ISSN 0971-8656 Seshaiyana ANNAMALAI UNIVERSITY Quarterly newsletter of ENVIS on Indian estuaries, mangroves, coral reefs and lagoons Sponsored by Ministry of Environment, Forests and Climate Change, Government of India Volume 23 Issue 2 Second quarter (July-Sep.), 2015 Soft coral belonging to family Nephtheidae ENVIS CENTRE CENTRE OF ADVANCED STUDY IN MARINE BIOLOGY FACULTY OF MARINE SCIENCES ANNAMALAI UNIVERSITY E-mail: [email protected] Website: <http://casmbenvis.nic.in> Seshaiyana Quarterly newsletter of ENVIS on Indian estuaries, mangroves, coral reefs and lagoons Volume 23 Issue 2 Editors Prof. K. Kathiresan (Dean, Director & ENVIS In-Charge) Prof. S. Ajmal Khan Prof. P.S. Lyla ENVIS Team Dr. S. Manokaran: Research Officer Mrs. L. Vijayalakshmi: Assistant Programmer Mr. B. Senthilkumar: Information Assistant Mr. A. Subramanian: Reprography Assistant Mr. R. Nagarajan: Office Assistant Faculty Team Prof. N. Veerappan Prof. M. Srinivasan Prof. A. Shanmugam Dr. P. Sampathkumar, Associate Professor Dr. P. Anantharaman, Associate Professor Dr. G. Ananthan, Assistant Professor Dr. K. Sivakumar, Assistant Professor Sponsored by Ministry of Environment, Forests & Climate Change Government of India, New Delhi Disclaimer Authors are solely responsible for the scientific facts and copyright permissions if they have reproduced materials or quoted lines from other sources. They are also responsible for the publication of the same in the past or in the future. Dear Readers, Second quarter (July-Sep.), 2015 ISSN 0971-8656 Instructions to Authors We welcome research and popular articles, notes, news, snippets and cartoons or any scientific information on our core subjects—estuaries, mangroves, coral reefs and lagoons in and around Indian waters. The articles should not exceed five typed pages in double space. Figures should be clear for good reproduction. References should be limited and cited in the text by name and year. Council of Science Editors Style may be referred to for listing references at the end. E-mail your articles in MS Word 2003 or 2007 to: [email protected] or send both the hard and soft copies to: ENVIS In-Charge Centre of Advanced Study in Marine Biology Faculty of Marine Sciences Parangipettai - 608 502 Tamil Nadu, India We invite comments, suggestions and constructive criticism on Seshaiyana from the authors and readers. CONTENTS Question raised in Lok Sabha on conservation and management of mangroves ZSI monitoring impact of climate change on Sundarban biota A mission for coastal resource conservation Occurrence of Indian Peafowl (Pavo cristatus) in Parangipettai coastal area Eco-sensitive zone tag for Bhitarkanika villages Developing El Niño could be the strongest on record Travelling fish market in Pulicat lagoon Sustainability: do not waste bycatch Rising to the challenge of Whale shark conservation 1 2 3 4 5 6 8 8 back page Editor’s Desk This issue is packed with good information on the coastal biodiversity of India. Sundarban mangroves is a UNESCO World Heritage site and has more than a hundred islands. The first article reports the impact of climate change on flora and fauna of the mangroves. It has extensive mangrove areas harbouring endangered species such as Royal Bengal Tiger and Ganges and Irawadi dolphins. The Zoological Survey of India (ZSI) and Botanical Survey of India (BSI) which carried out this study set up 25 plots to monitor the impact. Besides the above there are three more articles on the conservation of mangroves in India. The second article which is an outcome of a query raised in the Lok Sabha of India regarding the conservation and management of mangroves, deals with scheme of conservation and management of mangroves and implementation of the management action plan in all the states and Union Territories. The other two articles deal with the conservation of mangroves in Sorlagondi, Andhra Pradesh and Bhitarkanika, Odisha. The next article brings to our attention the occurrence of Indian Peafowl in the coastal area of Parangipettai where an artificially developed mangrove forest, aquaculture farms and salt pans are having rich food resources such as fishes, crabs, insects and molluscs besides invertebrates present in the sediments for this wading bird. The sixth article presses the alarm bell regarding the consequences of El Niño in the Pacific and Indian Ocean countries. It also points out its fall out in India during the monsoon season. The seventh article informs us about the unique travelling fish market operating in the Pulicat lagoon. Here fishes are sold fresh. The last article focusing on the sustainability of bycacth resources explains the opportunities existing in the utilization of the resources through way of preparation of calcium carbonate, chitin and protein products for use in pharmaceutical, chemical and fertilizer industries. We request all the readers to contribute popular articles to Seshaiyana (in the theme area of coastal and marine biodiversity). We invite your comments and valuable feedbacks for improving the contents of the newsletter. Editors Question Raised in Lok Sabha on Conservation and Management of Mangroves A question was raised in Lok Sabha on conservation and management of mangroves Artificially developed mangroves on 28/07/2015. The Ministry of Environment, Forest and Climate Change provided the following answer. The ministry has a Centrally Sponsored Scheme (CSS) for C o n s e r va t i o n a n d M a n a g e m e n t o f Mangroves of India. Under the Scheme, the Ministry provides 100% Central Assistance to coastal States/Union Territories for 'Core Activities' and 'Ancillary Activities' in the ratio of 80:20. The ministry also requests forest departments for implementation of the Management Action Plans (MAPs). The components of the MAPs comprise of such activities as Survey and Demarcation, Afforestation and Restoration of Mangroves, Alternate and Supplementary Livelihoods, Protection Measures, Education and Awareness etc. On a nation-wide basis, 38 sites in all the coastal States / Union Territories have been identified as appropriate for planting mangroves besides their conservation and management. The ministry added that the progress of the scheme was quite satisfactory. Source: http://www.indiaenvironmentportal.org.in/content/415602/question-raised-in-lok-sabha-onconservation-and-management-of-mangroves-28072015/ Sea Walnut (Mnemiopsis leidyi) Ctenophore ( Mnemiopsis leidyi ) Seshaiyana, 23(2): 2015 This ctenophore (a stingless jellyfish-like animal) is native to the east coast of North and South America. In 1982, it was discovered in the Black Sea, where it was transported through ballast water. It subsequently spread to the Caspian Sea. In both places it multiplied and formed immense populations. The sea walnuts contributed to the collapse of local fisheries as they feed on zooplankton on which the commercial fish also feed. It has also been discovered in the Mediterranean, Baltic, and North Seas. Source: http://ocean.si.edu/oceanphotos/sea-walnut-mnemiopsis-leidyi 1 ZSI Monitoring Impact of Climate Change on Sundarban Biota To measure the effect of climate change on the flora and fauna of Sundarbans, the Zoological Survey of India has set up monitoring bases inside the mangrove forests. There are 25 plots in the five islands of Bali, Gosaba, Basanti, Sagar and Satjelia where the bases have been set up to measure the diversity and population index of mangroves, crabs and snails. Any change in their population will reveal how climate change is affecting the islands. We will know to what extent the biodiversity is getting affected due to change in the water salinity level and other factors. It will also take photographs and prepare a GPS map of their habitats. It will prepare a Sundarban mangroves baseline data of biodiversity. As time passes by it will be able to know whether there is any change in the flora and fauna of the region or not. The monitoring bases have so far been established in the buffer zone of the mangrove forest. It has taken permission from the state forest department to start more such centres inside the core area of the tiger reserve. A UNESCO World Heritage site, Sundarbans is an archipelago of more than a hundred islands, famous for its mangrove forests and several endangered species like the Royal Bengal Tiger, Ganges and Irawadi dolphins. The islands are hit hard by constant land erosion and salinity due to rising sea levels. The ZSI is monitoring the impact on animals while the Botanical Survey of India will monitor the flora. Under a project funded by the Union Ministry of Environment, Forests and Climate Change, they have also started monitoring insect pollination on eight major mangrove species of the region. As a result of various factors including the use of chemical pesticides, climate change, pollution, etc, the number of pollinators has been on a decline in many parts of the world. A number of fruits, nuts and vegetables are pollinated by bees. Conservation of pollinators is important from the view point of food security and protection of our forests. Source: http://timesofindia.indiatimes. com/home/environment/flora-fauna/ZSImonitoring-climate-change-impact-onSundarban-animals/ articleshow/47907468.cms Emperor Penguins on the Ice Standing at twice the height of the Adélie penguins, emperor penguins are the largest of the penguin species and can grow to be 100 pounds. This species breeds directly on the ice: a female lays her one egg and then passes it to the male to protect while she returns to the cold water to forage for food. Source: http://ocean.si.edu/ocean-photos/ emperor-penguins-ice 2 Emperor Penguins Seshaiyana, 23(2): 2015 A Mission for Coastal Resource Conservation Artificially developed mangroves The United Nations Framework Convention on Climate Change (UNFCCC) and the Chennai-based M.S. Swaminathan Research Foundation (MSSRF) will work together for the conservation of coastal resources with focus on the restoration of the Sorlagondi mangrove forest cover in Krishna district. The UNFCCC has sanctioned Rs. 3.8 crore for implementing the adaptation strategy of MSSRF in Krishna district from an 'adaptation fund' through the National Bank for Agriculture and Rural Development (NABARD). According to NABARD sources, the objective of the adaptation initiative is to overcome the consequences of sea level rise and seawater inundation following cyclonic storms. A roadmap to improve the mangrove forest cover in 200 acres and fish cultivation in around 50 acres of mangrove forest was prepared, and executed in August. It was also stated that cage cultivation would be encouraged in brackish water by setting up as many as 10 cages in the three villages which had been adopted by MSSRF. The conservation of the mangrove forest becomes significant, as a portion of it has been spared for the proposed Missile Test Launch Facility project of the Defence Research and Development Organisation. Source: http://www.thehindu.com/todayspaper/tp-national/tp-telangana/a-mission-for-coastalresource-conservation/article7571475.ece Seaweed Collector Wins Environment Award Ms. M. Lakshmi (46) was hardly seven years old when she took her maiden boat ride to the islands in the Gulf of Mannar to collect seaweeds. She has come a long way to win the prestigious Seacology Prize. She is going to Berkeley in California to receive the award. The US-based Seacology, an environment non-profit organisation has selected Ms. Lakshmi for this year's award for her outstanding contribution in conserving the marine resources and cultural traditions of her village, Chinnapalam, a small coastal hamlet in the island. Vineeta Hoon, a Seacology representative in Chennai, who had shortlisted Lakshmi's name, said she was the first Indian woman and community leader to win the award, which Seaweed cultivator who won the Seacology carried $ 10,000 and a trophy with her name inscribed on it. Ms. Lakshmi, who never went to school, took to seaweed collection at the very young age and had been in the profession for nearly four decades supplementing her family income. She often regretted for not having gone to school but it looks it is a blessing in disguise. She is heading the Gulf of Mannar seaweed collect women forum, the women's wing of the Ramanathapuram district fish workers trade union, which has proposed her name for the award in coordination with Vembar based People's Action for Development and International Collective in Support of Fish Workers. About 2,000 women are engaged in seaweed collection, both in the Palk Bay and Gulf of Mannar. Lakshmi is guiding them in sustainable collection. Source: http://www.thehindu.com/news/national /tamil-nadu/seaweed-collector-wins-environmentaward/article7613833.ece Seshaiyana, 23(2): 2015 3 Occurrence of Indian Peafowl (Pavo cristatus) in Parangipettai Coastal Area The Indian Peafowl (Pavo cristatus) also called Blue or Indian Peafowl (Pavo cristatus) Common Peafowl, is the largest of the pheasants. It was justifiably declared as the National Bird of India in 1963 due to its 'flagship' value founded on its glorious position in mythology and its widespread distribution and grandeur. Male peafowls are called peacocks, females as peahens and the young ones as peachicks. Each fan feather has an eyespot called an “ocellus”. With its long feathers, the male peafowl is one of the largest flying birds in the world. Indian peafowl ranges through eastern Pakistan through India, and from the Himalayas Source: http://ibc.lynxeds.com/photo/indian-peafowl-pavo-cristatus/male-standing-ground south to Sri Lanka. It is a bird of scrub-jungles and forest edges, showing affinity to moist and dry deciduous and semiarid biomes. It is also found in agriculture fields, along streams with good vegetation and close to human habitations in a semi-feral condition. It roosts on trees and also uses tall buildings where trees are scarce. It eats seeds, grains, berries, insects, crustaceans, small reptiles, small mammals and cultivated crops. It is likely that the availability of such food items in the above habitats partly explains the relatively high abundance of this species in semi arid and food plains. Now its occurrence has extended to the coastal and mangrove regions in Puducherry and Muthupettai. It has also been sighted in Parangipettai coastal region where an artificially developed mangrove forest, aquaculture farms and salt pans are there. Mangrove swamps function as the feeding ground for wading birds with high food resources such as fishes, crabs, insects and other molluscs and invertebrates in the sediments. Its survival strategies in coastal area are worth studying. The Indian Peafowl is listed as species of Least Concern in the Red List of International Union for Conservation of Nature. Deep-sea dragonfish (Stomiidae) Deep-Sea Dragonfish The deep-sea dragonfish (Stomiidae) is also called the barbelled dragonfish. It uses its fang-like teeth to grab prey in the deep-sea environment. Like other deep-sea organisms, dragonfish has bioluminescent photophores and other adaptations that allow it live at extreme depths. Source: http://ocean.si.edu/ocean-photos/deep-seadragonfish 4 Seshaiyana, 23(2): 2015 Eco-Sensitive Zone Tag for Bhitarkanika Villages The Union Ministry of Environment, Forest and Climate Change recently declared 192 villages around the Bhitarkanika National Park and the Gahirmatha Marine Sanctuary in Kendrapada district as eco-sensitive zone (ESZ). The ESZ status aims at preventing ecological damage caused due to developmental activities around the Bhitarkanika, touted as the India's fourth largest mangrove forest in India, and Gahirmatha beach, the world's 'largest rookery' of Olive Ridley sea turtles. The union government on October 21, 2014 issued a draft notification, identifying the ESZ, covering 192 villages within two-km radius of Bhitarkanika and invited suggestions and objections from the locals within two months. Many villagers and environmentalists submitted their suggestions and objections which were taken into consideration by the Centre. The guidelines issued include a broad list of activities that could be allowed, promoted and regulated. As per the guidelines, activities such as commercial mining, setting up of saw mills and industries, causing pollution, commercial use of firewood and setting up of major hydro-power projects are prohibited in such areas. The guidelines also prohibit activities like flying over the protected areas in an aircraft or hot air balloon and discharge of effluents and solid waste to natural water bodies or terrestrial areas. Felling of trees, drastic change in agriculture systems, commercial use of natural water resources and setting up of hotels and resorts are the activities to be regulated in the areas. Activities permitted in the areas include ongoing agriculture and horticulture practices by local communities, rainwater harvesting, organic farming, adoption of green technology and use of renewable energy sources. Bhitarkanika has 82 species of mangroves including many sub-species. It is a unique ecosystem, criss-crossed by a network of rivers and creeks which are infested with more than 1,600 crocodiles. Source: http://timesofindia.indiatimes .com/city/bhubaneswar/Eco-sensitive-zone-tag-forBhitarkanika-villages/articleshow/48184474.cms Bhitarkanika-mangroves Southern Elephant Seal in Gold Harbour, South Georgia – the Largest Seal on Earth The largest of all seal species, the southern elephant seal (Mirounga leonina) is found in the chilly Antarctic and Subantarctic waters. The male seals dive as deep as 1,430 meters (over 4,600 feet) and stay at that depth for up to two hours. The southern elephant seal is a truly restrained behemoth. Males can grow five times larger than females, up to 5,000 pounds. The above elephant seal may look fierce, but it is simply yawning over and over in the wave-wash. Source: http://ocean.si.edu/ocean-photos/southernelephant-seal-gold-harbour-south-georgia Elephant seal (Mirounga leonina) Seshaiyana, 23(2): 2015 5 Developing El Niño Could be the Strongest on Record A strong El Niño signaled by the periodic warming of ocean surface temperatures in the equatorial Pacific can lead to heavy rain in parts of North America and drier than normal conditions in Australia, Indonesia and parts of India. National Oceanic and Atmospheric Administration (NOAA) of US says that there is an 85% chance that the current El Niño will last through the first few months of next year (2016) with its strength peaking in November or December. How do scientists forecast an El Niño? Forecasters in the United States, Japan and Australia monitor sea surface temperatures in the Pacific, paying particular attention to a region called Niño 3.4 in the eastern equatorial Pacific. They also track water temperatures below the ocean surface and the air pressure above, then feed this information into forecast models. If ocean-surface temperatures in the Niño-3.4 region are between 0.5 and 1 °C above average during Elevated ocean surface temperatures in the eastern Pacific Ocean are a sign of El Niño How does an El Niño form? The weather pattern is the product of a complex dance between sea surface temperatures and atmospheric conditions. Normally, trade winds from the east drive cold water from the depths of the eastern Pacific Ocean to the surface. But sometimes those winds weaken, causing the ocean surface to warm and heat the air above it. That warm air rises and moves north and south from the equator, altering the high-altitude air currents along which storms tend to travel. 6 a three-month window, NOAA declares a weak El Niño. Forecasters label an El Niño as strong if the temperature level exceeds the average by 1.5 °C. NOAA projects that the current event could produce temperatures that are 2 °C higher than average, or more. For comparison, the strongest El Niño on record occurred in 1997–98 and produced temperatures 2.3 °C above average. What makes this El Niño different? It started unusually early in March instead of in June. This could be because warm waters left over Seshaiyana, 23(2): 2015 from last year's weak El Niño gave it a head start, according to the chief forecaster at the International Research Institute for Climate and Society at Columbia University in Palisades, New York. And this would be the second El Niño year in a row, following the weak El Niño that developed late last year. A similar El Niño double-header happened between 1986 and 1988, but forecasters predict that the current El Niño will become stronger than either of those two events. What effects might El Niño have elsewhere? El Niño is associated with higher atmospheric pressure in the western Pacific, which tends to produce sunny, dry weather in parts of Australia and Indonesia. The effects can spread all the way to India which has experienced a relatively dry June and July. They are having a bad monsoon in India. Source: http://www.nature.com/news/ developing-el-ni%C3%B1o-could-be-strongest-onrecord-1.18184 Mangrove Course in India 15 International Course on “Mangrove Biodiversity and Ecosystems” th Centre of Advanced Study in Marine Biology, Annamalai University, India (Nov. 23 – Dec. 7, 2015) Closing date for applications is September 5, 2015. Website: http://inweh.unu.edu/training/mangrove-course-in-india/ Overview Since 2004, UNU-INWEH has been supporting this annual two week training course in collaboration with Annamalai University, India, where it is organized and held. Teaching primarily focuses on mangrove ecosystems while maintaining an integrated approach on coastal ecosystem management. Objectives The course aims to build the capacity of professionals and institutions in developing countries to undertake monitoring, research and conservation of mangrove forests. This is achieved through training in the scientific methodology and teaching of latest research work on related subjects. A secondary objective is to create a network of professionals working with mangroves. UNU Fellowships A limited number of fellowships are available to qualified candidates from developing countries only. These fellowships will be granted on a competitive basis and will cover all expenses, including economy excursion airfares via the most direct route for candidates from outside India. Candidates from India will be reimbursed for travel via the most direct route. In order to apply for a fellowship, please complete the section called 'Justification for UNU Fellowship'. ITTO Fellowship Programme Applicants may apply for funding via The International Tropical Timber Organization (ITTO) Fellowship Programme. Please note that this is a 2 week training course so requests should reflect realistic expenses for travel, accommodation and allowance. Application forms can be sent via email or by sending hard copies by September, 5, 2015 to: Prof. Dr. K. Kathiresan, Director & Dean, CAS in Marine Biology, Annamalai University, Parangipettai 608 502, Tamil Nadu, India Telephone: 91-4144-43223 (Office), 238419 (Residence); Mobile: 91 -9442068003 E-mail: [email protected]; [email protected] Seshaiyana, 23(2): 2015 7 Travelling Fish Market in Pulicat Lagoon 200 fishing boats in Annamalaicheri, 20 are employed for this purpose. One fisherman who was interviewed in the high water told his group has sold everything it caught. He rushed again for fishing telling as vendors may arrive anytime they have to catch more fishes. Source: http://www.thehindu.com/features/ metroplus/the-travelling-fish-market-on-pulicatlake/article7464633.ece Sustainability: Do Not Waste Bycatch Travelling fish market In the Pulicat lagoon where flamingoes impervious to their surroundings march on contended on the silver-grey expanse of shallow waters, the travelling fish market unlike in any other habitat is also a unique thing. Fibre boats serve as mobile fish markets where fishes caught are kept in heaps. Two varieties of fishes such as Madavai (mullet) and Oran (rabbit fish) which are caught more here are marketed. Fish vendors from the nearby village hire a boat at Annamalaicheri and come shopping here for sea food. They sell these fishes wholesale at the market back home. Most of those who come for shopping here carry their own measuring, scales and weighing stones. It is called the 'maal tharasu', which consists of fishing net and a metal twine. Oran was sold for Rs.150 a kilogram on the day of observation. Within 20 minutes, the entire catch gets sold out. Here the freshest fishes are sold. No ice is used for storing. The taste therefore is superior. The fishing goes on throughout the day. The vendors come regularly and the catches are sold to them within minutes. All the transactions happen on the water — it's common to see men scribbling accounts on their notebooks and counting cash, as their boatmen steer them home on the waters of Pulicat. The leftovers are sold in the villages of fishermen or taken home for their own use. The concept of a mobile fish market has been in existence for several years in the region. Locals say that of the 8 Every year, some 6 million to 8 million tonnes of waste crab, shrimp and lobster shells are produced globally — about 1.5 million tonnes in the Southeast Asia alone. While 75% of the weight of a tuna fish can be extracted as fillets, meat accounts for only around 40% of a crab's mass. In developing countries, waste shells are often just dumped in landfill or the sea. In developed countries, disposal can be costly — up to US$150 per tonne in Australia for example. Dried shrimp shells are valued at a mere $100–120 per tonne. They can be ground down and the powder is used as an animal-feed supplement, bait or fertilizer, as well as in chitin production. Crustacean shells have 20–40% protein, 20–50% calcium carbonate and 15–40% chitin. What could these parts be used for? Shell refinery In the next five years, a multimillion-dollar project should be launched to establish the first processing pipeline using new technology. The Seshaiyana, 23(2): 2015 project should be supported by governments of nations rich in shell waste, and executed by researchers with complementary expertise, covering catalysis, materials science and engineering, food science and life-cycle assessment. Companies including producers and traders of shellfish, those associated with bio-commodities and biomaterials and others promoting renewable materials should reassess the potential markets of an environmentally friendly and profitable waste-shell refinery and engage with research to commercialize emerging technologies. In the next decade, stringent regulations should be implemented on the disposal of waste shells, while providing incentives for companies who use them. Source: http://www.nature.com/news/ sustainability-don-t-waste-seafood-waste-1.18149 Discarded bycatch-the crustaceans Building Opportunities for Fisherwomen in Tamil Nadu: The Power of Microfinancing Credit: © vlad61_61 / Fotolia Fisherwomen at work in fish landing centre Up to 87% of the poorest households in India do not have access to credit; 380 million are in need of microfinance services. Unequal education opportunities and access to business prospects have resulted in stunted economic security, particularly amongst women in coastal communities. This is where Small Grant Facility projects in India, under the Mangrove for the Future initiative (implemented by IUCN) are making a difference. Source: https://www.mangrovesforthefuture.org/news-and-media/news/india/buildingopportunities-for-fisher-women-in-tamil-nadu-the-power-of-micro-financing/#sthash.mkm5jhCs.dpuf Seshaiyana, 23(1): 2015 9 Seshaiyana, 23(1): 2015 (ISSN 0971-8656) Rising to the Challenge of Whale Shark Conservation Marking a significant start to whale shark (Rhincodon typus) conservation in Maharashtra, the Mangrove Cell, Forest Department of Maharashtra a n d I U C N I n d i a collaboratively organised a stakeholder workshop for the development of a m a n a g e m e n t a n d conservation plan for whale Rhincodon typus sharks in Maharashtra. This is the first of its kind for a marine species in the state. The workshop was held in Mumbai on 30 May 2015, and brought together conservation experts, industries, community leaders of fishermen and Government representatives. Source: https://www.mangrovesforthefuture.org/news-and-media/news/india/2015/rising-to-thechallenge-of-whale-shark-conservation/#sthash.B16gU66u.dpuf Coastal Cleanup Day The coastal cleanup day (19.9.2015) was organized in our ENVIS Centre on 21.9.2015. The ENVIS staff, faculty members, non-teaching staff, research scholars and students of Centre of Advanced Study in Marine Biology numbering at about 100 participated in this cleanup day and cleaned the nearby fish landing Centre (Annankovil, Parangipettai). They collected more than 270 kg of solid waste including plastics and polythene materials.
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