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Coral Reefs: Rainforests of Our Oceans

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Coral Reefs: Rainforests of Our Oceans Coral Reefs Rainforests of the Oceans Produced by Mangroves for the Future (MFF) India B-88, Neeti Bagh, New Delhi – 110 049 with financial support of Danida, Norad and Sida © 2013. International Union for Conservation of Nature and Natural Resources. ISBN 978-2-8317-1594-0 Citation: Anonymous (2013). Coral Reefs: Rainforests of the Oceans. MFF (India), IUCN India, New Delhi, 32 pp All rights reserved. No part of this publication may be reproduced in any form or by any means without the prior permission of the IUCN and MFF. The designation of geographical entities in this report, and presentation of the material, do not imply the expression of any opinion whatsoever on the part of International Union for Conservation of Nature and Natural Resources (IUCN) or Mangroves for the Future (MFF) or Ministry of Environment and Forests (MoEF) concerning the legal status of any country, territory, or area, or of its authorities, or concerning the delimitation of its frontiers or boundaries. The views expressed in this publication do not necessarily reflect those of IUCN or the MFF Initiative, nor does citing of trade names or commercial processes constitute endorsement. Design & Project Execution by Aravali Foundation for Education, New Delhi Content Planning & Creative Direction: Manoi Dabas Graphic Design/Pre-Production: Pramod Jha Content and Image Research: Shubhra Dabas and Nisha D’Souza Technical Review and Inputs: N M Ishwar, Nisha D’Souza and J R Bhatt Cover Photograph: Dhritiman Mukharjee First published in 2013 by MFF (India) For copies, write to : [email protected] FOREWORD I am pleased that the Mangrove for the Future (MFF) is bringing out this illustrative publication on the Coral Reef ecosystems which are a harbinger of coastal and marine biodiversity. The book is aptly titled as coral reefs are akin to tropical rainforests and they often support even greater biodiversity than tropical rainforests. India has four major reef ecosystems, including the Gulf of Mannar which is a designated Biosphere reserve under the UNESCO's Man and the Biosphere Programme. The illustrative publication provides useful information aided by high quality photographs on the diversity and splendour of these ecosystems. The book also describes the various threats that they face and the various international and national initiatives in place for addressing the long-term conservation of these ecosystems. It gives me immense pleasure to present the book during the UN decade on Biodiversity 2011-2020 as well as India's presidency following the hosting of the Eleventh Conference of Partiesto the Convention on Biological Diversity in October 2012 at Hyderabad. Corals and Coral reefs of our country enjoy legal protection. They are recognized as Schedule-I animals under the ambit of Wildlife Protection Act (1972). There is a Coastal Regulation Zone Notification 2011 which calls for protection of ecologically sensitive areas like coral reefs. Residuary issues not addressed by this notification can be taken care of through subordinate legislation under the Environment Protection Act (1986). I am sure that this publication will aid in improving the awareness levels among our children and youth on these living monuments. I congratulate all those who were involved in the preparation of the book. Dr. V. Rajagopalan Acknowledgements The marine realm is far larger than the terrestrial realm; the Pacific Ocean alone would be able to accommodate all the continents and have enough space for a second India! Marine and coastal ecosystems, like all ecosystems, are intricate webs of complex interactions among macro and microscopic species of plants, animals and fungi that depend on each other to survive. Over and above being sources of rich biodiversity, these ecosystems provide integral benefits to mankind. Mangroves for the Future (MFF) India, through this series of publications, intends to pique the curiosity and increase awareness amongst youth on marine and coastal ecosystems and serve as an educational resource material in classrooms in India and around the world. We would like to thank the Ministry of Environment and Forests, Government of India and the National Coordination Body (NCB) India for their support and guidance. Thanks to Deepak Apte, Digant Desai and Dhritiman Mukharjee for generously sharing photographs in gratis. We also would like to thank T S Nayar, Kartik Shanker, R Jayabaskaran, K Kathiresan, K Sivakumar, Ramamoorthy, V Vivekandan, Arjan Rajasuriya, D S Jayakodi and Rudolf Hermes for their scientific inputs. Contents Magnificent Coral Reefs Living monuments ������������������������������6 Expansive Coral Reefs Splendid spread ������������������������������������ 8 India‘s Coral Reefs Necklace of diversity ������������������������� 10 Coral Reef Plants Small yet significant ������������������������ 12 Coral Reef Animals Awesome diversity...............................14 Bountiful Coral Reefs How they serve ������������������������������������� 20 Dying Coral Reefs What’s killing them ���������������������������22 Conserving Coral Reefs International efforts ���������������������������24 Rooting for Coral Reefs No time to lose �������������������������������������26 Coral Wizard ��������������������������������������� 28 Glossary............................................... 31 Hawksbill Turtle Eretmochelys imbricata Coral Reefs Rainforests of the Oceans Magnificent Coral Reefs Living monuments Coral reefs are one of the largest and most diverse ecosystems on earth. A coral reef may look like a collection of rocks and boulders but in reality it is a colony of tiny invertebrates called coral polyps. Corals are extremely ancient animals that evolved into their modern reef building forms over millions of years. Coral Polyps Small Size, Huge Task There are hard (stony) corals and there are soft corals. But it is the hard corals that make a coral reef. Hard corals have skeletons made of calcium carbonate (limestone) secreted by the polyp. Each polyp is an individual Tentacles organism that begins life as a tiny free swimming larva but ultimately Mouth settles, never to move again, on Throat a hard surface (normally skeletal remains of dead corals), and form a Stomach coral colony. These colonies together form a coral reef. Hard Base Polyps have a ring of stinging cells called nematocysts to help them hunt small prey. Hard Coral Polyp Fringing Reef Cross-section Fringing Reefs grow close to the shoreline of volcanic islands and extend towards the sea as a Useful Weblinks platform. Fringing reefs are the most common reef animals.nationalgeographic.co.in type and can take 100,000 years to form. 6 coral-reef-info.com Clark’s Anemone Fish Coral Reefs Rainforests of the Oceans Amphiprion clarkii Like all things grand and magnificent, coral reefs also took a long time, a very long time, to be what they are today in terms of their grandeur as well as beauty. Primitive ancestors of coral reefs formed in the seas about 400-500 million years ago, much before life emerged on land. And they have not stopped building since then. Aerial view of Great Barrier Reef, Queensland, Australia Coral polyps are related to jellyfish and anemones. They all belong to the animal group known as Cnidarians It was none other than Charles Darwin, who also gave us the theory “survival of the fittest”, who first classified coral reef formations based on observations during his voyages. His classification, according to the shape and size of coral reefs, still holds good. Photo : Peter Adams/gettyimages Land Reef Barrier Reef Atoll Barrier Reefs grow parallel to the shoreline and Atolls are reefs that grow around islands, which develop due to the subsiding of islands around gradually sink into the sea over centuries due to which fringing reefs grow. They are separated volcanic activity leaving the reef behind. Atolls from the mainland by a deep lagoon. can take up to 30 million years to form. 7 Redfin Butterfly Fish Chaetodon trifasciatus Coral Reefs Rainforests of the Oceans Expansive Coral Reefs Splendid spread Although distributed across 100 countries worldwide and vital for coastal protection, tourism and marinelife, including fisheries, coral reefs occupy an area of about 284,300 km2. This is less than 0.2% of the total area under oceans. Yet coral reefs support about 25% of all marine species. 5 4 1 CORALS FUSSY ABOUT HABITAT Atlantic Ocean Indian Ocean Very sensitive to temperature, reef forming corals thrive best in ocean waters that average around 27-28oC. No wonder, most of the world’s large coral reef formations are found in the warm oceans of the Southern Ocean tropical belt. Apart from a Warm Water Coral Reefs Of The World stable seawater salinity (34- 36 psu), corals also need abundant sunlight and prefer clear and shallow waters, narmally upto 50 m depth. Coelacanths Photo : Peter Scoone/gettyimages were thought to have gone extinct with the dinosaurs. Rediscovered in 1938, these “living fossils” have only two known species. One of them, Useful Weblinks Latimeria menadoensis is found only in the Coral Triangle. geography.about.com | iucn.org 8 Long-jawed Squirrel Fish Coral Reefs Rainforests of the Oceans Clark’sSargocentron Anemone spiniferum Fish France, though located Cold water corals have been much outside the tropical found in temperate oceans belt, comes in fourth (after at depths upto 1,000 m, in Indonesia, Australia and temperatures as low as 4°C! Philippines) with 14,280 km2 Over 4,200 species of cold water of reefs located in its tropical
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