Abstract
Globally, invasive species, climate change and increasing tourism are currently recognised as the three most significant threats to Outstanding Universal Values of natural World Heritage listed Areas. This study investigated the threat of incursion of invasive plant species associated with access roads in the Wet Tropics World Heritage Area in Queensland, Australia. We assessed species richness, abundance, and the spread of non-native plant species along roads and in the adjacent vegetation using 306 1m2 quadrats along 34 transects first sampled in 2015 and resampled in 2021. Plant species and vegetation cover of all ground-layer plants were recorded. Thirty-one non-native plant species were recorded, and their richness was found to be significantly higher at the road edge (27 species) than in the adjacent vegetation (16 species). Non-native plant species richness and cover decreased with distance from the road edge, in contrast to that of native plants which showed an increase. Many significant associations were detected including those between non-native plant cover, non-native species richness, native plant cover, plant litter cover, forest canopy cover, bare ground, rock and stones cover, and time since last fire (P < 0.05). Vegetation cover for more than 73% of the recorded non-native species at the road edge was < 5%. The large number of non-native species and the potential for a small set of these species to dominate the road edge and spread into the adjoining environment, highlights the need to mitigate the impacts of linear infrastructure development in protected areas, and the importance of timely surveillance and targeted control of non-native plants at road edges to avoid their spread into the adjacent vegetation.
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Data availability
The datasets generated during the current study are available from the corresponding author on reasonable request.
References
Ansong M, Pickering C (2013) Are weeds hitchhiking a ride on your car? A systematic review of seed dispersal on cars. PLoS ONE 8:1–11
Aththanayaka CP, Siyasinghe DP, Prakash SL et al (2022) Native and exotic plant invasions vary across habitat types and anthropogenic disturbances in a tourism-heavy protected area. Biol Invasions 25:411–429. https://doi.org/10.1007/s10530-022-02923-2
Bertzky B, Shi Y, Hughes A, et al (2013) Terrestrial biodiversity and the world heritage list
BOM (2022) Climate data online. In: Bur. Meteorol. http://www.bom.gov.au/climate/data/. Accessed 29 Mar 2022
Boston K (2016) The potential effects of forest roads on the environment and mitigating their impacts. Curr for Reports 2:215–222. https://doi.org/10.1007/s40725-016-0044-x
Brisbane city council (2022a) Giant parramatta grass. In: Weeds. https://weeds.brisbane.qld.gov.au/weeds/giant-parramatta-grass. Accessed 21 Oct 2022
Brooks ML, D’Antonio CM, Richardson DM et al (2004) Effects of invasive alien plants on fire regimes. Bioscience 54:677–688. https://doi.org/10.1641/0006-3568(2004)054[0677:EOIAPO]2.0.CO;2
Carmody J, Murphy H, Catterall C, et al (2015) The importance of protecting and conserving the wet tropics. Synthesis of nerp tropical ecosystems hub tropical rainforest research outputs 2011–2014
Brisbane city council (2022b) Signal grass. In: weeds. https://weeds.brisbane.qld.gov.au/weeds/signal-grass
DASSET (1986) Nomination of the Wet tropical rainforests of north-east australia by the government of Australia for inclusion in the world heritage list
Department of agriculture and fisheries (2016) Invasive plants (Weeds). https://www.daf.qld.gov.au/business-priorities/biosecurity/invasive-plants-animals/plants-weeds. Accessed 18 Mar 2022
Department of environment and science Queensland (2020) Queensland state of the environment 2020 summary
Duggin JA, Gentle CB (1998) Experimental evidence on the importance of disturbance intensity for invasion of Lantana camara L. in dry rainforest±open forest ecotones in north–eastern NSW. Australia Ecol Manag 109:279–292
Fischer AJ, Ramirez HV, Gibson KD, Da Silveira PB (2001) Competitiveness of semidwarf upland rice cultivars against palisadegrass (brachiaria brizantha) and signalgrass (b. decumbens). Agron J 93:967–973. https://doi.org/10.2134/agronj2001.935967x
Fisher A, Scarth P, Armston J, Danaher T (2018) Relating foliage and crown projective cover in Australian tree stands. Agric for Meteorol 259:39–47. https://doi.org/10.1016/j.agrformet.2018.04.016
Foxcroft LC, Richardson DM, Rejmanek M, Pysek P (2010) Alien plant invasions in tropical and sub-tropical savannas: patterns, processes and prospects. Biol Invasions 12:3913–3933
Foxcroft LC, Pyšek P, Richardson DM, Genovesi P (2013) Invasive alien plants in protected areas: threats, opportunities, and the way forward. Plant invasions in protected areas: patterns, problems and challenges. Invading N. Springer Science+Business Media, Dordrecht, pp 621–639
Goosem MW, Turton SM (2006) Weed incursions along roads and powerlines in the wet tropics world heritage area. Cairns
Goosem S (2008) Invasive weeds in the wet tropics. In: Stork NE, Turton SM (eds) Blackwell Publishing Ltd. Carlton, Australia, pp 307–321
Gotelli NJ, Colwell RK (2011) Estimating species richness. In: Magurran AE, McGill BJ (eds) Biological diversity: frontiers in measurement and assessment. Oxford University Press, New York, pp 39–54
Grice AC, Setter MJ (2003) Weeds of rainforests and associated ecosystems
Halpern AM, Frye SL, Marzzacco CJ (2018) Scientific data analysis toolkit: a versatile add-in to microsoft excel for windows. J Chem Educ 95:1063–1068. https://doi.org/10.1021/acs.jchemed.8b00084
Queensland Herbarium (2021) Regional ecosystem description database (REDD). https://apps.des.qld.gov.au/regional-ecosystems/. Accessed 25 Mar 2022
Hogan KFE, Fogarty DT, Ellerman H et al (2022) Rangelands in a fragmented grass-dominated landscape are vulnerable to tree invasion from roadsides. Biol Invasions 24:3341–3347. https://doi.org/10.1007/s10530-022-02869-5
IUCN (2020a) Wet tropics of Queensland. https://worldheritageoutlook.iucn.org/explore-sites/wdpaid/17757. Accessed 23 Mar 2022
IUCN (2020b) Wet tropics of Queensland 2020 Conservation outlook assessment 2020 conservation outlook
Keet JH, Datta A, Foxcroft LC et al (2022) Assessing the level of compliance with alien plant regulations in a large African protected area. Biol Invasions 24:3831–3844. https://doi.org/10.1007/s10530-022-02883-7
Keith DA (2017) Australian vegetation. Cambridge University Press, Melbourne, Australia, Third
Kudo Y, Mutaqien Z, Simbolon H, Suzuki E (2014) Spread of invasive plants along trails in two national parks in West Java, Indonesia. Tropics 23:99–110. https://doi.org/10.3759/tropics.23.99
Laidlaw MJ (2022) Introduction to the census of the Queensland flora 2022. Brisbane
Le C, Fukumori K, Hosaka T et al (2018) The distribution of an invasive species, clidemia hirta along roads and trails in endau rompin national park, Malaysia. Trop Conserv Sci 11:1–9. https://doi.org/10.1177/1940082917752818
Liedtke R, Barros A, Essl F et al (2020) Hiking trails as conduits for the spread of non-native species in mountain areas. Biol Invasions 22:1121–1134. https://doi.org/10.1007/s10530-019-02165-9
Lisboa SN, Domingos F, Vallius E et al (2022) Assessing the impact of road and land use on species diversity of trees, shrubs, herbs and grasses in the mountain landscape in southern Africa. Front Conserv Sci 1:1. https://doi.org/10.3389/fcosc.2022.829690
Lusk CH, Kelly JWG, Gleason SM (2013) Light requirements of Australian tropical vs. cool-temperate rainforest tree species show different relationships with seedling growth and functional traits. Ann Bot 111:479–488. https://doi.org/10.1093/aob/mcs289
Matsuo T, Martínez-Ramos M, Bongers F et al (2021) Forest structure drives changes in light heterogeneity during tropical secondary forest succession. J Ecol 109:2871–2884. https://doi.org/10.1111/1365-2745.13680
McDougall KL, Lembrechts J, Rew LJ et al (2018) Running off the road: roadside non-native plants invading mountain vegetation. Biol Invasions 20:3461–3473. https://doi.org/10.1007/s10530-018-1787-z
Neldner VJ, Kirkwood AB, Collyer BS (2004) Optimum time for sampling floristic diversity in tropical eucalypt woodlands of northern Queensland. Rangel J 26:190–203
Ngugi MR, Neldner VJ (2017) Assessing the invasion threat of non-native plant species in protected areas using Herbarium specimen and ecological survey data. A case study in two rangeland bioregions in Queensland. Rangel J 39:85–95. https://doi.org/10.1071/RJ16076
Ngugi MR, Neldner VJ, Dowling R (2014) Non-native plant species richness adjacent to a horse trail network in seven national parks in southeast Queensland, Australia. Australas J Environ Manag 21:413–428. https://doi.org/10.1080/14486563.2014.952788
Osunkoya OO, Perrett C, Fernando C et al (2013) Modeling population growth and site specific control of the invasive Lantana camara L. (Verbenaceae) under differing fire regimes. Popul Ecol 55:291–303. https://doi.org/10.1007/s10144-013-0364-7
Osunkoya OO, Froese JG, Nicol S et al (2019) A risk-based inventory of invasive plant species of Queensland, Australia: regional, ecological and floristic insights. Austral Ecol 44:1123–1138. https://doi.org/10.1111/aec.12776
Osunkoya OO, Lock CB, Dhileepan K, Buru JC (2021) Lag times and invasion dynamics of established and emerging weeds: insights from herbarium records of Queensland, Australia. Biol Invasions 23:3383–3408. https://doi.org/10.1007/s10530-021-02581-w
Potito AP, Beatty SW (2005) Impacts of recreation trails on exotic and ruderal species distribution in grassland areas along the Colorado front range. Environ Manag 36:230–236. https://doi.org/10.1007/s00267-003-0177-0
Pyšek P, Jarošík V, Hulme PE et al (2012) A global assessment of invasive plant impacts on resident species, communities and ecosystems: the interaction of impact measures, invading species’ traits and environment. Glob Chang Biol 18:1725–1737. https://doi.org/10.1111/j.1365-2486.2011.02636.x
Biosecurity Qld (2014) Biosecurity act 2014
QPWS (2013) Danbulla national park management statement 2013. Cairns
QPWS (2015) Herberton range regional park management statement
QPWS (2021a) Wet Tropics. In: World Herit. Area. https://parks.des.qld.gov.au/management/managed-areas/world-heritage-areas/current/wet-tropics. Accessed 23 Mar 2022
QPWS (2021b) Fire history—Queensland parks and wildlife service. In: Qldspatial Inf. https://www.data.qld.gov.au/dataset/fire-history-queensland-parks-and-wildlife-service/resource/658e1e88-e828-4868-9837-e3d2d5bc610a. Accessed 18 Mar 2022
Biosecurity Queensland (2020) Lantana. Brisbane
Roovers P, Baeten S, Hermy M (2004) Plant species variation across path ecotones in a variety of common vegetation types. Plant Ecol 170:107–119. https://doi.org/10.1023/B:VEGE.0000019028.89623.26
Seipel T, Kueffer C, Rew LJ et al (2012) Processes at multiple scales affect richness and similarity of non-native plant species in mountains around the world. Glob Ecol Biogeogr 21:236–246. https://doi.org/10.1111/j.1466-8238.2011.00664.x
Tironi SP, Galon L, Silva AA et al (2016) Nível de dano econômico de braquiária sobre cultivares de cana-de-açúcar. Planta Daninha 34:649–656. https://doi.org/10.1590/S0100-83582016340400004
Tracey JG (1982) The vegetation of the humid tropical region of north Queensland. CSIRO, Melbourne, Australia
UNESCO (2022) Threatened paradise. In: Nat. World Herit. Nature’s Most precious Gift. to Humanit. https://whc.unesco.org/en/natural-world-heritage/#threatened-paradise. Accessed 28 Oct 2022
United Nations (1992) Convention on biological diversity, article 8(h)
Wet Tropics management authority (2004) The conservation, rehabilitation, and transmission to future generations of the wet tropics world heritage area. Wet Tropics Management Authority, Cairns
Wet tropics management authority (2023) Wet tropics world heritage area facts and figures. https://www.wettropics.gov.au/world-heritage-area-facts-and-figures.html. Accessed 15 Jan 2024
Zouhar K, Smith JK, Sutherland S (2008) Chapter 2: Effects of fire on nonnative invasive plants and invasibility of wildland ecosystems. USDA For Serv Gen Tech Rep RMRS-GTR-42 6:7
Acknowledgements
This study was funded by the Department of Environment and Science. Field site establishment assistance provided by Mark Newton, Queensland Tropical Herbarium, Cairns and logistics assistance provided by Queensland Parks and Wildlife Service &Partnership (QPWS&P) staff in Atherton is acknowledged. Fire history data provided by Robert Miller QPWS&P Mareeba, map preparation and GIS assistance provided by Jiaorong Li and data management provided by William Dodt at Queensland Herbarium and Biodiversity Science (QHBS) and Keenan Williams (student at Griffith University) are gratefully acknowledged. Peer review and comments provided by Andrew Millerd, Program Director Performance, Improvement and Change at Atherton (QPWS&P) and Dr Eda Addicott and Dr Melinda Laidlaw (QHBS), and data analyses assistance using PRIMER and SPSS provided by Dr Olusegun Osunkoya Queensland Department of Agriculture and Fisheries are gratefully acknowledged. Authors gratefully acknowledge valuable comments and suggestions provided by two anonymous referees and the handling Editor Dr Anzar Khuroo that have greatly helped to improve the revised manuscript.
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This study was funded by the Department of Environment and Science, Queensland government.
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Both authors contributed to the study conception and design. Material preparation and data collection was performed by both authors, and analysis were performed by Dr Michael Ngugi. The first draft of the manuscript was written by Dr Michael Ngugi. Dr John Neldner edited, enhanced, and commented on all previous versions of the manuscript. Both authors read and approved the final manuscript.
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Ngugi, M.R., Neldner, V.J. Assessing the incursion status of non-native plant species in the Wet Tropics World Heritage Area in Queensland, Australia. Biol Invasions 26, 1471–1487 (2024). https://doi.org/10.1007/s10530-024-03260-2
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DOI: https://doi.org/10.1007/s10530-024-03260-2