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Macgregor LF, Greenlees M, de Bruyn M, Shine R. An invasion in slow motion: the spread of invasive cane toads (Rhinella marina) into cooler climates in southern Australia. Biol Invasions 2021. [DOI: 10.1007/s10530-021-02597-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Vimercati G, Kruger N, Secondi J. Land cover, individual's age and spatial sorting shape landscape resistance in the invasive frog Xenopus laevis. J Anim Ecol 2021; 90:1177-1190. [PMID: 33608946 DOI: 10.1111/1365-2656.13445] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 01/25/2021] [Indexed: 11/30/2022]
Abstract
The description of functional connectivity is based on the quantification of landscape resistance, which represents species-specific movement costs across landscape features. Connectivity models use these costs to identify movement corridors at both individual and population levels and provide management recommendations for populations of conservation interest. Typically, resistance costs assigned to specific land cover types are assumed to be valid for all individuals of the population. Little attention has been paid to intraspecific variation in resistance costs due to age or dispersal syndrome, which may significantly affect model predictions. We quantified resistance costs in an expanding invasive population of the African clawed frog Xenopus laevis in Western France. In this principally aquatic amphibian, juveniles, sub-adults and adults disperse overland. The enhancement of dispersal traits via spatial sorting has been also observed at the range periphery of the population. Resistance costs, and thus connectivity, might vary as a function of life stage and position within the invaded range. We assessed multiple dimensions of functional connectivity. On various land cover types, we measured locomotion, as crossing speed, in different post-metamorphic age classes, and dehydration, sensitivity of locomotion to dehydration and substrate preference in juveniles. We also tested the effect of the position in the invaded range (core vs. periphery) on individual performances. In juveniles, general trends towards higher resistance costs on grass and lower resistance costs on bare soil and asphalt were observed, although not all experiments provided the same cost configurations. Resistance to locomotion varied between age classes, with adults and sub-adults facing lower costs than juveniles, particularly when crossing structurally complex land cover types such as grass and leaf litter. The position in the range had a minor effect on landscape resistance, and only in the dehydration experiment, where water loss in juveniles was lower at the range periphery. Depicting functional connectivity requires (a) assessing multiple dimensions of behavioural and physiological challenges faced by animals during movement; (b) considering factors, such as age and dispersal syndrome, that may affect movement at both individual and population levels. Ignoring this complexity might generate unreliable connectivity models and provide unsupported management recommendations for conservation.
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Affiliation(s)
| | - Natasha Kruger
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR5023 LEHNA, Villeurbanne, France.,Centre for Invasion Biology, Stellenbosch University, Stellenbosch, South Africa
| | - Jean Secondi
- Faculté des Sciences, Université d'Angers, Angers, France.,Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR5023 LEHNA, Villeurbanne, France
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Dickey JWE, Cuthbert RN, South J, Britton JR, Caffrey J, Chang X, Crane K, Coughlan NE, Fadaei E, Farnsworth KD, Ismar-Rebitz SMH, Joyce PWS, Julius M, Laverty C, Lucy FE, MacIsaac HJ, McCard M, McGlade CLO, Reid N, Ricciardi A, Wasserman RJ, Weyl OLF, Dick JTA. On the RIP: using Relative Impact Potential to assess the ecological impacts of invasive alien species. NEOBIOTA 2020. [DOI: 10.3897/neobiota.55.49547] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Invasive alien species continue to arrive in new locations with no abatement in rate, and thus greater predictive powers surrounding their ecological impacts are required. In particular, we need improved means of quantifying the ecological impacts of new invasive species under different contexts. Here, we develop a suite of metrics based upon the novel Relative Impact Potential (RIP) metric, combining the functional response (consumer per capita effect), with proxies for the numerical response (consumer population response), providing quantification of invasive species ecological impact. These metrics are comparative in relation to the eco-evolutionary baseline of trophically analogous natives, as well as other invasive species and across multiple populations. Crucially, the metrics also reveal how impacts of invasive species change under abiotic and biotic contexts. While studies focused solely on functional responses have been successful in predictive invasion ecology, RIP retains these advantages while adding vital other predictive elements, principally consumer abundance. RIP can also be combined with propagule pressure to quantify overall invasion risk. By highlighting functional response and numerical response proxies, we outline a user-friendly method for assessing the impacts of invaders of all trophic levels and taxonomic groups. We apply the metric to impact assessment in the face of climate change by taking account of both changing predator consumption rates and prey reproduction rates. We proceed to outline the application of RIP to assess biotic resistance against incoming invasive species, the effect of evolution on invasive species impacts, application to interspecific competition, changing spatio-temporal patterns of invasion, and how RIP can inform biological control. We propose that RIP provides scientists and practitioners with a user-friendly, customisable and, crucially, powerful technique to inform invasive species policy and management.
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Merwin AC. Flight capacity increases then declines from the core to the margins of an invasive species' range. Biol Lett 2019; 15:20190496. [PMID: 31744412 DOI: 10.1098/rsbl.2019.0496] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Individuals that disperse farther than other individuals are more likely to be on the frontlines of spreading populations and may be more likely to mate with one another as a consequence of their spatial proximity. Over generations, this process-known as spatial sorting-can produce patterns of increasing dispersal ability from a population's core towards the spreading front. By contrast, when the spread of a population is limited by the availability of suitable habitat, theory predicts that range boundaries can select against more dispersive phenotypes and produce patterns of decreasing dispersal capacity towards population margins. In a common garden study of invasive kudzu bugs (Megacopta cribraria)-which are limited by the availability of hostplants in their southern and western margins-I show that midrange individuals fly 49% farther than individuals in the core and 37% farther than individuals at margins. This result highlights that other processes, such as maternal effects or selection at range boundaries, may create more complicated patterns of dispersal ability across landscapes than predicted by models of spatial sorting alone.
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Affiliation(s)
- Andrew C Merwin
- Biology and Geology, Baldwin Wallace University, Berea, OH, USA
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Moore HA, Dunlop JA, Valentine LE, Woinarski JCZ, Ritchie EG, Watson DM, Nimmo DG. Topographic ruggedness and rainfall mediate geographic range contraction of a threatened marsupial predator. DIVERS DISTRIB 2019. [DOI: 10.1111/ddi.12982] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Affiliation(s)
- Harry A. Moore
- School of Environmental Science, Institute for Land, Water and Society Charles Sturt University Albury NSW Australia
| | - Judy A. Dunlop
- Science and Conservation Division, Department of Biodiversity, Conservation and Attractions Kensington WA Australia
| | - Leonie E. Valentine
- School of Biological Sciences University of Western Australia, Crawley WA Australia
| | - John C. Z. Woinarski
- Threatened Species Recovery Hub National Environmental Science Program, Charles Darwin University Darwin NT Australia
| | - Euan G. Ritchie
- Centre for Integrative Ecology and School of Life and Environmental Sciences Deakin University Burwood VIC Australia
| | - David M. Watson
- School of Environmental Science, Institute for Land, Water and Society Charles Sturt University Albury NSW Australia
| | - Dale G. Nimmo
- School of Environmental Science, Institute for Land, Water and Society Charles Sturt University Albury NSW Australia
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Gregg EA, Tingley R, Phillips BL. The on‐ground feasibility of a waterless barrier to stop the spread of invasive cane toads in Western Australia. CONSERVATION SCIENCE AND PRACTICE 2019. [DOI: 10.1111/csp2.74] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Affiliation(s)
- Emily A. Gregg
- School of BioSciencesThe University of Melbourne Parkville Victoria Australia
| | - Reid Tingley
- School of BioSciencesThe University of Melbourne Parkville Victoria Australia
- School of Biological SciencesMonash University Clayton Victoria Australia
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Clarke GS, Shine R, Phillips BL. May the (selective) force be with you: Spatial sorting and natural selection exert opposing forces on limb length in an invasive amphibian. J Evol Biol 2019; 32:994-1001. [DOI: 10.1111/jeb.13504] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 06/06/2019] [Accepted: 06/20/2019] [Indexed: 01/03/2023]
Affiliation(s)
- Gregory S. Clarke
- School of Life and Environmental Sciences University of Sydney Sydney NSW Australia
| | - Richard Shine
- School of Life and Environmental Sciences University of Sydney Sydney NSW Australia
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Tingley R, Ward-Fear G, Schwarzkopf L, Greenlees MJ, Phillips BL, Brown G, Clulow S, Webb J, Capon R, Sheppard A, Strive T, Tizard M, Shine R. New Weapons in the Toad Toolkit: A Review of Methods to Control and Mitigate the Biodiversity Impacts of Invasive Cane Toads (Rhinella Marina). QUARTERLY REVIEW OF BIOLOGY 2018; 92:123-49. [PMID: 29562120 DOI: 10.1086/692167] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Our best hope of developing innovative methods to combat invasive species is likely to come from the study of high-profile invaders that have attracted intensive research not only into control, but also basic biology. Here we illustrate that point by reviewing current thinking about novel ways to control one of the world’s most well-studied invasions: that of the cane toad in Australia. Recently developed methods for population suppression include more effective traps based on the toad’s acoustic and pheromonal biology. New tools for containing spread include surveillance technologies (e.g., eDNA sampling and automated call detectors), as well as landscape-level barriers that exploit the toad’s vulnerability to desiccation—a strategy that could be significantly enhanced through the introduction of sedentary, range-core genotypes ahead of the invasion front. New methods to reduce the ecological impacts of toads include conditioned taste aversion in free-ranging predators, gene banking, and targeted gene flow. Lastly, recent advances in gene editing and gene drive technology hold the promise of modifying toad phenotypes in ways that may facilitate control or buffer impact. Synergies between these approaches hold great promise for novel and more effective means to combat the toad invasion and its consequent impacts on biodiversity.
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Shine R. Biological Invasions and Animal BehaviourBiological Invasions and Animal Behaviour. J. S. Weis and D. Sol (Eds.). 2016. Cambridge University Press. ISBN 9781107077775. 353 pp. $215.—. COPEIA 2017. [DOI: 10.1643/ot-17-649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- Richard Shine
- School of Life and Environmental Sciences, University of Sydney, NSW 2006 Australia
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Inderjit, Catford JA, Kalisz S, Simberloff D, Wardle DA. A framework for understanding human‐driven vegetation change. OIKOS 2017. [DOI: 10.1111/oik.04587] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Inderjit
- Dept of Environmental Studies Centre for Environmental Management of Degraded Ecosystems (CEMDE), Univ. of Delhi Delhi India
| | - Jane A. Catford
- Biological Sciences Univ. of Southampton, Southampton, UK, and: School of BioSciences, The Univ. of Melbourne Victoria Australia
| | - Susan Kalisz
- Dept of Ecology and Evolutionary Biology Univ. of Tennessee Knoxville TN USA
| | - Daniel Simberloff
- Dept of Ecology and Evolutionary Biology Univ. of Tennessee Knoxville TN USA
| | - David A. Wardle
- Dept of Forest Ecology and Management Swedish Univ. of Agricultural Sciences Umeå Sweden
- Asian School of the Environment, Nanyang Technological Univ. Singapore
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