Article

J. Dananjaya Kottawa-Arachchi, PhD, Research Officer in Plant Breeding Division at Tea Research Institute of Sri Lanka (Talawakelle, Sri Lanka); e-mail: jeevan1188@yahoo.com
R. Samantha Gunasekara, Lanka Nature Conservationists (209/3 Anagarika Dharmapala Mawatha, Dehiwela, Sri Lanka).

Kottawa-Arachchi J.D., Gunasekara R.S. 2020. Research priorities and future directions in conservation of wild orchids in Sri Lanka: a review. Nature Conservation Research 5(Suppl.1): 34–45. https://dx.doi.org/10.24189/ncr.2020.029

Together with Western Ghats, Sri Lanka is a biodiversity hotspot amongst the 35 regions known worldwide. Considering the Sri Lankan orchids, 70.6% of the orchid species, including 84% of the endemics, are categorised as threatened. The distribution of the family Orchidaceae is mostly correlated with the distribution pattern of the main bioclimatic zones which is governed by the amount and intensity of rainfall and altitude. Habitat deterioration and degradation, clearing of vegetation, intentional forest fires and spread of invasive alien species are significant threats to native species. Illegally collection and exporting of indigenous species has been another alarming issue in the past decades. Protection of native species, increased public awareness, enforcement of legislation and introduction of new propagation techniques would certainly bring a beneficial effect to the native orchid flora. Conduct awareness programs, strengthen existing laws, and reviewing the legal framework related to the native orchid flora could be vital for future conservation. Apart from the identification of new species and their distribution, future research on understanding soil chemical and physical parameters of terrestrial habitats, plant association of terrestrial orchids, phenology patterns and interactions of pollinators, associations with mycorrhiza, effect of invasive alien species and impact of climate change species are highlighted.

awareness, biodiversity conservation, climate change, illegal exploitation, threatened species

Received: 24.03.2020. Revised: 22.05.2020. Accepted: 29.05.2020.

Acharya K.P., Vetaas O.R., Birks H.J.B. 2011. Orchid species richness along Himalayan elevational gradients. Journal of Biogeography 38(9): 1821–1833. DOI: 10.1111/j.1365-2699.2011.02511.x
Akhalkatsi M., Arabuli G., Lorenz R. 2014. Orchids as indicator species of forest disturbances on limestone quarry in Georgia (South Caucasus). Journal Europäischer Orchideen 46(1): 123–160.
Anonymous. 1937. Fauna and Flora Protection Ordinance, No. 02. Sri Lanka: Government Press. 46 p.
Anonymous. 1993. Fauna and Flora Protection Act (Amendment), No. 49. Sri Lanka: Government Press. 55 p.
Anonymous. 2009. Fauna and Flora Protection Act (Amendment), No. 22. Sri Lanka: Government Press. 80 p.
Ashton P.S. 2003. Floristic zonation of tree communities on wet tropical mountains revisited. Perspectives in Plant Ecology, Evolution and Systematics 6(1–2): 87–104. DOI: 10.1078/1433-8319-00044
Bandara C., Priyankara T., Atthanagoda A.G., Lakkana T., Ediriweera S., Kumar P. 2020. Gastrodia gunatillekeorum (Gastrodieae, Epidendroideae, Orchidaceae), a new species from a lowland rainforest of Sri Lanka. Phytotaxa 436(1): 55–62. DOI: 10.11646/phytotaxa.436.1.5
Barman D., Devadas R. 2013. Climate change on orchid population and conservation strategies: A review. Journal of Crop and Weed 9(2): 1–12.
Bowles M., Zettler L., Bell T., Kelsey P. 2005. Relationships between soil characteristics, distribution and restoration potential of the federal threatened eastern prairie fringed orchid, Platanthera leucophaea (Nutt.) Lindl. American Midland Naturalist 154(2): 273–285. DOI: 10.1674/0003-0031(2005)154[0273:RBSCDA]2.0.CO;2
Chase M.W., Cameron K.M., Freudenstein J.V, Pridgeon A.M., Salazar G., van den Berg C., Schuiteman A. 2015. An updated classification of Orchidaceae. Botanical Journal of the Linnean Society 177(2): 151–174. DOI: 10.1111/boj.12234
Cribb P. J., Kell S.P., Dixon K.W., Barrett R.L. 2003. Orchid conservation: a global perspective. In: Orchid Conservation. Kota Kinabalu, Sabah: Natural History Pub. P. 1–4.
Djordjević V., Tsiftsis S., Lakušić D., Jovanović S. 2016. Factors affecting the distribution and abundance of orchids in grasslands and herbaceous wetlands grasslands and herbaceous wetlands. Systematics and Biodiversity 14(4): 355–370. DOI: 10.1080/14772000.2016.1151468
Fay M.F. 2018. Orchid conservation: how can we meet the challenges in the twenty-first century? Botanical Studies 59(16): 16. DOI: 10.1186/s40529-018-0232-z
Fernando M., Wijesundara S., Fernando S. 2003. Orchids of Sri Lanka. A conservationist's companion. A simplified guide to identification. Vol. 1: The protected orchids and selected similar species. Colombo: IUCN Sri Lanka. 147 p.
Fernando R.H.S. 2012. Present status of family Orchidaceous in Sri Lanka. In D.K. Weerakoon, S. Wijesundara (Eds.): The National Red List 2012 of Sri Lanka: Conservation Status of the Fauna and Flora. Colombo, Sri Lanka: Ministry of Environment. P. 200–204.
Fernando S.S. 2013. Distribution and habitat selection of threatened Orchids of Sri Lanka. In: 11^th Asia Pacific Orchid Conference in Okinawa, Japan. Okinawa, Japan. P. 103–108.
Fernando S.S., Ormerod P. 2008. An annotated checklist of the Orchids of Sri Lanka. Rheedea 18(1): 1–28.
Fernando S.S., Gunatilleke I.A.U.N., Gunasekara S., Gunatilleke C.V.S., Abewardana U.T.I. 2008. Phalaenopsis mysorensis Saldanha (Orchidaceae): Note on distribution and ecology. Ceylon Journal of Science (Biological Sciences) 37(2): 163–166. DOI: 10.4038/cjsbs.v37i2.503
Gunasekara R.S. 2016. Flower polymorphism of naturally occurring Vanda tessellata in Sri Lanka. In: Proceedings of the Wayamba University International Conference. Sri Lanka. P. 242.
Gunasekara R.S., Wijesundara D.S.A. 2008. Investigation of the relationship between floral diversity and the reproductive success of Vanda tessellata (Roxb.) Hook. Colombo, Sri Lanka: Department of Wild Life Conservation.
Gunasekara R.S., Yakandawala K., Jayakody S., Wijesundara D.S.A. 2019a. Orchid trade in Sri Lanka with special reference to Vanda tessellata. In: International Symposium of Global Dialogue on Wildlife Trafficking. Sri Lanka: University of Colombo. P. 4.
Gunasekara R.S., Yakandawala K., Jayakody S., Wijesundara D.S.A. 2019b. A case study on Vanda tessellata (Roxb) Hook. ex G. Don trade in Sri Lanka. In: International Scientific Symposium of Association for Tropical Biology and Conservation (ATBC): Asia-Pacific Chapter. Sri Lanka. P. 163.
Gunawardene N.R., Daniels D.A., Gunatilleke I.A.U.N., Gunatilleke C.V.S., Karunakaran P.V., Nayak G.K., Vasanthy G. 2007. A brief overview of the Western Ghats-Sri Lanka biodiversity hotspot. Current Science 93(11): 1567–1572.
Hinsley A., De Boer H.J., Fay M.F., Gale S.W., Gardiner L.M., Gunasekara R.S., Kumar P., Masters S., Metusala D., Roberts D.L., Veldman S., Wong S., Phelps J. 2018. A Review of the Trade in Orchids and Its Implications for Conservation. Botanical Journal of the Linnean Society 186(4): 435–55. DOI:10.1093/botlinnean/box083
Jayasumana C., Gunatilake S., Senanayake P. 2014. Glyphosate, hard water and nephrotoxic metals: are they the culprits behind the epidemic of chronic kidney disease of unknown etiology in Sri Lanka? International Journal of Environmental Research and Public Health 11(2): 2125–2147. DOI: 10.3390/ijerph110202125
Jayaweera D.M.A. 1981. Orchidaceae. In: M.D. Dassanayake, F.R. Fosberg (Eds.): A Revised handbook to the flora of Ceylon. Vol. 2. New Delhi, India: Amerind Publication Co. Pvt. Ltd. P. 4–387.
Kelly C., Pickering C.M., Buckley R.C. 2003. Impacts of tourism on threatened plant taxa and communities in Australia. Ecological Restoration and Management 4(1): 37–44. DOI: 10.1046/j.1442-8903.2003.00136.x
Khapugin A.A. 2020. A global systematic review on orchid data in protected areas. Nature Conservation Research 5(Suppl.1): 19–33. DOI: 10.24189/ncr.2020.019
Khapugin A.A., Chugunov G.G., Vargot E.V. 2017. Cypripedium calceolus ( Orchidaceae ) in Central Russia : a case study for its populations in two protected areas in the Republic of Mordovia (Russia). Lankesteriana 17(3): 417–431. DOI: 10.15517/lank.v17i3.31577
Khapugin A.A., Silaeva T.B., Semchuk A.A., Kunaeva E.N. 2016. Populations of Orchis militaris L ., Epipactis palustris ( L.) Crantz and Malaxis monophyllos ( L.) Sw. in the Republic of Mordovia ( Central Russia ). Biodiversity Research and Conservation 42: 33–40. DOI: 10.1515/biorc-2016-0012
Kolanowska M., Kras M., Lipińska M., Mystkowska K., Szlachetko D.L., Naczk A.M. 2017. Global warming not so harmful for all plants-response of holomycotrophic orchid species for the future climate change. Scientific Reports 7(1): 12704. DOI: 10.1038/s41598-017-13088-7
Kotagama S.W., Bambaradeniya C.N.B. 2006. An overview of the wetlands of Sri Lanka and their conservation significance. In: National Wetland Directory of Sri Lanka. Colombo, Sri Lanka: IUCN Sri Lanka and Central Environmental Authority. P. 7–16.
Kottawa-Arachchi J.D. 2017. Biodiversity in central highland wetlands, a world heritage site in Sri Lanka. In: A.K.B. Prusty, R. Chandra, P.A. Azeez (Eds.): Wetland Science: Perspectives From South Asia. New Delhi: Springer. P. 67–85. DOI: 10.1007/978-81-322-3715-0_4
Kottawa-Arachchi J.D., Liyanage M.G.S., Karunarathne H.K.B.M.I., Abeyweera N.H.A.S., Kulasinghe B.Y.M., Kahawandala K.R.S.C.B. 2020. The endangered Daffodil Orchid Ipsea speciosa (L.) (Orchidaceae): Population status in unprotected areas in the Central Highlands, Sri Lanka. Lankesteriana 20(1): 79–90. DOI: 10.15517/lank.v20i1.41434
Kottawa-Arachchi J.D., Wijeratne M.A. 2017. Climate change impacts on biodiversity and ecosystems in Sri Lanka: a review. Nature Conservation Research 2(3): 2–22. DOI: 10.24189/ncr.2017.042
Kuebbing S.E., Nunez M.A. 2016. Invasive non-native plants have a greater effect on neighbouring natives than other non-natives. Nature Plants 2: 16134. DOI: 10.1038/nplants.2016.134
Kumari D., Fernando K., Wijesundara S. 2006. Mass propagation and conservation of Daffodil Orchid (Ipsea speciosa): An endangered endemic orchid. In: Proceedings of the Third Academic Sessions. Sri Lanka: University of Ruhuna. P. 44–49.
Landi M., Frignani F., Lazzeri C., Angiolini C. 2009. Abundance of Orchids on calcareous grasslands in relation to community species, environmental, and vegetational conditions. Russian Journal of Ecology 40(7): 486–494. DOI: 10.1134/S1067413609070066
McCormick M.K., Jacquemyn H. 2014. What constrains the distribution of orchid populations? New Phytologist 202(2): 392–400. DOI: 10.1111/nph.12639
MOE. 2010. Biodiversity and ecosystem services: Sector vulnerability profile. In Strengthening Capacity for Climate Change Adaptation: ADB TA 7326 (SRI). Sri Lanka: Ministry of Environment; Climate Change Secretariat. P. 1–90.
MOE. 2012. The National Red List 2012 of Sri Lanka; Conservation status of the fauna and flora. Colombo, Sri Lanka: Ministry of Environment. 451 p.
MOFE. 1999. Biodiversity Conservation in Sri Lanka: A Framework for Action. Colombo, Sri Lanka: Ministry of Forestry and Environment. P. 1–126.
Mohotti K.M., Amarasena P.G.D.S. 2013. Microbial activity different tea soils in Sri Lanka as affected by soil pesticides. In: Proceedings of the National Symposium on Soil Biodiversity. Sri Lanka: Ministry of Environment and Renewable Energy. P. 167–170.
Myers N., Mittermeier R.A., Mittermeier C.G., da Fonseca G.A.B., Kent J. 2000. Biodiversity hotspots for conservation priorities. Nature 403(6772): 853–858. DOI: 10.1038/35002501
Otero J.T., Flanagan N.S. 2006. Orchid diversity – beyond deception. Trends in Ecology and Evolution 21(2): 64–65. DOI: 10.1016/j.tree.2005.11.016
Pethiyagoda R. 1994. Threats to the indigenous freshwater fishes of Sri Lanka and remarks on their conservation. Hydrobiologia 285(1–3): 189–201. DOI: 10.1007/BF00005666
Priyadarshana T.S., Wijewardhane I.H., Atthanagoda A.G., Arangala N.S., Jayasooriya A., Kumar P. 2017. Oberonia meegaskumburae (Orchidaceae: Epidendroideae: Malaxideae), a new species from Sri Lanka. Phytotaxa 302(3): 259–265. DOI: 10.11646/phytotaxa.302.3.5
Priyadarshana T.S., Atthanagoda A.G., Wijewardhane I.H., Siriweera K.S., Abeyrathna N., Kumar P. 2019. Pteroceras dalaputtuwa (Orchidaceae: Epidendroideae: Vandeae: Aeridinae), a new species from Sri Lanka and re-collection of Pteroceras viridiflorum after 150 years. Phytotaxa 399(1): 65–76. DOI: 10.11646/phytotaxa.399.1.7
Priyadarshana T.S., Atthanagoda A.G., Wijewardhane I.H., Aberathna N., Peabotuwage I., Kumar P. 2020. Dendrobium taprobanium (Orchidaceae): a new species from Sri Lanka with taxonomic notes on some species of the genus. Phytotaxa 432(1): 81–94. DOI: 10.11646/phytotaxa.432.1.7
Rasmussen H.N., Rasmussen F.N. 2009. Orchid mycorrhiza: Implications of a mycophagous life style. Oikos 118(3): 334–345. DOI: 10.1111/j.1600-0706.2008.17116.x
Shashidhar K.S., Kumar A.N.A. 2009. Effect of climate change on orchids and their conservation strategies. The Indian Forester 8: 1039–1049.
Su Y.Y., Meng Y., Shi Y., Tang G.D., Liu Z.J. 2014. Liparis funingensis (Orchidaceae; Epidendroideae; Malaxidae), a new species from Yunnan, China: Evidence from morphology and DNA. Phytotaxa 166(1): 85–93. DOI: 10.11646/phytotaxa.166.1.6
Swarts N.D., Dixon K.W. 2009. Terrestrial orchid conservation in the age of extinction. Annals of Botany 104(3): 543–556. DOI: 10.1093/aob/mcp025
Teoh E.S. 2005. Sympodial orchids. In: Orchids of Asia. Singapore: Marshall Cavendish International (Asia) Pvt. Ltd. P. 41–150.
Teoh E.S. 2016. Sources of medicianl orchids and conservation. In: Medicinal orchids of Asia. Switzerland: Springer International Publishing AG. P. 691–722.
Tsiftsis S., Tsiripidis I., Karagiannakidou V., Alifragis D. 2008. Niche analysis and conservation of the orchids of east Macedonia (NE Greece). Acta Oecologica 33(1): 27–35. DOI: 10.1016/j.actao.2007.08.001
UNESCO. 2010. Central Highlands of Sri Lanka. Report of the decisions adopted by the World Heritage Committee at its 34^th session. WHC-10/34.COM/20.
Valuiskikh O.E., Teteryuk L.V. 2013. Structure and dynamics of marginal Gymnadenia conopsea (L.) R. Br. (Orchidaceae) populations on limestones in the northeast of European Russia. Russian Journal of Ecology 44(6): 461–467. DOI: 10.1134/S1067413613060106
Vilà M., Espinar J.L., Hejda M., Hulme P.E., Jarošík V., Maron J.L., Pergl J., Schaffner U., Sun Y., Pyšek P. 2011. Ecological impacts of invasive alien plants: a meta-analysis of their effects on species, communities and ecosystems. Ecology Letters 14(7): 702–708. DOI: 10.1111/j.1461-0248.2011.01628.x
Walther G., Post E., Convey P., Menzel A., Parmesan C., Beebee T.J.C., Fromentin J., Hoegh-Guldberg O., Bairlein F. 2002. Ecological responses to recent climate change. Nature 416(6879): 389–395. DOI: 10.1038/416389a
Wijewardana I.H., Priyadarshana T.S., Arangala N.S., Atthanagoda A.G., Samarakoon R.T.B., Kumar P. 2016. Podochilus warnagalensis (Orchidaceae), a new species from Sri Lanka. Phytotaxa 266(2): 151–156. DOI: 10.11646/phytotaxa.266.2.10
Wijesundara S. 2012. Present status of montane forests in Sri Lanka. In: D.K. Weerakoon, S. Wijesundara (Eds.): The National Red List 2012 of Sri Lanka: Conservation Status of the Fauna and Flora. Colombo, Sri Lanka: Ministry of Environment. P. 181–185.
Xu Q., Zhang G.Q., Liu Z.J., Luo Y.B. 2014. Two new species of dendrobium (Orchidaceae: Epidendroideae) from China: Evidence from morphology and DNA. Phytotaxa 174(3): 129–143. DOI: 10.11646/phytotaxa.174.3.1
Youssef S., Galalaey A., Mahmood M., Mahdi H., Véla E. 2019. Wild orchids of the Kurdistan Region areas: a scientific window on the unexpected nature of the North-Western Zagros. France: Société Méditerranéenne d'Orchidologie. P. 1–84.
Zhang S.B., Chen W.Y., Huang J.L., Bi Y.F., Yang X.F. 2015. Orchid species richness along elevational and environmental gradients in Yunnan, China. PLoS ONE 10(11): e0142621. DOI: 10.1371/journal.pone.0142621