protezione e la Ricerca Ambientale, Ozzano dell' Emilia (BO), Italy
| | - Marianne Scacco
- V. La Morgia, P. Montanaro, F. Riga, A. Calabrese, F. Ronchi, P. Aragno, M. Scacco, R. Calmanti and B. Franzetti, Inst. Superiore per la Protezione e la Ricerca Ambientale, Ozzano dell' Emilia (BO), Italy
| | - Roberta Calmanti
- V. La Morgia, P. Montanaro, F. Riga, A. Calabrese, F. Ronchi, P. Aragno, M. Scacco, R. Calmanti and B. Franzetti, Inst. Superiore per la Protezione e la Ricerca Ambientale, Ozzano dell' Emilia (BO), Italy
| | - Barbara Franzetti
- V. La Morgia, P. Montanaro, F. Riga, A. Calabrese, F. Ronchi, P. Aragno, M. Scacco, R. Calmanti and B. Franzetti, Inst. Superiore per la Protezione e la Ricerca Ambientale, Ozzano dell' Emilia (BO), Italy
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5
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Croft S, Franzetti B, Gill R, Massei G. Too many wild boar? Modelling fertility control and culling to reduce wild boar numbers in isolated populations. PLoS One 2020; 15:e0238429. [PMID: 32946480 PMCID: PMC7500663 DOI: 10.1371/journal.pone.0238429] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 08/17/2020] [Indexed: 12/20/2022] Open
Abstract
Wild boar and feral swine number and range are increasing worldwide in parallel with their impact on biodiversity and human activities. The ecological and economic impact of this species include spread of diseases, vehicle collisions, damage to crops, amenities and infrastructures and reduction in plant and animal abundance and richness. As traditional methods such as culling have not contained the growth and spread of wild boar and feral pigs, alternative methods such as fertility control are now advocated. We used empirical data on two isolated wild boar populations to model and compare the effects of different regimes of culling and fertility control on population trends. We built a Bayesian population model and applied it to explore the implications for population control of various management options combining culling and/or contraception. The results showed that, whilst fertility control on its own was not sufficient to achieve the target reduction in wild boar number, adding fertility control to culling was more effective than culling alone. In particular, using contraceptives on 40% of the population to complement the culling of 60% of the animals, halved the time to achieve our target reduction compared with culling only. We conclude that, assuming the effort of adding fertility control to culling was found to be cost-effective in terms of population reduction, these two methods should be used simultaneously if a rapid decrease in wild boar number is required for a closed population.
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Affiliation(s)
- Simon Croft
- National Wildlife Management Centre, Animal and Plant Health Agency, York, United Kingdom
| | - Barbara Franzetti
- Institute for Environmental Protection and Research (ISPRA), Rome, Italy
| | - Robin Gill
- Centre for Ecosystems, Society and Biosecurity, Forest Research, Farnham, United Kingdom
| | - Giovanna Massei
- National Wildlife Management Centre, Animal and Plant Health Agency, York, United Kingdom
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6
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Fattorini N, Ferretti F. Estimating wild boar density and rooting activity in a Mediterranean protected area. Mamm Biol 2020. [DOI: 10.1007/s42991-020-00030-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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7
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Schlichting PE, Beasley JC, Boughton RK, Davis AJ, Pepin KM, Glow MP, Snow NP, Miller RS, VerCauteren KC, Lewis JS. A Rapid Population Assessment Method for Wild Pigs Using Baited Cameras at 3 Study Sites. WILDLIFE SOC B 2020. [DOI: 10.1002/wsb.1075] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Peter E. Schlichting
- College of Integrative Sciences and Arts Arizona State University Polytechnic Campus, 6073 S Backus Mall Mesa AZ 85212 USA
| | - James C. Beasley
- Savannah River Ecology Laboratory, Warnell School of Forestry and Natural Resources University of Georgia P.O. Drawer E Aiken SC 29802 USA
| | - Raoul K. Boughton
- University of Florida, Range Cattle Research and Education Center, Wildlife Ecology and Conservation 3401 Experiment Station Ona FL 33865 USA
| | - Amy J. Davis
- United States Department of Agriculture Animal and Plant Health Inspection Service, Wildlife Services, National Wildlife Research Center 4101 LaPorte Avenue Fort Collins CO 80521‐2154 USA
| | - Kim M. Pepin
- United States Department of Agriculture Animal and Plant Health Inspection Service, Wildlife Services, National Wildlife Research Center 4101 LaPorte Avenue Fort Collins CO 80521‐2154 USA
| | - Michael P. Glow
- United States Department of Agriculture Animal and Plant Health Inspection Service, Wildlife Services, National Wildlife Research Center 4101 LaPorte Avenue Fort Collins CO 80521‐2154 USA
| | - Nathan P. Snow
- United States Department of Agriculture Animal and Plant Health Inspection Service, Wildlife Services, National Wildlife Research Center 4101 LaPorte Avenue Fort Collins CO 80521‐2154 USA
| | - Ryan S. Miller
- United States Department of Agriculture Animal and Plant Health Inspection Service, Veterinary Services, Center for Epidemiology and Animal Health 2150B Center Avenue Fort Collins CO 80526 USA
| | - Kurt C. VerCauteren
- United States Department of Agriculture Animal and Plant Health Inspection Service, Wildlife Services, National Wildlife Research Center 4101 LaPorte Avenue Fort Collins CO 80521‐2154 USA
| | - Jesse S. Lewis
- College of Integrative Sciences and Arts, Arizona State University Polytechnic Campus, 6073 S Backus Mall Mesa AZ 85212 USA
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Engeman RM, Kaiser BW, Osorio KJ. Evaluating methods to detect and monitor populations of a large invasive lizard: the Argentine giant tegu. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:31717-31729. [PMID: 31485938 DOI: 10.1007/s11356-019-06324-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Accepted: 08/26/2019] [Indexed: 06/10/2023]
Abstract
The Argentine giant tegu, a large lizard native to South America, was first discovered as established in the USA in scrub habitats of west-central Florida in 2006. Invasive populations potentially could occupy an extensive range of habitats and in much of the southern United States and Mexico and threaten many native species. The Argentine giant tegu was recently deemed as having a "highest impact concern" among the invasive reptile species most threatening to Florida ecology. Among the most rewarding research directions identified for this species was "having a reliable and practical method to detect/monitor" them. We address this need by evaluating five methods for monitoring Argentine giant tegus on how well each method detected the species and whether the observations were sufficient to quantitatively assess population abundance using a widely applicable framework for indexing animal populations. Passive tracking plots were the most efficient and effective means for detecting tegus and calculating abundance indices but were best suited for late winter to spring before summer rains compacted tracking substrates. Gopher tortoise burrows are often used by tegus and camera traps on their entrances proved able to obtain data suitable for indexing populations but required more labor and expense than tracking plots. Trapping either at gopher tortoise burrows or along drift fences was ineffective at capturing tegus. Similarly, visual encounter transects were not effective for observing tegus.
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Affiliation(s)
- Richard M Engeman
- National Wildlife Research Center, 4101 LaPorte Avenue, Fort Collins, CO, 80521-2154, USA.
| | - Bernard W Kaiser
- Hillsborough Parks, Recreation and Conservation Department, 10940 McMullen Road, Riverview, FL, 33659, USA
| | - Kimberly J Osorio
- Hillsborough Parks, Recreation and Conservation Department, 10940 McMullen Road, Riverview, FL, 33659, USA
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9
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Graitson E, Barbraud C, Bonnet X. Catastrophic impact of wild boars: insufficient hunting pressure pushes snakes to the brink. Anim Conserv 2018. [DOI: 10.1111/acv.12447] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - C. Barbraud
- Centre d’études biologiques de Chizé UMR 7372 CNRS ULR Villiers en Bois France
| | - X. Bonnet
- Centre d’études biologiques de Chizé UMR 7372 CNRS ULR Villiers en Bois France
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10
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Keuling O, Sange M, Acevedo P, Podgorski T, Smith G, Scandura M, Apollonio M, Ferroglio E, Vicente J. Guidance on estimation of wild boar population abundance and density: methods, challenges, possibilities. ACTA ACUST UNITED AC 2018. [DOI: 10.2903/sp.efsa.2018.en-1449] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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11
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Massei G, Coats J, Lambert MS, Pietravalle S, Gill R, Cowan D. Camera traps and activity signs to estimate wild boar density and derive abundance indices. PEST MANAGEMENT SCIENCE 2018; 74:853-860. [PMID: 29024317 DOI: 10.1002/ps.4763] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2017] [Revised: 10/06/2017] [Accepted: 10/06/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Populations of wild boar and feral pigs are increasing worldwide, in parallel with their significant environmental and economic impact. Reliable methods of monitoring trends and estimating abundance are needed to measure the effects of interventions on population size. The main aims of this study, carried out in five English woodlands were: (i) to compare wild boar abundance indices obtained from camera trap surveys and from activity signs; and (ii) to assess the precision of density estimates in relation to different densities of camera traps. For each woodland, we calculated a passive activity index (PAI) based on camera trap surveys, rooting activity and wild boar trails on transects, and estimated absolute densities based on camera trap surveys. RESULTS PAIs obtained using different methods showed similar patterns. We found significant between-year differences in abundance of wild boar using PAIs based on camera trap surveys and on trails on transects, but not on signs of rooting on transects. The density of wild boar from camera trap surveys varied between 0.7 and 7 animals/km2 . Increasing the density of camera traps above nine per km2 did not increase the precision of the estimate of wild boar density. CONCLUSION PAIs based on number of wild boar trails and on camera trap data appear to be more sensitive to changes in population size than PAIs based on signs of rooting. For wild boar densities similar to those recorded in this study, nine camera traps per km2 are sufficient to estimate the mean density of wild boar. © 2017 Crown copyright. Pest Management Science © 2017 Society of Chemical Industry.
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Affiliation(s)
- Giovanna Massei
- National Wildlife Management Centre, Animal and Plant Health Agency, York, UK
| | - Julia Coats
- National Wildlife Management Centre, Animal and Plant Health Agency, York, UK
| | - Mark Simon Lambert
- National Wildlife Management Centre, Animal and Plant Health Agency, York, UK
| | | | - Robin Gill
- Centre for Ecosystems, Society and Biosecurity, Forest Research, Farnham, UK
| | - Dave Cowan
- National Wildlife Management Centre, Animal and Plant Health Agency, York, UK
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12
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Quantifying the bias in density estimated from distance sampling and camera trapping of unmarked individuals. Ecol Modell 2017. [DOI: 10.1016/j.ecolmodel.2017.02.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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13
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Uno H, Ueno M, Inatomi Y, Osa Y, Akashi N, Unno A, Minamino K. Estimation of Population Density for Sika Deer (Cervus nippon) Using Distance Sampling in the Forested Habitats of Hokkaido, Japan. MAMMAL STUDY 2017. [DOI: 10.3106/041.042.0107] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Hiroyuki Uno
- Nature Conservation Division, Institute of Environmental Sciences, Hokkaido Research Organization, Sapporo, Hokkaido 060-0819, Japan
| | - Mayumi Ueno
- Eastern Wildlife Research Station, Nature Conservation Division, Institute of Environmental Sciences, Hokkaido Research Organization, Kushiro, Hokkaido 085-8588, Japan
| | - Yoshihiro Inatomi
- Nature Conservation Division, Institute of Environmental Sciences, Hokkaido Research Organization, Sapporo, Hokkaido 060-0819, Japan
| | - Yuichi Osa
- Eastern Wildlife Research Station, Nature Conservation Division, Institute of Environmental Sciences, Hokkaido Research Organization, Kushiro, Hokkaido 085-8588, Japan
| | - Nobuhiro Akashi
- Forestry Research Institute, Hokkaido Research Organization, Bibai, Hokkaido 079-0198, Japan
| | - Akira Unno
- Forestry Research Institute, Hokkaido Research Organization, Bibai, Hokkaido 079-0198, Japan
| | - Kazuhiro Minamino
- Forestry Research Institute, Hokkaido Research Organization, Bibai, Hokkaido 079-0198, Japan
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Reproductive allocation in pulsed-resource environments: a comparative study in two populations of wild boar. Oecologia 2017; 183:1065-1076. [PMID: 28154966 DOI: 10.1007/s00442-017-3821-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Accepted: 01/13/2017] [Indexed: 10/20/2022]
Abstract
Pulsed resources influence the demography and evolution of consumer populations and, by cascading effect, the dynamics of the entire community. Mast seeding provides a case study for exploring the evolution of life history traits of consumers in fluctuating environments. Wild boar (Sus scrofa) population dynamics is related to seed availability (acorns/beechnuts). From a long-term monitoring of two populations subjected to markedly different environmental contexts (i.e., both low vs. high frequency of pulsed resources and low vs. high hunting pressure in Italy and in France, respectively), we assessed how pulsed resources shape the reproductive output of females. Using path analyses, we showed that in both populations, abundant seed availability increases body mass and both the absolute and the relative (to body mass) allocation to reproduction through higher fertility. In the Italian population, females equally relied on past and current resources for reproduction and ranked at an intermediate position along the capital-income continuum of breeding tactics. In contrast, in the French population, females relied on current more than past resources and ranked closer to the income end of the continuum. In the French population, one-year old females born in acorn-mast years were heavier and had larger litter size than females born in beechnut-mast years. In addition to the quantity, the type of resources (acorns/beechnuts) has to be accounted for to assess reliably how females allocate resources to reproduction. Our findings highlight a high plasticity in breeding tactics in wild boar females and provide new insight on allocation strategies in fluctuating environments.
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15
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Strindberg S, Coleman RA, Burns Perez VR, Campbell CL, Majil I, Gibson J. In-water assessments of sea turtles at Glover’s Reef Atoll, Belize. ENDANGER SPECIES RES 2016. [DOI: 10.3354/esr00765] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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16
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La Morgia V, Focardi S. Performance of distance sampling estimators: a simulation study for designs based on footpaths. J STAT COMPUT SIM 2016. [DOI: 10.1080/00949655.2016.1170128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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17
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Ferretti F, Fattorini L, Sforzi A, Pisani C. The use of faeces counts to estimate relative densities of wild boar in a Mediterranean area. POPUL ECOL 2016. [DOI: 10.1007/s10144-016-0536-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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18
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Wäber K, Dolman PM. Deer abundance estimation at landscape-scales in heterogeneous forests. Basic Appl Ecol 2015. [DOI: 10.1016/j.baae.2015.06.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Clements CF, Drake JM, Griffiths JI, Ozgul A. Factors influencing the detectability of early warning signals of population collapse. Am Nat 2015; 186:50-8. [PMID: 26098338 DOI: 10.1086/681573] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The recent description of potentially generic early warning signals is a promising development that may help conservationists to anticipate a population's collapse prior to its occurrence. So far, the majority of such warning signals documented have been in highly controlled laboratory systems or in theoretical models. Data from wild populations, however, are typically restricted both temporally and spatially due to limited monitoring resources and intrinsic ecological heterogeneity-limitations that may affect the detectability of generic early warning signals, as they add additional stochasticity to population abundance estimates. Consequently, spatial and temporal subsampling may serve to either muffle or magnify early warning signals. Using a combination of theoretical models and analysis of experimental data, we evaluate the extent to which statistical warning signs are robust to data corruption.
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Affiliation(s)
- Christopher F Clements
- Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich CH-8057, Switzerland
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20
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La Morgia V, Calmanti R, Calabrese A, Focardi S. Cost-effective nocturnal distance sampling for landscape monitoring of ungulate populations. EUR J WILDLIFE RES 2015. [DOI: 10.1007/s10344-014-0898-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Glass R, Forsyth DM, Coulson G, Festa-Bianchet M. Precision, accuracy and bias of walked line-transect distance sampling to estimate eastern grey kangaroo population size. WILDLIFE RESEARCH 2015. [DOI: 10.1071/wr15029] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Context
Distance sampling is widely used to estimate the size of wildlife populations, including kangaroos. However, the performance of distance-sampling abundance estimates has seldom been evaluated for wild mammal populations of known size.
Aims
We evaluated the precision, accuracy, bias and interval coverage of abundance estimates from walked line-transect sampling, a commonly used distance-sampling method, for a marked free-ranging population of eastern grey kangaroos (Macropus giganteus) at Yanakie Isthmus, Wilsons Promontory National Park, south-eastern Australia.
Methods
In each of two study periods (November 2012 and May 2013) we first determined the true size of the uniquely marked kangaroo population by conducting 10 intensive searches of the study area. We then conducted distance sampling along six systematically spaced line transects. We walked each transect four times in November 2012 and seven times in May 2013. Data were analysed using Program DISTANCE.
Key results
Our intensive searches revealed that 141 and 124 collared kangaroos were present in the study area in November 2012 and May 2013, respectively. When transects were walked four or more times (i.e. ≥400 observations), maximum precision (coefficient of variation; CV of ~13%) was achieved in both survey periods. Walking transects twice (i.e. ~200 observations) produced abundance estimates with CVs of <20% in each study period. The accuracy (root mean square error) of abundance estimates varied from 1 to 13 (November 2012) and from 3 to 28 (May 2013). Bias ranged from −9% to +23%, but stabilised at between −1% and −9% when transects were walked four or more times in each study period. The 95% confidence intervals for the abundance estimates always included the true population size.
Conclusions
Our results indicated that walked line-transect distance sampling is a precise and accurate method for estimating eastern grey kangaroo abundance. The small negative biases that occurred when sample sizes were large were likely to be due to some animals moving outside the study area.
Implications
Provided that the key design elements and assumptions are met, estimates of kangaroo abundance from walked line-transect distance sampling should have good precision (CV < 20%) and minimal (<10%) bias.
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Gamelon M, Focardi S, Gaillard JM, Gimenez O, Bonenfant C, Franzetti B, Choquet R, Ronchi F, Baubet E, Lemaître JF. Do age-specific survival patterns of wild boar fit current evolutionary theories of senescence? Evolution 2014; 68:3636-43. [DOI: 10.1111/evo.12519] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 08/12/2014] [Indexed: 01/11/2023]
Affiliation(s)
- Marlène Gamelon
- Department of Biology; Centre for Biodiversity Dynamics; Norwegian University of Science and Technology; N-7491 Trondheim Norway
| | - Stefano Focardi
- Istituto per i Sistemi Complessi; CNR; via Madonna del Piano 10 50019 Sesto Fiorentino Italy
| | - Jean-Michel Gaillard
- Université de Lyon, F-69000, Lyon; Université Lyon 1; CNRS, UMR 5558; Laboratoire de Biométrie et Biologie Évolutive; F-69622 Villeurbanne France
| | - Olivier Gimenez
- Centre d’Écologie Fonctionnelle et Évolutive; UMR 5175; Campus CNRS; 1919 route de Mende 34293 Montpellier Cedex 5 France
| | - Christophe Bonenfant
- Université de Lyon, F-69000, Lyon; Université Lyon 1; CNRS, UMR 5558; Laboratoire de Biométrie et Biologie Évolutive; F-69622 Villeurbanne France
| | - Barbara Franzetti
- Istituto Superiore per la Protezione e la Ricerca Ambientale; Via Ca’ Fornacetta 9 40064 Ozzano dell'Emilia Bologna Italy
| | - Rémi Choquet
- Centre d’Écologie Fonctionnelle et Évolutive; UMR 5175; Campus CNRS; 1919 route de Mende 34293 Montpellier Cedex 5 France
| | - Francesca Ronchi
- Istituto Superiore per la Protezione e la Ricerca Ambientale; Via Ca’ Fornacetta 9 40064 Ozzano dell'Emilia Bologna Italy
| | - Eric Baubet
- Office National de la Chasse et de la Faune Sauvage; 2 Bis Rue des Religieuses, BP 19 52120 Châteauvillain France
| | - Jean-François Lemaître
- Université de Lyon, F-69000, Lyon; Université Lyon 1; CNRS, UMR 5558; Laboratoire de Biométrie et Biologie Évolutive; F-69622 Villeurbanne France
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23
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Ferretti F, Storer K, Coats J, Massei G. Temporal and spatial patterns of defecation in wild boar. WILDLIFE SOC B 2014. [DOI: 10.1002/wsb.494] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Francesco Ferretti
- Research Unit of Behavioural Ecology; Ethology and Wildlife Management; Department of Life Sciences; University of Siena; Via P.A. Mattioli 4 53100 Siena Italy
- Maremma Regional Park Agency; Via del Bersagliere 7/9 58100 Alberese Grosseto Italy
| | - Kate Storer
- ADAS High Mowthorpe; Duggleby Malton North Yorkshire YO17 8BP UK
| | - Julia Coats
- National Wildlife Management Centre; Animal Health and Veterinary Laboratories Agency; Sand Hutton York YO26 5LE UK
| | - Giovanna Massei
- National Wildlife Management Centre; Animal Health and Veterinary Laboratories Agency; Sand Hutton York YO26 5LE UK
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Engeman RM, Massei G, Sage M, Gentle MN. Monitoring wild pig populations: a review of methods. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2013; 20:8077-8091. [PMID: 23881593 DOI: 10.1007/s11356-013-2002-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Accepted: 07/10/2013] [Indexed: 06/02/2023]
Abstract
Wild pigs (Sus scrofa) are widespread across many landscapes throughout the world and are considered to be an invasive pest to agriculture and the environment, or conversely a native or desired game species and resource for hunting. Wild pig population monitoring is often required for a variety of management or research objectives, and many methods and analyses for monitoring abundance are available. Here, we describe monitoring methods that have proven or potential applications to wild pig management. We describe the advantages and disadvantages of methods so that potential users can efficiently consider and identify the option(s) best suited to their combination of objectives, circumstances, and resources. This paper offers guidance to wildlife managers, researchers, and stakeholders considering population monitoring of wild pigs and will help ensure that they can fulfill their monitoring objectives while optimizing their use of resources.
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Affiliation(s)
- R M Engeman
- National Wildlife Research Center, 4101 LaPorte Ave, Fort Collins, CO, 80521-2154, USA,
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25
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Focardi S, Franzetti B, Ronchi F. Nocturnal distance sampling of a Mediterranean population of fallow deer is consistent with population projections. WILDLIFE RESEARCH 2013. [DOI: 10.1071/wr12218] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Context
Precise and accurate methods are essential to assess wildlife populations for sound management. We surveyed a managed population of fallow deer (Dama dama) in a Mediterranean environment in Italy, where this non-native ungulate has a negative impact on biodiversity.
Aims
We compare nocturnal distance-sampling (deer are detected by thermal imagery at night) population estimates with demographic projections of the same population.
Methods
We estimated natural survival in fawns (0.86), yearlings (0.83), adult males (0.70) and adult females (0.90) using capture–mark–recapture. By integrating survival estimates with population structure, reproductive traits and harvest data, we performed demographic projections. We performed nocturnal distance sampling on foot by using a thermal imagery once a year (in autumn) from 2001 to 2005. We walked 75–77 km (71 transects) per each survey.
Key results
We showed that our survey design met distance-sampling assumptions. Distance sampling and demographic projections yielded similar and precise (12.6% < CV <24.1%) population estimates, showing a decreasing (–164.64 deer year–1) population trend from 2755 deer in 2001 to 1877 in 2005.
Conclusions
We showed that nocturnal distance sampling is useful to monitor wild deer populations in forests effectively and that it represents a cost-effective tool to develop sounded management policy for this non-native species. We also provided, for the first time, a comprehensive stochastic population model for fallow deer in a Mediterranean environment. Using these population estimates, managers could reduce fallow deer population size to a level compatible with the conservation of the endangered Italian roe deer and improve forest regeneration.
Implications
Nocturnal distance sampling can be used to assess ungulate population living in dense forested habitats effectively and efficiently.
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