Abstract
Focusing on extreme climatic events in India’s Western Ghats Biodiversity Hotspot, we demonstrate that unmanaged aquaculture and unregulated fisheries can often combine with ECE in exacerbating biological invasions through the unexpected introduction and escape of novel alien species. High magnitude flooding events in August 2018 and 2019 resulted in the escape of at least ten alien fish species that were recorded for the first time, from the natural waters of the Western Ghats. Illegal farming systems, aqua-tourism destinations and amusement parks, as well as reservoirs, facilitated the escape of alien species during the ECE. Despite expanding invasions, unmanaged stocking and aquaculture using alien species continue in the Western Ghats, necessitating urgent management and policy interventions.
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References
Anonymous (2018) Rebuild Kerala Development Programme: A Resilient Recovery Policy Framework and Action Plan for Shaping Kerala’s Resilient, Risk-Informed Development and Recovery from 2018 Floods. Rebuild Kerala Initiative, Government of Kerala, India, 355pp. https://rebuild.kerala.gov.in/reports/RKDP_Master%2021May2019.pdf
Arun LK (1999) Patterns and processes of fish assemblage in periyar lake–valley system of Southern Western Ghats. KFRI Research Report, Kerala Forest Research Institute, Peechi, Kerala, India, p 142
Bijukumar A (2000) Exotic fishes and freshwater fish diversity. Zoos Print J 15:363–367
Bijukumar A (2019) Survey and mapping of exotic freshwater biodiversity in Kerala using Geographic Information System. Final Project Report submitted to the Directorate of Environment and Climate Change, Government of Kerala, India.
Bijukumar A, Smrithy R, Sureshkumar U, George S (2015) Invasion of South American suckermouth armoured catfishes Pterygoplichthys spp. (Loricariidae) in Kerala, India–a case study. J Threat Taxa 7:6987–6995
Bijukumar A, Raj S, Arjun CP, Katwate U, Raghavan R (2019) Jurassic invaders: flood-associated occurrence of arapaima and alligator gar in the rivers of Kerala. Curr Sci 116:1628–1630
Cincotta RP, Wisnewski J, Engelman R (2000) Human population in the biodiversity hotspots. Nature 404(6781):990–992
Dahanukar N, Raghavan R (2013) Checklist of the freshwater fishes of Western Ghats. MIN Newsletter of the IUCN SSC/WI Freshwater Fish Specialist Group—South Asia, 1, 6–16
Dahanukar N, Raghavan R, Ali A, Abraham A, Shaji CP (2011) The status and distribution of fishes of the Western Ghats. In: Molur, S., Smith, K.G., Daniel, B.A. and Darwall, W.R.T. (Compilers). The Status and Distribution of Freshwater Biodiversity in the Western Ghats, India. Cambridge, UK and Gland, Switzerland: IUCN, and Coimbatore, India: Zoo Outreach Organisation
Darwall WR, Freyhof J (2015) Lost fishes, who is counting? The extent of the threat to freshwater fish biodiversity. In: Closs GP, Krkosek M, Olden JD (eds) Conservation of freshwater fishes. Cambridge University Press, Cambridge, pp 1–35
Death RG, Fuller IC, Macklin MG (2015) Resetting the river template: the potential for climate-related extreme floods to transform river geomorphology and ecology. Freshw Biol 60:2477–2496. https://doi.org/10.1111/fwb.12639
Diez JM, D’Antonio CM, Dukes JS et al (2012) Will extreme climatic events facilitate biological invasions? Front Ecol Env 10:249–257. https://doi.org/10.1890/110137
Durance I, Ormerod SJ (2009) Trends in water quality and discharge confound long-term warming effects on river macroinvertebrates. Freshw Biol 54:388–405. https://doi.org/10.1111/j.1365-2427.2008.02112.x
Elton CS (1958) The ecology of invasions by animals and plants. Methuen, London, UK
Hunt KMR, Menon A (2020) The 2018 Kerala floods: a climate change perspective. Clim Dynam 54:2433–2446. https://doi.org/10.1007/s00382-020-05123-7
IPCC (2014) Climate Change 2014: Synthesis Report. Contribution of Working Groups I, II and III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change [Core Writing Team, R.K. Pachauri and L.A. Meyer (eds.)]. IPCC, Geneva, Switzerland, 151 pp
IUCN Red List of Threatened Species (2019). www.iucnredlist.org accessed on 10th March 2020.
Jeschke JM, Starzer J (2018) Propagule Pressure Hypothesis. In: Jeschke JM, Heger T (eds) Invasion biology: hypotheses and evidence. CAB International, Wallingford, pp 147–156
Khan FM, Panikkar P (2009) Assessment of impacts of invasive fishes on the food web structure and ecosystem properties of a tropical reservoir in India. Ecol Model 220:2281–2290. https://doi.org/10.1016/j.ecolmodel.2009.05.020
Kitanishi S, Yamamoto T (2015) The effects of severe flooding on native masu salmon and non-native rainbow trout in the Atsuta River, Hokkaido, Japan. J Fresh Ecol 30:589–596. https://doi.org/10.1080/02705060.2015.1015058
Kottelat M, Whitten T (1996) Freshwater biodiversity in Asia with special reference to fish. World Bank Technical Paper 343, Washington, USA
Krishnakumar K, Raghavan R, Prasad G, Bijukumar A, Sekharan M, Pereira B, Ali A (2009) When pets become pests–exotic aquarium fishes and biological invasions in Kerala, India. Curr Sci 97:474–476
Light T, Moyle P (2016). Assembly rules and novel assemblages in aquatic ecosystems. In: Canning-Clode J (ed) Biological Invasions in Changing Ecosystems Vectors, Ecological Impacts, Management and Predictions. De Gruyter Open Ltd, Warsaw/Berlin.
Lima Junior DP, Magalhães ALB, Pelicice FM, Vitule JRS, Azevedo-Santos VM, Orsi ML, Simberloff D, Agostinho AA (2018) Aquaculture expansion in Brazilian freshwaters against the Aichi biodiversity targets. Ambio 47(4):427–440. https://doi.org/10.1007/s13280-017-1001-z
Milner AM, Robertson AL, McDermott MJ, Klaar MJ, Brown LE (2012) Major flood disturbance alters river ecosystem evolution. Nat Clim Change 3:137–141. https://doi.org/10.1038/nclimate1665
Molur S, Raghavan R (2015) Prioritizing freshwater fish conservation in Western Ghats Hotspot: Alliance for Zero Extinction (AZE) sites. In: Bignoli DF, Bhatt S, Park S, Eassom S, Belle EMS, Murti R, Buyck C, Raza-Rizvi A, Rao M, Lewis E, MacSharry B, Kingston A (ed) Asia Protected Planet Report 2014 Publisher: UNEP-WCMC, Cambridge, UK.
Moyle PB, Light T (1996) Biological invasions of fresh water: emperical rules and assembly theory. Biol Conserv 78:149–161. https://doi.org/10.1016/0006-3207(96)00024-9
Moyle PB, Marchetti MP (2006) Predicting invasion success: freshwater fishes in California as a model. BioSci 56:515–524. https://doi.org/10.1641/0006-3568(2006)56[515:PISFFI]2.0.CO;2
Padma TV (2018) Kerala floods made worse by mining and dams. Nature 561:13–14
Raghavan R, Prasad G, Anvar-Ali PH et al (2008) Exotic fish species in a global biodiversity hotspot: observations from River Chalakudy, part of Western Ghats, Kerala, India. Biol Invasions 10:37–40. https://doi.org/10.1007/s10530-007-9104-2
Raghavan R, Dahanukar N, Tlusty MF et al (2013) Uncovering an obscure trade: Threatened freshwater fishes and the aquarium pet markets. Biol Cons 164:158–169. https://doi.org/10.1016/j.biocon.2013.04.019
Raj S, Kumar AB, Raghavan R, Dahanukar N (2020) Amazonian invaders in an Asian biodiversity hotspot: understanding demographics for the management of the armoured sailfin catfish, Pterygoplichthys pardalis in Kerala, India. J Fish Biol 96:549–553. https://doi.org/10.1111/jfb.14243
Raj S, Devi S, Salam S, Bijukumar A (2021) Food spectrum of two co-occurring invasive fish, Cyprinus carpio Linnaeus, 1758 and Clarias gariepinus (Burchell, 1822) in Mattupetty reservoir, Kerala, India. Indian J Fish 68(2) (In Press)
Reid AJ, Carlson AK, Creed IF et al (2019) Emerging threats and persistent conservation challenges for freshwater biodiversity. Biol Rev 94:849–873. https://doi.org/10.1111/brv.12480
Rizzo A, Bresciani R, Masi F, Boano F, Revelli R, Ridolfi L (2018) Flood reduction as an ecosystem service of constructed wetlands for combined sewer overflow. J Hydrol 560:150–159. https://doi.org/10.1016/j.jhydrol.2018.03.020
Sandilyan S, Meenakumari B, Babu CR, Mandal R (2018) Invasive alien species of India. National Biodiversity Authority, Chennai, p 85
Shi H, Singh A, Kant S, Zhu Z, Waller E (2005) Integrating habitat status, human population pressure, and protection status into biodiversity conservation priority setting. Conserv Biol 19(4):1273–1285. https://doi.org/10.1111/j.1523-1739.2005.00225.x
Simberloff D, Von Holle B (1999) Positive interactions of nonindigenous species: invasional meltdown? Biol Invasions 1:21–32. https://doi.org/10.1023/A:1010086329619
Sugunan VV (1995) Reservoir fisheries of India. FAO Fisheries Technical Paper. No. 345. Rome, FAO. 423 pp
Woodward G, Perkins DM, Brown LE (2010) Climate change and freshwater ecosystems:impacts across multiple levels of organization. Phil Trans R Soc B 365:2093–2106. https://doi.org/10.1098/rstb.2010.0055
Acknowledgements
Smrithy Raj and A. Bijukumar thanks the Directorate of Environment and Climate Change (DoECC), Government of Kerala, India for funding. Rajeev Raghavan thanks the Kerala State Biodiversity Board (KSBB) for funding. Smrithy Raj is funded by the Rajiv Gandhi National Fellowship, Government of India. Two anonymous reviewers, and the assistant editor provided useful comments and suggestions that greatly improved earlier versions of the manuscript.
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Raj, S., Kumar, A.B., Tharian, J. et al. Illegal and unmanaged aquaculture, unregulated fisheries and extreme climatic events combine to trigger invasions in a global biodiversity hotspot. Biol Invasions 23, 2373–2380 (2021). https://doi.org/10.1007/s10530-021-02525-4
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DOI: https://doi.org/10.1007/s10530-021-02525-4